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Mitsubishi Electric City Multi PUHY-P500YSHM-A Service Handbook

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Summary of Contents for Mitsubishi Electric City Multi PUHY-P500YSHM-A

  • Page 2 Safety Precautions Before installing the unit, thoroughly read the following safety precautions. Observe these safety precautions for your safety. WARNING This symbol is intended to alert the user to the presence of important instructions that must be followed to avoid the risk of serious injury or death.
  • Page 3 WARNING Securely attach the terminal block cover (panel) to the After completing the service work, check for a gas unit. leak. If the terminal block cover (panel) is not installed properly, If leaked refrigerant is exposed to a heat source, such as a dust and/or water may infiltrate and pose a risk of electric fan heater, stove, or electric grill, poisonous gases may be shock, smoke, and/or fire.
  • Page 4 Precautions for handling units for use with R410A CAUTION Do not use the existing refrigerant piping. Use a vacuum pump with a reverse-flow check valve. A large amount of chlorine that may be contained in the re- If a vacuum pump that is not equipped with a reverse-flow sidual refrigerant and refrigerating machine oil in the exist- check valve is used, the vacuum pump oil may flow into the ing piping may cause the refrigerating machine oil in the...
  • Page 5 Before installing the unit WARNING Do not install the unit where a gas leak may occur. When installing the unit in a hospital, take appropriate measures to reduce noise interference. If gaseous refrigerant leaks and piles up around the unit, it may be ignited.
  • Page 6 Before installing the unit (moving and reinstalling the unit) and performing electrical work CAUTION Properly ground the unit. Periodically check the installation base for damage. Do not connect the grounding wire to a gas pipe, water pipe, If the unit is left on a damaged platform, it may fall and lightning rod, or grounding wire from a telephone pole.
  • Page 7 Before the test run CAUTION Turn on the unit at least 12 hours before the test run. Do not operate the unit without panels and safety guards. Keep the unit turned on throughout the season. If the unit is turned off in the middle of a season, it may result in malfunc- Rotating, high-temperature, or high-voltage parts on the unit tions.

  • Page 8: Table Of Contents

    CONTENTS I Read Before Servicing [1] Read Before Servicing......................3 [2] Necessary Tools and Materials ....................4 [3] Piping Materials ........................5 [4] Storage of Piping ........................7 [5] Pipe Processing........................7 [6] Brazing............................8 [7] Air Tightness Test........................9 [8] Vacuum Drying (Evacuation) ....................
  • Page 9 CONTENTS XI LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor ..............189 HWE07150...
  • Page 10 I Read Before Servicing [1] Read Before Servicing ....................... 3 [2] Necessary Tools and Materials..................4 [3] Piping Materials ......................... 5 [4] Storage of Piping ....................... 7 [5] Pipe Processing ......................... 7 [6] Brazing..........................8 [7] Air Tightness Test ......................9 [8] Vacuum Drying (Evacuation) ...................
  • Page 11 - 2 -...

  • Page 12: Read Before Servicing

    [ I Read Before Servicing ] I Read Before Servicing [1] Read Before Servicing 1. Check the type of refrigerant used in the system to be serviced. Refrigerant Type Inverter air conditioner new refrigerant series for facilities: R410A 2. Check the symptoms exhibited by the unit to be serviced. Refer to this service handbook for symptoms relating to the refrigerant cycle.

  • Page 13: Necessary Tools And Materials

    [ I Read Before Servicing ] [2] Necessary Tools and Materials 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.

  • Page 14: Piping Materials

    [ I Read Before Servicing ] Tools recommended for replacing parts for changing the indoor unit static air pressure When replacing a motor or pulley, work can be performed easier by using tools of dimensions close to the following specifications. Extension bar Ratchet handle/9.5mm [3/8"] [3] Piping Materials...
  • Page 15 [ I Read Before Servicing ] 4. Thickness and refrigerant type indicated on the piping materials Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant. 5. Flare processing (O-material (Annealed) and OL-material only) The flare processing dimensions for the pipes that are used in the R410A system are larger than those in the R22 system. Flare processing dimensions (mm[in]) A dimension (mm) Pipe size (mm[in])

  • Page 16: Storage Of Piping

    [ I Read Before Servicing ] [4] Storage of Piping 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 17: Brazing

    [ I Read Before Servicing ] [6] 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 oxidized solder for brazing Use of non-oxidized solder for brazing 1.

  • Page 18: Air Tightness Test

    [ I Read Before Servicing ] [7] 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 19: Vacuum Drying (Evacuation)

    [ I Read Before Servicing ] [8] Vacuum Drying (Evacuation) (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 20: Refrigerant Charging

    [ I Read Before Servicing ] [9] 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 21: Characteristics Of The Conventional And The New Refrigerants

    [ I Read Before Servicing ] [11] Characteristics of the Conventional and the New 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 22: Notes On Refrigerating Machine Oil

    [ I Read Before Servicing ] [12] Notes on Refrigerating Machine 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. Refrigerant Refrigerating machine oil Mineral oil...
  • Page 23 - 14 -...

  • Page 24: Restrictions

    II Restrictions [1] System configuration ....................... 17 [2] Types and Maximum allowable Length of Cables ............17 [3] Switch Settings and Address Settings ................18 [4] An Example of a System to which an MA Remote Controller is connected..... 24 [5] Restrictions on Pipe Length .....................
  • Page 25 - 16 -...

  • Page 26: System Configuration

    [ II Restrictions ] II Restrictions [1] System configuration 1. Table of compatible indoor units Do not connect the indoor unit to an outdoor unit other than the PUHY-P500YSHM-A. Be sure to connect the indoor unit and outdoor unit on a one-to-one basis. Indoor Unit Model Names Outdoor Unit Model Names PFAV-P500VMH-E...

