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Mitsubishi Electric HP120TNU-A Service Handbook

R410a
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  Summary of Contents for Mitsubishi Electric HP120TNU-A

  • Page 2: Safety Precautions

    Safety Precautions Please read the following safety precautions carefully before installing the unit to ensure safety. Indicates a risk of death or serious injury. Indicates a risk of serious injury or structural damage. Make sure that this manual is passed on to the end user to retain for future reference. Retain this manual for future reference.
  • Page 3 Always replace a fuse with one with the cor- To reduce the risk of electric shock, smoke, rect current rating. The use of improperly and fire due to infiltration of dust and water, rated fuses or a substitution of fuses with properly install all required covers and pan- steel or copper wire may result in bursting, els on the terminal box and control box.
  • Page 4 To reduce the risk of injury from coming in the dealer or qualified personnel. Only use contact with units, install units where they the parts specified by Mitsubishi Electric. are not accessible to people other than Installation by unauthorized personnel or maintenance personnel.
  • Page 5 To reduce the risk of drain water overflow, install the unit horizontally, using a level. [4] Piping Work Piping Work To reduce the risk of injury, including frost To reduce the risk of refrigerant leakage and bites, that may result from being blasted resultant oxygen deprivation, use the flare with refrigerant, use caution when operat- nut with holes that is supplied with the re-...
  • Page 6 To reduce the risk of injury or electric Use properly rated breakers and fuses (in- shock, switch off the main power before verter circuit breaker, local switch <switch + performing electrical work. fuse>, no-fuse breaker). The use of a break- er with a breaking capacity greater than the All electric work must be performed by a specified capacity may cause electric...
  • Page 7 To reduce the risk or malfunction, turn on To reduce the risk of the vacuum pump oil the power at least 12 hours before starting backflowing into the refrigerant cycle and operation, and leave the power turned on causing the refrigerant oil to deteriorate, throughout the operating season.
  • Page 8 Do not use a charging cylinder. The use of a charging cylinder will change the composi- tion of the refrigerant, compromising the unit's performance. Charge the system with an appropriate amount of refrigerant in the liquid phase. Refer to the relevant sections in the manu- als to calculate the appropriate amount of refrigerant to be charged.
  • Page 9 viii...
  • Page 10: Table Of Contents

    CONTENTS Chapter 1 Check Before Servicing Preparation for Piping Work........................1 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ....... 3 Working with Refrigerant Piping......................7 Precautions for Wiring ......................... 12 Cautionary notes on installation environment and maintenance............ 14 Chapter 2 Restrictions System Configurations ..........................
  • Page 11 CONTENTS Chapter 8 Troubleshooting Based on Observed Symptoms MA Remote Controller Problems ......................1 ME remote Controller Problems ......................5 Refrigerant Control Problems ......................10 Checking Transmission Waveform and for Electrical Noise Interference ........15 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ..18 Troubleshooting Solenoid Valve Problems ..................
  • Page 12 Chapter 1 Check Before Servicing Preparation for Piping Work ........................ 1 1-1-1 Read before Servicing ..........................1 1-1-2 Tool Preparation ............................. 2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil...... 3 1-2-1 Piping Materials ............................3 1-2-2 Storage of Piping Materials........................4 1-2-3 Pipe Processing ............................
  • Page 13 HWE18220_GB...
  • Page 14: Preparation For Piping Work

    [1-1 Preparation for Piping Work ] 1 Check Before Servicing Preparation for Piping Work 1-1-1 Read before Servicing 1. Check the type of refrigerant used in the system to be serviced. Refrigerant Type Multi air conditioner for building application CITY MULTI:R410A 2.
  • Page 15: Tool Preparation

    [1-1 Preparation for Piping Work ] 1-1-2 Tool Preparation Prepare the following tools and materials necessary for installing and servicing the unit. Tools for use with R410A (Adaptability of tools that are for use with R22 or R407C) 1. To be used exclusively with R410A (not to be used if used with R22 or R407C) Tools/Materials Notes Gauge Manifold...
  • Page 16: Handling And Characteristics Of Piping Materials, Refrigerant, And Refrigerant Oil

    [1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ] Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil 1-2-1 Piping Materials Do not use the existing piping! 1. Copper pipe materials Annealed Soft copper pipes (annealed copper pipes). They can easily be bent with hands. Drawn Hard copper pipes (straight pipes).
  • Page 17: Storage Of Piping Materials

    [1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ] 1-2-2 Storage of Piping Materials 1. Storage location Store the pipes to be used indoors. (Warehouse at site or owner's warehouse) If they are left outdoors, dust, dirt, or moisture may infiltrate and contaminate the pipe. 2.
  • Page 18: Characteristics Of The New And Conventional Refrigerants

    [1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ] 1-2-4 Characteristics of the New and Conventional Refrigerants 1. Chemical property As with R22, the new refrigerant (R410A) is low in toxicity and chemically stable nonflammable refrigerant. However, because the specific gravity of vapor refrigerant is greater than that of air, leaked refrigerant in a closed room will accumulate at the bottom of the room and may cause hypoxia.
  • Page 19: Refrigerant Oil

    [1-2 Handling and Characteristics of Piping Materials, Refrigerant, and Refrigerant Oil ] 1-2-5 Refrigerant Oil 1. Refrigerating machine oil in the HFC refrigerant system HFC type refrigerants use a refrigerating machine oil different from that used in the R22 system. Note that the ester oil used in the system has properties that are different from commercially available ester oil.
  • Page 20: Working With Refrigerant Piping

    [1-3 Working with Refrigerant Piping ] Working with Refrigerant Piping 1-3-1 Pipe Brazing No changes have been made in the brazing procedures. Perform brazing with special care to keep foreign objects (such as oxide scale, water, and dust) out of the refrigerant system. Example: Inside the brazed connection Use of no inert gas during brazing Use of inert gas during brazing...
  • Page 21: Air Tightness Test

    [1-3 Working with Refrigerant Piping ] 1-3-2 Air Tightness Test No changes have been made in the detection method. Note that a refrigerant leak detector for R22 will not detect an R410A leak. Halide torch R22 leakage detector 1. Items to be strictly observed Pressurize the equipment with nitrogen up to the design pressure (4.15MPa[601psi]), and then judge the equipment's air tight- ness, taking temperature variations into account.
  • Page 22: Vacuum Drying

    [1-3 Working with Refrigerant Piping ] 1-3-3 Vacuum Drying (Photo1) 15010H (Photo2) 14010 Recommended vacuum gauge: ROBINAIR 14010 Thermistor Vacuum Gauge 1. Vacuum pump with a reverse-flow check valve (Photo1) To prevent the vacuum pump oil from flowing into the refrigerant circuit during power OFF or power failure, use a vacuum pump with a reverse-flow check valve.
  • Page 23 [1-3 Working with Refrigerant Piping ] 7. Triple Evacuation The method below can also be used to evacuate the system. Evacuate the system to 4,000 microns from both service valves. System manifold gauges must not be used to measure vac- uum.
  • Page 24: Refrigerant Charging

    [1-3 Working with Refrigerant Piping ] 1-3-4 Refrigerant Charging Cylinder with a siphon Cylinder without a siphon Cylin- Cylin- Cylinder color R410A is pink. Refrigerant charging in the liquid state Valve Valve liquid liquid 1. Reasons R410A is a pseudo-azeotropic HFC blend (boiling point R32=-52°C[-62°F], R125=-49°C[-52°F]) and can almost be handled the same way as a single refrigerant, such as R22.
  • Page 25: Precautions For Wiring

    [1-4 Precautions for Wiring ] Precautions for Wiring Control boxes house high-voltage and high-temperature electrical parts. They may still remain energized or hot after the power is turned off. When opening or closing the front cover of the control box, keep out of contact with the internal parts. Before inspecting the inside of the control box, turn off the power, leave the unit turned off for at least 10 minutes, and check that the voltage across pins 1 and 5 of connector RYPN has dropped to 20 VDC or less.
  • Page 26 [1-4 Precautions for Wiring ] 2) Check the wires are securely fastened to the screw terminals. Screw the screws straight down so as not to damage the screw threads. Hold the two round terminals back to back to ensure that the screw will screw down straight. After tightening the screw, mark a line through the screw head, washer, and terminals with a permanent marker.
  • Page 27: Cautionary Notes On Installation Environment And Maintenance

    [1-5 Cautionary notes on installation environment and maintenance ] Cautionary notes on installation environment and maintenance Salt-resistant unit is resistant to salt corrosion, but not salt-proof. Please note the following when installing and maintaining outdoor units in marine atmosphere. 1) Install the salt-resistant unit out of direct exposure to sea breeze, and minimize the exposure to salt water mist. 2) Avoid installing a sun shade over the outdoor unit, so that rain will wash away salt deposits off the unit.
  • Page 28: Chapter 2 Restrictions

    Chapter 2 Restrictions System Configurations......................... 1 Types and Maximum Allowable Length of Cables................2 Switch Settings ............................. 4 M-NET Address Settings ........................5 2-4-1 Address Settings List ..........................5 2-4-2 Outdoor Unit Power Jumper Connector Connection................6 2-4-3 Outdoor Unit Centralized Controller Switch Setting ................6 2-4-4 Room Temperature Detection Position Selection ...................
  • Page 29 HWE18220_GB...
  • Page 30: System Configurations

    [2-1 System Configurations ] 2 Restrictions System Configurations 1. Table of compatible indoor units The table below summarizes the types of indoor units that are compatible with different types of outdoor units. (1) Standard combinations Outdoor units Composing units Maximum total ca- Maximum num- Types of connectable in- pacity of connect-...
  • Page 31: Types And Maximum Allowable Length Of Cables

    [2-2 Types and Maximum Allowable Length of Cables ] Types and Maximum Allowable Length of Cables 1. Wiring work (1) Notes 1) Have all electrical work performed by an authorized electrician according to the local regulations and instructions in this man- ual.
  • Page 32 [2-2 Types and Maximum Allowable Length of Cables ] (2) Control wiring Different types of control wiring are used for different systems. Before performing wiring work, refer to the following page(s). [2-7 Example System with an MA Remote Controller] [2-8 Example System with an ME Remote Controller] [2-9 Example System with an MA and an ME Remote Controller] Types and maximum allowable length of cables Control lines are categorized into 2 types: transmission line and remote controller line.
  • Page 33: Switch Settings

    [2-3 Switch Settings ] Switch Settings 1. Switch setting The necessary switch settings depend on system configuration. Before performing wiring work, refer to the following page(s). [2-7 Example System with an MA Remote Controller] [2-8 Example System with an ME Remote Controller] [2-9 Example System with an MA and an ME Remote Controller] If the switch settings are changed while the unit is being powered, those changes will not take effect, and the unit will not function properly.
  • Page 34: M-Net Address Settings

    [2-4 M-NET Address Settings ] M-NET Address Settings 2-4-1 Address Settings List 1. M-NET Address settings (1) Address settings table The need for address settings and the range of address setting depend on the configuration of the system. Unit or controller Sym- Address Setting method...
  • Page 35: Outdoor Unit Power Jumper Connector Connection

    [2-4 M-NET Address Settings ] Unit or controller Sym- Address Setting method Factory setting address range setting System con- Group remote control- 201 to 250 Assign an address that equals the sum of the smallest group troller number of the group to be controlled and 200. System remote con- Assign an arbitrary but unique address within the range listed troller...
  • Page 36: Room Temperature Detection Position Selection

    [2-4 M-NET Address Settings ] 2-4-4 Room Temperature Detection Position Selection To stop the fan during heating Thermo-OFF (SW1-7 and 1-8 on the indoor units to be set to ON), use the built-in thermistor on the remote controller or an optional thermistor. 1) To use the built-in sensor on the remote controller, set the SW1-1 to ON.
  • Page 37: Various Control Methods Using The Signal Input/Output Connector On Outdoor Unit

    [2-4 M-NET Address Settings ] 2-4-7 Various Control Methods Using the Signal Input/Output Connector on Outdoor Unit (1) Various connection options Terminal Type Usage Function to be Option used Input Prohibiting cooling/heating operation (thermo OFF) by an external DEMAND (level) CN3D Adapter for input to the outdoor unit.
  • Page 38 [2-4 M-NET Address Settings ] (2) Example of wiring connection CAUTION 1) Wiring should be covered by insulation tube with supplementary insulation. 2) Use relays or switches with IEC or equivalent standard. 3) The electric strength between accessible parts and control circuit should have 2750V or more. (1) CN51 (2) CN3S Outdoor unit...
  • Page 39 [2-4 M-NET Address Settings ] (5) CN3K External input Outdoor unit Relay circuit adapter control board CN3K Preparations in the field Maximum cable length is 10m X : Energy-saving mode command X : Relay Contact rating voltage >= DC15V Contact rating current >= 0.1A Minimum applicable load =<...
  • Page 40: Demand Control Overview

    [2-5 Demand Control Overview ] Demand Control Overview (1) General outline of control Demand control is performed by using the external signal input to the 1-2 and 1-3 pins of CN3D on the outdoor units (OC and OS). Between 2 and 8 steps of demand control is possible by setting Dip SW6-8 on the outdoor units (OC and OS). Dip SW6-8 Demand control switch Input to CN3D*...
  • Page 41: System Connection Example

    [2-6 System Connection Example ] System Connection Example Examples of typical system connection are shown below. Refer to the Installation Manual that came with each device or controller for details. (1) An example of a system to which an MA remote controller is connected System Address start up for in- Connection to the system controller...
  • Page 42: Example System With An Ma Remote Controller

    [2-7 Example System with an MA Remote Controller ] Example System with an MA Remote Controller 2-7-1 Single Refrigerant System (Automatic Indoor/Outdoor Address Startup) (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male Group Group connector on...
  • Page 43 [2-7 Example System with an MA Remote Controller ] (4) Wiring method Set one of the MA remote controllers as a sub controller. (Refer to the Instruction Manual for the MA remote con- 1) Indoor/outdoor transmission line troller for the setting method.) Daisy-chain terminals M1 and M2 of the terminal block Group operation of indoor units for indoor-outdoor transmission line (TB3) on the outdoor...
  • Page 44: Single Refrigerant System With Two Or More Lossnay Units

    [2-7 Example System with an MA Remote Controller ] 2-7-2 Single Refrigerant System with Two or More LOSSNAY Units (1) Sample control wiring Interlock operation with the ventilation unit Leave the male Leave the male Group Group connector on connector on CN41 as it is.
  • Page 45 [2-7 Example System with an MA Remote Controller ] shielded cable. (4) Wiring method 2) Transmission line for centralized control 1) Indoor/outdoor transmission line No connection is required. Daisy-chain terminals M1 and M2 of the terminal block 3) MA remote controller wiring for indoor-outdoor transmission line (TB3) on the outdoor Same as 2-7-1 units (OC and OS), of the terminal block for indoor-out-...
  • Page 46: Grouped Operation Of Units In Separate Refrigerant Circuits

    [2-7 Example System with an MA Remote Controller ] 2-7-3 Grouped Operation of Units in Separate Refrigerant Circuits (1) Sample control wiring Interlock operation with the ventilation unit Move the male connector Leave the male from CN41 to CN40. Group Group Group connector on...
  • Page 47 [2-7 Example System with an MA Remote Controller ] problem with the outdoor unit whose power jumper was (4) Wiring method moved from CN41 to CN40, central control is not possible, even if TB7's are daisy-chained.) 1) Indoor/outdoor transmission line c) When connecting TB7, only commence after checking that Same as 2-7-2 the voltage is below 20 VDC.
  • Page 48: System With A Connection Of System Controller To Centralized Control Transmission Line

