Mitsubishi Electric PUHZ-SHW230YKA2 Service Manual
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Mitsubishi Electric PUHZ-SHW230YKA2 Service Manual

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SPLIT-TYPE, AIR CONDITIONER
SERVICE MANUAL
R410A
[Model Name]
PUHZ-SHW230YKA2
[Service Ref.]
PUHZ-SHW230YKA2
PUHZ-SHW230YKA2R1
PUHZ-SHW230YKA2R2
Revision:
• Added
• Some descriptions have
OCH594 REVISED EDITION-A
is void.
Note:
• This manual describes
CONTENTS
Technical Changes ...................................... 2
1. SAFETY PRECAUTION ................................... 3
2. SPECIFICATIONS ............................................ 5
3. DATA ............................................................... 7
4. OUTLINES AND DIMENSIONS ....................... 9
5. WIRING DIAGRAM ........................................ 10
6. WIRING SPECIFICATIONS ........................... 12
8. TROUBLESHOOTING ................................... 15
9. DISASSEMBLY PROCEDURE ...................... 57
PARTS CATALOG (OCB594)
December 2018
No. OCH594
REVISED EDITION-B
PUHZ-SHW230YKA2R2
in REVISED EDITION-B.
been modified.
service data of the outdoor
unit only.

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Summary of Contents for Mitsubishi Electric PUHZ-SHW230YKA2

  • Page 1: Service Manual

    REVISED EDITION-B SERVICE MANUAL R410A Revision: • Added [Model Name] [Service Ref.] PUHZ-SHW230YKA2R2 in REVISED EDITION-B. • Some descriptions have PUHZ-SHW230YKA2 PUHZ-SHW230YKA2 been modified. OCH594 REVISED EDITION-A PUHZ-SHW230YKA2R1 is void. PUHZ-SHW230YKA2R2 Note: • This manual describes service data of the outdoor unit only.

  • Page 2: Technical Changes

    TECHNICAL CHANGES Service ref. have been changed as follows. PUHZ-SHW230YKA2 PUHZ-SHW230YKA2R1 • A compliance with ErP directive Lot6 has been authorized. PUHZ-SHW230YKA2R1 PUHZ-SHW230YKA2R2 • Power board, controller board and noise filter board have been changed. • Quantity of refrigerant has been changed.

  • Page 3: Safety Precaution

    SAFETY PRECAUTION 1-1. ALWAYS OBSERVE FOR SAFETY Before obtaining access to terminal, all supply circuits must be disconnected. Preparation before the repair service. • Prepare the proper tools. • Prepare the proper protectors. • Provide adequate ventilation. • After stopping the operation of the air conditioner, turn off the power-supply breaker. •...

  • Page 4: Specifications

    [2] Additional refrigerant charge When charging directly from cylinder · Check that cylinder for R410A on the market is a syphon type. · Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.) Unit Electronic weighing scale [3] Service tools...

  • Page 5: Data>

    SPECIFICATIONS 2-1. SPECIFICATION 2-1-1. PUHZ-SHW230YKA2 <Reference data> Plate heat exchanger (MWA2-38PA) *2 pcs [connected in parallel] Rating conditions Nominal operating condition Nominal water flow L/min 65.9 Heating (A2/W35) Heating Capacity 23.0 (A7/W35) Outside air temperature (Dry-bulb) + 2°C 3.65 Outside air temperature (Wet-bulb) + 1°C...

  • Page 6: Heating

    2-1-2. Outdoor unit Service Ref. PUHZ-SHW230YKA2 PUHZ-SHW230YKA2R2 PUHZ-SHW230YKA2R1 Running current Heating(A7/W35) Cooling(A35/W7) Power factor Heating(A7/W35) Cooling(A35/W7) Power supply (phase, voltage, cycle) 3 phase, 400 V, 50 Hz Max. current 26.0 Breaker size Outer casing Galvanized plate External finish Munsell 3Y 7.8/1.1...
  • Page 7 Amount of additional refrigerant charge (kg) method (kg) size 2 - 10 m 11 - 20 m 21 - 30 m 31 - 40 m 41–50 m 51–60 m 61–70 m 71–80 m PUHZ-SHW230YKA2 ATW/ATA/ PUHZ-SHW230YKA2R1 ø12.7 ø9.52 PUHZ-SHW230YKA2R2 *1 ø12.7...
  • Page 8 (MWA2-38PA) o 2 pcs [connected in parallel] Mode Cooling Heating (A35/W7) (A7/W35) Capacity 20,000 23,000 Input 9.01 6.31 Outdoor unit PUHZ-SHW230YKA2 Phase, Hz 3, 50 Voltage Current 13.7 Discharge pressure Suction pressure Discharge temperature ºC Condensing temperature ºC Suction temperature ºC...