  • Page 27: Switch Settings And Address Settings

    [ II Restrictions ] 1) M-NET transmission line Facility All facility types type Type Shielded cable CVVS, CPEVS, MVVS Cable type Number of 2-core cable cores Cable size Larger than 1.25mm [AWG16] Maximum transmission line distance between the 200 m [656ft] max. outdoor unit and the far- thest indoor unit Maximum transmission...
  • Page 28 [ II Restrictions ] 2. 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 Symbol Address setting Setting method Facto- range ry set- ting Indoor unit...
  • Page 29 [ II Restrictions ] (2) Power supply switch connector connection on the outdoor unit (Factory setting: The male power supply switch connector is connected to CN41.) System configu- Connection to Power supply unit Group operation Power supply switch connector connection ration the system con- for transmission...
  • Page 30 [ II Restrictions ] (6) Various types of control using input-output signal connector on the outdoor unit (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 31 [ II Restrictions ] Example of wiring connection CN51 CN3S Outdoor unit Relay circuit Adapter 2 control board Distant control Relay circuit Adapter 1 board Outdoor unit CN3S control board CN51 Preparations in the field Maximum cable Preparations length is 10m Maximum cable in the field X : Relay...
  • Page 32 [ II Restrictions ] 1) SW4-4: OFF (Compressor ON/OFF, Low-noise mode) CN3D 1-3P Compressor ON/OFF Open Compressor ON Short-circuit Compressor OFF CN3D 1-2P Low-noise mode Open Short-circuit *1. When SW4-4 on the outdoor unit in one refrigerant circuit system is set to ON , this function cannot be used. *2.

  • Page 33: An Example Of A System To Which An Ma Remote Controller Is Connected

    [ II Restrictions ] [4] An Example of a System to which an MA Remote Controller is connected 1. System using MA remote controller PFAV-P500VMH-E and PUHY-P500YSHM-A (1) Sample control wiring M1M2 M1M2 M1M2 M1M2 A B S TB15 (Main) (Sub) (1) Cautions * Set the connected MA remote controller to the sub re-...
  • Page 34 [ II Restrictions ] (2) Sample control wiring (Different refrigerant group operation) CN41 as it is CN41 as it is Group TB15 M1M2 M1M2 M1M2 M1M2 A1 B2 MA(body) Main CN41 as it is CN41 as it is TB15 M1M2S M1M2 M1M2 M1M2...
  • Page 35 [ II Restrictions ] (3) Sample control wiring (When PFAV-P500VMH-E and PUHY-P500YSHM-A system (connect the system controller to the transmission cable for the centralized control)) CN41 as it is CN41 CN40 Replace SW2-1 OFF SW2-1 OFF * Supply power from the outdoor unit to the central controller Group TB 15...

  • Page 36: Restrictions On Pipe Length

    [ II Restrictions ] [5] Restrictions on Pipe Length (1) End branching Outdoor unit 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 37 - 28 -...

  • Page 38: Outdoor Unit Components

    III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit ............31 [2] Control Box of the Outdoor Unit..................33 [3] Outdoor Unit Circuit Board....................34 - 29 - HWE07150...
  • Page 39 - 30 -...

  • Page 40: Outdoor Unit Components And Refrigerant Circuit

    [ III Outdoor Unit Components ] III Outdoor Unit Components [1] Outdoor Unit Components and Refrigerant Circuit 1. Front view of an outdoor unit (PUHY-P250YHM-A) Fan guard Control Heat exchanger Front panel Fin guard - 31 - HWE07150...
  • Page 41 [ III Outdoor Unit Components ] 2. Refrigerant circuit (PUHY-P250YHM-A) High pressure sensor(63HS1) Low pressure sensor(63LS) Check valve 4-way valve(21S4b) 4-way valve(21S4a) High-pressure switch(63H1) High pressure check joint Accumulator Low pressure check joint Subcool coil Linear Expansion Compressor cover Valve(LEV1) Solenoid valve(SV5b) Compressor Oil separator...

  • Page 42: Control Box Of The Outdoor Unit

    [ III Outdoor Unit Components ] [2] Control Box of the Outdoor Unit <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 43: Outdoor Unit Circuit Board

    [ III Outdoor Unit Components ] [3] Outdoor Unit Circuit Board 1. Outdoor unit control board (PUHY-P250YHM-A) CN332 CNDC Serial communication signal input  Output 18VDC CN801 Bus voltage input GND INV board Pressure switch  GND Output 17VDC   （Fan board） connection Serial communication signal output CNAC2...
  • Page 44 [ III Outdoor Unit Components ] 2. M-NET board CNS2 CNIT Transmission line input/output for Input 12VDC CN04 centralized control system CN102 Bus voltage input Input 5VDC Power supply output for centralized control system Power supply detection output Indoor/outdoor transmission line input/output Power supply ON/OFF Grounding signal input...
  • Page 45 [ III Outdoor Unit Components ] 3. INV board SC-P1 Rectifier diode output (P) Open: No-load operation setting CN5V RSH1 SC-P2 Short-circuited: Normal setting LED1 Overcurrent detection Bus voltage Input(P) Lit: Inverter in normal operation Output 5VDC resistor Blink: Inverter error GND(INV Board) Serial communication signal output...
  • Page 46 [ III Outdoor Unit Components ] 4. Fan board LED3 CN18V  GND Lit during normal  Input 18VDC  Serial communication signal output CPU operation  GND   GND （Control board）  Serial communication signal output CN21  Serial communication signal output  GND （INV board） CNVDC  Input 17VDC Bus voltage input CN22...
  • Page 47 [ III Outdoor Unit Components ] 5. Noise Filter Output Output (Rectified L2-N current) (Rectified L2-N current) Surge absorber circuit Surge absorber circuit Short circuit Short circuit Grounding F1,F2,F3,F4 Fuse 250VAC 6.3A Output Grounding CN1A Input CN1B TB21 TB22 TB23 TB24 Input Input/output （L1）...

  • Page 48: Indoor Unit Structure

    IV Indoor Unit Structure [1] External View ........................41 [2] Control Box ........................42 [3] Board ..........................43 [4] Fan........................... 44 - 39 - HWE07150...
  • Page 49 - 40 -...

  • Page 50: External View

    [ IV Indoor Unit Structure ] IV Indoor Unit Structure [1] External View PFAV-P500VMH-E - 41 - HWE07150...