    [2-7 Example System with an MA Remote Controller ] 2-7-4 System with a Connection of System Controller to Centralized Control Transmission Line (1) Sample control wiring An example of a system in which a system controller is connected to the transmission cable for the centralized control system and the power is supplied from the outdoor unit Interlock operation with the ventilation unit...
  • Page 49 [2-7 Example System with an MA Remote Controller ] problem with the outdoor unit whose power jumper was (4) Wiring method moved from CN41 to CN40, central control is not possible, even if TB7's are daisy-chained.) 1) Indoor/outdoor transmission line c) When connecting TB7, only commence after checking that Same as 2-7-2 the voltage is below 20 VDC.
  • Page 50: System With A Connection Of System Controller To Indoor-Outdoor Transmission Line

    [2-7 Example System with an MA Remote Controller ] 2-7-5 System with a Connection of System Controller to Indoor-Outdoor Transmission Line (1) Sample control wiring Interlock operation with the ventilation unit CN41 CN40 Replace Leave the male SW5-1 OFF ON connector on CN41 as it is.
  • Page 51 [2-7 Example System with an MA Remote Controller ] daisy-chained, connect the transmission line for the central control (4) Wiring method system to TB7 of the OC. (Note a).To maintain the central control even during an OC failure or a power failure, connect TB7 on OC 1) Indoor/outdoor transmission line and OS together.
  • Page 52: System With Multiple Bc Controllers

    [2-7 Example System with an MA Remote Controller ] 2-7-6 System with Multiple BC Controllers (1) Sample control wiring Leave the male Move the male connector connector on from CN41 to CN40 CN41 as it is. SW5-1 OFF ON Group Group Group Group...
  • Page 53 [2-7 Example System with an MA Remote Controller ] cuit are not daisy-chained, connect the transmission line (4) Wiring method for the central control system to TB7 of the OC. (Note 1) Indoor/outdoor transmission line a).To maintain the central control even during an OC fail- ure or a power failure, connect TB7 on OC and OS to- Daisy-chain terminals M1 and M2 of the terminal block gether.
  • Page 54 [2-7 Example System with an MA Remote Controller ] (5) Address setting method Pro- Fac- Address tory Unit or controller setting Setting method Notes set- range ting Indoor Main unit IC 01 to 50 Assign the smallest address to the main unit in the Port number setting is re- group.
  • Page 55: Example System With An Me Remote Controller

    [2-8 Example System with an ME Remote Controller ] Example System with an ME Remote Controller 2-8-1 System with a Connection of System Controller to Centralized Control Transmission Line (1) Sample control wiring Interlock operation with the ventilation unit Move the male connector Leave the male from CN41 to CN40.
  • Page 56 [2-8 Example System with an ME Remote Controller ] When 2 remote controllers are connected to the sys- (4) Wiring method 1) Indoor/outdoor transmission line Refer to the section on Switch Setting. Same as 2-7-2 Performing a group operation (including the group operation of units in different refrigerant circuits).
  • Page 57: Example System With An Ma And An Me Remote Controller

    [2-9 Example System with an MA and an ME Remote Controller ] Example System with an MA and an ME Remote Controller 2-9-1 System with a Connection of System Controller to Centralized Control Transmission Line (1) Sample control wiring Move the male connector Leave the male from CN41 to CN40.
  • Page 58 [2-9 Example System with an MA and an ME Remote Controller ] Shielded cable connection (3) Maximum allowable length Same as 2-7-2 1) Indoor/outdoor transmission line 2) Transmission line for centralized control Same as 2-7-3 Same as 2-7-4 2) Transmission line for centralized control Shielded cable connection Same as 2-7-4 Same as 2-7-4...
  • Page 59 [2-9 Example System with an MA and an ME Remote Controller ] (5) Address setting method Fac- Pro- dress tory Unit or controller Setting method Notes setting set- dures range ting Opera- Main 01 to Assign the smallest address to Assign an address smaller than that of the main unit in the group.
  • Page 60: 2-10 Restrictions On Refrigerant Pipes

    [2-10 Restrictions on Refrigerant Pipes ] 2-10 Restrictions on Refrigerant Pipes 2-10-1 Restrictions on Refrigerant Pipe Length (1) System that requires 16 BC controller ports or fewer <System with only the main BC controller or standard BC controller> Note1. No Header usable on PURY system. Note2.
  • Page 61 [2-10 Restrictions on Refrigerant Pipes ] (2) System that requires more than 16 BC controller ports or with multiple BC controllers <System with one outdoor unit> Note1. No Header usable on PURY system. Note2. Indoor unit sized P72-P96 should be connected to BC controller via Y shape joint CMY-R160-J1. Note3.
  • Page 62 [2-10 Restrictions on Refrigerant Pipes ] Piping length and height between IU and BC controller Height difference between the main BC controller Height difference between the main BC controller and indoor unit (m) and indoor unit (m) Height difference between Main BC controller Height difference between Main BC controller and farthest indoor unit (ft) and farthest indoor unit (ft)
  • Page 63 [2-10 Restrictions on Refrigerant Pipes ] (3) System that requires more than 16 BC controller ports or with multiple BC controllers <System with two outdoor units> Note1. No Header usable on PURY system. Note2. Indoor unit sized P72-P96 should be connected to BC controller via Y shape joint CMY-R160-J1. Joint CMY-R160-J1 Liquid side CMY-R160-J1 Note3.
  • Page 64 [2-10 Restrictions on Refrigerant Pipes ] Piping length and height between IU and BC controller Height difference between the main BC controller Height difference between the main BC controller and indoor unit (m) and indoor unit (m) Height difference between Main BC controller Height difference between Main BC controller and farthest indoor unit (ft) and farthest indoor unit (ft)
  • Page 65 [2-10 Restrictions on Refrigerant Pipes ] Total piping length restrictions(m) [PURY-HP72, 96TNU-A, PURY-HP72, 96YNU-A] [PURY-HP192TSNU-A, PURY-HP192YSNU-A] 1000 1000 90 100 110 90 100 110 Distance between outdoor unit and BC controller (m) Distance between outdoor unit and BC controller (m) [PURY-HP120, 144T(S)NU-A, PURY-HP120, 144Y(S)NU-A] [PURY-HP240TSNU-A, PURY-HP240YSNU-A] 1000...
  • Page 66 [2-10 Restrictions on Refrigerant Pipes ] Total piping length restrictions(ft.) [PURY-HP72, 96TNU-A, PURY-HP72, 96YNU-A] [PURY-HP192TSNU-A, PURY-HP192YSNU-A] 3000 2000 2500 1500 2000 1000 1500 1000 Distance between outdoor unit and BC controller (ft.) Distance between outdoor unit and BC controller (ft.) [PURY-HP120, 144T(S)NU-A, PURY-HP120, 144Y(S)NU-A] [PURY-HP240TSNU-A, PURY-HP240YSNU-A] 3000...
  • Page 67: Restrictions On Refrigerant Pipe Size

    [2-10 Restrictions on Refrigerant Pipes ] 2-10-2 Restrictions on Refrigerant Pipe Size (1) Between outdoor unit and BC controller (Part A) Unit : mm [inch] Outdoor units High-pressure pipe Low-pressure pipe HP72 ø15.88 [5/8"] ø19.05 [3/4"] HP96 ø22.2 [7/8"] ø19.05 [3/4"] HP120 HP144 ø28.58 [1-1/8"]...
  • Page 68: Bc Controller Connection Method

    [2-10 Restrictions on Refrigerant Pipes ] 2-10-3 BC Controller Connection Method (1) Size of the pipe that fits the standard BC controller ports HP72 - HP120 models Connection: Brazed connection To outdoor unit BC controller Branch joint (Model name:CMY-Y102S-G2) Junction pipe kit (Optional accessory) (Model name: CMY-R160-J1)
  • Page 69 [2-10 Restrictions on Refrigerant Pipes ] Be sure to have pipe expansion of indoor unit connecting port by Ⓐ cutting the piping at the cutting point which depends on the indoor unit capacity. Indoor unit connecting port Cutting point : ø9.52 (Liquid side) or ø15.88 (Gas side)    (Indoor unit model : bigger than P50) Cutting point : ø6.35 (Liquid side) or ø12.7 (Gas side) (Indoor unit model : P50 or smaller)
  • Page 70 [2-10 Restrictions on Refrigerant Pipes ] (2) Size of the pipe that fits the main BC controller ports HP72 - HP336 models High-pressure Connection: Brazed connection gas pipe Low-pressure main pipe Outdoor BC controller (main) Low-pressure controller Branch joint pipe unit gas pipe (sub)
  • Page 71 [2-10 Restrictions on Refrigerant Pipes ] The ports of the BC controller accommodates the pipes on P24-P54 models of indoor units. To connect other types of indoor units, follow the procedure below. Be sure to have pipe expansion of indoor unit connecting port by Ⓐ...
  • Page 72 [2-10 Restrictions on Refrigerant Pipes ] Unit : mm [inch] Outdoor units High-pressure side Low-pressure pipe Outdoor unit side HP72 ø15.88 [5/8"] (Brazed connection) ø19.05 [3/4"] (Brazed connection) HP96 ø22.2 [7/8"] (Brazed connection) ø19.05 [3/4"] (Brazed connection) HP120 HP144 ø28.58 [1-1/8"] (Brazed connection) ø22.2 [7/8"] (Brazed connection) HP192 HP240...
  • Page 73 [2-10 Restrictions on Refrigerant Pipes ] (3) Size of the pipe that fits the sub BC controller ports Branch joint (Model name:CMY-Y102S-G2) (Optional accessory) Connection: Brazed connection To Main BC controller Junction pipe kit BC controller (sub) (Model name: CMY-R160-J1) (Optional accessory) Indoor Indoor...
  • Page 74 [2-10 Restrictions on Refrigerant Pipes ] 3) To connect multiple indoor units to a port (or to a junction pipe) Maximum total capacity of connected indoor units: P54 or below (in a system with a junction pipe: P96 or below) Maximum number of connectable indoor units: 3 units Branch joint: Use CMY-Y102SS-G2, CMY-Y102LS-G2 (optional accessory).
  • Page 75: Outdoor Twinning Kit

    [2-10 Restrictions on Refrigerant Pipes ] 2-10-4 Outdoor Twinning Kit The following optional Outdoor Twinning Kit is needed to use to combine multiple refrigerant pipes. Refer to section [2-10 Restric- tions on Refrigerant Pipes] for the details of selecting a proper twinning kit. CMY-R100NCBK Unit: mm (in.) Note:...
  • Page 76: Chapter 3 Major Components, Their Functions And Refrigerant Circuits

    Chapter 3 Major Components, Their Functions and Refrigerant Circuits External Appearance and Refrigerant Circuit Components of Outdoor Unit........1 3-1-1 External Appearance of Outdoor Unit ..................... 1 3-1-2 Outdoor Unit Refrigerant Circuits......................2 Outdoor Unit Refrigerant Circuit Diagrams..................3 Functions of the Major Components of Outdoor Unit ............... 4 Functions of the Major Components of Indoor Unit ................
  • Page 77 HWE18220_GB...
  • Page 78: External Appearance And Refrigerant Circuit Components Of Outdoor Unit

    [3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ] 3 Major Components, Their Functions and Refrigerant Circuits External Appearance and Refrigerant Circuit Components of Outdoor Unit 3-1-1 External Appearance of Outdoor Unit PURY-HP72, HP96, HP120T(Y)NU-A Fan guard Fan guard Heat exchanger Heat exchanger Fin guard...
  • Page 79: Outdoor Unit Refrigerant Circuits

    [3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ] 3-1-2 Outdoor Unit Refrigerant Circuits PURY-HP72, HP96, HP120T(Y)NU-A Check valve (CV2a) Check valve Check valve (CV5a) (CV3a) Check valve (CV6a) Solenoid valve (SV1a) Accumulator High-pressure switch Low-pressure sensor (63H1) (63LS) High-pressure sensor (63HS1)
  • Page 80: Outdoor Unit Refrigerant Circuit Diagrams

    [3-2 Outdoor Unit Refrigerant Circuit Diagrams ] Outdoor Unit Refrigerant Circuit Diagrams (1) PURY-HP72 - HP120T/YNU-A HWE18220_GB chapter 3 -...
  • Page 81: Functions Of The Major Components Of Outdoor Unit

    [3-3 Functions of the Major Components of Outdoor Unit ] Functions of the Major Components of Outdoor Unit Part Symbols Notes Usage Specifications Check method name (functions) Com- Adjusts the amount of circulating HP72 model pressor (Comp1) refrigerant by adjusting the operat- Low-pressure shell scroll ing frequency based on the oper- compressor...
  • Page 82 [3-3 Functions of the Major Components of Outdoor Unit ] Part Symbols Notes Usage Specifications Check method name (functions) Thermis- Controls defrosting during heating Degrees Celsius Resistance check (Pipe operation = 15k temperature) = 3460 0/80 R = 15 3460 1) Detects outdoor air tempera- (Outdoor tem- ture...
  • Page 83 [3-3 Functions of the Major Components of Outdoor Unit ] Part Symbols Notes Usage Specifications Check method name (functions) Fan mo- FAN motor 1,2 Regulates the heat exchanger ca- (YNU) pacity by adjusting the operating HP72 - HP120 frequency and operating the pro- AC380 - 460V, 460W peller fan based on the operating (TNU)
  • Page 84: Functions Of The Major Components Of Indoor Unit

    [3-4 Functions of the Major Components of Indoor Unit ] Functions of the Major Components of Indoor Unit Part Symbol Notes Usage Specification Check method Name (functions) Linear 1) Adjusts superheat at the DC12V Continuity between expan- Opening of stepping motor white, red, and or- indoor heat exchanger sion valve...
  • Page 85: External Appearance And Refrigerant Circuit Components Of Bc Controller

    [3-5 External Appearance and Refrigerant Circuit Components of BC Controller ] External Appearance and Refrigerant Circuit Components of BC Controller 1. CMB-P NU-J1, JA1, KA1 (1) Front Liquid pipe (Indoor unit side) Low-pressure pipe (sub BC controller side) High-pressure pipe (sub BC controller side) Liquid pipe (sub BC controller side)
  • Page 86 [3-5 External Appearance and Refrigerant Circuit Components of BC Controller ] (3) Rear view <JA1 type> TH16 TH12 Gas/Liquid separator SVM1 Low-pressure pipe (outdoor unit side) High-pressure pipe (outdoor unit side) TH15 LEV3 SVM1b Tube in tube heat exchanger TH11 LEV4 LEV1 (4) Rear view <KA1 type>...
  • Page 87 [3-5 External Appearance and Refrigerant Circuit Components of BC Controller ] 2. CMB-P NU-KB1 (1) Front Liquid pipe (Indoor unit side) Gas pipe (Indoor unit side) (2) Rear view TH16 TH12 TH15 LEV3 - chapter 3 HWE18220_GB...
  • Page 88: Bc Controller Refrigerant Circuit Diagrams