  • Page 9: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm PUHZ-SHW230YKA2 PUHZ-SHW230YKA2R1 PUHZ-SHW230YKA2R2 OCH594B...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM PUHZ-SHW230YKA2 PUHZ-SHW230YKA2R1 SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply> LEV-A, LEV-B, LEV-C Linear Expansion Valve Switch<Model Select> Terminal Block<Indoor/Outdoor> ACL4 Reactor Switch<Function Switch> Motor for Compressor Reactor Switch<Function Switch> MF1,MF2 Fan Motor CB1, CB2 Main Smoothing Capacitor Switch<Function Switch>...
  • Page 11 PUHZ-SHW230YKA2R2 OCH594B...

  • Page 12: Wiring Specifications

    WIRING SPECIFICATIONS A Indoor unit B Outdoor unit L1 L2 L3 C Remote controller D Main switch (Breaker) E Earth For Power For Power Twin or triple system construction of the hydrobox is not allowed. When the hydrobox is constructed as a slave, remote controller must be connected by crossover wiring.
  • Page 13 INDOOR-OUTDOOR CONNECTING CABLE Cross section of cable Wire size (mm Number of wires Polarity L (m)* Round Clockwise : S1-S2-S3 (30)* (Pay attention to stripe of yellow and green.) Flat Not applicable Not applicable* (Since center wire has no cover finish.) Flat From left to right: S1-Open-S2-S3 (18)*...

  • Page 14: Refrigerant System Diagram

    Refrigerant flow in cooling Refrigerant flow in heating LEV-C Symbol Part name Detail COMP Compressor DC inverter scroll compressor (Mitsubishi Electric Corporation) INJ. port Compressor Injection port Muffler Discharge muffler Heat exchanger H/P SW High pressure switch (63H) For protection (OFF: 4.15MPa)