  • Page 51: Control Box

    [ IV Indoor Unit Structure ] [2] Control Box PFAV-P500VMH-E Terminal block (TB5) for transmission and Control board I.B. Auxiliary relay (4) terminal block (TB15) for MA remote controller CN90 CN3A CN28 Auxiliary relay 52F PFAV-P500VMH Thermal over current relay 51F Power terminal block Power transformer T - 42 -...

  • Page 52: Board

    [ IV Indoor Unit Structure ] [3] Board Indoor control board CN3A MA remote controller CN28 CN33 transmission cable defrost output fan error input CN90 power output CN60 and CN7V fan output (to transformer) power input LEV outputs CN31 F901 drain sensor input fuse Thermistor input...

  • Page 53: Fan

    [ IV Indoor Unit Structure ] [4] Fan Use the following procedure to replace the pulley and motor of the PFAV-P500VMH-E. 1. Replacement Procedure Electric motor base slide bolt Electric motor base securing bolts (1) Attaching the fan pulley set and electric motor pulley set 1) Remove the front lower and upper panels (2 screws for each).

  • Page 54: Remote Controller

    V Remote Controller [1] Functions and Specifications of MA Remote Controller........... 47 [2] Interlock Settings via the MA Remote Controller ............. 48 [3] Using the built-in Temperature Sensor on the Remote Controller ........49 - 45 - HWE07150...
  • Page 55 - 46 -...

  • Page 56: Functions And Specifications Of Ma Remote Controller

    [ V Remote Controller ] V Remote Controller [1] Functions and Specifications of MA Remote Controller 1. Functions and specifications Functions/specifications MA remote controller Remote controller address settings Not required Indoor/outdoor unit address set- Required tings Wiring method Non-polarized 2-core cable ∗To perform a group operation, daisy- chain the indoor units using non-polar- ized 2-core cables.

  • Page 57: Interlock Settings Via The Ma Remote Controller

    [ V Remote Controller ] [2] Interlock Settings via the MA Remote Controller 1. LOSSNAY interlock setting (Make this setting only when necessary.) Make this setting only when necessary. Perform this operation to enter the interlock setting between the LOSSNAY and the indoor units to which the remote controller is connected, or to search and delete registered information.

  • Page 58: Using The Built-In Temperature Sensor On The Remote Controller

    [ V Remote Controller ] < 2. Search Procedures > To search for the LOSSNAY unit that is interlocked with a particular indoor unit, enter the address of the indoor unit into the remote controller that is connected to it. <Indoor unit address>...
  • Page 59 - 50 -...

  • Page 60: Electrical Wiring Diagram

    VI Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit ..............53 [2] Electrical Wiring Diagram of Transmission Booster............54 [3] Electrical Wiring Diagram of the Indoor Unit ..............55 - 51 - HWE07150...
  • Page 61 - 52 -...

  • Page 62: Electrical Wiring Diagram Of The Outdoor Unit

    [ VI Electrical Wiring Diagram ] VI Electrical Wiring Diagram [1] Electrical Wiring Diagram of the Outdoor Unit 1. Electrical wiring diagram of the outdoor unit (1) PUHY-P250 model - 53 - HWE07150...

  • Page 63: Electrical Wiring Diagram Of Transmission Booster

    [ VI Electrical Wiring Diagram ] [2] Electrical Wiring Diagram of Transmission Booster Terminal block for power supply (TB1) 250V 5A Red Red Red Black White White Green/Yellow 100V/200VAC Varistor Noise filter Black White White White White Green Black Stabilized power supply Blue Black Grounding...

  • Page 64: Electrical Wiring Diagram Of The Indoor Unit

    [ VI Electrical Wiring Diagram ] [3] Electrical Wiring Diagram of the Indoor Unit 1. Electrical wiring diagram of the indoor unit (1) PFAV-P500VMH-E - 55 - HWE07150...
  • Page 65 - 56 -...

  • Page 66: Refrigerant Circuit

    VII Refrigerant Circuit [1] Refrigerant Circuit Diagram ..................... 59 [2] Principal Parts and Functions ..................60 - 57 - HWE07150...
  • Page 67 - 58 -...

  • Page 68: Refrigerant Circuit Diagram

    [ VII Refrigerant Circuit ] VII Refrigerant Circuit [1] Refrigerant Circuit Diagram 1. Outdoor unit (1) PUHY-P250 model 21S4b 21S4a 63H1 63HS1 63LS SV1a COMP SV5b LEV2a LEV1 SCC(HIC Circuit) LEV2b 2. Indoor unit (1) PFAV-P500VMH-E model Flow of refrigerant Cooling Heating Distributor...

  • Page 69: Principal Parts And Functions

    [ VII Refrigerant Circuit ] [2] Principal Parts and Functions 1. Outdoor unit Part Symbols Notes Usage Specifications Check method name (functions) Com- Adjusts the amount of circulating Low-pressure shell scroll pressor (Comp1) refrigerant by adjusting the operat- compressor ing frequency based on the oper- Wirewound resistance ating pressure data 20°C[68°F] : 0.981ohm...
  • Page 70 [ VII Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Ther- 1) Detects discharge air temper- Degrees Celsius Resistance mistor (Discharge) check ature = 7.465k = 4057 2) Provides high-pressure pro- 25/120 tection 7.465 4057 0°C[32°F] :698kohm 10°C[50°F] :413kohm 20°C[68°F] :250kohm 30°C[86°F] :160kohm...
  • Page 71 [ VII Refrigerant Circuit ] Part Symbols Notes Usage Specifications Check method name (functions) Linear LEV1 Adjusts the amount of bypass flow DC12V Same as in- expan- (SC control) from the liquid pipe on the outdoor Opening of a valve driven by a door LEV sion unit during cooling...
  • Page 72 [ VII Refrigerant Circuit ] 2. Indoor Unit Part Symbol Notes Usage Specification Check method Name (functions) Linear 1) Adjusts superheat at the DC12V Refer to the section expan- Opening of stepping motor "Continuity Test with a indoor heat exchanger sion valve driving valve 0-1400 pulses Tester".
  • Page 73 - 64 -...