    [3-6 BC Controller Refrigerant Circuit Diagrams ] BC Controller Refrigerant Circuit Diagrams (1) CMB-P104, 106, 108, 1012, P1016NU-J1 Solenoid valve block SVC/SVA/SVB Low-pressure Orifice pipe (outdoor unit side) TH15 LEV3 TH12 High-pressure HIC-B1 HIC-B2 pipe (outdoor unit side) Gas/Liquid TH11 separator TH16 HIC-A1 HIC-A2...
  • Page 89 [3-6 BC Controller Refrigerant Circuit Diagrams ] (3) CMB-P1016NU-KA1 (main) Solenoid valve block SVC/SVA/SVB Low-pressure Orifice pipe (outdoor Low-pressure unit side) pipe (sub BC controller side) TH15 High-pressure pipe (sub BC LEV4 TH12 controller side) LEV3 HIC-B High-pressure pipe (outdoor unit side) Gas/Liquid Liquid pipe...
  • Page 90: Functions Of The Major Components Of Bc Controller

    [3-7 Functions of the Major Components of BC Controller ] Functions of the Major Components of BC Controller (1) J type Symbols Part Part name Usage Specifications Check method (functions) code Pressure 1) Detects high pressure Pressure sensor (High pres- 2) LEV control 0~4.15 MPa [601psi] Vout 0.5~3.5V...
  • Page 91 [3-7 Functions of the Major Components of BC Controller ] (2) JA type Symbols Part Part name Usage Specifications Check method (functions) code Pressure 1) Detects high pressure Pressure sensor (High pres- 2) LEV control 0~4.15 MPa [601psi] Vout 0.5~3.5V sure side) 1 2 3 0.071V/0.098 MPa [14psi]...
  • Page 92 [3-7 Functions of the Major Components of BC Controller ] (3) KA type Symbols Part Part name Usage Specifications Check method (functions) code Pressure 1) Detects high pressure Pressure sensor (High pres- 2) LEV control 0~4.15 MPa [601psi] Vout 0.5~3.5V sure side) 1 2 3 0.071V/0.098 MPa [14psi]...
  • Page 93 [3-7 Functions of the Major Components of BC Controller ] (4) KB type Symbols Part Part name Usage Specifications Check method (functions) code Pressure 1) Detects intermediate Pressure sensor (Intermedi- pressure 0~4.15 MPa [601psi] Vout 0.5~3.5V ate pres- 2) LEV control 1 2 3 0.071V/0.098 MPa [14psi] sure)
  • Page 94: Chapter 4 Electrical Components And Wiring Diagrams

    Chapter 4 Electrical Components and Wiring Diagrams Outdoor Unit Circuit Board Arrangement................... 1 4-1-1 Outdoor Unit Control Box........................1 Outdoor Unit Circuit Board Components ................... 4 4-2-1 Control Board............................4 4-2-2 Power-supply board (PS Board) ......................5 4-2-3 Inverter Board (INV Board) ........................6 4-2-4 Fan Board ...............................
  • Page 95 HWE18220_GB...
  • Page 96: Outdoor Unit Circuit Board Arrangement

    [4-1 Outdoor Unit Circuit Board Arrangement ] 4 Electrical Components and Wiring Diagrams Outdoor Unit Circuit Board Arrangement 4-1-1 Outdoor Unit Control Box <HIGH VOLTAGE WARNING> Control box houses high-voltage parts. When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components.
  • Page 97 [4-1 Outdoor Unit Circuit Board Arrangement ] (1) YNU Fan board (right) Noise filter Fan board (left) Control board Capacitor board Fuse holder Power-supply terminal INV board block Connector RYPN (1 pin +, 5 pin -) DC reactor Transmission cable terminal (DCL) block (TB3, TB7) Cooling fan...
  • Page 98 [4-1 Outdoor Unit Circuit Board Arrangement ] (2) TNU Fan board (right) Noise filter Fan board (left) Control board Capacitor board Power-supply terminal block Connector RYPN (1 pin +, 5 pin -) Transmission cable terminal block (TB3, TB7) INV board DC reactor Cooling fan (DCL)
  • Page 99: Outdoor Unit Circuit Board Components

    [4-2 Outdoor Unit Circuit Board Components ] Outdoor Unit Circuit Board Components 4-2-1 Control Board CNPS CN600 CN603 9 VDC input Cooling fan control signal output CN4/4A/4B/4C Abbreviated name 5 VDC output Inverter reset signal output Serial communication Power-supply of connector color 12 VDC input signal output signal output...
  • Page 100: Power-Supply Board (Ps Board)

    [4-2 Outdoor Unit Circuit Board Components ] 4-2-2 Power-supply board (PS Board) CN100 L2-N Voltage input Zero-cross output Ground Ground Ground CNFG5 Ground CN300 Booster COMP gate voltage output Ground CNDC MAIN power-supply output 9 VDC output 13 VDC output LED1 Indoor unit system power supply...
  • Page 101: Inverter Board (Inv Board)

    [4-2 Outdoor Unit Circuit Board Components ] 4-2-3 Inverter Board (INV Board) (1) YNU CN-P, CN-N Connects to connector RYPN IGBT (rear) SC-L1 Input (L1) SC-P DCL terminal SC-L2 SC-P1 Input (L2) DCL terminal SC-L3 Input (L3) CNRY 12 VDC GND (Power-supply board) SC-U Inverter output (U)
  • Page 102 [4-2 Outdoor Unit Circuit Board Components ] (2) TNU LED1 Lit: Inverter operation Serial communication signal CNRY LED900 Signal input Blinking: Inverter error 12 VDC Lit: Relay drive power GND (MAIN circuit board) LED4 is supplied. Signal output Lit: Microcomputer is energized. (Power-supply Unlit: Relay drive power GND (MAIN circuit board)
  • Page 103: Fan Board

    [4-2 Outdoor Unit Circuit Board Components ] 4-2-4 Fan Board (1) YNU LED01 Lit: Inverter operation CNDCN Blinking: Inverter error LED04 Bus voltage input (N) Lit: Microcomputer in operation RSH03 Current detection resistor RSH02 Current detection resistor RSH01 Current detection resistor CN81 17 VDC input CNINV...
  • Page 104 [4-2 Outdoor Unit Circuit Board Components ] (2) TNU LED01 RSH03 CNDCN Lit: Inverter operation Current detection resistor Bus voltage input (N) Blinking: Inverter error RSH02 Current detection resistor RSH01 Current detection resistor CN81 17 VDC input CNINV Inverter output LED04 Lit: Microcomputer in operation...
  • Page 105: Noise Filter

    [4-2 Outdoor Unit Circuit Board Components ] 4-2-5 Noise Filter (1) YNU Surge absorber circuit Surge absorber circuit Ground F1, F2, F3, F4 Fuse 250 VAC 6.3 A TB13 Input (L3) TB12 Input (L2) TB11 Input (L1) Ground Ground Ground TB22 TB23 TB21...
  • Page 106 [4-2 Outdoor Unit Circuit Board Components ] (2) TNU CN14 Surge absorber circuit Surge absorber circuit TB12 Open-phase detection circuit Input (L2) Open-phase detection circuit TB11 TB13 Input (L1) Input (L3) CN12 Output F1, F2 Fuse 250 VAC 6.3 A CN13 Output Ground...
  • Page 107: Capacitor Board (Cap Board)

    [4-2 Outdoor Unit Circuit Board Components ] 4-2-6 Capacitor Board (CAP Board) (1) TNU SC-N SC-PL SC-P1L Bus voltage input (N) Bus voltage input (P) Bus voltage input (P) Connects to INV38 Connects to INV38 Connects to INV38 CNRY Connects to connector CNRYA CNRY2 Connects to...
  • Page 108 [4-2 Outdoor Unit Circuit Board Components ] (2) YNU CN-CAP Connects to INV42Y FT-P1C Connects to INV42Y C1-C4 Smoothing capacitor 1) When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components. Before inspecting the inside of the control box, turn off the power, keep the unit off for at least 10 minutes, and confirm that the capacitor voltage (inverter main circuit) has dropped to 20 VDC or less.
  • Page 109: Outdoor Unit Electrical Wiring Diagrams

    [4-3 Outdoor Unit Electrical Wiring Diagrams ] Outdoor Unit Electrical Wiring Diagrams (1) YNU 14 - chapter 4 HWE18220_GB...
  • Page 110 [4-3 Outdoor Unit Electrical Wiring Diagrams ] (2) TNU HWE18220_GB chapter 4 -...
  • Page 111: Transmission Booster Electrical Wiring Diagrams

    [4-4 Transmission Booster Electrical Wiring Diagrams ] Transmission Booster Electrical Wiring Diagrams Terminal block for power supply (TB1) 250V 5A Red Red Red Black White White Green/Yellow 220 - 240VAC Varistor Noise filter Black White White White White Varistor Green Black Blue Stabilized power supply...
  • Page 112: Bc Controller Circuit Board Arrangement

    [4-5 BC Controller Circuit Board Arrangement ] BC Controller Circuit Board Arrangement 4-5-1 BC Controller Control Box 1. CMB-P1016V-J1, JA1, KA1 Transformer Terminal block for power supply Terminal block for transmission line Relay board BC board HWE18220_GB chapter 4 -...
  • Page 113: Bc Controller Circuit Board Components

    [4-6 BC Controller Circuit Board Components ] BC Controller Circuit Board Components 4-6-1 BC Board Abbreviated name of Example: (BU) above connector color CN601 indicates that the connector is blue. Examples BU:BLUE BK:BLACK GN:GREEN YE:YELLOW WH:WHITE RD:RED 18 - chapter 4 HWE18220_GB...
  • Page 114: Four-Relay Board

    [4-6 BC Controller Circuit Board Components ] 4-6-2 Four-Relay Board 4-6-3 Ten-Relay Board HWE18220_GB chapter 4 -...
  • Page 115: Bc Controller Electrical Wiring Diagrams

    [4-7 BC Controller Electrical Wiring Diagrams ] BC Controller Electrical Wiring Diagrams (1) CMB-P104NU-J1 model 20 - chapter 4 HWE18220_GB...
  • Page 116 [4-7 BC Controller Electrical Wiring Diagrams ] (2) CMB-P106NU-J1 model HWE18220_GB chapter 4 -...
  • Page 117 [4-7 BC Controller Electrical Wiring Diagrams ] (3) CMB-P108NU-J1 model 22 - chapter 4 HWE18220_GB...
  • Page 118 [4-7 BC Controller Electrical Wiring Diagrams ] (4) CMB-P1012, P1016NU-J1 models HWE18220_GB chapter 4 -...
  • Page 119 [4-7 BC Controller Electrical Wiring Diagrams ] (5) CMB-P108NU-JA1 model 24 - chapter 4 HWE18220_GB...
  • Page 120 [4-7 BC Controller Electrical Wiring Diagrams ] (6) CMB-P1012, P1016NU-JA1 models HWE18220_GB chapter 4 -...
  • Page 121 [4-7 BC Controller Electrical Wiring Diagrams ] (7) CMB-P1016NU-KA1 model 26 - chapter 4 HWE18220_GB...
  • Page 122 [4-7 BC Controller Electrical Wiring Diagrams ] (8) CMB-P104NU-KB1 model HWE18220_GB chapter 4 -...
  • Page 123 [4-7 BC Controller Electrical Wiring Diagrams ] (9) CMB-P108NU-KB1 model 28 - chapter 4 HWE18220_GB...
  • Page 124: Chapter 5 Control

    Chapter 5 Control Dipswitch Functions and Factory Settings ..................1 5-1-1 Outdoor Unit Switch Functions and Factory Settings ................1 5-1-2 Indoor Unit Switch Functions and Factory Settings ................7 5-1-3 Remote Controller Switch Functions and Factory Settings..............8 5-1-4 BC Controller Switch Settings.......................
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  • Page 126: Dipswitch Functions And Factory Settings

    [5-1 Dipswitch Functions and Factory Settings ] 5 Control Dipswitch Functions and Factory Settings 5-1-1 Outdoor Unit Switch Functions and Factory Settings (1) Control board Function according to switch setting Units that require Switch setting tim- Switch Function switch setting (Note 2) Unit address setting Set to 00 or 51-100 with the dial switch...
  • Page 127 [5-1 Dipswitch Functions and Factory Settings ] Function according to switch setting Units that require Switch setting tim- Switch Function switch setting (Note 2) Enables or disables the detection of the following types of in- verter compressor er- rors ACCT, DCCT sensor error(5301 Detail code 115, 116) Error detection dis-...
  • Page 128 [5-1 Dipswitch Functions and Factory Settings ] 1) Unless otherwise specified, leave the switch to OFF where indicated by "-" or where the cells are blank, which may be set to OFF for a reason. 2) A: Only the switch on OC needs to be set for the setting to be effective. B: The switches on both the OC and OS need to be set to the same setting for the setting to be effective.
  • Page 129 [5-1 Dipswitch Functions and Factory Settings ] Function according to switch setting Units that require Switch Function Switch setting timing switch setting OFF (LED3 Unlit) ON (LED3 Lit) (Note 2) Refer to the following page(s). [10 LED Sta- 1-10 Self-diagnosis/operation SW6-10: tus Indicators on the Outdoor Unit Circuit Anytime after power on...
  • Page 130 [5-1 Dipswitch Functions and Factory Settings ] To change the settings, set SW6-10 to ON, set SW4, and press and hold SWP01 for 2 seconds or longer (OFF ON). LED3 will light up when the switch setting is ON, and lights off when OFF. Use the LED3 display to confirm that the settings are properly made.
  • Page 131 [5-1 Dipswitch Functions and Factory Settings ] (2) Fan board Function according to switch setting Switch Function Switch setting timing Enabling/Disabling no-load opera- No-load oper- No-load oper- Anytime after power on tion ation disabled ation enabled No-load operation will continue for approximately 30 seconds, and then the unit will come to an ab- normal stop.
  • Page 132: Indoor Unit Switch Functions And Factory Settings

    [5-1 Dipswitch Functions and Factory Settings ] 5-1-2 Indoor Unit Switch Functions and Factory Settings (1) Dipswitches 1) SW1,3 Function according to switch setting Switch setting timing Switch Function Notes Set to ON (built-in sensor on the remote controller) Room temperature Built-in sensor on Indoor unit inlet on All Fresh (PEFY-NMHU-E-DA, CFM(R)-E)
  • Page 133: Remote Controller Switch Functions And Factory Settings

    [5-1 Dipswitch Functions and Factory Settings ] (2) Address switch Actual indoor unit address setting varies in different systems. Refer to the installation manual for the outdoor unit for details on how to make the address setting. Each address is set with a combination of the settings for the 10's digit and 1's digit. (Example) When setting the address to "3", set the 1's digit to 3, and the 10's digit to 0.
  • Page 134 [5-1 Dipswitch Functions and Factory Settings ] (2) ME remote controller (PAR-F27MEA-US) Set the address of the remote controller with the rotary switch. Rotary switch 10's digit 1's digit (left) (right) Remote controller unit Example: In case of address 108 Address setting range Setting method Main remote controller...
  • Page 135: Bc Controller Switch Settings

    [5-1 Dipswitch Functions and Factory Settings ] 5-1-4 BC Controller Switch Settings Function according to switch setting Switch Function Switch setting timing Model setting R410A Always leave this switch to OFF. 2 - 5 No. of ports Before being energized 7, 8 1 - 6 Model setting...
  • Page 136: Outdoor Unit Control

    [5-2 Outdoor Unit Control ] Outdoor Unit Control 5-2-1 Overview The outdoor units are designated as OC and OS in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large). The setting of outdoor unit can be verified by using the self-diagnosis switch (SW4).
  • Page 137: Startup Control

    [5-2 Outdoor Unit Control ] 5-2-4 Startup Control The upper limit of frequency during the first 3 minutes of the operation is 50 Hz. When the power is turned on, normal operation will start after the initial start-up mode has been completed (with a restriction on the frequency).
  • Page 138: Frequency Control

