Mitsubishi Electric PUHY-HP72 Service Handbook
  1. Manuals
  2. Brands
  3. Mitsubishi Electric Manuals
  4. Air Conditioner
  5. PUHY-HP72
  6. Service handbook

Mitsubishi Electric PUHY-HP72 Service Handbook

Hide thumbs
Table of Contents

Advertisement

Quick Links

Advertisement

Table of Contents
loading

Related Manuals for Mitsubishi Electric PUHY-HP72

Summary of Contents for Mitsubishi Electric PUHY-HP72

  • 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 injury from units falling rect current rating. The use of improperly or falling over, periodically check the instal- rated fuses or a substitution of fuses with lation base for damage.
  • Page 4 Any additional parts must be installed by Plastic bags pose suffocation hazard to the dealer or qualified personnel. Only use children. the parts specified by Mitsubishi Electric. Installation by unauthorized personnel or All drainage work should be performed by use of unauthorized parts or accessories...
  • Page 5 To reduce the risk of pipe damage, refriger- To prevent explosion, do not heat the unit ant leakage, and oxygen deprivation, use with refrigerant gas in the refrigerant circuit. pipes that meet the pipe thickness specifi- To reduce the risk of oxygen deprivation cations, which vary by the type of refriger- and gas poisoning, check for gas leakage ant used, pipe diameter, and pipe material.
  • Page 6 [6] Relocation and Repairs Relocation and Repairs To reduce the risk of refrigerant leakage, To reduce the risk of wire shorting, electric water leakage, injury, electric shock, and leak, electric shock, smoke, or fire, do not fire, units should only be moved or repaired perform maintenance work in the rain.
  • Page 7 Use refrigerant piping and couplings that To reduce the risk of both the breaker on the meet the applicable standards. For refriger- product side and the upstream breaker from ant pipes, use pipes made of phosphorus tripping and causing problems, split the deoxidized copper.

  • Page 8: 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 ......................... 11 Cautionary notes on installation environment and maintenance............ 13 Chapter 2 Restrictions System Configurations ..........................
  • Page 9 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 10 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 11 HWE18240_GB...

  • Page 12: 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 13: 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 14: 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 15: 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 16: 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 17: 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 18: 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 19: 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 20: 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 21: 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 22: 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 23 [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 24: 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 25 [1-5 Cautionary notes on installation environment and maintenance ] 14 - chapter 1 HWE18240_GB...

  • Page 26: Chapter 2 Restrictions

    Chapter 2 Restrictions System Configurations......................... 1 Types and Maximum Allowable Length of Cables................2 Switch Settings ............................. 3 M-NET Address Settings ........................4 2-4-1 Address Settings List ..........................4 2-4-2 Outdoor Unit Power Jumper Connector Connection................5 2-4-3 Outdoor Unit Centralized Controller Switch Setting ................5 2-4-4 Room Temperature Detection Position Selection ...................
  • Page 27 HWE18240_GB...

  • Page 28: 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 series Outdoor units Composing units Maximum total Maximum Types of connectable capacity of con-...

  • Page 29: 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 30: Switch Settings

    [2-3 Switch Settings ] 2) Remote controller wiring MA remote controller ME remote controller Type VCTF, VCTFK, CVV, CVS, VVR, VVF, VCT Shielded cables CVVS, CPEVS, and MVVS Number of 2-core cable 2-core cable cores Cable type 2 *3 0.3 to 1.25mm 2 *3 *5 0.3 to 1.25mm Cable size...

  • Page 31: 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 Address setting Setting method Facto-...

  • Page 32: Outdoor Unit Power Jumper Connector Connection

    [2-4 M-NET Address Settings ] 2-4-2 Outdoor Unit Power Jumper Connector Connection There are limitations on the total number of units that are connectable to each refrigerant system. Refer to the DATABOOK for details. System configu- Connection to Power supply unit Group operation Power supply switch connector connection ration...

  • Page 33: Start/Stop Control Of Indoor Units

    [2-4 M-NET Address Settings ] 2-4-5 Start/Stop Control of Indoor Units Each indoor unit (or group of indoor units) can be controlled individually by setting SW 1-9 and 1-10. *4 *5 Setting (SW1) Operation of the indoor unit when the operation is resumed after the unit was Function stopped Power ON/OFF by...

  • Page 34: 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 35 [2-4 M-NET Address Settings ] (1) CN51 (2) CN3S Outdoor unit External input Relay circuit adapter External input control board Distant control Relay circuit adapter 1 Outdoor unit board CN3S control board CN51 Preparations in the field Maximum cable Preparations length is 10m Maximum cable in the field...