  • Page 15: Troubleshooting

    TROUBLESHOOTING 8-1. TROUBLESHOOTING <Check code displayed by self-diagnosis and actions to be taken for service (summary)> Present and past check codes are logged, and they can be displayed on the control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summarized in the table below. Check the contents below before investigating details.
  • Page 16 8-2. CHECKPOINT UNDER TEST RUN Before test run • After installation of outdoor unit, piping work and electric wiring work, re-check that there is no water leakage, loosened con- nections and incorrect polarity. • Measure impedance between the ground and the power supply terminal block (L, N) on the outdoor unit by 500 V Megger and check that it is 1.0 M or over.
  • Page 17 8-3. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> Check Code Abnormal point and detection method Case Judgment and action 1 No voltage is supplied to termi- 1 Check following items. nal block (TB1) of outdoor unit. a) Power supply breaker is a) Power supply breaker turned off.
  • Page 18 Check Code Abnormal point and detection method Case Judgment and action Check disconnection or looseness or polarity Miswiring of Interface unit/Flow temp. Contact failure or miswiring of of Interface unit/Flow temp. controller-outdoor controller-outdoor unit connecting wire Interface unit/Flow temp. controller- unit connecting wire of Interface unit/Flow 1.
  • Page 19 <Abnormalities detected while unit is operating> Abnormal point and detection method Judgment and action Check Code Case High pressure (High pressure switch 1 Short cycle of indoor unit 1–6 Check indoor unit and repair defectives. 63H operated) 2 Clogged filter of indoor unit Abnormal if high pressure switch 63H oper- 3 Decreased airflow caused by ated(*) during compressor operation.
  • Page 20 Check Code Abnormal point and detection method Judgment and action Case Open/short of outdoor unit thermistors 1 Disconnection or contact failure 1 Check connection of connector (TH3, TH32, (TH3, TH32, TH6, TH7 and TH8) of connectors TH7/6) on the outdoor controller circuit board. Check connection of connector (CN3) on the Abnormal if open or short is detected Outdoor controller circuit board:...
  • Page 21 Abnormal point and detection method Judgment and action Case Check Code To find out the details about U9 error, turn ON SW2-1, 2-2, 2-3, 2-4, 2-5 and 2-6 when U9 error occurs. To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2, 2-6. Detailed Refer to "8-8.
  • Page 22 Check Code Abnormal point and detection method Judgment and action Case 1 Defective outdoor fan (fan Overheat protection 1 Check outdoor unit air passage. motor) or short cycle of outdoor Abnormal if outdoor pipe thermistor (TH3), unit during cooling operation condensing temperature T detects 70: 63HS...
  • Page 23 Check Code Abnormal point and detection method Cause Judgment and action 1 Open stop valve. Compressor overcurrent interruption 1 Stop valve of outdoor unit is closed. 2 Check facility of power supply. Abnormal if overcurrent DC bus or com- 2 Decrease of power supply voltage 3 Correct the wiring (U·V·W phase) to compres- pressor is detected after compressor starts 3 Looseness, disconnection or...
  • Page 24 Check Code Abnormal point and detection method Case Judgment and action Interface unit/Flow temp. controller 1 Contact failure, short circuit Note: Check LED display on the outdoor or outdoor unit communication error or, miswiring (reverse wiring) controller circuit board. (Connect (Signal receiving error) of Interface unit/Flow temp.
  • Page 25 Check Code Abnormal point and detection method Cause Judgment and action Actual flow water temperature thermis- 1 Defective thermistor 1–2 Check resistance value of thermistor. 0: 15.0 k" tor (TH1) characteristics 9.6 k" 1 The unit is in 3-minute resume 2 Breaking of wire or contact 6.3 k"...
  • Page 26 8-4. TROUBLESHOOTING ■ These sounds can be heard when refrigerant and/or water is (are) flowing A flowing water sound or occasional hissing sound is heard. in the indoor unit or refrigerant pipe, or when the refrigerant and/or water is (are) chugging. ■...
  • Page 27 8-5. HOW TO CHECK THE PARTS PUHZ-SHW230YKA2 PUHZ-SHW230YKA2R1 PUHZ-SHW230YKA2R2 Checkpoints Parts name Thermistor (TH3) Disconnect the connector then measure the resistance with a tester. <Liquid> (At the ambient temperature 10 to 30:) Thermistor (TH4) Normal Abnormal <Discharge> 160 to 410k"...
  • Page 28 Check method of DC fan motor (fan motor/outdoor controller circuit board) Notes · High voltage is applied to the connector (CNF1, 2) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1, 2) for the motor with the power supply on. board and fan motor.) (It causes trouble of the outdoor controller circuit Self check...
  • Page 29 8-6. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid> (TH3) • Thermistor <2-Phase Pipe> (TH6) • Thermistor <Ambient> (TH7) • Thermistor <Suction> (TH32) Thermistor R0 = 15 kΩ ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t –...
  • Page 30 Linear expansion valve (1) Operation summary of the linear expansion valve • Linear expansion valve opens/closes through stepping motor after receiving the pulse signal from the outdoor controller board. • Valve position can be changed in proportion to the number of pulse signal. <Connection between the outdoor controller board and the linear expansion valve>...
  • Page 31 (3) How to attach and detach the coil of linear expansion valve <Composition> Linear expansion valve is separable into the main body and the coil as shown in the diagram below. Main body Stopper Coil Lead wire <How to detach the coil> Hold the lower part of the main body (shown as A) firmly so that the main body does not move and detach the coil by pulling it upward.
  • Page 32 8-7. TEST POINT DIAGRAM Outdoor controller circuit board PUHZ-SHW230YKA2 PUHZ-SHW230YKA2R1 CN51 Manual defrost, detect history record reset, External signal output Demand control setting Function switch refrigerant address • Compressor operating signal • Abnormal signal CNDM Model select 1–2: Input of low-level...
  • Page 33 Outdoor controller circuit board PUHZ-SHW230YKA2R2 21S4 Manual defrost, detect history record reset, Demand control setting Function switch 4-way valve CN51 refrigerant address External signal output • Compressor operating signal • Abnormal signal Model select CNDM 1–2: Input of low-level Test operation sound priority mode 1–3: Input of external...
  • Page 34 Outdoor noise filter circuit board PUHZ-SHW230YKA2 PUHZ-SHW230YKA2R1 CNAC1 LI1, LI2, LI3, NI 230 V AC POWER SUPPLY (Connect to the LI1-LI2/LI-LI3/LI3-LI1 : 400 V AC input outdoor controller LI1-NI/LI2-NI/LI3-NI : 230 V AC input circuit board (Connect to the terminal block (TB1))