    [5-2 Outdoor Unit Control ] 5-2-6 Frequency Control Depending on the capacity required, the frequency of the compressor is controlled to keep constant evaporation temperature (0°C [32°F] = 0.71 MPa [103 psi]) during cooling operation, and condensing temperature (49°C [120°F] = 2.88 MPa [418 psi]) during heating operation.
  • Page 139: Defrost Operation Control

    [5-2 Outdoor Unit Control ] 5-2-7 Defrost Operation Control (1) Starting the defrost operation The defrost cycle will start when all of the three conditions (outside temperature, cumulative compressor operation time, and pipe temperature) under <Condition 1>, <Condition 2>, or <Condition 3> are met. Condition 1 Condition 2 Condition 3...
  • Page 140 [5-2 Outdoor Unit Control ] (2) Defrost operation Outdoor unit Compressor frequency Model Compressor frequency HP72 model 107Hz HP96, HP120 models 121Hz Outdoor unit fan Stopped SV1a ON (open) LEV2a, 2b 3000 LEV2d LEV4 LEV9 21S4a, 21S4b OFF (closed), ON (open) BC controller LEV1 J type: 3000, JA type: 3000, KA type: 3000...
  • Page 141 [5-2 Outdoor Unit Control ] (3) Stopping the defrost operation The defrost cycle ends when 12 minutes have passed since the beginning of the cycle, or when the pipe temperatures (TH3) have been continuously detected for 4 minutes (when SW4 (916) is set to OFF) or 2 minutes (when SW4 (916) is set to ON) that exceeds the values in the table below.
  • Page 142: Continuous Heating Mode Control

    [5-2 Outdoor Unit Control ] 5-2-8 Continuous heating mode control (1) Continuous heating mode start conditions Continuous heating mode will start when all the conditions listed in the table below are met (outside temperature, cumulative compressor operation time, and piping temperature). However, even when the conditions are met, after the maximum number of consecutive continuous heating operation shown below is performed, the reverse defrost operation will be performed one time.
  • Page 143 [5-2 Outdoor Unit Control ] 2) When combination of units For a combination of units, operation is split so that there is a unit for defrosting and a unit for the heating operation. If one of the combination of units is operated, the stopped unit is started, the unit that was operating is defrosted, and then the unit that was stopped before the control began is defrosted.
  • Page 144: Refrigerant Recovery Control

    [5-2 Outdoor Unit Control ] 5-2-9 Refrigerant Recovery Control Refrigerant recovery is performed for each BC port during heating operation to prevent the refrigerant from accumulating in- side the units that are stopped (in the fan mode), in the cooling mode, or in the heating Thermo-OFF mode. It is also performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor heat exchanger.
  • Page 145: Expansion Valve Control (Lev2A, Lev2B, And Lev2D)

    [5-2 Outdoor Unit Control ] (4) Evaporation temperature control (Expansion valves LEV2a and LEV2b) LEV is controlled every 30 seconds so that the temperature at the bypass inlet (TH15) of the BC controller is in a constant range during heating-main operation. 5-2-11 Expansion valve control (LEV2a, LEV2b, and LEV2d) The default opening levels of the expansion valves LEV2a and LEV2b are shown in Section [5-2-10 Outdoor Unit Fan Control].
  • Page 146 [5-2 Outdoor Unit Control ] (2) Two-outdoor-unit system Initial startup mode starts. The compressor on the OC starts up. 60Hz The total operating load of the indoor unit after 5 minutes of operation is P96 or above. (*1 Qj The compressor on the OC starts up. The compressor on the OC remains in operation, and the compressor on the OS starts up.
  • Page 147: Emergency Operation Mode

    [5-2 Outdoor Unit Control ] 5-2-15 Emergency Operation Mode 1. Problems with the outdoor unit Systems with two outdoor units have a mode that allows one of the outdoor units to perform a backup operation when the other outdoor unit in the system malfunctions. This mode can be started by performing an error reset via the remote controller.
  • Page 148 [5-2 Outdoor Unit Control ] (2) Ending the emergency operation 1) End conditions When one of the following conditions is met, emergency operation stops, and the unit makes an error stop. When the integrated operation time of compressor in cooling mode has reached four hours. When the integrated operation time of compressor in heating mode has reached two hours.
  • Page 149: Operation Mode

    [5-2 Outdoor Unit Control ] 5-2-16 Operation Mode (1) Indoor unit operation mode The operation mode can be selected from the following 6 modes using the remote controller. Cooling mode Heating mode Dry mode Automatic cooling/heating mode Fan mode Stopping mode (2) Outdoor unit operation mode Cooling only mode All indoor units in operation are in cooling mode.
  • Page 150: Demand Control

    [5-2 Outdoor Unit Control ] 5-2-17 Demand Control Cooling/heating operation can be prohibited (Thermo-OFF) by an external input to the indoor units. When DIP SW6-8 is set to ON, the 4-step DEMAND control is enabled. Eight-step demand control is possible in the system with two outdoor units. For details, refer to the following page(s).
  • Page 151: Bc Controller Control

    [5-3 BC Controller Control ] BC Controller Control 1. Control of SVA, SVB, and SVC SVA, SVB, and SVC turn on or off depending on the operation mode of the branch. Mode Cooling Heating Stopped Defrost Port 2. Control of SVM1 snd SVM1b SVM turns on or off depending on the operation mode.
  • Page 152: Chapter 6 Test Run

    Chapter 6 Test Run Read before Test Run........................... 1 Operation Characteristics and Refrigerant Charge ................2 Evaluating and Adjusting Refrigerant Charge ................... 3 6-3-1 Refrigerant Overcharge and undercharge ....................3 6-3-2 Checking the Refrigerant Charge during Operation................3 6-3-3 Maximum refrigerant charge ........................3 6-3-4 Refrigerant Charge Adjustment Mode ....................
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  • Page 154: Read Before Test Run

    [6-1 Read before Test Run ] 6 Test Run Read before Test Run (1) Check for refrigerant leak and loose cables and connectors. (2) When opening or closing the front panel of the control box, do not let it come into contact with any of the internal components.
  • Page 155: Operation Characteristics And Refrigerant Charge

    [6-2 Operation Characteristics and Refrigerant Charge ] Operation Characteristics and Refrigerant Charge It is important to have a clear understanding of the characteristics of refrigerant and the operating characteristics of air conditioners before attempting to adjust the refrigerant amount in a given system. The following shows items of particular importance.
  • Page 156: Evaluating And Adjusting Refrigerant Charge

    [6-3 Evaluating and Adjusting Refrigerant Charge ] Evaluating and Adjusting Refrigerant Charge 6-3-1 Refrigerant Overcharge and undercharge Overcharging or undercharging of refrigerant can cause the following symptoms: Before attempting to adjust the amount of refrigerant in the system, thoroughly check the operating conditions of the system. Then, adjust the refrigerant amount by running the unit in the refrigerant amount adjust mode.
  • Page 157: Refrigerant Charge Adjustment Mode

    [6-3 Evaluating and Adjusting Refrigerant Charge ] 6-3-4 Refrigerant Charge Adjustment Mode When the function switch (SW4 (922)) on the main board on the outdoor unit (OC only) is turned to ON, the unit goes into the refrigerant amount adjust mode, and operation <A> below is followed. The unit will not go into the refrigerant amount adjust mode when the switch on the OS is set to ON.
  • Page 158 [6-3 Evaluating and Adjusting Refrigerant Charge ] Start Turn on SW4 (922) on the OC. Operation of the Refrigerant Amount Adjust Mode Put all indoor units in the test run mode When the unit is the refrigerant amount adjust mode, the LEV on the and run the units in cooling mode.
  • Page 159: The Following Symptoms Are Normal

    [6-4 The Following Symptoms Are Normal ] The Following Symptoms Are Normal Remote controller Symptoms Cause display The indoor unit does not start "Cooling (heating)" The unit cannot perform a heating (cooling) operation when other indoor after starting cooling (heating) icon blinks on the units on the same refrigerant system, are performing a cooling (heating) operation.
  • Page 160: Chapter 7 Troubleshooting Using Error Codes

    Chapter 7 Troubleshooting Using Error Codes Error Code and Preliminary Error Code Lists ..................1 Error Code Definitions and Solutions: Codes [0 - 999] ..............6 7-2-1 Error Code [0403] ........................... 6 7-2-2 Error Code [0404] ........................... 7 Error Code Definitions and Solutions: Codes [1000 - 1999] ............. 8 7-3-1 Error Code [1102] ...........................
  • Page 161 7-6-25 Error Code [4250] Detail Codes 121, 128, and 122................36 7-6-26 Error Codes [4255, 4256] Detail Code 137................... 36 7-6-27 Error Code [4260] ..........................37 Error Code Definitions and Solutions: Codes [5000 - 5999] ............38 7-7-1 Error Codes [5101, 5102, 5103, 5104]....................38 7-7-2 Error Codes [5103,5104,5105,5107,5115]....................
  • Page 162 7-9-4 Error Code [7105] ..........................70 7-9-5 Error Code [7106] ..........................70 7-9-6 Error Code [7107] ..........................71 7-9-7 Error Code [7110] ..........................72 7-9-8 Error Code [7111] ..........................72 7-9-9 Error Code [7113] ..........................73 7-9-10 Error Code [7117] ..........................75 7-9-11 Error Code [7130] ..........................
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  • Page 164: Error Code And Preliminary Error Code Lists

    [7-1 Error Code and Preliminary Error Code Lists ] 7 Troubleshooting Using Error Codes Error Code and Preliminary Error Code Lists Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code 4300 Serial communication error/Panel communication 0403 4305 (page 6)
  • Page 165 [7-1 Error Code and Preliminary Error Code Lists ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code 4240 4245 4340 Overload protection (page 31) 4246 Backup operation [101] IPM error (page 32) [104] Short-circuited IPM/Ground fault (page 33)
  • Page 166 [7-1 Error Code and Preliminary Error Code Lists ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code Backup operation 5110 1214 Temperature sensor Heatsink temperature (page 40) fault (THHS) Temperature sensor Liquid inlet temperature 5111 fault...
  • Page 167 [7-1 Error Code and Preliminary Error Code Lists ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code Transmission Bus-Busy error in centralized control [001] (page 49) system 6603 [002] Transmission Bus-Busy error in indoor unit system (page 49) Communication error between device processor 6606...
  • Page 168 [7-1 Error Code and Preliminary Error Code Lists ] The last digit in the check error codes in the 4000's and 5000's and two-digit detail codes indicate if the codes apply to inverter on fan inverter. Example Code 4225 (detail code 108): Bus voltage drop in the fan inverter system Code 4230 : Heatsink overheat protection in the inverter system The last digit Inverter system...
  • Page 169: Error Code Definitions And Solutions: Codes [0 - 999]

    [7-2 Error Code Definitions and Solutions: Codes [0 - 999] ] Error Code Definitions and Solutions: Codes [0 - 999] 7-2-1 Error Code [0403] 1. Error code definition Serial communication error 2. Error definition and error detection method Serial communication error between the control board and the INV board on the compressor, and between the control board and the Fan board Detail code 1: Between the control board and the INV board Detail code 5, 6: Between the control board and the Fan board...
  • Page 170: Error Code [0404]

    [7-2 Error Code Definitions and Solutions: Codes [0 - 999] ] 7-2-2 Error Code [0404] 1. Error code definition Indoor unit control-related errors 2. Error definition and error detection method Indoor controller board Abnormal if data cannot be read normally from the nonvolatile memory of the indoor controller board. 3.
  • Page 171: Error Code [1301]

    [7-3 Error Code Definitions and Solutions: Codes [1000 - 1999] ] Error Code Definitions and Solutions: Codes [1000 - 1999] 7-3-1 Error Code [1102] 1. Error code definition Discharge temperature fault 2. Error definition and error detection method 1) If the discharge temperature of 120 °C [248°F] or more is detected during the operation (the first detection), the outdoor unit stops once, turns to anti-restart mode for 3 minutes, and restarts after 3 minutes automatically.
  • Page 172 [7-3 Error Code Definitions and Solutions: Codes [1000 - 1999] ] 7-3-2 Error Code [1301] 1. Error code definition Low pressure fault 2. Error definition and error detection method When starting the compressor from Stop Mode for the first time if low pressure reads 0.098MPa [14psi] immediately before start-up, the operation immediately stops.
  • Page 173: Error Code [1302] (During Operation)

    [7-3 Error Code Definitions and Solutions: Codes [1000 - 1999] ] 7-3-3 Error Code [1302] (during operation) 1. Error code definition High pressure fault 1 (Outdoor unit) 2. Error definition and error detection method 1) If the pressure of 3.78MPa [548psi] or higher is detected by the pressure sensor during operation (the first detection), the out- door stops once, turns to antirestart mode for 3 minutes, and restarts after 3 minutes automatically.
  • Page 174: Error Code [1302] (At Startup)

    [7-3 Error Code Definitions and Solutions: Codes [1000 - 1999] ] (21) Thermistor mounting problem (TH3, TH7) Check the sensor temperature/pressure on the LED monitor. (22) Disconnected male connector on the pressure switch (63H1) or disconnected wire (23) Open phase in the power-supply due to improper power-supply Refer to item (6) in section [6-1 Read before Test wiring Run].
  • Page 175: Error Code Definitions And Solutions: Codes [2000 - 2999]

    [7-4 Error Code Definitions and Solutions: Codes [2000 - 2999] ] Error Code Definitions and Solutions: Codes [2000 - 2999] 7-4-1 Error Code [2500] (Models with a drain sensor) 1. Error code definition Drain sensor submergence 2. Error definition and error detection method 1) If an immersion of the drain sensor in the water is detected while the unit is in any mode other than the Cool/Dry mode and when the drain pump goes from OFF to ON, this condition is considered preliminary water leakage.
  • Page 176: Error Code [2500] (Models With A Float Switch)

    [7-4 Error Code Definitions and Solutions: Codes [2000 - 2999] ] 7-4-2 Error Code [2500] (Models with a float switch) 1. Error code definition Drain sensor submergence 2. Error definition and error detection method 1) If an immersion of the float switch in the water is detected while the unit is in any mode other than the Cool/Dry mode and when the drain pump goes from OFF to ON, this condition is considered preliminary water leakage.
  • Page 177: Error Code [2502] (Models With A Drain Sensor)

    [7-4 Error Code Definitions and Solutions: Codes [2000 - 2999] ] 7-4-3 Error Code [2502] (Models with a drain sensor) 1. Error code definition Drain pump fault 2. Error definition and error detection method 1) Make the drain sensor thermistor self-heat by passing current through it. If the temperature rise is small, it is interpreted that the sensor is immersed in water.
  • Page 178: Error Code [2502] (Models With A Float Switch)

    [7-4 Error Code Definitions and Solutions: Codes [2000 - 2999] ] 7-4-4 Error Code [2502] (Models with a float switch) 1. Error code definition Drain pump fault 2. Error definition and error detection method 1) The immersion of sensor tip in water is detected by the ON/OFF signal from the float switch. Submergence of the sensor When it is detected that the float switch has been ON for 15 seconds, it is interpreted that the sensor tip is immersed in water.
  • Page 179: Error Code [2503]