  • Page 36: 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, OS1, and OS2). Between 2 and 12 steps of demand control is possible by setting DIP SW6-8 on the outdoor units (OC, OS1, and OS2). DipSW6-8 Demand control switch Input to CN3D *2...
  • Page 37 [2-5 Demand Control Overview ] (*3) 2) When SW6-8 on one outdoor unit in one refrigerant circuit system is set to ON (4 levels of on-DEMAND) CN3D 1-2P CN3D 1-3P Open Short-circuit Open 100% (No DEMAND) Short-circuit 0% (Compressor OFF) *3.

  • Page 38: 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 39: 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 Leave the male Group Group...
  • Page 40 [2-7 Example System with an MA Remote Controller ] od.) (4) Wiring method Group operation of indoor units 1) Indoor/outdoor transmission line To perform a group operation of indoor units (IC), daisy- Daisy-chain terminals M1 and M2 on the terminal block chain terminals 1 and 2 on the terminal block (TB15) on for indoor-outdoor transmission line (TB3) on the outdoor all indoor units (IC) in the same group, and then connect...

  • Page 41: 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 Leave the male Group Group connector on connector on connector on...
  • Page 42 [2-7 Example System with an MA Remote Controller ] 4) LOSSNAY connection (4) Wiring method Connect terminals M1 and M2 on the terminal block 1) Indoor/outdoor transmission line (TB5) on the indoor unit (IC) to the appropriate terminals Same as 2-7-1 on the terminal block (TB5) on LOSSNAY (LC).

  • Page 43: 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 Leave the male from CN41 to CN40. Group Group Group...
  • Page 44 [2-7 Example System with an MA Remote Controller ] a power failure, daisy-chain TB7 of OC, OS1, and OS2. (4) Wiring method (If there is a problem with the outdoor unit whose power 1) Indoor/outdoor transmission line jumper was moved from CN41 to CN40, centralized con- trol is not possible, even if TB7's are daisy-chained).

  • Page 45: 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 46 [2-7 Example System with an MA Remote Controller ] trol is not possible, even if TB7's are daisy-chained). (4) Wiring method c) When connecting TB7, only commence after checking 1) Indoor/outdoor transmission line that the voltage is below 20 VDC. Only use shielded cables.

  • Page 47: 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 Move the male connector Leave the male Leave the male from CN41 to CN40.
  • Page 48 [2-7 Example System with an MA Remote Controller ] same refrigerant circuit, connect the transmission line for (4) Wiring method centralized control to TB7 on the OC (Note a). To maintain centralized control even during an OC failure or a power fail- 1) Indoor/outdoor transmission line ure, daisy-chain TB7 of OC, OS1, and OS2.

  • Page 49: 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 from CN41 to CN40.
  • Page 50 [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 2-7-1 Performing a group operation (including the group operation of units in different refrigerant circuits).

  • Page 51: 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 Leave the male from CN41 to CN40.
  • Page 52 [2-9 Example System with an MA and an ME Remote Controller ] Same as 2-7-1 (4) Wiring method Group operation of indoor units 1) Indoor/outdoor transmission line Same as 2-7-1 Same as 2-7-1 4) ME remote controller wiring Shielded cable connection Same as 2-8-1 Same as 2-7-1 When 2 remote controllers are connected to the sys-...

  • Page 53: 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) HP72 - HP120 models Outdoor unit Branch header First branch (Branch joint) Indoor Indoor Indoor Branch joint Indoor Indoor Indoor Unit: m [ft] Allowable length of Operation Pipe sections...
  • Page 54 [2-10 Restrictions on Refrigerant Pipes ] (2) HP144 - HP240 models Provide a trap on the pipe (gas pipe only) within 2 m from the Note1 Install the pipe that connects the branch pipe and the outdoor units in joint pipe if the total length of the pipe that connects the joint the way that it has a downward inclination toward the branch pipe.
  • Page 55 [2-10 Restrictions on Refrigerant Pipes ] When the vertical separation between indoor units exceeds 15 m Outdoor unit above indoor unit example 1 example 2 Increase the size of the pipe indicated by Outdoor Outdoor Increase the size of the pipe indicated by Outdoor unit unit...

  • Page 56: Restrictions On Refrigerant Pipe Size

    [2-10 Restrictions on Refrigerant Pipes ] 2-10-2 Restrictions on Refrigerant Pipe Size (1) Diameter of the refrigerant pipe between the outdoor unit and the first branch (outdoor unit pipe size) Outdoor unit set name Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch] (total capacity) 72 model ø9.52 [3/8"]...
  • Page 57 [2-10 Restrictions on Refrigerant Pipes ] (3) Size of the refrigerant pipe between the branches for connection to indoor units Total capacity of the Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch] downstream units - 54 ø9.52 [3/8"] ø15.88 [5/8"] P55 - P72 ø9.52 [3/8"]...

  • Page 58: 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 59 HWE18240_GB...