  • Page 35 Outdoor noise filter circuit board PUHZ-SHW230YKA2R2 CNAC1 LI1, LI2, LI3, NI 230 V AC POWER SUPPLY (Connect to the LI1-LI2/LI2-LI3/LI3-LI1: 400 V AC input outdoor controller LI1-NI/LI2-NI/LI3-NI: 230 V AC input circuit board (Connect to the terminal block (TB1)) (CNAC)) Connect to the earth CNAC2 230 V AC...
  • Page 36 Outdoor power circuit board Brief Check of POWER MODULE If they are short-circuited, it means that they are broken. PUHZ-SHW230YKA2 Measure the resistance in the following points (connectors, etc.). PUHZ-SHW230YKA2R1 1. Check of POWER MODULE 1 Check of DIODE circuit...
  • Page 37 Outdoor power circuit board Brief Check of POWER MODULE Usually, they are in a state of being short-circuited if they are broken. PUHZ-SHW230YKA2R2 Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken. 1.
  • Page 38 8-8. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS Function of switches The black square ( ) indicates a switch position. Type Action by the switch operation Function Effective timing Switch switch When compressor is working Manual defrost* Start Normal in heating operation.* Abnormal history clear Clear Normal...
  • Page 39 ≤ 3°C (Initial setting) Starting Ambient temp. Always ≤ 0°C of flash injection ≤ –3°C ≤ –6°C MODELS SW5-6 PUHZ-SHW230YKA2 PUHZ-SHW230YKA2R1 1 2 3 4 5 6 1 2 3 Model select MODELS SW5-6 PUHZ-SHW230YKA2R2 1 2 3 1 2 3 4 5 6 “Power failure automatic recovery”...
  • Page 40 (2) Function of connector Action by open/ short operation Types Connector Function Effective timing Short Open Connector CN31 Start When power supply ON Emergency operation Normal Special function (a) Low-level sound priority mode (Local wiring) By performing the following modification, operation noise of the outdoor unit can be reduced by about 3-4 dB. The low noise mode will be activated when a commercially available timer or the contact input of an ON/OFF switch is added to the CNDM connector (option) on the control board of the outdoor unit.
  • Page 41 <Display function of inspection for outdoor unit> The blinking patterns of both LED1 (green) and LED2 (red) indicate the types of abnormality when it occurs. Types of abnor- mality can be indicated in details by connecting an optional part “A-Control Service Tool (PAC-SK52ST)” to connector CNM on outdoor controller board.
  • Page 42 Indication Error Outdoor controller board Check Contents Inspection method code LED1 (Green) LED2 (Red) 3 blinking 1 blinking Abnormality of comp. surface 1Check if stop valves are open. 2Check if connectors (TH4, TH34, LEV-A, and LEV-B) on outdoor temperature (TH34) and discharging controller board are not disconnected.
  • Page 43 <Outdoor unit operation monitor function> [When optional part “A-Control Service Tool (PAC-SK52ST)” is connected to outdoor controller board (CNM)] Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of check code by controlling DIP SW2 on “A-Control Service Tool”. Operation indicator SW2 : Indicator change of self-diagnosis SW2 setting...
  • Page 44 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid(TH3) −40 to 90 −40 to 90 (When the coil thermistor detects 0: or below, “−” and temperature are displayed by turns.) (Example) When −10:;...
  • Page 45 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH3) on error −40 to 90 occurring (When the coil thermistor detects 0: or below, “−” −40 to 90 and temperature are displayed by turns.) (Example) When −15:;...
  • Page 46 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 to 3 The number of connected indoor units (The number of connected indoor units is displayed.) Unit 2 3 4 5 6 Capacity setting display Displayed as an outdoor capacity code.
  • Page 47 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Ambient temperature (TH7) −39 to 88 −39 to 88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.) 2 3 4 5 6 Outdoor heat sink temperature (TH8) −40 to 200...
  • Page 48 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 to 255 Capacity save (When the capacity is 100% hundreds digit, tens digit 0 to 255 and ones digit are displayed by turns.) (Example) When 100%;...
  • Page 49 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature/Liquid (TH2) on error −39 to 88 occurring (When the temperature is 0°C or less, “–” and −39 to 88 temperature are displayed by turns.) (Example) When −15°C;...
  • Page 50 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail Pipe temperature/Liquid −39 to 88 (TH2 (3)) (When the temperature is 0°C or less, “–” and Indoor 3 temperature are displayed by turns.) −39 to 88 2 3 4 5 6 The following code will be a help to know the...
  • Page 51 8-9. Request code list Certain indoor/outdoor combinations do not have the request code function; therefore, no request codes are displayed. Refer to indoor unit service manual for how to use the controllers and request codes for indoor unit. Description Request content Unit Remarks (Display range)
  • Page 52 Description Request content Unit Remarks (Display range) – Outdoor unit-Control state – Refer to 8-9-1.Detail Contents in Request Code. Compressor-Frequency control state Refer to 8-9-1.Detail Contents in Request Code. – Outdoor unit-Fan control state Refer to 8-9-1.Detail Contents in Request Code. –...
  • Page 53 Description Request content Unit Remarks (Display range) Error history 1 (latest) Displays error history. (" --" is displayed if no history is present.) Code Error history 2 (second to last) Displays error history. (" --" is displayed if no history is present.) Code Error history 3 (third to last) Displays error history.
  • Page 54 8-9-1. Detail Contents in Request Code [Operation state] (Request code :" 0") Relay output state Power currently Data display Display Compressor 4-way valve Solenoid valve supplied to compressor – – – – Relay output state Operation mode Operation mode Display Operation mode STOP •...
  • Page 55 [Actuator output state] (Request code :"54") Data display Actuator output state 1 Actuator output state 2 Actuator output state Actuator output state Compressor is Display 4-valve Compressor Display warming up [Error content (U9)] (Request code :"55 ") Data display Error content 1 Error content 2 Error content : Detected...
  • Page 56 [Outdoor unit – Capacity setting display] (Request code : "70") Data display Capacity [Outdoor unit – Setting information] (Request code : "71") Setting information 1 Data display Display Defrost mode Setting information 1 Standard Setting information 2 For high humidity Setting information 2 Single-/ Heat pump/...