    [7-4 Error Code Definitions and Solutions: Codes [2000 - 2999] ] 7-4-5 Error Code [2503] 1. Error code definition Drain sensor (Thd) fault 2. Error definition and error detection method If the open or short circuit of the thermistor has been detected for 30 seconds, this condition is considered to be a preliminary error, and the unit goes into the 3-minute restart delay mode.
  • Page 180: Error Code [2601]

    [7-4 Error Code Definitions and Solutions: Codes [2000 - 2999] ] 7-4-6 Error Code [2600] 1. Error code definition Water leakage 2. Cause, check method and remedy Check that water does not leak from the pipes in such as the humidifier. 7-4-7 Error Code [2601] 1.
  • Page 181: Error Code Definitions And Solutions: Codes [3000 - 3999]

    [7-5 Error Code Definitions and Solutions: Codes [3000 - 3999] ] Error Code Definitions and Solutions: Codes [3000 - 3999] 7-5-1 Error Code [3121] 1. Error code definition Out-of-range outside air temperature 2. Error definition and error detection method When the thermistor temperature of -28°C[-18°F] or below has continuously been detected for 3 minutes during heating op- eration (during compressor operation), the unit makes an error stop and "3121"...
  • Page 182: Error Code [3511]

    [7-5 Error Code Definitions and Solutions: Codes [3000 - 3999] ] 7-5-2 Error Code [3511] 1. Error code definition Refrigerant overcooling 2. Error definition and error detection method 1) If the condition "THHS °C remains true for continuous 6 minutes and 30 seconds" is met (for the first time) during oper- ation, the outdoor unit will stop, go into the three-minute restart delay mode, and then automatically resume operation after three minutes have passed.
  • Page 183 [7-5 Error Code Definitions and Solutions: Codes [3000 - 3999] ] 7-5-3 Error Code [3512] 1. Error code definition Cooling fan locking 2. Error definition and error detection method The motor on the cooling fan locks during operation. 3. Cause, check method and remedy Cause Check method and remedy Locked cooling fan motor...
  • Page 184: Error Code Definitions And Solutions: Codes [4000 - 4999]

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] Error Code Definitions and Solutions: Codes [4000 - 4999] 7-6-1 Error Code [4102] 1. Error code definition Open phase 2. Error definition and error detection method An open phase of the power supply was detected at power on. The open phase of the power supply may not always be detected if a power voltage from another circuit is applied.
  • Page 185: Error Code [4106]

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-2 Error Code [4106] 1. Error code definition <Transmission power supply fault Error detail code FF (Outdoor unit)> 2. Error definition and error detection method Transmission power output failure 3.
  • Page 186: Error Code [4121]

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-4 Error Code [4114] 1. Error code definition Indoor unit fan motor error 2. Error definition and error detection method When the fan motor output from the indoor unit circuit board is ON and when the rotation speed input from the fan motor cannot be detected for 30 seconds or more 3.
  • Page 187 [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-7 Error Code [4124] 1. Error code definition Electric system not operate due to damper abnormality 2. Error definition and error detection method When the damper is not located at the designated position. 3.
  • Page 188: Error Codes [4220, 4225, 4226] Detail Code 108

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-8 Error Codes [4220, 4225, 4226] Detail Code 108 1. Error code definition Abnormal bus voltage drop (Detail code 108) (YNU) 2. Error definition and error detection method If Vdc 289V or less is detected during Inverter operation. (S/W detection) 3.
  • Page 189: Error Codes [4220, 4225, 4226] Detail Code 108

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-9 Error Codes [4220, 4225, 4226] Detail Code 108 1. Error code definition Abnormal bus voltage drop (Detail code 108) (TNU) 2. Error definition and error detection method If Vdc 160V or less is detected during Inverter operation. (S/W detection) 3.
  • Page 190: Error Codes [4220, 4225, 4226] Detail Code 109

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-10 Error Codes [4220, 4225, 4226] Detail Code 109 1. Error code definition Abnormal bus voltage rise (Detail code 109) 2. Error definition and error detection method If Vdc 830V is detected during inverter operation.
  • Page 191: Error Codes [4220, 4225, 4226] Detail Code 111, 112

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-12 Error Codes [4220, 4225, 4226] Detail Code 111, 112 1. Error code definition Logic error (Detail code 111, 112) 2. Error definition and error detection method Hardware error If only the hardware error logic circuit operates, and no identifiable error is detected.
  • Page 192: Error Code [4220] Detail Code 129

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-14 Error Code [4220] Detail Code 129 1. Error code definition Control power supply error (Detail code 129)(outdoor unit) 2. Error definition and error detection method INV42Y, and INV38 Detection of insufficient drive voltage for relays on INV board 3.
  • Page 193: Error Code [4230] Detail Code 125

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-17 Error Code [4230] Detail Code 125 1. Error code definition Heatsink overheat protection (Detail code 125) 2. Error definition and error detection method When the heat sink temperature (THHS) remains at or above TOH is detected. models INV42Y, INV38 100°C...
  • Page 194: Error Codes [4240, 4245, 4246]

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-19 Error Codes [4240, 4245, 4246] 1. Error code definition Overload protection (YNU) 2. Error definition and error detection method If the output current of "(Iac) >Imax (Arms)" or "THHS > TOL" is continuously detected for 10 minutes during inverter operation. Refer to the following page(s).
  • Page 195: Error Codes [4250, 4255, 4256] Detail Code 101

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-21 Error Codes [4250, 4255, 4256] Detail Code 101 1. Error code definition IPM error (Detail code 101) 2. Error definition and error detection method In the case of 4250 If an overcurrent is detected by the overcurrent detection circuit (INV42Y: R100, INV38 (CT001)) on the INV board.
  • Page 196: Error Codes [4250, 4255, 4256] Detail Code 104

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-22 Error Codes [4250, 4255, 4256] Detail Code 104 1. Error code definition Short-circuited IPM/Ground fault (Detail code 104) 2. Error definition and error detection method When IPM/IGBT short damage or grounding on the load side is detected just before starting the inverter. 3.
  • Page 197: Error Codes [4250, 4255, 4256] Detail Code 105

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-23 Error Codes [4250, 4255, 4256] Detail Code 105 1. Error code definition Overcurrent error due to short-circuited motor (Detail code 105) 2. Error definition and error detection method When a short is detected on the load side just before starting the inverter operation.
  • Page 198: Error Codes [4250, 4255, 4256] Detail Codes 106 And 107

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-24 Error Codes [4250, 4255, 4256] Detail Codes 106 and 107 1. Error code definition Instantaneous overcurrent (Detail code 106) Overcurrent (effective value) (Detail code 107) 2. Error definition and error detection method When a current above the specified value is detected by the electric current sensor.
  • Page 199 [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-25 Error Code [4250] Detail Codes 121, 128, and 122 1. Error code definition DCL overcurrent error (H/W) (Detail code 121 and 128)(outdoor unit) DCL overcurrent error (S/W) (Detail code 122) (outdoor unit) 2.
  • Page 200: Error Code [4260]

    [7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ] 7-6-27 Error Code [4260] 1. Error code definition Heatsink overheat protection at startup 2. Error definition and error detection method When heatsink temperature (THHS) remains at or above TOH for 10 minutes or longer after inverter startup models INV42Y, INV38Y 100 C...
  • Page 201: Error Code Definitions And Solutions: Codes [5000 - 5999]

    [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] Error Code Definitions and Solutions: Codes [5000 - 5999] 7-7-1 Error Codes [5101, 5102, 5103, 5104] 1. Error code definition 5101 Return air temperature sensor (TH21) fault (Indoor unit) Return air temperature sensor (TH4) fault (OA processing unit) 5102 Pipe temperature sensor (TH22) fault (Indoor unit)
  • Page 202: Error Codes [5103,5104,5105,5107,5115]

    [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-2 Error Codes [5103,5104,5105,5107,5115] 1. Error code definition 5103 Heat exchanger outlet temperature sensor (TH3) fault (Outdoor unit) 5104 Discharge temperature sensor (TH4) fault (Outdoor unit) 5105 Accumulator inlet temperature sensor (TH5) fault (Outdoor unit) 5107 Outside temperature sensor (TH7) fault (Outdoor unit) 5115...
  • Page 203: Error Code [5110]

    [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-3 Error Code [5110] 1. Error code definition Heatsink temperature sensor (THHS) fault (Detail code 01) 2. Error definition and error detection method When a short or an open of THHS is detected just before or during the inverter operation. 3.
  • Page 204: Error Code [5201]

    [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-5 Error Code [5201] 1. Error code definition High-pressure sensor fault (63HS1) 2. Error definition and error detection method If the high pressure sensor detects 0.098MPa [14psi] or less during the operation, the outdoor unit stops once, turns to anti- restart mode for 3 minutes, and restarts after 3 minutes when the detected high pressure sensor is 0.098MPa [14psi] or more.
  • Page 205: Error Code [5301] Detail Code 115

    [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-7 Error Code [5301] Detail Code 115 1. Error code definition ACCT sensor fault (Detail code 115) (YNU) 2. Error definition and error detection method When the formula "output current < 1.8 Arms" remains satisfied for 10 seconds while the inverter is in operation. 3.
  • Page 206: Error Code [5301] Detail Code 117

    [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-9 Error Code [5301] Detail Code 117 1. Error code definition ACCT sensor circuit fault (Detail code 117) 2. Error definition and error detection method When an error value is detected with the ACCT detection circuit just before the inverter starts 3.
  • Page 207: Error Code [5301] Detail Code 120

    [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-11 Error Code [5301] Detail Code 120 1. Error code definition Faulty ACCT wiring (Detail code 120) 2. Error definition and error detection method Presence of target current cannot be detected during the self-diagnostic operation immediately before startup. 3.
  • Page 208: Error Codes [5305, 5306] Detail Code 135

    [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-13 Error Codes [5305, 5306] Detail Code 135 1. Error code definition Current sensor fault (Detail code 135) 2. Error definition and error detection method Detection of output current below 0.2 Arms for 10 continuous seconds while fan motor is in operation 3.
  • Page 209: Error Code Definitions And Solutions: Codes [6000 - 6999]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] Error Code Definitions and Solutions: Codes [6000 - 6999] 7-8-1 Error Code [6201] 1. Error code definition Remote controller board fault (nonvolatile memory error) 2. Error definition and error detection method This error is detected when the data cannot be read out from the built-in nonvolatile memory on the remote controller.
  • Page 210: Error Code [6601]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-4 Error Code [6601] 1. Error code definition Polarity setting error 2. Error definition and error detection method The error detected when transmission processor cannot distinguish the polarities of the M-NET transmission line. 3.
  • Page 211: Error Code [6603]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-5 Error Code [6602] 1. Error code definition Transmission processor hardware error 2. Error definition and error detection method Although "0" was surely transmitted by the transmission processor, "1" is displayed on the transmission line. Detail code 001: Transmission processor hardware error in centralized control system Detail code 002: Transmission processor hardware error in indoor unit system The address/attribute appeared on the display on the remote controller indicates the controller where an error oc-...
  • Page 212: Error Code [6606]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-6 Error Code [6603] 1. Error code definition Transmission line bus busy error 2. Error definition and error detection method Generated error when the command cannot be transmitted for 4-10 minutes in a row due to bus-busy Generated error when the command cannot be transmitted to the transmission line for 4-10 minutes in a row due to noise Detail code 001: Transmission Bus-Busy error in centralized control system Detail code 002: Transmission Bus-Busy error in indoor unit system...
  • Page 213: Error Code [6607] Error Source Address = Outdoor Unit (Oc)

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-8 Error Code [6607] Error Source Address = Outdoor Unit (OC) 1. Error code definition No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 214: Error Code [6607] Error Source Address = Indoor Unit (Ic)

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-10 Error Code [6607] Error Source Address = Indoor Unit (IC) 1. Error code definition No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 215 [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] (2) Troubleshooting problems for indoor units (B) Cause Check method and remedy When the power supply unit for transmission lines is used Check voltage of the transmission line for central- and the male power supply connector is connected to the ized control.
  • Page 216: Error Code [6607] Error Source Address = Lossnay (Lc)

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-11 Error Code [6607] Error Source Address = LOSSNAY (LC) 1. Error code definition No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 217: Error Code [6607] Error Source Address = Me Remote Controller

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-12 Error Code [6607] Error Source Address = ME Remote Controller 1. Error code definition No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 218: Error Code [6607] Error Source Address = System Controller

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-13 Error Code [6607] Error Source Address = System Controller 1. Error code definition No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 219: Error Code [6607] All Error Source Addresses

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-14 Error Code [6607] All Error Source Addresses 1. Error code definition No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 220: Error Code [6607] No Error Source Address

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-15 Error Code [6607] No Error Source Address 1. Error code definition No ACK error 2. Error definition and error detection method The error is detected when no acknowledgement (ACK signal) is received after the transmission. (eg. When the data is trans- mitted six times in a row with 30 seconds interval, the error is detected on the transmission side.) The address/attribute appeared on the display on the remote controller indicates the controller which did not provide the response (ACK).
  • Page 221: Error Code [6608]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-16 Error Code [6608] 1. Error code definition No response error 2. Error definition and error detection method When no response command is returned although acknowledgement (ACK) is received after transmission, an error is detect- When the data is transmitted 10 times in a row with 3 seconds interval, an error is detected on the transmission side.
  • Page 222: Error Code [6832]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-17 Error Code [6831] 1. Error code definition MA remote controller signal reception error (No signal reception) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. No proper data has been received for 3 minutes.
  • Page 223: Error Code [6834]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-18 Error Code [6832] 1. Error code definition MA remote controller signal transmission error (Synchronization error) 2. Error definition and error detection method MA remote controller and the indoor unit is not done properly. Failure to detect opening in the transmission path and unable to send signals Indoor unit: 3 minutes Remote controller: 6 seconds...
  • Page 224: Error Code [6841]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-19 Error Code [6833] 1. Error code definition MA remote controller signal transmission error (Hardware error) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. An error occurs when the transmitted data and the received data differ for 30 times in a row.
  • Page 225: Error Code [6843]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-20 Error Code [6834] 1. Error code definition MA remote controller signal reception error (Start bit detection error) 2. Error definition and error detection method Communication between the MA remote controller and the indoor unit is not done properly. No proper data has been received for 2 minutes.
  • Page 226 [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-21 Error Code [6840] 1. Error code definition Indoor-outdoor communication: Reception error 2. Error definition and error detection method Abnormal if indoor controller board could not receive any signal normally for 6 minutes after turning the power on Abnormal if indoor controller board could not receive any signal normally for 3 minutes.
  • Page 227 [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-23 Error Code [6842] 1. Error code definition Indoor-outdoor communication: Transmission error 2. Error definition and error detection method Indoor/outdoor unit communication error (Transmitting error) Abnormal if "1" receiving is detected 30 times continuously though indoor controller board has transmitted "0". 3.
  • Page 228 [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-24 Error Code [6843] 1. Error code definition A control communication start bit detection error 2. Error definition and error detection method Indoor/outdoor unit communication error Abnormal if indoor controller board could not receive any signal normally for 6 minutes after turning the power on. Abnormal if indoor controller board could not receive any signal normally for 3 minutes.
  • Page 229 [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-25 Error Code [6846] 1. Error code definition Start-up time over 2. Error definition and error detection method Start-up time over The unit cannot finish start-up process within 4 minutes after power on. 3.
  • Page 230: Error Code Definitions And Solutions: Codes [7000 - 7999]

    [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] Error Code Definitions and Solutions: Codes [7000 - 7999] 7-9-1 Error Code [7100] 1. Error code definition Total capacity error 2. Error definition and error detection method The model total of indoor units in the system with one outdoor unit exceeds limitations. 3.
  • Page 231: Error Code [7101]