  • Page 60: 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 PUHY-HP72, HP96, HP120T(Y)NU-A Fan guard Fan guard Fin guard Fin guard Heat exchanger...

  • Page 61: Outdoor Unit Refrigerant Circuits

    [3-1 External Appearance and Refrigerant Circuit Components of Outdoor Unit ] 3-1-2 Outdoor Unit Refrigerant Circuits PUHY-HP72, HP96, HP120T(Y)NU-A Check valve (CV1) Linear expansion valve (LEV1) Gas-liquid separator Subcool coil Low-pressure sensor (63LS) Oil separator High-pressure check joint (CJ1) High-pressure sensor...

  • Page 62: Outdoor Unit Refrigerant Circuit Diagrams

    [3-2 Outdoor Unit Refrigerant Circuit Diagrams ] Outdoor Unit Refrigerant Circuit Diagrams (1) PUHY-HP72-HP120T(Y)NU-A HWE18240_GB chapter 3 -...

  • Page 63: 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 64 [3-3 Functions of the Major Components of Outdoor Unit ] Part Symbols Notes Usage Specifications Check method name (functions) Thermis- 1) Detects discharge air temper- Degrees Celsius Resistance check (Discharge ature = 7.465k temperature) = 4057 2) Provides high-pressure pro- 25/120 tection 7.465...
  • Page 65 [3-3 Functions of the Major Components of Outdoor Unit ] Part Symbols Notes Usage Specifications Check method name (functions) Sole- SV1a 1) High/low pressure bypass at AC208-230V Continuity check noid Discharge- Open while being powered/ with a tester start-up and stopping, and valve suction closed while not being pow-...

  • Page 66: 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 Test with a expan- Opening of stepping motor Tester.
  • Page 67 [3-4 Functions of the Major Components of Indoor Unit ] - chapter 3 HWE18240_GB...

  • Page 68: 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 69 HWE18240_GB...

  • Page 70: 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 71 [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 72 [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 73: 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 74: 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 75: 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 76 [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 77: Fan Board

    [4-2 Outdoor Unit Circuit Board Components ] 4-2-4 Fan Board (1) YNU LED01 Lit: Inverter operation CNDCP 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 78 [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 79: 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 80 [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 81: 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 82 [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 83: Outdoor Unit Electrical Wiring Diagrams

    [4-3 Outdoor Unit Electrical Wiring Diagrams ] Outdoor Unit Electrical Wiring Diagrams (1) YNU 14 - chapter 4 HWE18240_GB...
  • Page 84 [4-3 Outdoor Unit Electrical Wiring Diagrams ] (2) TNU HWE18240_GB chapter 4 -...

  • Page 85: 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 86: 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 ................6 5-1-3 Remote Controller Switch Functions and Factory Settings..............7 Outdoor Unit Control ..........................9 5-2-1 Overview ..............................
  • Page 87 HWE18240_GB...

  • Page 88: 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 Function Switch setting timing switch setting (Note 2) Set to 00 or 51-100 with the dial Unit address setting...
  • Page 89 [5-1 Dipswitch Functions and Factory Settings ] Function according to switch setting Units that require Switch Function Switch setting timing switch setting (Note 2) Enables or disables the de- tection of the following types of inverter compres- sor errors ACCT, DCCT sensor er- ror(5301 Detail code 115, Error detection 116)
  • Page 90 [5-1 Dipswitch Functions and Factory Settings ] 1) Unless otherwise specified, leave the switch to OFF where indicated by "-," 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 91 [5-1 Dipswitch Functions and Factory Settings ] (2) Additional dipswitch settings at time of shipment Function according to switch setting Units that require Switch Function Switch setting timing switch setting OFF (LED3 Unlit) ON (LED3 Lit) (Note 2) 1-10 Self-diagnosis/operation SW6-10: Anytime after power on 1:ON, 0:OFF...
  • Page 92 [5-1 Dipswitch Functions and Factory Settings ] To change the settings, set SW6-10 to ON, set SW4, and press and hold SWP3 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 93: 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-VMH-F) model units...

  • Page 94: 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 95 [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 96: Outdoor Unit Control

    [5-2 Outdoor Unit Control ] Outdoor Unit Control 5-2-1 Overview The outdoor units are designated as OC, OS1 and OS2 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 97: Refrigerant Bypass Control

    [5-2 Outdoor Unit Control ] 5-2-5 Refrigerant Bypass Control (1) Bypass solenoid valve (SV1a) (ON = Open), (SV2) (ON = Open), (SV9) (ON = Open), (SV10, 11) (ON = Open) SV1a Operation When starting-up the compressor of each ON for 4 minutes. outdoor unit After the restoration of thermo or 3 minutes ON for 4 minutes.
  • Page 98 [5-2 Outdoor Unit Control ] SV10 Operation When Continuous heating Front part of heat exchanger is being de- Other than on the left mode frosted. When the rear part of heat exchanger is being defrosted, 21S4b will be OFF. HWE18240_GB chapter 5 -...