  • Page 74: Control

    VIII Control [1] Functions and Factory Settings of the Dipswitches ............67 [2] Controlling the Outdoor Unit .................... 71 [3] Operation Flow Chart....................... 81 - 65 - HWE07150...
  • Page 75 - 66 -...

  • Page 76: Functions And Factory Settings Of The Dipswitches

    [ VIII Control ] VIII Control [1] Functions and Factory Settings of the Dipswitches 1. Outdoor unit (1) Control board Units that re- quire switch Function according to switch setting Switch setting timing setting Switch Function Note.2 Unit address setting Set to 00 or 51-100 with the dial switch Before power on For self-diagnosis/...
  • Page 77 [ VIII Control ] Units that re- quire switch Function according to switch setting Switch setting timing setting Switch Function Note.2 Test run mode: en- SW3-2 disabled SW3-2 enabled Anytime after power on abled/disabled Test run mode: ON/ Sends a test-run After power on and when Stops all ICs signal to all IC...
  • Page 78 [ VIII Control ] Units that re- quire switch Function according to switch setting Switch setting timing setting Switch Function Note.2 Model selection See the table below (Note 4) Before being energized Low-noise mode Capacity priority Low-noise priority selection Before being energized mode (Note 3) mode Model selection...
  • Page 79 [ VIII Control ] 2. Function of the switch (Indoor unit) (1) Dipswitches 1) SW1, 3, 7, 8 2) SW2, SW3-2, SW3-9, SW3-10, SW4 Model System Capacity SW3-2 SW3-9 SW3-10 P500 <About the Capacity Code and Model Setting> If the capacity code or model is incorrectly set because, for example, the board was replaced, reset the power of both the indoor unit and outdoor unit.

  • Page 80: Controlling The Outdoor Unit

    [ VIII Control ] [2] Controlling the Outdoor Unit -1- Outline of Control Method The outdoor units are designated as OC and OS in the order of capacity from large to small (if two or more units have the same capacity, in the order of address from small to large). The OC determines the operation mode and the control mode, and it also communicates with the indoor units.
  • Page 81 [ VIII Control ] -5- Bypass Control Bypass solenoid valves (SV1a), which bypass the high- and low- pressure sides, perform the following functions. (1) Bypass solenoid valve (SV1a) (ON = Open), (SV9) (ON = Open) SV1a Operation When starting-up the compressor of each ON for 4 minutes.
  • Page 82 [ VIII Control ] -6- Compressor Frequency Control The evaporation temperature is varied during cooling operation and the condensing temperature is varied during heating op- eration depending on the capacity required. The table below summarizes the operating frequency ranges of the inverter compressor during normal operation. The OS in the multiple-outdoor-unit system operates at the actual compressor frequency value that is calculated by the OS based on the preliminary compressor frequency value that the OC determines.
  • Page 83 [ VIII Control ] -7- Defrost Operation Control (1) Starting the defrost operation The defrost operation starts when the pipe temperature (TH3) has continuously been detected to be at -10°C [14°F] or below for 3 minutes after the integrated compressor operation time exceeds 50 minutes (if the defrost prohibit timer is set to 90 min- utes, the actual defrost prohibit time for the next operation will be 90 minutes).
  • Page 84 [ VIII Control ] (3) Stopping the defrost operation The defrost operation ends when 12 minutes have passed since the beginning of the defrost operation or when the pipe tem- perature (TH3) has been continuously detected to be at 10°C [50°F] or above for 4 minutes. Defrost operation will not stop its operation for 2 minutes once started unless the piping temperature exceeds 25°C [77°F] within 2 minutes, in which case the operation will stop.
  • Page 85 [ VIII Control ] (2) During cooling operation Starting refrigerant recovery mode The refrigerant recovery mode starts when all the following conditions are met: 30 minutes have passed since the completion of previous refrigerant recovery. When the unit keeps running for 3 minutes in a row or more with high discharge temperature TH4 >...
  • Page 86 [ VIII Control ] 1. Flowchart of initial operation (1) P500 model Initial startup mode starts. The compressor on the OC starts up. 60Hz *1 Qj:Total capacity (models) code Refer to the " Control - 2. Function of the switch (Indoor unit) - (1) Dipswitches- 2) SW2" (page 85) for the capacity code.
  • Page 87 [ VIII Control ] -13- Emergency Operation Mode 1. Problems with the outdoor unit Emergency operation mode is a temporary operation mode in which the outdoor unit that is not in trouble operates when one of the outdoor units is in trouble. This mode can be started by performing an error reset via the remote controller.
  • Page 88 [ VIII 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 89 [ VIII Control ] (3) Ending the emergency operation When communication is restored, the emergency mode is cancelled, and the units go into the normal operation mode. -14- Operation Mode (1) Indoor unit operation mode The operation mode can be selected from the following 4 modes using the remote controller. Cooling mode Heating mode Fan mode...

  • Page 90: Operation Flow Chart

    [ VIII Control ] [3] Operation Flow Chart 1. Mode determination flowchart (1) Indoor unit (cooling, heating, fan mode) Start Normal operation Error Breaker Unit in the stopped state turned on From outdoor unit Operation SW turned on 1. Protection function self-holding cancelled.
  • Page 91 [ VIII Control ] (2) Outdoor unit (cooling and heating modes) Start Normal operation Error Breaker Unit in the stopped state turned on "HO" / "PLEASE WAIT" blinks on the remote controller *Note 1 Indoor units registered to the remote controller From indoor unit Operation command...
  • Page 92 [ VIII Control ] 2. Operations in each mode (1) Cooling operation Cooling operation Normal operation During test run mode 4-way valve OFF Unit in the stopped state Indoor unit fan *Note 1 operation Test run mode Thermostat ON 3-minute restart prevention 1.
  • Page 93 [ VIII Control ] (2) Heating operation Normal operation Defrost operation Heating operation Unit in the stopped state *Note 1,2 During test run mode Defrost operation 4-way valve ON 4-way valve OFF 1. Indoor unit fan stops 2. Inverter defrost frequency control Test run mode 3.