    [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-2 Error Code [7101] 1. Error code definition Capacity code setting error 2. Error definition and error detection method Connection of incompatible (wrong capacity code) indoor unit or outdoor unit 3.
  • Page 232: Error Code [7102]

    [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-3 Error Code [7102] 1. Error code definition Wrong number of connected units 2. Error definition and error detection method The number of connected indoor units is "0" or exceeds the allowable value. 3.
  • Page 233: Error Code [7105]

    [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-4 Error Code [7105] 1. Error code definition Address setting error 2. Error definition and error detection method Erroneous setting of OC unit address Erroneous setting of BC controller address 3.
  • Page 234: Error Code [7111]

    [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-6 Error Code [7107] 1. Error code definition Port setting error 2. Error definition and error detection method The port with wrong number is connected to the indoor unit.The model total connected to the port is greater than the specifi- cation.
  • Page 235: Error Code [7113]

    [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-7 Error Code [7110] 1. Error code definition Connection information signal transmission/reception error 2. Error definition and error detection method The given indoor unit is inoperable because it is not properly connected to the outdoor unit in the same system. 3.
  • Page 236: Error Code [7130]

    [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-9 Error Code [7113] 1. Error code definition Function setting error (improper connection of CNTYP) 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Wiring fault (Detail code 15)
  • Page 237 [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] Error source Cause Check method and remedy BC controller Wiring fault Check the connector TYP1 on the control board. Loose connectors, short-cir- Check the settings of SW4-1, SW5-7, and SW5-8 on the control board. cuit, contact failure DIP SW setting error on the control board...
  • Page 238 [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-10 Error Code [7117] 1. Error code definition Model setting error 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Wiring fault (Detail code 15) Loose connectors, short-circuit, con- Check the connector CNTYP5 on the control board for...
  • Page 239 [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-11 Error Code [7130] 1. Error code definition Incompatible unit combination 2. Error definition and error detection method The check code will appear when the indoor units and BC controller with different refrigerant systems are connected. 3.
  • Page 240 Chapter 8 Troubleshooting Based on Observed Symptoms MA Remote Controller Problems......................1 8-1-1 The LCD Does Not Light Up........................1 8-1-2 The LCD Momentarily Lights Up and Then Goes Off................2 8-1-3 "HO" and "PLEASE WAIT" Do Not Go Off the Screen................3 8-1-4 Air Conditioning Units Do Not Operate When the ON Button Is Pressed.
  • Page 241 8-10-13 Simple Check on Inverter Circuit Components ..................52 8-10-14 Troubleshooting Problems with IGBT Module ..................53 8-10-15 Checking the Fan Inverter Heatsink for Clogging ................. 56 8-11 Control Circuit............................. 57 8-11-1 Control Power Supply Function Block....................57 8-11-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit ......59 8-12 Measures for Refrigerant Leakage ....................
  • Page 242: Ma Remote Controller Problems

    [8-1 MA Remote Controller Problems ] 8 Troubleshooting Based on Observed Symptoms MA Remote Controller Problems 8-1-1 The LCD Does Not Light Up. 1. Phenomena Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not start running. (Power indicator ( ) is unlit and no lines appear on the remote controller.) 2.
  • Page 243: The Lcd Momentarily Lights Up And Then Goes Off

    [8-1 MA Remote Controller Problems ] 8-1-2 The LCD Momentarily Lights Up and Then Goes Off. 1. Phenomena When the remote controller operation SW is turned on, the operation status briefly appears on the display, then it goes off, and the display lights out immediately, and the unit stops. 2.
  • Page 244: Ho" And "Please Wait" Do Not Go Off The Screen

    [8-1 MA Remote Controller Problems ] 8-1-3 "HO" and "PLEASE WAIT" Do Not Go Off the Screen. 1. Phenomena "HO" or "PLEASE WAIT" display on the remote controller does not disappear, and no operation is performed even if the button is pressed.
  • Page 245: Air Conditioning Units Do Not Operate When The On Button Is Pressed

    [8-1 MA Remote Controller Problems ] 8-1-4 Air Conditioning Units Do Not Operate When the ON Button Is Pressed. 1. Phenomena Even if the operation button on the remote controller is pressed, the indoor and the outdoor units do not start running. 2.
  • Page 246: Me Remote Controller Problems

    [8-2 ME remote Controller Problems ] ME remote Controller Problems 8-2-1 The LCD Does Not Light Up. 1. Phenomena Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not start running. (Remote controller is not powered.) 2.
  • Page 247: The Lcd Momentarily Lights Up And Then Goes Off

    [8-2 ME remote Controller Problems ] 8-2-2 The LCD Momentarily Lights Up and Then Goes Off. 1. Phenomena When the remote controller operation SW is turned on, a temporary operation display is indicated, and the display lights out immediately. 2. Cause 1) The power is not supplied to the indoor unit.
  • Page 248: Ho" Or "Waiting For

    [8-2 ME remote Controller Problems ] 8-2-3 "HO" or "Waiting for ···" Does Not Go Off the Screen. 1. Phenomena "HO" or "Waiting for ···" display on the remote controller does not disappear, and no operation is performed even if the button is pressed.
  • Page 249 [8-2 ME remote Controller Problems ] 3. Check method and remedy Without using MELANS Are all the units in the system experiencing the same problem? Check the address of the ME remote controller on which "HO" is displayed. Check the address of the outdoor unit.
  • Page 250: 88", "Request Denied." Appears On The Lcd

    [8-2 ME remote Controller Problems ] 8-2-4 "88", "Request denied." Appears on the LCD. 1. Phenomena "88", "Request denied." appears on the remote controller when the address is registered or confirmed. 2. Cause, check method and remedy Cause Check method and remedy An error occurs when the address is registered or con- firmed.
  • Page 251: Refrigerant Control Problems

    [8-3 Refrigerant Control Problems ] Refrigerant Control Problems 8-3-1 Units in the Cooling Mode Do Not Operate at Expected Capacity. 1. Phenomena Although cooling operation starts with the normal remote controller display, the capacity is not enough. 2. Cause, check method and remedy Cause Check method and remedy Compressor frequency does not rise sufficiently.
  • Page 252 [8-3 Refrigerant Control Problems ] Cause Check method and remedy RPM error of the outdoor unit FAN Refer to the following page(s). [8-7 Troubleshooting Outdoor Unit Fan Problems] Motor failure or board failure, or airflow rate de- [7-3-3 Error Code [1302] (during operation)] crease due to clogging of the heat exchanger The fan is not properly controlled as the outdoor temperature cannot be precisely detected by the...
  • Page 253: Units In The Heating Mode Do Not Operate At Expected Capacity

    [8-3 Refrigerant Control Problems ] 8-3-2 Units in the Heating Mode Do Not Operate at Expected Capacity. 1. Phenomena Although heating operation starts with the normal remote controller display, the capacity is not enough. 2. Cause, check method and remedy Cause Check method and remedy Compressor frequency does not rise sufficiently.
  • Page 254 [8-3 Refrigerant Control Problems ] Cause Check method and remedy Indoor unit LEV malfunction Refer to the following page(s).[8-8 Troubleshooting Insufficient refrigerant flows due to LEV malfunction LEV Problems] (not enough opening). Temperature reading error on the indoor unit piping Check the thermistor.
  • Page 255: Outdoor Units Stop At Irregular Times

    [8-3 Refrigerant Control Problems ] 8-3-3 Outdoor Units Stop at Irregular Times. 1. Phenomena Outdoor unit stops at times during operation. 2. Cause, check method and remedy Cause Check method and remedy The first stop is not considered as an error, as the Check the mode operated in the past by displaying unit turns to anti-restart mode for 3 minutes as a pre- preliminary error history on LED display with SW4.
  • Page 256: Checking Transmission Waveform And For Electrical Noise Interference

    [8-4 Checking Transmission Waveform and for Electrical Noise Interference ] Checking Transmission Waveform and for Electrical Noise Interference 8-4-1 M-NET Control is performed by exchanging signals between the outdoor unit and the indoor unit (ME remote controller) through M- NET transmission. Noise interference on the transmission line will interrupt the normal transmission, leading to erroneous op- eration.
  • Page 257 [8-4 Checking Transmission Waveform and for Electrical Noise Interference ] (3) Check method and remedy 1) Measures against noise Check the followings when noise exists on the wave or the errors described in (1) occur. Error code definition Remedy Check that the wiring 1.
  • Page 258 [8-4 Checking Transmission Waveform and for Electrical Noise Interference ] 8-4-2 MA Remote Controller The communication between the MA remote controller and the indoor unit is performed with current tone burst. (1) Symptoms caused by noise interference on the transmission line If noise is generated on the transmission line, and the communication between the MA remote controller and the indoor unit is interrupted for 3 minutes in a row, MA transmission error (6831) will occur.
  • Page 259: Pressure Sensor Circuit Configuration And Troubleshooting Pressure Sensor Problems

    [8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ] Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems 8-5-1 Comparing the High-Pressure Sensor Measurement and Gauge Pressure By configuring the digital display setting switch (SW4 (when SW6-10 is set to OFF)) as shown in the figure below, the pressure as measured by the high-pressure sensor appears on the LED1 on the control board.
  • Page 260 [8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ] 8-5-2 High-Pressure Sensor Configuration (63HS1, PS1, PS3) The high pressure sensor consists of the circuit shown in the figure below. If DC 5V is applied between the red and the black wires, voltage corresponding to the pressure between the white and the black wires will be output, and the value of this voltage will be converted by the microcomputer.
  • Page 261: Comparing The Low-Pressure Sensor Measurement And Gauge Pressure

    [8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ] 8-5-3 Comparing the Low-Pressure Sensor Measurement and Gauge Pressure By configuring the digital display setting switch (SW4 (when SW6-10 is set to OFF)) as shown in the figure below, the pressure as measured by the low-pressure sensor appears on the LED1 on the control board.
  • Page 262 [8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ] 8-5-4 Low-Pressure Sensor Configuration (63LS) The low pressure sensor consists of the circuit shown in the figure below. If DC5V is applied between the red and the black wires, voltage corresponding to the pressure between the white and the black wires will be output, and the value of this voltage will be converted by the microcomputer.
  • Page 263: Troubleshooting Solenoid Valve Problems

    [8-6 Troubleshooting Solenoid Valve Problems ] Troubleshooting Solenoid Valve Problems Check whether the output signal from the control board and the operation of the solenoid valve match. Setting the self-diagnosis switch (SW4) as shown in the figures below causes the ON signal of each relay to be output to the LED's. Each LED shows whether the relays for the following parts are ON or OFF.
  • Page 264: Troubleshooting Outdoor Unit Fan Problems

    [8-7 Troubleshooting Outdoor Unit Fan Problems ] Troubleshooting Outdoor Unit Fan Problems (1) Fan motor (common items) The number of revolutions of the outdoor fan is controlled by inverter. Check the number of revolutions of the fan while mon- itoring the inverter output indicated by the self-diagnosis LED. When starting the fan, the fan runs at full speed for 5 seconds.
  • Page 265: Troubleshooting Lev Problems

    [8-8 Troubleshooting LEV Problems ] Troubleshooting LEV Problems 8-8-1 General Overview on LEV Operation LEV operation LEV are stepping-motor-driven valves that operate by receiving the pulse signals from the indoor and outdoor unit control boards. (1) Outdoor LEV (LEV2a, 2b, and 2d), Indoor LEV and BC controller LEV The valve opening changes according to the number of pulses.
  • Page 266 [8-8 Troubleshooting LEV Problems ] 3) Pulse signal output and valve operation Output pulses change in the following orders when the Output Output state Valve is closed; 1 (phase) number Valve is open; *1. When the LEV opening angle does not change, all the output phases will be off.
  • Page 267 [8-8 Troubleshooting LEV Problems ] (2) Outdoor LEV (LEV4, LEV9) The valve opening changes according to the number of pulses. 1) Connections between the outdoor control board and LEV9 (outdoor expansion valve) Outdoor control board DC 12V Brown Drive circuit Blue Orange Yellow...
  • Page 268: Possible Problems And Solutions

    [8-8 Troubleshooting LEV Problems ] 8-8-2 Possible Problems and Solutions Malfunction Judgment method Remedy mode Microcomput- Disconnect the control board connector and connect the When the drive circuit Indoor unit, er driver circuit check LED as shown in the figure below. has a problem, replace Outdoor unit failure...
  • Page 269: Coil Removal Instructions

    [8-8 Troubleshooting LEV Problems ] 8-8-3 Coil Removal Instructions (1) Outdoor unit LEV (LEV4, LEV9) 1) Component As shown in the figure, the outdoor LEV is made in such a way that the coils and the body can be separated. Body Coils Stopper...
  • Page 270 [8-8 Troubleshooting LEV Problems ] (2) Outdoor unit LEV (LEV2a, 2b, and 2d) 1) Components The outdoor unit LEV consists of a coil and a valve body that can be separated from each other. Body Stopper Coil Lead wire 2) Removing the coil Securely hold the LEV at the bottom (as indicated by A in the figure), and turn the coil.
  • Page 271: Troubleshooting Problems With Major Components On Bc Controller

    [8-9 Troubleshooting Problems with Major Components on BC Controller ] Troubleshooting Problems with Major Components on BC Controller 8-9-1 Pressure Sensor Troubleshooting flow chart for pressure sensor START Note 1 Check whether the pressure sensor or the connectors of P1 and P3 are connected, properly Repair the fault.
  • Page 272 [8-9 Troubleshooting Problems with Major Components on BC Controller ] 1) BC controller: Phenomena when the pressure sensor is connected wrongly (reverse connection of P1 and P3) to the board. Symptoms Cooling-only Cooling-main Heating only Heating main Non-cooling Indoor heating SC small Normal Non-cooling SC11 large...
  • Page 273: Temperature Sensor

    [8-9 Troubleshooting Problems with Major Components on BC Controller ] 8-9-2 Temperature Sensor Troubleshooting instructions for thermistor START Note 1 Pull out the thermistor connector in trouble from the board. Note 2 Measure the temperature of the thermistor in trouble. (actual measurement value) Note 2 Check the thermistor resistor.
  • Page 274 [8-9 Troubleshooting Problems with Major Components on BC Controller ] 1) For the connectors on the board, TH11 and TH12 are connected to CN10, and TH15 and TH16 are connected to CN11. Dis- connect the connector in trouble, and check the sensor of each number. Pull out the sensor connector from the I/O board, Do not pull the sensor by holding the lead wire.
  • Page 275 [8-9 Troubleshooting Problems with Major Components on BC Controller ] Measurement data Symbol SW4 setting value SW6 setting value Bypass outlet TH12 temperature 9 10 9 10 Bypass inlet TH15 temperature (Sub 5) 9 10 9 10 Bypass inlet TH16 temperature 9 10 9 10...
  • Page 276 [8-9 Troubleshooting Problems with Major Components on BC Controller ] Measurement data Symbol SW4 setting value SW6 setting value Bypass outlet TH12 temperature 9 10 9 10 Bypass inlet TH15 temperature (Sub 10) 9 10 9 10 Bypass inlet TH16 temperature 9 10 9 10...
  • Page 277: Troubleshooting Flowchart For Levs