  • Page 99: 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 100: 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 101 [5-2 Outdoor Unit Control ] (2) Defrost operation Compressor frequency Model Compressor frequency Standard HP72 model 103 Hz HP96 model 113 Hz HP120 model 113 Hz Outdoor unit fan Stopped SV1a 21S4a 21S4b SV10 OFF (Closed) LEV1 0 pulses LEV2a, b 3000 pulses LEV4 0 pulses...

  • Page 102: 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). SW4 (848) must be set to ON to perform Continuous heating mode.

  • Page 103: Refrigerant Recovery Control

    [5-2 Outdoor Unit Control ] 5-2-9 Refrigerant Recovery Control Recovery of refrigerant is performed during heating operation to prevent the refrigerant from accumulating inside the unit while it is stopped (unit in fan mode), or inside the indoor unit that is in cooling mode or in heating mode with thermo off. It is also performed during cooling operation to prevent an excessive amount of refrigerant from accumulating in the outdoor heat exchanger.

  • Page 104: Subcool Coil Control (Linear Expansion Valve )

    [5-2 Outdoor Unit Control ] 5-2-11 Subcool Coil Control (Linear Expansion Valve <LEV1>) The OC, OS1, and OS2 controls the subcool coil individually. The LEV is controlled every 30 seconds to maintain constant the subcool at the outdoor unit heat exchanger outlet that is calculated from the values of high pressure (63HS1) and liquid piping temperature (TH3), or the superheat that is calculated from the values of low pressure (63LS) and the bypass outlet temperature (TH2) of the subcool coil.
  • Page 105 [5-2 Outdoor Unit Control ] (2) HP144 - HP240T(Y)SNU models 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 P250 or above. (*1 Qj The compressor on the OC starts up.

  • Page 106: Emergency Operation Mode

    [5-2 Outdoor Unit Control ] 5-2-16 Emergency Operation Mode 1. Problems with the outdoor unit Emergency operation mode is a mode in which outdoor units that are operating normally take over the operation of the out- door units that are experiencing problems. (HP144-HP240T(Y)SNU models go into an emergency operation mode when one outdoor unit is in trouble.) This mode can be started by performing an error reset via the remote controller.
  • Page 107 [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 108: Operation Mode

    [5-2 Outdoor Unit Control ] 5-2-17 Operation Mode (1) Indoor unit operation mode The operation mode can be selected from the following 5 modes using the remote controller. Cooling mode Heating mode Dry mode Fan mode Stopping mode (2) Outdoor unit operation mode Cooling mode All indoor units in operation are in cooling mode.
  • Page 109 [5-2 Outdoor Unit Control ] - chapter 5 HWE18240_GB...

  • Page 110: Chapter 6 Test Run

    Chapter 6 Test Run Read before Test Run........................... 1 Operation Characteristics and Refrigerant Charge ................2 Evaluating and Adjusting Refrigerant Charge ................... 2 6-3-1 Refrigerant Overcharge and undercharge ....................2 6-3-2 Checking the Refrigerant Charge during Operation................2 6-3-3 Maximum refrigerant charge ........................3 6-3-4 Refrigerant Charge Adjustment Mode ....................
  • Page 111 HWE18240_GB...

  • Page 112: 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 113: 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 114: Maximum Refrigerant Charge

    [6-3 Evaluating and Adjusting Refrigerant Charge ] 6-3-3 Maximum refrigerant charge There is a limit to the amount of refrigerant that can be charged into a unit. Observe the maximum refrigerant charge in the table below. HP72-240T(Y)(S)NU-A Total index of the outdoor units HP72 HP96 HP120...

  • Page 115: Refrigerant Charge Adjustment Mode

    [6-3 Evaluating and Adjusting Refrigerant Charge ] 6-3-4 Refrigerant Charge Adjustment Mode Follow the procedures below to add or extract refrigerant as necessary depending on the operation 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>...
  • Page 116 [6-3 Evaluating and Adjusting Refrigerant Charge ] Start Turn on SW4 (922) on the OC. Put all indoor units in the test run mode and run the units in cooling mode. Has the initial start-up mode been completed? Has it been at least 30 minutes since start up? Gradually add refrigerant from...

  • Page 117: 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 118: 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 119 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 [5102,5103,5104,5105,5106,5107,5115]................
  • Page 120 7-9-7 Error Code [7111] ..........................70 7-9-8 Error Code [7113] ..........................71 7-9-9 Error Code [7117] ..........................72 7-9-10 Error Code [7130] ..........................73 HWE18240_GB...
  • Page 121 HWE18240_GB...

