Mitsubishi Electric Mr. Slim PUHZ-SHW230YKA Service Manual
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Mitsubishi Electric Mr. Slim PUHZ-SHW230YKA Service Manual

Split-type, air to water heat pump
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SPLIT-TYPE, AIR TO WATER HEAT PUMP
SERVICE MANUAL
R410A
[Model name]
PUHZ-SHW230YKA
PUHZ-SHW230YKA
[Service Ref.]
PUHZ-SHW230YKA
Note:
• This manual describes only
service data of the outdoor
unit.
• Refer to Technical manual of
ATW, I/F and FTC.
• RoHS compliant products
have <G> mark on the spec
name plate.
CONTENTS
1. SAFETY PRECAUTION ................................... 2
2. SPECIFICATIONS ............................................ 5
3. DATA ............................................................... 7
4. OUTLINES AND DIMENSIONS ....................... 9
5. WIRING DIAGRAM ........................................ 10
6. WIRING SPECIFICATIONS ............................ 11
8. TROUBLESHOOTING ................................... 14
9. DISASSEMBLY PROCEDURE ...................... 47
PARTS CATALOG (OCB534)
September 2012
No. OCH534

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Summary of Contents for Mitsubishi Electric Mr. Slim PUHZ-SHW230YKA

  • Page 1: Table Of Contents

    SPLIT-TYPE, AIR TO WATER HEAT PUMP September 2012 No. OCH534 SERVICE MANUAL R410A [Model name] [Service Ref.] Note: • This manual describes only PUHZ-SHW230YKA PUHZ-SHW230YKA service data of the outdoor unit. • Refer to Technical manual of ATW, I/F and FTC. •...

  • Page 2: 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 beaker. •...
  • Page 3 [1] Cautions for service (1) Perform service after recovering the refrigerant left in unit completely. (2) Do not release refrigerant in the air. (3) After completing service, charge the cycle with specified amount of refrigerant. [2] Additional refrigerant charge When charging directly from cylinder ·...
  • Page 4 1-3. CAUTIONS FOR REFRIGERANT PIPING WORK Tools for R410A (The following table shows whether conventional tools can be used or not.) Tools and materials R410A tools Can R22 tools be used? Can R407C tools be used? Gauge manifold Air purge, refrigerant charge Tool exclusive for R410A Charge hose and operation check...

  • Page 5: Specifications

    SPECIFICATIONS 2-1. SPECIFICATION 2.-1-1. PUHZ-SHW230YKA <Reference data> Plate heat exchanger (MWA2-38PA) *2pcs [connected in parallel] Rating conditions Nominal operating condition Nominal water fl ow 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 Power input...
  • Page 6 2-1-2. Outdoor unit Model name PUHZ-SHW230YKA Running current Heating(A7/W35) Cooling(A35/W7) 13.7 Power factor Heating(A7/W35) Cooling(A35/W7) Power supply (phase, cycle, voltage) 3 phase, 50 Hz, 400 V Max. current 25.0 Breaker size Outer casing Galvanized plate External fi nish Munsell 3Y 7.8/1.1 Refrigerant control Liner expansion valve Compressor...

  • Page 7: Data

    DATA 3-1. Addition of refrigerant Total piping length (one way) At time Amount of additional refrigerant charge (kg) shipping 30 m and less 31-40 m 41-50 m 51-60 m 61-70 m 71-80 m For single combination 1.4 kg 2.8 kg 4.2 kg 5.6 kg 7.0 kg...
  • Page 8 3-3. Standard operation data Reference data (connect to Plate HEX) (MWA2-38PA) o 2 pcs [connected in parallel] Cooling Heating Mode (A35/W7) (A7/W35) Capacity 20,000 23,000 Input 9.01 6.31 Outdoor unit PUHZ-SHW230YKA Phase, Hz 3, 50 Voltage Current 13.7 Discharge pressure Suction pressure Discharge temperature ºC...

  • Page 9: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm PUHZ-SHW230YKA OCH534...

  • Page 10: Wiring Diagram

    WIRING DIAGRAM PUHZ-SHW230YKA SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply> FUSE1, FUSE2 Fuse<T15AL250V> Switch<Model Select> Capacitor Terminal Block<Indoor/Outdoor> CY1, CY2 Switch<Function Switch> Motor for Compressor P. B. Power Circuit Board Switch<Function Switch> MF1,MF2 Fan Motor Connection Terminal<U/V/W-Phase> Switch<Function Switch> SC-U/V/W 21S4 Solenoid Valve (Four-Way Valve)

  • Page 11: 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 Note: When multiple indoor units (Hydro boxes) are connected to the outdoor unit, wire the PCB of either one of the indoor unit and the outdoor unit (S1,S2,S3).
  • Page 12 INDOOR-OUTDOOR CONNECTING CABLE (SHW230) Cross section of cable Wire size (mm Number of wires Polarity L (m)*6 Round Clockwise : S1-S2-S3 (30) *Pay attention to stripe of yellow and green Flat Not applicable Not applicable (Because center wire has no cover finish) Flat From left to right : S1-Open-S2-S3 (18)

  • Page 13: 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) H/P SW High pressure switch (63H) For protection (OFF: 4.15MPa) L/P SW Low pressure switch (63L) For protection (OFF: -0.03MPa) REV/V...