    [8-9 Troubleshooting Problems with Major Components on BC Controller ] 8-9-3 Troubleshooting Flowchart for LEVs No cooling capacity No heating capacity Note 1 Check whether the electric expansion valve and the solenoid valve connector are not disconnected or not loose. Repair the fault.
  • Page 278 [8-9 Troubleshooting Problems with Major Components on BC Controller ] 1) BC controller: Phenomena when LEV is connected wrongly (reverse connection of LEV1 and LEV3 or LEV4) to the board. Phenomena Cooling-only Cooling-main Heating only Heating main Non-cooling Non-cooling and non-heating Indoor heating SC small Non-cooling SH12 small, SC11 small...
  • Page 279 [8-9 Troubleshooting Problems with Major Components on BC Controller ] 4) Refer to the chart below to judge LEV opening controlled by the values of the differential pressure and of the superheat. (BC controller LEV basic operation characteristic) Malfunction Operation Standards of judgment on Part Content...
  • Page 280 [8-9 Troubleshooting Problems with Major Components on BC Controller ] Self-diagnosis LED Measurement data Symbol SW4 setting value SW6 setting value LEV1 opening 9 10 9 10 LEV3 opening 9 10 9 10 LEV4 opening (JA and KA only) 9 10 9 10 J, JA, KA (Standard...
  • Page 281 [8-9 Troubleshooting Problems with Major Components on BC Controller ] Troubleshooting Flowchart for LEV Start Check for pins not fully inserted on the connector and check the colors of the lead wires visually. Intermediate connector Control board When LEV is fully closed : tick sound When LEV is fully open : no sound Brown Brown...
  • Page 282: Troubleshooting Flowchart For Solenoid Valves

    [8-9 Troubleshooting Problems with Major Components on BC Controller ] 8-9-4 Troubleshooting Flowchart for Solenoid Valves (1) Solenoid valve (SVA, SVB, SVC) Faulty judgment of solenoid valve Stop the operation of the applied BC remote controller system. Stop the operation Check whether the wire to the solenoid valve is not connected wrongly, or the connector is not loose.
  • Page 283 [8-9 Troubleshooting Problems with Major Components on BC Controller ] Check whether the BC board output signal corresponds with the solenoid valve operation correspond. 1) SVA, SVB, SVC SVA, SVB, and SVC turn on or off according to the indoor unit operation mode. Mode Cooling Heating...
  • Page 284: Bc Controller Transformer

    [8-9 Troubleshooting Problems with Major Components on BC Controller ] 8-9-5 BC Controller Transformer BC controller control board CNTR CN03 White Normal Abnormal CNTR(1)-(3) about 58 . Open-phase or shorting CN03(1)-(3) about 1.6 . * Before measuring the resistance, pull out the connector. HWE18220_GB chapter 8 -...
  • Page 285: 8-10 Troubleshooting Inverter Problems

    [8-10 Troubleshooting Inverter Problems ] 8-10 Troubleshooting Inverter Problems 8-10-1 Inverter-Related Problems and Solutions Replace only the compressor if only the compressor is found to be defective. (Overcurrent will flow through the inverter if the compressor is damaged, however, the power supply is automatically cut when overcurrent is detected, protecting the inverter from damage.
  • Page 286 [8-10 Troubleshooting Inverter Problems ] Error display/failure condition Measure/inspection item Inverter related errors Implement solutions that correspond to the error codes or preliminary 4250, 4255, 4256, 4220, 4225, 4226, 4230, 4240, 4260, 5301, error codes. [7-1 Error Code and Preliminary Error Code Lists] 5305, 5306, 0403 Main power breaker trip Refer to the following page(s).
  • Page 287 [8-10 Troubleshooting Inverter Problems ] 8-10-2 Checking the Inverter Board Error Detection Circuit Items to be checked Phenomena Remedy Stop the unit. Overcurrent error Replace the INV board. Remove power supply. Error code: 4250 Detail code: No. 101, 104, 105, 106, and Disconnect the inverter Logic error Replace the INV board.
  • Page 288: Checking The Inverter For Damage At No-Load

    [8-10 Troubleshooting Inverter Problems ] 8-10-4 Checking the Inverter for Damage at No-Load Items to be checked Phenomena Remedy Stop the unit. Inverter-related problems are detected. Set SW7-1 on the MAIN board to ON, Remove power supply. and go to [8-10-2 Checking the Invert- er Board Error Detection Circuit].
  • Page 289: Checking The Fan Motor For Ground Fault And Coil Resistance Problems

    [8-10 Troubleshooting Inverter Problems ] 8-10-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems Items to be checked Phenomena Remedy Remove fan motor winding. Check Fan motor insulation failure. Change fan motor. insulation resistance and coil resis- If <...
  • Page 290: Checking The Fan Board For Damage With Load

    [8-10 Troubleshooting Inverter Problems ] 8-10-9 Checking the Fan Board for Damage with Load Items to be checked Phenomena Remedy Turn off breaker. The operation stops within 20 seconds Check for fan motor lock. of startup and a step-out error or an If locked, change for fan motor.
  • Page 291: Checking The Installation Conditions

    [8-10 Troubleshooting Inverter Problems ] 8-10-10 Checking the Installation Conditions Items to be checked Phenomena Remedy Check refrigerant charge. Overcharge of refrigerant Return to correct refrigerant charge. Check outdoor unit branch in- The branch approach <500 mm. Make branch approach >500mm stallation.
  • Page 292: Solutions For The Main Earth Leakage Breaker Trip

    [8-10 Troubleshooting Inverter Problems ] 8-10-12 Solutions for the Main Earth Leakage Breaker Trip Items to be checked Phenomena Remedy Check the earth leakage breaker Use of a non-specified earth Replace with a regulation earth leakage capacity and the sensitivity cur- leakage breaker breaker.
  • Page 293 [8-10 Troubleshooting Inverter Problems ] 8-10-13 Simple Check on Inverter Circuit Components Turn off the power to the unit, and leave it turned off for at least 10 minutes. Check that the voltage across pins 1 (+) and 5 (-) of the connector RYPN1 is 20 VDC or less before removing components from the control box. Part name Judgment method IGBT module...
  • Page 294: Troubleshooting Problems With Igbt Module

    [8-10 Troubleshooting Inverter Problems ] 8-10-14 Troubleshooting Problems with IGBT Module Measure the resistances between each pair of terminals on the IGBT with a tester, and use the results for troubleshooting. The terminals on the INV board are used for the measurement. 1) Notes on measurement Check the polarity before measuring.
  • Page 295 [8-10 Troubleshooting Inverter Problems ] <INV42Y> Reference resistance value Black (+) SC-P CN-N SC-L1 SC-L2 SC-L3L SC-P 5-200 5-200 5-200 CN-N Red (-) SC-L1 5-200 SC-L2 5-200 SC-L3 5-200 Black (+) SC-P1 CN-N SC-U SC-V SC-W SC-P1 5-200 5-200 5-200 CN-N Red (-) SC-U...
  • Page 296 [8-10 Troubleshooting Inverter Problems ] <INV38> Reference resistance value Black (+) SC-L1 SC-L2 SC-L3L SC-PL SC-N1 SC-L1 5-200 SC-L2 5-200 Red (-) SC-L3 5-200 SC-PL 5-200 5-200 5-200 SC-N1 Black (+) SC-P1L SC-N2 SC-D1 SC-D2 SC-D3 SC-P1L 5-200 5-200 5-200 SC-N2 Red (-) SC-D1...
  • Page 297: Checking The Fan Inverter Heatsink For Clogging

    [8-10 Troubleshooting Inverter Problems ] 8-10-15 Checking the Fan Inverter Heatsink for Clogging Check the fan inverter heatsink for clogging by removing part of the duct and checking inside the duct. To remove the duct, follow the procedures 1) through 2) below. Reassemble the components in the reverse order as they were removed.
  • Page 298: 8-11 Control Circuit

    [8-11 Control Circuit ] 8-11 Control Circuit 8-11-1 Control Power Supply Function Block 1) YNU AC power source (YNU: 460 VAC) Control system (5-30 VDC) Noise filter board Inverter board Noise filter Rectifier Smoothing capacitor Inverter Compressor AC Power source Fuse YNU: 460 VAC Fuse...
  • Page 299: Indoor Unit

    [8-11 Control Circuit ] 2) TNU AC power source (TNU: 208-230 VAC) Control system (5-30 VDC) Noise filter board Inverter board Capacitor board Noise filter Rectifier Smoothing capacitor Inverter Compressor AC Power source TNU: 208-230 VAC Fuse Fuse Power-supply terminal Inverter block drive circuit...
  • Page 300: Troubleshooting Problems With Outdoor Unit Transmission Power Supply Circuit

    [8-11 Control Circuit ] 8-11-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit 1) YNU Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. Check whether the transmission line is disconnected, 24-30 VDC check for contact failure, and repair the problem. Check the voltage at TB3 after removing transmission line from TB3.
  • Page 301 [8-11 Control Circuit ] Check for conductivity between TB11 and TB21 and between TB12 and TB22. Check TB11, TB12, TB21, TB22 on the noise Is there conductivity between them? filter for loose screws. Any loose Replace the noise filter screws? Check the wiring between the noise filter board and TB1 of power supply terminal block for proper connections.
  • Page 302 [8-11 Control Circuit ] 2) TNU Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. Check whether the transmission line is disconnected, 24-30 VDC check for contact failure, and repair the problem. Check the voltage at TB3 after removing transmission line from TB3.
  • Page 303 [8-11 Control Circuit ] Check for conductivity between TB12 and pin 3 of CN12 and between TB11 and pin 1 of CN12. Check TB11-TB23 on the noise filter for loose Is there conductivity between them? screws. Any loose Replace the noise filter screws? Check the wiring between the noise filter board and TB1 of power supply terminal block for proper...
  • Page 304: 8-12 Measures For Refrigerant Leakage

    [8-12 Measures for Refrigerant Leakage ] 8-12 Measures for Refrigerant Leakage 1. Leak spot: In the case of extension pipe for indoor unit (Cooling season) 1) Mount a pressure gauge on the service check joint (CJ2) on the low-pressure side. 2) Connect the service port on the high-pressure gas service valve (BV2) to that on the low-pressure gas service valve (BV1) using a charge hose.
  • Page 305 [8-12 Measures for Refrigerant Leakage ] (4) Close the ball valves (BV1 and BV2). (5) Collect the refrigerant that remains inside the outdoor unit. Do not discharge refrigerant into air into the atmosphere when it is collected. (6) Repair the leak. (7) After repairing the leak, replace the dryer with the new one, and perform evacuation inside the outdoor unit.
  • Page 306: 8-13 Parts Replacement Instructions

    [8-13 Parts Replacement Instructions ] 8-13 Parts Replacement Instructions 8-13-1 Ensuring Maintenance Space (Preparation for the Maintenance of Refrigerant Circuit Parts) (1) Remove the front panel from the unit by unscrewing the 14 screws. (See Figure 1.) *Figure 1 shows the unit without the front panel.
  • Page 307: Notes On Wiring Installation

    [8-13 Parts Replacement Instructions ] 8-13-2 Notes on Wiring Installation If wiring was disconnected during maintenance, reconnect the wiring as follows. Isolate the strong and the weak electrical wiring to avoid noise interference. FRONT VIEW CONTROL BOX Fix the wires in place with cable straps.
  • Page 308 [8-13 Parts Replacement Instructions ] 8-13-3 Four-way Valve Replacement Procedure (Applicable to four-way valves 21S4a and 21S4b) Explained below is the procedure for replacing four-way valve (21S4a) (on the left when seen from the front of the unit) and four-way valve (21S4b) (on the right when seen from the front of the unit). Secure sufficient work space before starting maintenance work.
  • Page 309 [8-13 Parts Replacement Instructions ] *Notes on replacing refrigerant circuit components (four-way valve, solenoid valve, and LEV) Be sure to perform non-oxidized brazing. Before heating the pipes, wrap the refrigerant circuit components with a wet towel to keep the temperature of the components from rising above 120°C.
  • Page 310 [8-13 Parts Replacement Instructions ] (9A) Remove four-way valve (21S4a) by removing the braze from the area above four-way valve (21S4a) as shown in Figure Remove the braze here. Four-way valve (21S4a) Figure 9 (10A) Mount a new four-way valve (21S4a). Figure 10 shows how to position a new four-way valve. Four-way valve (21S4a) Four-way valve (21S4b) When seen from above, four-way valves (21S4a and 21S4b) are...
  • Page 311 [8-13 Parts Replacement Instructions ] (13A) Install the pipe below four-way valve (21S4a) and in the middle by brazing at the three areas shown in Figure 13. Four-way valve (21S4a) Use the parts included with four-way valve (21S4a). Area to be brazed Figure 13 (14A) Install the pipe below four-way valve (21S4a) and on the front by brazing at the three areas shown in Figure 14.
  • Page 312 [8-13 Parts Replacement Instructions ] Replacement procedure for the four-way valve (21S4b) (15B) Cut the pipe below four-way valve (21S4b) and in the middle with a pipe cutter as shown in the figure. After cutting the pipe where indicated in the figure, remove the braze at the two areas shown in Figure 15. Four-way valve (21S4b) Four-way valve (21S4b) Remove the braze here.
  • Page 313 [8-13 Parts Replacement Instructions ] (18B) To make it easier to connect four-way valve (21S4b), cut the pipe between the section above four-way valve (21S4b) and the pipe bend with a pipe cutter. Cut the pipe with an expanded end that is included with four-way valve (21S4b) to the same length as the pipe that was removed from the on-site pipe.
  • Page 314 [8-13 Parts Replacement Instructions ] 8-13-4 Replacement Procedure for the Check Valve Block Assembly Explained below is the procedure for replacing the check valve block assembly. (1) Remove the top compressor cover by unscrewing the three screws. (See Figure 1.) Remove the compressor cover by unhooking the hooks on the back.
  • Page 315 [8-13 Parts Replacement Instructions ] (7) Cut the bands on the TH3 wiring, and remove the pipe covers and rubber spacer on the heat-exchanger side. (See Figure 7.) Rubber spacer and band Rubber spacer and band TH3 wiring, pipe cover Remove the pipe cover adjacent to the brazed area of the heat exchanger.
  • Page 316 [8-13 Parts Replacement Instructions ] (10) Remove the braze at the two areas circled in Figure 10 to remove SV2 assembly. (See Figure 10.) Remove the braze here. Remove the braze here. SV2 assembly Figure 10 (11) Cut the pipe with a pipe cutter at the area shown in Figure 11. Remove the braze at the area circled in Figure 11 to remove LEV4 assembly.
  • Page 317 [8-13 Parts Replacement Instructions ] (13) Cut the pipe below four-way valves (21S4a and 21S4b) with a pipe cutter as shown in the figure. Remove the braze at the areas circled in the figure to remove 21S4a and 21S4b assemblies. (2 areas to be cut. 5 areas to remove braze from.
  • Page 318 [8-13 Parts Replacement Instructions ] (14) Remove the braze from the pipe where circled in the figure, and unscrew the two screws on the check valve block fixing plate to remove the check valve block assembly. (2 areas to remove braze from. 2 screws to be removed. See Figure 14.) Check valve Check valve block...
  • Page 319 [8-13 Parts Replacement Instructions ] (17) To make it easier to connect four-way valves (21S4a and 21S4b), cut the pipes above four-way valves (21S4a and 21S4b) with a pipe cutter. Cut the pipe with an expanded end that is included with the check valve block assembly to the same length as the pipe that was removed from the on-site pipe.
  • Page 320 [8-13 Parts Replacement Instructions ] (19) Re-place the check valve assemblies (21S4a and 21S4b) whose pipes were replaced in step (16). (8 areas to be brazed. See Figure 19.) Area to be brazed Area to be brazed Four-way valve (21S4a) Four-way valve Four-way valve Four-way valve...
  • Page 321 [8-13 Parts Replacement Instructions ] 8-13-5 Compressor Replacement Procedure 1. HP72,HP96,HP120T/YNU-A Explained below are the procedures for replacing the compressor. Secure sufficient work space before starting replacement work. (See 8-13-1 Ensuring Maintenance Space (Preparation for the Maintenance of Refrigerant Circuit Parts).) (1) Remove the top compressor cover by unscrewing the three screws.
  • Page 322 [8-13 Parts Replacement Instructions ] (9) Remove the pipe cover and the damper, and cut the suction pipe where indicated in Figure 9. (10) Remove the pipe covers, and then remove the braze. (See Figure 10.) * Do not force the injection pipe to deform. (11) Remove the compressor discharge pipe by cutting the pipe where indicated in Figure 11 or by removing the braze.
  • Page 323: Removal Instructions For The Control Box