  • Page 94: Test Run Mode

    IX Test Run Mode [1] Items to be checked before a Test Run ................87 [2] Test Run Method ......................88 [3] Operating Characteristic and Refrigerant Amount ............89 [4] Adjusting the Refrigerant Amount ..................89 [5] Refrigerant Amount Adjust Mode..................92 [6] The following symptoms are normal.
  • Page 95 - 86 -...

  • Page 96: Items To Be Checked Before A Test Run

    [ IX Test Run Mode ] IX Test Run Mode [1] Items to be checked before a Test Run (1) Check for refrigerant leak and loose cables and connectors. (2) Measure the insulation resistance between the power supply terminal block and the ground with a 500V megger and make sure it reads at least 1.0Mohm.

  • Page 97: Test Run Method

    [ IX Test Run Mode ] [2] Test Run Method The figure shows an MA remote controller (PAR-21MAA). ON/OFF button Set Temperature buttons Down Fan Speed button TIME SUN MON TUE WED THU FRI SAT TIMER AFTER AFTER ERROR CODE FUNCTION FILTER WEEKLY...

  • Page 98: Operating Characteristic And Refrigerant Amount

    [ IX Test Run Mode ] [3] Operating Characteristic and Refrigerant Amount 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. 1.
  • Page 99 [ IX Test Run Mode ] 3. Amount of refrigerant to be added The amount of refrigerant that is shown in the table below is factory-charged to the outdoor units. The amount necessary for extended pipe (field piping) is not included and must be added on site. Outdoor unit model P250 Amount of pre-charged refrigerant in...
  • Page 100 [ IX Test Run Mode ] (2) Example: Outdoor unit PUHY-P500YSHM-A, Indoor unit PFAV-P500VMH-E 9.52[3/8"] 9.52[3/8"] (3m)[9 ft] (1m)[3 ft] Liquid separetor Indoor 15.88[3/4"] (30m)[98 ft] (3) Sample calculation All the pipes in the figure are liquid pipes. 15.88 : 30 m 9.52 : 3 m + 1m = 4 m According to the above formula Amount of refrigerant to be charged (kg) = (0.2 X 30) + (0.06 X 4) + 5.0 = 11.24 kg...

  • Page 101: Refrigerant Amount Adjust Mode

    [ IX Test Run Mode ] [5] Refrigerant Amount Adjust Mode 1. Procedures Follow the procedures below to add or extract refrigerant as necessary depending on the operation mode. When the function switch (SW4-3) on the main board on the outdoor unit (OC only) is turned to ON, the unit goes into the refrigerant amount adjust mode, and the following sequence is followed.
  • Page 102 [ IX Test Run Mode ] Start Turn on SW4-3 on the OC. Put all indoor units in the test run mode *Refer to the previous page for *Notes 1-4 in the chart. and run the units in cooling mode. Has the initial start-up mode been completed? Has it been at least...

  • Page 103: The Following Symptoms Are Normal

    [ IX Test Run Mode ] [6] 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 are performing a cooling (heating) operation.

  • Page 104: Standard Operation Data (Reference Data)

    [ IX Test Run Mode ] [7] Standard Operation Data (Reference Data) (1) Cooling operation Outdoor unit model Operation PUHY-P500YSHM-A Ambient Indoor 27°C/19°C [81°F/66°F] tempera- DB/WB Outdoor ture 35°C/ - [95°F/ - ] Operating Main pipe 7.5 [24-3/5] conditions Piping Branch pipe m [ft] Total pipe length...
  • Page 105 [ IX Test Run Mode ] (2) Heating operation Outdoor unit model Operation PUHY-P500YSHM-A Ambient Indoor 20°C/ - [68°F/ - ] tempera- DB/WB Outdoor ture 7°C/6°C [45°F/43°F] Operating Main pipe 7.5 [24-3/5] conditions Piping Branch pipe m [ft] Total pipe length 7.5 [24-3/5] Electric current 27.6...

  • Page 106: Troubleshooting

    X Troubleshooting [1] Error Code Lists ....................... 99 [2] Responding to Error Display on the Remote Controller..........102 [3] Investigation of Transmission Wave Shape/Noise............159 [4] Troubleshooting Principal Parts ..................162 [5] Refrigerant Leak ......................181 [6] Compressor Replacement Instructions................183 [7] Troubleshooting Using the Outdoor Unit LED Error Display..........
  • Page 107 - 98 -...

  • Page 108: Error Code Lists

    [ X Troubleshooting ] X Troubleshooting [1] Error Code Lists Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code 4300 0403 Serial communication error 4305 (Note) 0900 Test run 1102 1202 Discharge temperature fault 1301 Low pressure fault 1302...
  • Page 109 [ X Troubleshooting ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code Indoor unit pipe tempera- ture (TH22) Temperature sensor OA processing unit pipe 5102 1217 fault temperature (TH2) HIC bypass circuit outlet temperature (TH2) Indoor unit gas-side pipe temperature (TH23)
  • Page 110 [ X Troubleshooting ] Searched unit Error Prelimi- (prelim- Error nary inary) Error code definition Notes Code error detail code code 6608 No response error MA controller signal reception error (No signal re- 6831 ception) MA remote controller signal transmission error 6832 (Synchronization error) MA remote controller signal transmission error...