  • Page 122: 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 0403 4305 Serial communication error (page 6)
  • Page 123 [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 4230 4330 4235 4335 [125] Heatsink overheat protection (page 30) 4236 4336 4240 Overload protection (YNU) (page 31) 4245 4340...
  • Page 124 [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 HIC circuit outlet tempera- 5106 1216 Temperature sensor fault (page 39) ture (TH6) 5107 1221 Temperature sensor fault Outside temperature (TH7)
  • Page 125 [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 MA remote controller signal transmission error (Hard- 6833 (page 60) ware error) MA controller signal reception error (Start bit detection 6834 (page 61) error)
  • Page 126 [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 com- pressor 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 compressor inverter system The last digit Inverter system...

  • Page 127: 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 128: 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 129: Error Code Definitions And Solutions: Codes [1000 - 1999]

    [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 above operation (the first detection), the outdoor unit stops once, turns to anti-restart mode for 3 minutes, and restarts after 3 minutes automatically.

  • Page 130: Error Code [1301]

    [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 131: 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 132: Error Code [1302] (At Startup)

    [7-3 Error Code Definitions and Solutions: Codes [1000 - 1999] ] 7-3-4 Error Code [1302] (at startup) 1. Error code definition High pressure fault 2 (Outdoor unit) 2. Error definition and error detection method If the pressure of 0.098MPa [14psi] or lower is registered on the pressure sensor immediately before start-up, it will trigger an abnormal stop, and error code "1302"...

  • Page 133: 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 134: 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 135: 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 136: 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 137: 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 138: 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 139: 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 140: 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 141 [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 142: 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 143: 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 144: 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 145 [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 146: 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 147 [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 148 [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 149 [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 150 [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 151 [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 152: 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 153 [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 154 [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 155 [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 156: 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 157 [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 158: 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, INV38 100 C...

  • Page 159: 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 160: Error Codes [5102,5103,5104,5105,5106,5107,5115]

    [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-2 Error Codes [5102,5103,5104,5105,5106,5107,5115] 1. Error code definition 5102 HIC bypass circuit outlet temperature sensor (TH2) fault (Outdoor unit) 5103 Heat exchanger outlet temperature sensor (TH3) fault (Outdoor unit) 5104 Discharge temperature sensor (TH4) fault (Outdoor unit) 5105...

  • Page 161: 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 162 [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-5 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 163 [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-7 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 164 [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-9 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 165 [7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ] 7-7-11 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 166: 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 167: Error Code [6600]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-3 Error Code [6600] 1. Error code definition Address overlap 2. Error definition and error detection method An error in which signals from more than one indoor units with the same address are received Detail code 001: Detection of overlapped address in centralized control system Detail code 002: Detection of overlapped address in indoor unit system The address and attribute that appear on the remote controller indicate the controller that detected the error.

  • Page 168: Error Code [6606]

    [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 169 [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 170: 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 171: Error Code [6607] Error Source Address = Indoor Unit (Ic)

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-9 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 172 [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 173: Error Code [6607] Error Source Address = Lossnay (Lc)

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-10 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 174: Error Code [6607] Error Source Address = Me Remote Controller

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-11 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 175: Error Code [6607] Error Source Address = System Controller

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-12 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 176: Error Code [6607] All Error Source Addresses

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-13 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 177: Error Code [6607] No Error Source Address

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-14 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 178: Error Code [6608]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-15 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 179: Error Code [6832]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-16 Error Code [6831] 1. Error code definition MA 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 180: Error Code [6834]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-17 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 181: Error Code [6841]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-18 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 182: Error Code [6843]

    [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-19 Error Code [6834] 1. Error code definition MA 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 183 [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-20 Error Code [6840] 1. Error code definition Indoor/outdoor unit communication 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 184 [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-22 Error Code [6842] 1. Error code definition A control communication transmission/reception hardware trouble 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 185 [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-23 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 186 [7-8 Error Code Definitions and Solutions: Codes [6000 - 6999] ] 7-8-24 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 187: 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 188: 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 189: 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 190: 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 3. Cause, check method and remedy Error source Cause Check method and remedy...

  • Page 191: Error Code [7113]

    [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-6 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 192: Error Code [7130]

    [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-8 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 193 [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-9 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 194 [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] 7-9-10 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 with different refrigerant systems are connected. 3.
  • Page 195 [7-9 Error Code Definitions and Solutions: Codes [7000 - 7999] ] - chapter 7 HWE18240_GB...
  • Page 196 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 197 8-11 Measures for Refrigerant Leakage ....................50 8-12 Parts Replacement Instructions ......................52 8-12-1 Ensuring Maintenance Space (Preparation for the Maintenance of Refrigerant Circuit Parts)..... 52 8-12-2 Notes on Wiring Installation ........................53 8-12-3 Four-way Valve and Check Valve Replacement Procedure ..............54 8-12-4 Compressor Replacement Procedure....................