    [8-13 Parts Replacement Instructions ] 8-13-6 Removal Instructions for the Control Box 1. L module (1) YNU Explained below are the procedures for replacing the L module control boxes. Before replacement, perform the procedures described in "8-13-7 Transformer box replacement instructions 1. L module (YNU models only)." [Removing the duct] Unscrew the two screws indicated with arrows in Figure 1-a, and pull up the duct to remove it.
  • Page 324 [8-13 Parts Replacement Instructions ] (2) TNU [Removing the duct] Unscrew the two screws indicated with arrows in Figure 1-a, and pull up the duct to remove it. (Figure 1-b shows the unit after the duct was removed.) [Figure 1-a] [Figure 1-b] [Figure 1] [Removing the refrigerant cooling pipes]...
  • Page 325: Transformer Box Replacement Instructions

    [8-13 Parts Replacement Instructions ] 8-13-7 Transformer box replacement instructions 1. L module (YNU models only) (1) Ensure there is adequate work space. (See 8-13-1.) (2) Remove the control box cover. (5 screws as shown in Fig. 1.) (3) Unstrap the cable straps holding the transformer box wiring, and disconnect the wiring connectors and the grounding wire. (5 cable straps, 3 connectors, and 1 grounding screw as shown in Fig.
  • Page 326 [8-13 Parts Replacement Instructions ] (4) Unscrew the screw holding the transformer box, and move the box as shown in the figure. (3 screws as shown in Figure 3.) (5) Remove the transformer box. (Figure 4) Transformer box Figure 3 Figure 4 (6) Lift the transformer box to the position as shown in the figure, move the box to the designated position, and screw it down.
  • Page 327 [8-13 Parts Replacement Instructions ] 8-13-8 Maintenance Procedure for the Drain Pan [Drain pan removal procedure] (1) Remove the front panel from the unit by unscrewing the 14 screws. (See Figure 1.) (2) Remove the fin guard and the center pillar by unscrewing the 11 screws shown in Figure 2. Remove the cable straps from the center pillar.
  • Page 328 [8-13 Parts Replacement Instructions ] [Drain pan mounting procedure] *Reuse the drain pan mounting screws from the replaced drain pan. (M5 x 16 mm with a nylon washer) (1) Screw down the drain pan with two screws. (See Figure 7.) (2) Hold the check joints to the drain pan with two rod holders.
  • Page 329: Maintenance Procedures For The Heat Exchanger

    [8-13 Parts Replacement Instructions ] 8-13-9 Maintenance Procedures for the Heat Exchanger 1. L-module Rear heat exchanger Front of the unit Front heat exchanger Figure 1 (1) Remove the two front panels from the unit by unscrewing the 14 screws. (See Figure 2.) (2) Remove the fin guard by unscrewing the 12 screws.
  • Page 330 [8-13 Parts Replacement Instructions ] (9) Remove the fin guards and wiring covers from the right, left, and rear of the unit casing. (12 screws as shown in Figure 7.) Rear fin guard (sold separately) Right fin guard (sold separately) Left fin guard (sold separately) Left wiring cover Left wiring cover...
  • Page 331 [8-13 Parts Replacement Instructions ] (11) Remove the fan guard by unscrewing the 12 screws. (See Figure 9.) (12) Insert a spacer between the control box and the heat exchanger. (13) Remove the cable tie that is holding the motor ASSY and the unit wiring. Remove the motor ASSY by unscrewing the 16 screws, using caution not to disconnect the motor wiring or not to damage the fan.
  • Page 332 [8-13 Parts Replacement Instructions ] (18) To remove the front heat exchanger, first remove the front, left, right, and center frames by unscrewing the 14 screws. (See Figure 14.) To remove the rear heat exchanger, remove the rear frame in addition to the front, left, right, and center frames by unscrewing the 16 screws.
  • Page 333 [8-13 Parts Replacement Instructions ] (22) Before removing the front heat exchanger, protect the surrounding electrical components and the pipe cover with a recommended felt soaked in water, and then remove the braze from four areas. (See Figure 16) To remove the rear heat exchanger, remove the braze from four areas. (See Figure 17) Brazed area Brazed area Removal of the front heat exchanger...
  • Page 334 [8-13 Parts Replacement Instructions ] (23) To remove the front heat exchanger, loosen 4 screws on the right side of the right rear pillar. (See Figure 18.) To remove the rear heat exchanger, loosen 4 screws on the back of the right rear pillar. (See Figure 19.) Remove the screw holding the pillar to the rear heat exchanger support.
  • Page 335 [8-13 Parts Replacement Instructions ] (25) After removing the heat exchangers, dispose of the front and the rear heat exchanger supports. (See Figures 22 and 23.) The front and the rear heat exchanger supports do not need to be installed. (The front and the rear heat exchanger supports are for suppressing vibration during transportation.) Center pillar Front heat exchanger...
  • Page 336 [8-13 Parts Replacement Instructions ] 8-13-10 Accumulator Replacement Procedure 1. L-module (1) Remove the front heat exchanger. Refer to 8-13-9 Maintenance Procedures for the Heat Exchanger for details. (2) Remove the top, front, and right compressor covers. Refer to 8-13-5 Compressor Replacement Procedure for details. (3) Remove the duct from the control box.
  • Page 337 [8-13 Parts Replacement Instructions ] (8) Remove the braze at the four areas on the accumulator inlet and outlet pipes shown in Figure 7. Inlet pipe Suction pipe (Outlet pipe) Suction pipe Figure 7 (9) Re-place the accumulator in the reverse order as it was removed. Re-place the components that were removed as they were.
  • Page 338: 8-14 Bc Controller Maintenance Instructions

    [8-14 BC Controller Maintenance Instructions ] 8-14 BC Controller Maintenance Instructions 1. Service panel *Special care must be taken when replacing heavy parts. Work procedure Explanatory figure <KB type, J type, and 4-, 6-, 8-branch types> 1) Remove the control box by unscrewing the four fixing screws.
  • Page 339 [8-14 BC Controller Maintenance Instructions ] 3. Removing the drain pan Work procedure Explanatory figure 1) Remove the fixing screw on the long side of the bottom panel. Slide direction (Four places encircled by circles in Figure 1) 2) To prevent the bottom panel from falling, of the four screws indicated with triangles in Figure 1, only loosen (but not remove) the two screws that are diagonally lo- cated or on the opposite ends of the long side of the pan-...
  • Page 340 [8-14 BC Controller Maintenance Instructions ] 5. Pressure sensor Work procedure Explanatory figure (1) Remove the service panel. 1) See the right figure and the section [3-5 External Ap- SVM1 pearance and Refrigerant Circuit Components of BC Controller] for information on pressure sensors PS1 and PS3.
  • Page 341: Troubleshooting Problems Using The Led Status Indicators On The Outdoor Unit

    [8-15 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit ] 8-15 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit If the LED error display appear as follows while all the SW4 switches and SW6-10 are set to OFF, check the items under the ap- plicable item numbers below.
  • Page 342: Chapter 9 Usb Function

    Chapter 9 USB Function Service Overview ..........................1 9-1-1 Function Overview ..........................1 9-1-2 System Structure ............................ 2 9-1-3 Necessary Materials ..........................3 Operation Data Collection and Storage Functions................4 9-2-1 Preparation ............................. 4 9-2-2 Storing Data on a USB Memory Stick..................... 4 9-2-3 Collecting Operation Data........................
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  • Page 344: Service Overview

    [9-1 Service Overview ] 9 USB Function Service Overview 9-1-1 Function Overview The control board has a USB port that allows the use of the following two functions. 1. Collection and storage of operation data Operation information from indoor units, outdoor units, and other equipment and devices in the system are collected andstored in the flash memory in the control board of the outdoor unit (OC).
  • Page 345: System Structure

    [9-1 Service Overview ] 9-1-2 System Structure (1) Control board on the outdoor unit CN601 SWP3 Push switch (Function setting) Dip switch SW7-9 SW6-10 LED301 Maintenance LED CNUSB USB memory connector - chapter 9 HWE18220_GB...
  • Page 346: Necessary Materials

    [9-1 Service Overview ] 9-1-3 Necessary Materials The use of the USB function requires a USB memory stick and a portable battery charger. See below for the types of USB memory stick and portable charger that can be used. (1) USB memory stick Use a USB memory stick that meets the following specifications.
  • Page 347: Operation Data Collection And Storage Functions

    [9-2 Operation Data Collection and Storage Functions ] Operation Data Collection and Storage Functions Operation data of the units collected on the outdoor unit can be recorded in the flash memory of the control board. These data canalso be exported to and recorded in a USB memory stick. See Section [9-2-2 Storing Data on a USB Memory Stick] for information on storing data on a USB memory stick.
  • Page 348 [9-2 Operation Data Collection and Storage Functions ] [Method 2] Storing data on a USB memory stick with the main power to the outdoor unit turned on <Starting up the unit in the data storage mode> Stop the operation of all indoor units. *Although operation data can be collected without stopping all indoor units, doing so may be detected as a communication error.
  • Page 349: Collecting Operation Data

    [9-2 Operation Data Collection and Storage Functions ] 9-2-3 Collecting Operation Data This function is used to collect the operation data of the outdoor and indoor units via M-NET, and record the data in the flash memory on the control board. When the memory is full, it is overwritten from the first segment. The settings for checking the status of operation data collection, for starting/ending data collection, and for continuing/stop- ping error-data collection are made, using the switches on the control board.
  • Page 350: Precautions

    [9-2 Operation Data Collection and Storage Functions ] 9-2-4 Precautions For dealing with display on the maintenance LED and other problems, refer to Section [9-4 Maintenance LED Display and Troubleshooting]. 1. Storage of data in a USB memory stick Take extra care regarding electric shock during the work on the control board, such as the insertion of the USB memory stick. Before starting in Normal Mode, remove the USB memory stick from the control board.
  • Page 351: Software Rewrite Function On The Usb

    [9-3 Software Rewrite Function on the USB ] Software Rewrite Function on the USB The USB memory stick may be used to rewrite the software of the outdoor unit in the same way as using a ROM writer. 9-3-1 Preparation Prepare a USB memory stick and a portable battery charger.
  • Page 352: Precautions

    [9-3 Software Rewrite Function on the USB ] 9-3-3 Precautions For dealing with the displays shown on the maintenance LED and other problems, refer to Section [9-4 Maintenance LED Display and Troubleshooting] Take care to choose the correct countermeasure program for the intended model and version. Store only one software rewrite program on the USB memory stick.
  • Page 353: Maintenance Led Display And Troubleshooting

    [9-4 Maintenance LED Display and Troubleshooting ] Maintenance LED Display and Troubleshooting 9-4-1 Maintenance LED Display Content List The following table shows the maintenance LED displays for each function. When dealing with the errors shown on the display, refer to Section [9-4-2 Troubleshooting] 1.
  • Page 354 [9-4 Maintenance LED Display and Troubleshooting ] 2. Collecting operation data Switch Meaning Maintenance LED Display Description “ON” OC is collecting operation da- ta. A blinking display indicates that data collection is temporarily sus- Collection in progress pended. No switch setting is neces- sary.
  • Page 355 [9-4 Maintenance LED Display and Troubleshooting ] 3. Rewriting software Switch Meaning Maintenance LED Display Description “PRO” Software rewrite mode is ac- tive. Software rewrite is enabled. See Section [9-4-2 Troubleshoot- Rewrite Mode activated ing]3-(1), 3-(2) and 3- (3). Software rewrite is in progress. Bars are displayed in turn.
  • Page 356: Troubleshooting

    [9-4 Maintenance LED Display and Troubleshooting ] 9-4-2 Troubleshooting Troubleshooting of USB functions are shown below. The displays on the maintenance LED described in Section [9-4-1 Maintenance LED Display Content List]may also be used as a reference. 1. Storing on a USB memory stick (1) Maintenance LED does not display "USB."...
  • Page 357 [9-4 Maintenance LED Display and Troubleshooting ] (5) Maintenance LED displays "Er10." (Meaning or Cause) Because there was a problem regarding the control board during data storage, data storage is unfinished. (Solution) Perform data storage again. Remove the USB memory stick from the control board and insert it again. Then conduct data storage using Section [9-2-2 Storing Data on a USB Memory Stick]as a reference.
  • Page 358 [9-4 Maintenance LED Display and Troubleshooting ] 3. Rewriting software (1) Maintenance LED does not display "Pro." (Meaning or Cause) The system is not started in Software Rewrite Mode. Switches SW7-9 on the control board may not be in the ON position, or the portable charger may not be charged sufficiently. (Solution) Make sure switches SW7-9 are ON using Section [9-3-2 Rewriting Software]as a reference.
  • Page 359 [9-4 Maintenance LED Display and Troubleshooting ] (5) Maintenance LED displays "Er02." (Meaning or Cause) Software rewrite is suspended due to a problem with the USB memory stick during the software rewrite process. For example, if the USB memory stick is disconnected during data storage, this display appears on the maintenance LED. (Solution) Check the connection of the USB memory stick.
  • Page 360 Chapter 10 LED Status Indicators on the Outdoor Unit Circuit Board 10-1 LED Status Indicators........................... 1 10-1-1 How to Read the LED ..........................1 10-1-2 Initial LED Display........................... 2 10-1-3 Clock Memory Function .......................... 3 10-2 LED Status Indicators Table ........................ 4 HWE18220_GB...
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  • Page 362: 10-1 Led Status Indicators

    [10-1 LED Status Indicators ] 10 LED Status Indicators on the Outdoor Unit Circuit Board 10-1 LED Status Indicators 10-1-1 How to Read the LED By setting the DIP SW 4-1 through 4-10 (Set SW6-10 to OFF.)(Switch number 10 is represented by 0), the operating condition of the unit can be monitored on the service monitor.
  • Page 363: Initial Led Display

    [10-1 LED Status Indicators ] 10-1-2 Initial LED Display From power on until the completion of initial settings, the following information will be displayed on the monitor screen. (Displays No. 1 through No. 4 in order repeatedly.) Item Display Remarks Software version [0103] : Version 1.03 Refrigerant type...
  • Page 364: Clock Memory Function

    [10-1 LED Status Indicators ] 10-1-3 Clock Memory Function The outdoor unit has a simple clock function that enables the unit to calculate the current time with an internal timer by receiv- ing the time set by the system controller, such as AG-150A. If an error (including a preliminary error) occurs, the error history data and the error detection time are stored into the service memory.
  • Page 365: Led Status Indicators Table

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