  • Page 111: Responding To Error Display On The Remote Controller

    [ X Troubleshooting ] [2] Responding to Error Display on the Remote Controller 1. Error Code 0403 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 01: Between the control board and the INV board Detail code 05: Between the control board and the Fan board...
  • Page 112 [ X Troubleshooting ] 1. Error Code 1102 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 113 [ X Troubleshooting ] 1. Error Code 1301 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. 3.
  • Page 114 [ X Troubleshooting ] 1. Error Code 1302 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 115 [ X Troubleshooting ] 1. Error Code 1302 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 116 [ X Troubleshooting ] 1. Error Code 2500 Drain sensor submergence (Models with a drain sensor) 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 117 [ X Troubleshooting ] 1. Error Code 2500 Drain sensor submergence (Models with a float switch) 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 118 [ X Troubleshooting ] 1. Error Code 2502 Drain pump fault (Models with a drain sensor) 2. Error definition and error detection method 1) Make the drain sensor thermistor self-heat. If the temperature rise is small, it is interpreted that the sensor is immersed in water.
  • Page 119 [ X Troubleshooting ] 1. Error Code 2502 Drain pump fault (Models with a float switch) 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 120 [ X Troubleshooting ] 1. Error Code 2503 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 121 [ X Troubleshooting ] 1. Error Code 2600 Water leakage 2. Cause, check method and remedy Check that water does not leak from the pipes in such as the humidifier. 1. Error Code 2601 Water supply cutoff 2. Cause, check method and remedy Cause Check method and remedy The water tank of the humidifier is empty.
  • Page 122 [ X Troubleshooting ] 1. Error Code 4102 Open phase 2. Error definition and error detection method An open phase of the power supply (L1 phase, N phase) was detected at power on. The L3 phase current is outside of the specified range. The open phase of the power supply may not always be detected if a power voltage from another circuit is applied.
  • Page 123 [ X Troubleshooting ] 1. Error Code 4106 <Transmission power supply fault error detail FF (Outdoor unit)> 2. Error definition and error detection method Transmission power output failure 3. Cause 1) Wiring failure 2) Transmission power supply cannot output voltage because overcurrent was detected. 3) Voltage cannot be output due to transmission power supply problem.
  • Page 124 [ X Troubleshooting ] 1. Error Code 4115 Power supply signal sync error 2. Error definition and error detection method The frequency cannot be determined when the power is switched on. 3. Cause, check method and remedy Cause Check method and remedy Power supply error Check the voltage of the power supply terminal block (TB1).
  • Page 125 [ X Troubleshooting ] 1. Error Code 4220 4225 Abnormal bus voltage drop (Detail code 108) 2. Error definition and error detection method If Vdc 289V or less is detected during Inverter operation. (S/W detection) 3. Cause, check method and remedy (1) Power supply environment Check whether the unit makes an instantaneous stop when the detection result is abnormal or a power failure occurs.
  • Page 126 [ X Troubleshooting ] 1. Error Code 4220 4225 Abnormal bus voltage rise (Detail code 109) 2. Error definition and error detection method If Vdc 830V is detected during inverter operation. 3. Cause, check method and remedy (1) Different voltage connection Check the power supply voltage on the power supply terminal block (TB1).
  • Page 127 [ X Troubleshooting ] 1. Error Code 4220 4225 Low bus voltage at startup (Detail code 131) 2. Error definition and error detection method When Vdc 160 V is detected just before the inverter operation. 3. Cause, check method and remedy (1) Inverter main circuit failure Same as detail code 108 of 4220 error Refer to section - 6 - "Inverter"...
  • Page 128 [ X Troubleshooting ] 1. Error Code 4240 Overload protection 2. Error definition and error detection method If the output current of "(Iac) >Imax (Arms)" or "THHS > 95°C [203°F] " is continuously detected for 10 minutes or more during inverter operation.
  • Page 129 [ X Troubleshooting ] 1. Error Code 4250 Instantaneous overcurrent (Detail code 106) Overcurrent (Detail code 107) 2. Error definition and error detection method P200 and P250 models Overcurrent 94 Apeak or 22 Arms and above is detected by the current sensor. P300 models and above Overcurrent 94 Apeak or 35 Arms and above is detected by the current sensor.
  • Page 130 [ X Troubleshooting ] 1. Error Code 4250 4255 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. 3.
  • Page 131 [ X Troubleshooting ] 1. Error Code 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) Pipe temperature sensor (TH2) fault (OA processing unit) 5103 Gas-side pipe temperature sensor (TH23) fault (Indoor unit) Gas-side pipe temperature sensor (TH3) fault (OA processing unit)
  • Page 132 [ X Troubleshooting ] 1. Error Code 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 Accumulator inlet temperature sensor (TH5) fault (Outdoor unit) 5106 HIC circuit outlet temperature sensor (TH6) fault (Outdoor unit) 5107...
  • Page 133 [ X Troubleshooting ] 1. Error Code 5110 Heat sink 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 134 [ X Troubleshooting ] 1. Error Code 5301 ACCT sensor fault (Detail code 115) 2. Error definition and error detection method When the formula "output current < 1.5 Arms" remains satisfied for 10 seconds while the inverter is in operation. 3.
  • Page 135 [ X Troubleshooting ] 1. Error Code 5301 Open-circuited IPM/Loose ACCT connector (Detail code 119) 2. Error definition and error detection method Presence of enough current cannot be detected during the self-diagnostic operation immediately before inverter startup. 3. Cause, check method and remedy Cause Check method and remedy Inverter output wiring problem...