  • Page 198: 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 199: 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 200: 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 201: 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 202: 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 203: 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 204: 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 205 [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 206: 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 207: 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 208 [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 209: 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 210 [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 211: 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 212: 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 213 [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 214: Ma Remote Controller

    [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 215: 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 216: High-Pressure Sensor Configuration (63Hs1)

    [8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems ] 8-5-2 High-Pressure Sensor Configuration (63HS1) 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 217: 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 218: Low-Pressure Sensor Configuration (63Ls)

    [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 219: 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 figure 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 220 [8-6 Troubleshooting Solenoid Valve Problems ] (3) SV1a (Bypass valve) This solenoid valve opens when powered (Relay ON). 1) At compressor start-up, the SV1a turns on for 4 minutes, and the operation can be checked by the self-diagnosis LED display and the closing sound.

  • Page 221: Troubleshooting Outdoor Unit Fan Problems

    [8-7 Troubleshooting Outdoor Unit Fan Problems ] Troubleshooting Outdoor Unit Fan Problems (1) Fan motor (common items) To check the revolution of the fan, check the inverter output state on the self-diagnosis LED, as the inverter on the outdoor fan controls the revolutions of the fan. When starting the fan, the fan runs at full speed for 5 seconds.

  • Page 222: Troubleshooting Lev Problems

    [8-8 Troubleshooting LEV Problems ] Troubleshooting LEV Problems 8-8-1 General Overview on LEV Operation LEV (Indoor unit: Linear expansion valve) and LEV2 (Outdoor unit: Linear expansion valve) are stepping-motor-driven valves that operate by receiving the pulse signals from the indoor and outdoor unit control boards. (1) Indoor LEV and Outdoor LEV (LEV2) The valve opening changes according to the number of pulses.
  • Page 223 [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 224 [8-8 Troubleshooting LEV Problems ] (2) Outdoor LEV (LEV1, LEV4, and LEV9) The valve opening changes according to the number of pulses. 1) Connections between the outdoor control board and LEV1 (outdoor expansion valve) Outdoor control board DC 12V Brown Drive circuit Blue Orange...

  • Page 225: Possible Problems And Solutions

    [8-8 Troubleshooting LEV Problems ] 8-8-2 Possible Problems and Solutions The specifications of the outdoor unit (outdoor LEV) and the indoor unit (indoor LEV) differ. Therefore, remedies for each fail- ure may vary. Check the remedy specified for the appropriate LEV as indicated in the below column. Malfunction Judgment method Remedy...

  • Page 226: Coil Removal Instructions

    [8-8 Troubleshooting LEV Problems ] 8-8-3 Coil Removal Instructions (1) Outdoor unit LEV (LEV1, LEV4, and LEV9) 1) LEV 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 227 [8-8 Troubleshooting LEV Problems ] (2) Outdoor unit LEV (LEV2a, LEV2b) 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 228: Troubleshooting Inverter Problems

    [8-9 Troubleshooting Inverter Problems ] Troubleshooting Inverter Problems 8-9-1 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 229 [8-9 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 230: Checking The Inverter Board Error Detection Circuit

    [8-9 Troubleshooting Inverter Problems ] 8-9-2 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 231: Checking The Inverter For Damage During Compressor Operation

    [8-9 Troubleshooting Inverter Problems ] 8-9-5 Checking the Inverter for Damage during Compressor Operation Items to be checked Phenomena Remedy Put the outdoor unit into opera- Overcurrent-related problems occur im- Check items [8-9-2 Checking the tion. mediately after compressor startup. Inverter Board Error Detection Cir- Check the inverter output volt- Error code : 4250...

  • Page 232: Checking The Fan Board Error Detection Circuit At No Load

    [8-9 Troubleshooting Inverter Problems ] 8-9-7 Checking the Fan Board Error Detection Circuit at No Load Items to be checked Phenomena Remedy Stop the unit. An error other than current sensor er- Replace the fan board. Turn off the breaker. ror (5305, 5306: Detail code 135) is *Be sure to turn off the power.

  • Page 233: Checking The Fan Board For Damage With Load

    [8-9 Troubleshooting Inverter Problems ] 8-9-9 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 234: Checking The Installation Conditions

    [8-9 Troubleshooting Inverter Problems ] 8-9-10 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 235: Solutions For The Main Earth Leakage Breaker Trip

    [8-9 Troubleshooting Inverter Problems ] 8-9-12 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 236: Simple Check On Inverter Circuit Components

    [8-9 Troubleshooting Inverter Problems ] 8-9-13 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 237: Troubleshooting Problems With Igbt Module

    [8-9 Troubleshooting Inverter Problems ] 8-9-14 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 238 [8-9 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 239 [8-9 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 240: Checking The Fan Inverter Heatsink For Clogging

    [8-9 Troubleshooting Inverter Problems ] 8-9-15 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 241: 8-10 Control Circuit

    [8-10 Control Circuit ] 8-10 Control Circuit 8-10-1 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 Compressor Smoothing capacitor Inverter AC Power source Fuse YNU: 460 VAC Fuse...