  • Page 57: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUHZ-SHW230YKA2 PUHZ-SHW230YKA2R1 PUHZ-SHW230YKA2R2 : Indicates the visible parts in the photos/figures. OPERATING PROCEDURE PHOTOS/FIGURES Photo 1 1. Removing the service panel and top panel Top panel fixing screws Top panel (1) Remove 3 service panel fixing screws (5 × 12) and slide...
  • Page 58 OPERATING PROCEDURE PHOTOS/FIGURES Photo 3 3. Removing the electrical parts box (1) Remove the service panel. (See Photo 1) < YKA2/YKA2R1 type > Electrical parts box (2) Remove the top panel. (See Photo 1) Electrical parts box fixing screws Controller circuit (3) Disconnect the indoor/outdoor connecting wires from board (C.B.) terminal block.
  • Page 59 OPERATING PROCEDURE PHOTOS/FIGURES Photo 5 5. Removing the thermistor <Ambient> (TH7) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Disconnect the connectors of TH6 and TH7 (red) on the controller circuit board in the electrical parts box. (4) Loosen the 2 wire clamps on top of the electrical parts box.
  • Page 60 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the 4-way valve coil (21S4) and linear Figure 3 expansion valve coil (LEV-A, LEV-B, LEV-C) < YKA2/YKA2R1 type > Linear expansion valves (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) Linear expansion Linear expansion...
  • Page 61 OPERATING PROCEDURE PHOTOS/FIGURES Photo 7 10. Removing the high pressure switch (63H) and low pres- sure switch (63L) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box. (See Photo 3) (4) Remove the valve bed.
  • Page 62 OPERATING PROCEDURE PHOTOS/FIGURES 12. Removing the power receiver Photo 9 Power receiver (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove 2 front cover panel fixing screws (5 × 12) and remove the front cover panel.
  • Page 63 OCH594B...
  • Page 64 HEAD OFFICE : TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2015 MITSUBISHI ELECTRIC CORPORATION Issued: Dec. 2018 No. OCH594 REVISED EDITION-B Issued: Oct. 2017 No. OCH594 REVISED EDITION-A Published: Jul. 2015 No. OCH594 Made in Japan Specifications are subject to change without notice.

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