  • Page 136 [ X Troubleshooting ] 1. Error Code 5701 Loose float switch connector 2. Error definition and error detection method Detection of the disconnected float switch (open-phase condition) during operation 3. Cause, check method and remedy (1) CN4F disconnection or contact failure Check for disconnection of the connector (CN4F) on the indoor unit control board.
  • Page 137 [ X Troubleshooting ] 1. Error Code 6600 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 The address and attribute that appear on the remote controller indicate the controller that detected the error. 3.
  • Page 138 [ X Troubleshooting ] 1. Error Code 6602 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. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 139 [ X Troubleshooting ] 1. Error Code 6603 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 The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 140 [ X Troubleshooting ] 1. Error Code 6607 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 141 [ X Troubleshooting ] 1. Error Code 6607 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 142 [ X Troubleshooting ] 1. Error Code 6607 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 143 [ X Troubleshooting ] 1. Error Code 6607 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 144 [ X Troubleshooting ] 1. Error Code 6607 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 145 [ X Troubleshooting ] 1. Error Code 6607 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 146 [ X Troubleshooting ] 1. Error Code 6607 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 147 [ X Troubleshooting ] 1. Error Code 6607 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 148 [ X Troubleshooting ] 1. Error Code 6608 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. The address/attribute appeared on the display on the remote controller indicates the controller where an error oc- curred.
  • Page 149 [ X Troubleshooting ] 1. Error Code 6831 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. 3.
  • Page 150 [ X Troubleshooting ] 1. Error Code 6832 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 3.
  • Page 151 [ X Troubleshooting ] 1. Error Code 6833 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. 3.
  • Page 152 [ X Troubleshooting ] 1. Error Code 6834 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. 3.
  • Page 153 [ X Troubleshooting ] 1. Error Code 7100 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. Error source, cause, check method and remedy, Error source Cause Check method and remedy...
  • Page 154 [ X Troubleshooting ] 1. Error Code 7101 Capacity code setting error 2. Error definition and error detection method Connection of incompatible (wrong capacity code) indoor unit or outdoor unit 3. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit...
  • Page 155 [ X Troubleshooting ] 1. Error Code 7102 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. Error source, cause, check method and remedy Error source Cause Check method and remedy...
  • Page 156 [ X Troubleshooting ] 1. Error Code 7105 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 Outdoor unit Erroneous setting of OC unit address Check that the address of OC unit is set to 51- The address of outdoor unit is not being set to 51 - 100.
  • Page 157 [ X Troubleshooting ] 1. Error Code 7110 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 158 [ X Troubleshooting ] 1. Error Code 7113 Function setting error 2. Error source, cause, check method and remedy Error source Cause Check method and remedy Outdoor unit Wiring failure Control board connector Check the CNTYP2,4,5 connector connection. INV board connector Check the CNTYP connector connection(P300 - P450 models only) Disconnected connector, short cir-...
  • Page 159 [ X Troubleshooting ] -1- Troubleshooting according to the remote controller malfunction or the external input error In the case of MA remote controller 1. Phenomena Even if the operation button on the remote controller is pressed, the display remains unlit and the unit does not start run- ning.(Power indicator does not appear on the screen.) 2.
  • Page 160 [ X Troubleshooting ] In the case of MA remote controller 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 161 [ X Troubleshooting ] In the case of MA remote controller 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. ("HO" or "PLEASE WAIT" display will normally turn off 5 minutes later after the power on.) 2.
  • Page 162 [ X Troubleshooting ] Flow chart Even if the operation button on the remote controller is pressed, the indoor and the outdoor units do not start running. - 153 - HWE07150...
  • Page 163 [ X Troubleshooting ] In the case of remote controller 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. Check pressure difference between the detected pressure by the pressure sensor and the actual Faulty detection of pressure sensor.
  • Page 164 [ X Troubleshooting ] Cause Check method and remedy Long piping length Check the piping length to determine if it is contrib- The cooling capacity varies greatly depending on the uting to performance loss. pressure loss. (When the pressure loss is large, the Piping pressure loss can be estimated from the cooling capacity drops.) temperature difference between the indoor unit...
  • Page 165 [ X Troubleshooting ] 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. Check pressure difference between the detected pressure by the pressure sensor and the actual Faulty detection of pressure sensor.
  • Page 166 [ X Troubleshooting ] Cause Check method and remedy Indoor unit LEV malfunction Refer to the page of LEV troubleshooting ( [4] -5- Insufficient refrigerant flows due to LEV malfunction ).(page 166) (not enough opening). Temperature reading error on the indoor unit piping Check the thermistor.
  • Page 167 [ X Troubleshooting ] 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 SW1.