  • Page 242: Indoor Unit

    [8-10 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 243: Troubleshooting Problems With Outdoor Unit Transmission Power Supply Circuit

    [8-10 Control Circuit ] 8-10-2 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 244 [8-10 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 245 [8-10 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 246 [8-10 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 247: 8-11 Measures For Refrigerant Leakage

    [8-11 Measures for Refrigerant Leakage ] 8-11 Measures for Refrigerant Leakage 1. Leak spot: In the case of extension pipe for indoor unit or optional unit (Cooling season) 1) Mount a pressure gauge on the service check joint (CJ2) on the low-pressure side. 2) Stop all the indoor units, and close the liquid service valve (BV2) inside the outdoor unit while the compressor is stopped.
  • Page 248 [8-11 Measures for Refrigerant Leakage ] (8) After repairing the leak, replace the dryer with the new one, and perform evacuation inside the outdoor unit and optional unit. (9) To adjust refrigerant amount, open the service valves (BV1 and BV2 when optional unit is in- stalled) inside the outdoor unit.

  • Page 249: 8-12 Parts Replacement Instructions

    [8-12 Parts Replacement Instructions ] 8-12 Parts Replacement Instructions 8-12-1 Ensuring Maintenance Space (Preparation for the Maintenance of Refrigerant Circuit Parts) 1. L-module (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 250: Notes On Wiring Installation

    [8-12 Parts Replacement Instructions ] 8-12-2 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. (1) L-module FRONT VIEW Fix the wires in place with CONTROL BOX cable straps.

  • Page 251: Four-Way Valve And Check Valve Replacement Procedure

    [8-12 Parts Replacement Instructions ] 8-12-3 Four-way Valve and Check Valve Replacement Procedure 1. L-module (four-way valve (21S4a)) Explained below is the procedure for replacing four-way valve (21S4a) (on the right when seen from the front of the unit). Secure sufficient work space before starting maintenance work. (See 8-12-1 Ensuring Maintenance Space (Preparation for the Maintenance of Refrigerant Circuit Parts).) (1) Remove the top compressor cover by unscrewing the three screws.
  • Page 252 [8-12 Parts Replacement Instructions ] (6) Remove the plastic cover and the coil holding the four-way valve. (See Figure 6.) Four-way valve coil A Figure 6 *Notes on replacing refrigerant circuit components (check valve, four-way valve, solenoid valve, and LEV) Be sure to perform non-oxidized brazing.
  • Page 253 [8-12 Parts Replacement Instructions ] (10A) Remove the pipe below four-way valve (21S4a) and on the front by removing the braze at the four areas shown in Figure 10. After being removed, leave the pipes at the bottom inside the unit. (Once removed from the unit, it will be Remove the rubber spacer.
  • Page 254 [8-12 Parts Replacement Instructions ] (13A) Remove four-way valve (21S4a) by removing the braze from the area above four-way valve (21S4a) as shown in Figure Figure 13 (14A) Mount a new four-way valve (21S4a). Figure 14 shows how to position a new four-way valve. When seen from above, four-way valves (21S4a and 21S4b) are tilted by 15°.
  • Page 255 [8-12 Parts Replacement Instructions ] (17A) Mount four-way valve (21S4a) to the pipe below four-way valve A and in the middle by brazing at the three areas. (See Figure 17.) Figure 17 (18A) Mount four-way valve (21S4a) to the pipe below four-way valve (21S4a) and on the front by brazing at the four areas. (See Figure 18.) Reinstall these pipes.
  • Page 256 [8-12 Parts Replacement Instructions ] 2. L-module (four-way valve (21S4b)) Explained below is the procedure for replacing four-way valve (21S4b) (on the left when seen from the front of the unit). Secure sufficient work space before starting maintenance work. (See 8-12-1 Ensuring Maintenance Space (Preparation for the Maintenance of Refrigerant Circuit Parts).) (19B) Follow the same procedures ((1) through (7), (8A), and (11A)) for replacing four-way valve (21S4a).
  • Page 257 [8-12 Parts Replacement Instructions ] (23B) Mount four-way valve (21S4b) to the pipe below four-way valve (21S4b) and in the middle. A total of five areas require brazing, including the area indicated in (22B) and the areas indicated in Figure 22. Mount four-way valve (21S4b) horizontal to four-way valve (21S4a) as shown in (14A).
  • Page 258 [8-12 Parts Replacement Instructions ] 3. Replacing check valve (CV1) (L module) Follow the procedures below to remove check valve (CV1) located in the back of the four-way valve. (1) Follow the steps (1) through (9A) under item 1. L-module under 8-12-3 Four-way Valve and Check Valve Replacement Procedure to Create Access to Check Valve (CV1).