  • Page 168: Investigation Of Transmission Wave Shape/Noise

    [ X Troubleshooting ] [3] Investigation of Transmission Wave Shape/Noise 1. M-NET transmission Control is performed by exchanging signals between the outdoor unit and the indoor unit (M-NET remote controller) through M-NET transmission. Noise interference on the transmission line will interrupt the normal transmission, leading to erroneous operation.
  • Page 169 [ X Troubleshooting ] (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. The transmission line and Isolate the transmission line from the power line (5cm [1-31/32"] or work is performed ac- the power line are not...
  • Page 170 [ X Troubleshooting ] 2. MA remote controller transmission 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 171: Troubleshooting Principal Parts

    [ X Troubleshooting ] [4] Troubleshooting Principal Parts -1- High-Pressure Sensor (63HS1) 1. Compare the pressure that is detected by the high pressure sensor, and the high-pressure gauge pressure to check for failure. By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the high- pressure sensor appears on the LED1 on the control board.
  • Page 172 [ X Troubleshooting ] -2- Low-Pressure Sensor (63LS) 1. Compare the pressure that is detected by the low pressure sensor, and the low pressure gauge pressure to check for failure. By configuring the digital display setting switch (SW1) as shown in the figure below, the pressure as measured by the low- pressure sensor appears on the LED1 on the control board.
  • Page 173 [ X Troubleshooting ] -3- Solenoid Valve Check whether the output signal from the control board and the operation of the solenoid valve match. Setting the self-diagnosis switch (SW1) 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 174 [ X Troubleshooting ] (3) In case of 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 175 [ X Troubleshooting ] -5- LEV LEV operation LEV (Indoor unit: Linear expansion valve), LEV2a, and LEV2b (Outdoor unit: Linear expansion valve) are stepping-motor-driv- en valves that operate by receiving the pulse signals from the indoor and outdoor unit control boards. (1) Indoor LEV and Outdoor LEV (LEV2a, LEV2b) The valve opening changes according to the number of pulses.
  • Page 176 [ X Troubleshooting ] (2) Outdoor LEV (LEV1) 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 Yellow White 2) Pulse signal output and valve operation...
  • Page 177 [ X Troubleshooting ] (3) Judgment methods and possible failure mode The specifications of the outdoor unit (outdoor LEV) and the indoor unit (indoor LEV) differ.Therefore, remedies for each failure may vary. Check the remedy specified for the appropriate LEV as indicated in the right column. Malfunction Judgment method Remedy...
  • Page 178 [ X Troubleshooting ] (4) Outdoor unit LEV (LEV1) coil removal procedure 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 Lead wire 2) Removing the coils...
  • Page 179 [ X Troubleshooting ] (5) Outdoor unit LEV (LEV2a,2b) coil removal procedure Motor Driver Locknut Bellows Valve assembling Refrigerant Circuit Valve body side Orifice Notes on the procedure 1) Do not put undue pressure on the motor. 2) Do not use motors if dropped. 3) Do not remove the cap until immediately before the procedure.
  • Page 180 [ X Troubleshooting ] Replacement procedure 1) Stop the air conditioner. After checking that the air conditioner is stopped, turn off the power of the outdoor unit. 2) Prepare two spanners. Hold the valve body with one spanner and loosen the locknut with another one. Turning the locknut counter-clockwise from motor side view can loosen it.
  • Page 181 [ X Troubleshooting ] -6- Inverter Replace only the compressor if only the compressor is found to be defective. Replace only the fan motor if only the fan motor is found to be defective. Replace the defective components if the inverter is found to be defective. If both the compressor and the inverter are found to be defective, replace the defective component(s) of both devices.
  • Page 182 [ X Troubleshooting ] Error display/failure condition Measure/inspection item Inverter related errors Check the details of the inverter error in the error log at 10.[1] Table of 4250, 4255, 4220, 4225, 4230, 4240,4260, 5301, 0403 LED codes. Take appropriate measures to the error code and the error details in ac- cordance with 9.
  • Page 183 [ X Troubleshooting ] (2) Inverter output related troubles Items to be checked Phenomena Remedy Disconnect the invert- Overcurrent error Replace the INV board. Check the er output wire from (4250 Detail code No. 101, 104, INV board er- the terminals of the 105, 106, and 107) ror detection INV board (SC-U,...
  • Page 184 [ X Troubleshooting ] Items to be checked Phenomena Remedy Disconnect the inverter Inverter-related problems are de- Connect the short-circuit con- Check whether output wire from the ter- tected. nector to CN6, and go to sec- the inverter is minals of the INV board tion [1].
  • Page 185 [ X Troubleshooting ] (3) Trouble treatment when the main power breaker is tripped Items to be checked Phenomena Remedy Check the breaker capacity. Use of a non-specified break- Replace it with a specified breaker. Perform Meg check between the Zero to several ohm, or Meg Check each part and wiring.
  • Page 186 [ X Troubleshooting ] (5) Simple checking procedure for individual components of main inverter circuit 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 voltage between FT-P and FT-N on INV Board has dropped to DC20V or less. Part name Judgment method IGBT module...
  • Page 187 [ X Troubleshooting ] Judgment value (reference) Black ( + ) SC-P1 FT-N SC-L1 SC-L2 SC-L3 SC-P1 5 - 200 ohm 5 - 200 ohm 5 - 200 ohm FT-N Red (-) SC-L1 5 - 200 ohm SC-L2 5 - 200 ohm SC-L3 5 - 200 ohm Black ( + )
  • Page 188 [ X Troubleshooting ] -7- Control Circuit (1) Control power source function block Power source system (AC 380 V) Control system (DC 5 ~ 30 V) INV board Noise filter Compressor Noise filter Rectifier Smoothing capacitor Inverter AC 380 V Fuse Terminal block for Inverter drive...
  • Page 189 [ X Troubleshooting ] (2) Troubleshooting transmission power circuit of outdoor unit Check the voltage at the indoor/outdoor transmission terminal block (TB3) of outdoor unit. DC 24 ~ 30 V Check whether the transmission line is disconnected, check for contact failure, and repair the problem. Check the voltage at TB3 after removing transmission line from TB3.

  • Page 190: Refrigerant Leak

    [ X Troubleshooting ] [5] Refrigerant Leak 1. Leak spot: In the case of extension pipe for indoor unit (Cooling season) 1) Mount a pressure gauge on the service check joint (CJ2) on the low-pressure side. 2) Stop all the indoor units, and close the liquid service valve (BV2) inside the outdoor unit while the compressor is being stopped. 3) Stop all the indoor units;...
  • Page 191 [ X Troubleshooting ] 3. Leak spot: In the case of extension pipe for indoor unit (Heating season) (1) Run all the indoor units in heating test run mode. 1) To run the indoor unit in test run mode, turn SW3-2 from ON to OFF when SW3-1 on the outdoor control board is ON. 2) Change the setting of the remote controller for all the indoor units to the heating mode.

  • Page 192: Compressor Replacement Instructions

    [ X Troubleshooting ] [6] Compressor Replacement Instructions [Compressor replacement procedures] Follow the procedures below (Steps 1 through 6) to remove the compressor components and replace the compressor. Reassemble them in the reverse order after replacing the compressor. 1. Remove both the top and bottom service panels 2.
  • Page 193 [ X Troubleshooting ] Compressor covers (right and left) (The inside of the compressor cover is lined with sound insulation material.) Compressor cover (top) Belt heater 4. Remove the compressor cover (top). 5. Remove the compressor wires, compressor covers (right and left), and belt heater. Protection for the sealing material Suction piping...

  • Page 194: Troubleshooting Using The Outdoor Unit Led Error Display

    [ X Troubleshooting ] [7] Troubleshooting Using the Outdoor Unit LED Error Display If the LED error display appear as follows while all the SW1 switches are set to OFF, check the items under the applicable item numbers below. 1. Error code appears on the LED display. Refer to 9.
  • Page 195 [ X Troubleshooting ] - 186 - HWE07150...
  • Page 196 XI LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor ............... 189 - 187 - HWE07150...
  • Page 197 - 188 -...
  • Page 198 [ XI LED Monitor Display on the Outdoor Unit Board ] XI LED Monitor Display on the Outdoor Unit Board [1] How to Read the LED on the Service Monitor 1. How to read the LED By setting the DIP SW 1-1 through 1-10 (Switch number 10 is represented by 0), the operating condition of the unit can be monitored on the service monitor.
  • Page 199 [ XI LED Monitor Display on the Outdoor Unit Board ] 3. Time data storage 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 G(B)-50A. If an error (including a preliminary error) occurs, the error history data and the error detection time are stored into the service memory.
  • Page 200 [ XI LED monitor display on the outdoor unit board ] - 191 - HWE07150...
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