  • Page 259: Compressor Replacement Procedure

    [8-12 Parts Replacement Instructions ] 8-12-4 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 8-12-1 Ensuring maintenance space (Preparation for the Maintenance of Refrigerant Circuit Parts).) (1) Remove the top compressor cover by unscrewing the three screws.
  • Page 260 [8-12 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 261: Removal Instructions For The Control Box

    [8-12 Parts Replacement Instructions ] 8-12-5 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 "8-12-6 Transformer box replacement instructions 2. 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 262 [8-12 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 263: Transformer Box Replacement Instructions

    [8-12 Parts Replacement Instructions ] 8-12-6 Transformer box replacement instructions 1. L module (YNU models only) (1) Ensure there is adequate work space. (See 8-12-1.) (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 264 [8-12 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 (4) Lift the transformer box to the position as shown in the figure, move the box to the designated position, and screw it down.

  • Page 265: Maintenance Procedure For The Drain Pan

    [8-12 Parts Replacement Instructions ] 8-12-7 Maintenance Procedure for the Drain Pan 1. L-module [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 266 [8-12 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 267: Maintenance Procedures For The Heat Exchanger

    [8-12 Parts Replacement Instructions ] 8-12-8 Maintenance Procedures for the Heat Exchanger 1. L-module Rear heat exchanger Trans box (YNU) 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 268 [8-12 Parts Replacement Instructions ] (9) Remove the fin guards and wiring covers from the right, left, and rear of the unit casing. (24 screws as shown in Figure 7.) Right fin guard Rear fin guard Left fin guard Left wiring cover Rear wiring cover Left wiring cover Right wiring cover...
  • Page 269 [8-12 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 eight screws, using caution not to disconnect the motor wiring or not to damage the fan.
  • Page 270 [8-12 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 271 [8-12 Parts Replacement Instructions ] (22) Before removing the front heat exchanger, protect the adjacent electrical components and the pipe covers with the recommended felt that is soaked in water, and then remove the braze from the areas shown in Figure 16. (Standard front heat exchanger: 4 areas) To remove the rear heat exchanger, remove the braze from four areas.
  • Page 272 [8-12 Parts Replacement Instructions ] (23) To remove the front heat exchanger, loosen the screws on the right side of the right rear pillar. (4 screws on a standard model) (See Figure 18.) To remove the rear heat exchanger, loosen the screws on the back of the right rear pillar. (4 screws on a standard model) (See Figure 19.) Remove the screw holding the pillar to the rear heat exchanger support.
  • Page 273 [8-12 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 274: Accumulator Replacement Procedure

    [8-12 Parts Replacement Instructions ] 8-12-9 Accumulator Replacement Procedure 1. L-module (1) Remove the front heat exchanger. Refer to 8-12-8 Maintenance Procedures for the Heat Exchanger for details. (2) Remove the top, front, and right compressor covers. Refer to 8-12-4 Compressor Replacement Procedure for details. (3) Remove the duct from the control box.
  • Page 275 [8-12 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) S-module suction pipe L-module 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 276: Troubleshooting Problems Using The Led Status Indicators On The Outdoor Unit

    [8-13 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit ] 8-13 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 277 [8-13 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit ] - chapter 8 HWE18240_GB...

  • Page 278: 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........................
  • Page 279 HWE18240_GB...

  • Page 280: 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 281: 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 HWE18240_GB...

  • Page 282: 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 283: 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 284 [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 285: 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 286: 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 287: 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 288: 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 289: 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 290 [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 291 [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 292: 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 293 [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 294 [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 295 [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 296 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 HWE18240_GB...
  • Page 297 HWE18240_GB...

  • Page 298: 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 299: 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 300: 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 301: Led Status Indicators Table

    [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 302 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 303 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 304 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 305 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 306 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 307 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 308 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 309 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 310 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 311 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 312 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 313 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 314 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 315 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 316 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 317 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 318 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 319 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 320 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 321 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...
  • Page 322 [10 - 2 LED Status Indicators Table] HWE18240_GB chapter 10 -...
  • Page 323 [10 - 2 LED Status Indicators Table] - chapter 10 HWE18240_GB...

This manual is also suitable for:

Puhy-hp192Puhy-hp120tnu-aPuhy-hp240tsnu-aPuhy-hp96Puhy-hp240tysnu-aPuhy-hp120tynu-a ... Show all

Table of Contents