  • Page 14: Troubleshooting

    TROUBLESHOOTING 8-1. TROUBLESHOOTING <Error code display by self-diagnosis and actions to be taken for service (summary)> Present and past error codes are logged and displayed on the control board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring at service, are summarized in the table below. Check the contents below before investigating details.
  • Page 15 8-2. CHECK POINT 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 16 8-3. SELF-DIAGNOSIS ACTION TABLE <Abnormalities detected when the power is turned on> Abnormal point and detection method Judgment and action Error Code Case 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 17 Abnormal point and detection method Case Judgment and action Error Code 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 18 <Abnormalities detected while unit is operating> <Abnormalities detected while unit is operating> Abnormal point and detection method Judgment and action Error Code Case 1 Short cycle of indoor unit 1~6 Check indoor unit and repair defectives. High pressure (High-pressure switch 2 Clogged filter of indoor unit 63H operated) 3 Decreased airflow caused by...
  • Page 19 Abnormal point and detection method Case Judgment and action Error Code 1 Disconnection or contact failure 1 Check connection of connector (TH3, TH32, Open/short of outdoor unit thermistors (TH3, TH32, TH6, TH7, and TH8) of connectors TH7/6) on the outdoor controller circuit board. Abnormal if open or short is detected Outdoor controller circuit board: Check connection of connector (CN3) on the...
  • Page 20 Abnormal point and detection method Case Judgment and action Error 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. Detailed To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2, 2-6. codes Refer to 8-8.
  • Page 21 Abnormal point and detection method Judgment and action Error Code Case 1 Defective outdoor fan (fan 1 Check outdoor unit air passage. Overheat protection motor) or short cycle of outdoor Abnormal if outdoor pipe thermistor (TH3), unit during cooling operation condensing temperature T detects 70: 63HS...
  • Page 22 Error Code Abnormal point and detection method Cause Judgment and action 1 Open stop valve. 1 Stop valve of outdoor unit is closed. Compressor overcurrent interruption 2 Check facility of power supply. 2 Decrease of power supply voltage Abnormal if overcurrent DC bus or com- 3 Correct the wiring (U·V·W phase) to compres- 3 Looseness, disconnection or pressor is detected after compressor starts...
  • Page 23 Error Code Abnormal point and detection method Case Judgment and action 1 Contact failure, short circuit Interface unit/Flow temp. controller * Check LED display on the outdoor controller or outdoor unit communication error or, miswiring (converse wiring) circuit board. (Connect A-control service tool, (Signal receiving error) of Interface unit/Flow temp.
  • Page 24 Error Code Abnormal point and detection method Cause Judgment and action 1 Defective thermistor 1–3 Check resistance value of thermistor. Actual fl ow water temperature thermis- 15.0k" tor (TH1) characteristics 9.6k" 1 The unit is in 3-minute resume 2 Contact failure of TB61 No.1-2 6.3k"...
  • Page 25 8-4. TROUBLESHOOTING ■ These sounds can be heard when refrigerant and/or water is (are) fl owing A fl owing 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 26 8-5. HOW TO CHECK THE PARTS PUHZ-SHW230YKA Parts name Check points TH3: Liquid pipe Disconnect the connector then measure the resistance with a tester. temperature (At the ambient temperature 10 ~30 ) TH4: Discharge temperature Normal Abnormal TH6: 2-phase pipe 160k ~ 410k temperature...
  • Page 27 Check method of DC fan motor (fan motor / outdoor controller circuit board) Notes · High voltage is applied to the connecter (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. (It causes trouble of the outdoor controller circuit board and fan motor.) Self check...
  • Page 28 8-6. HOW TO CHECK THE COMPONENTS <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid pipe> (TH3) • Thermistor <2-phase pipe> (TH6) • Thermistor <Ambient> (TH7) • Thermistor <Suction pipe> (TH32) Thermistor R0 = 15k' ± 3% B constant = 3480 ± 2% =15exp{3480( 273+t –...
  • Page 29 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 30 (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 31 8-7. TEST POINT DIAGRAM Outdoor controller circuit board PUHZ-SHW230YKA CN51 Forced defrost, detect history record reset, External signal output Demand control setting Function switch refrigerant address • Compressor operating signal • Abnormal signal CNDM Model select 1 to 2: Input of low-level sound priority mode Test operation 1 to 3:...
  • Page 32 Outdoor noise filter circuit board PUHZ-SHW230YKA LI1, LI2, LI3, NI POWER SUPPLY LI1-LI2/LI-LI3/LI3-LI1 : AC400V input LI1-NI/LI2-NI/LI3-NI : AC230V input (Connect to the terminal block (TB1)) Connect to the earth CNAC1, CNAC2 Connect to the earth AC230V (Connect to the outdoor controller circuit board (CNAC))
  • Page 33 Outdoor power circuit board Brief Check of POWER MODULE W Usually, they are in a state of being short-circuited if they are broken. PUHZ-SHW230YKA Measure the resistance in the following points (connectors, etc.). If they are short-circuited, it means that they are broken. 1.
  • Page 34 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 Forced defrost 1 Start Normal in heating operation. 1 Abnormal history clear Clear Normal...
  • Page 35 The black square ( ) indicates a switch position. Action by the switch operation Type of Switch Function Effective timing Switch No function — — — Power failure Auto recovery No auto recovery When power supply ON automatic recovery 2 No function —...
  • Page 36 Special function (a) Low-level sound priority mode (Local wiring) Unit enters into Low-level sound priority mode by external signal input setting. Inputting external signals to the outdoor unit decreases the outdoor unit operation sound 3 to 4 dB lower than that of usual. Adding a commercial timer or on-off switch contactor setting to the CNDM connector which is optional contactor for demand input located on the outdoor controller board enables to control compressor operation frequency.
  • Page 37 <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 38 Indication Error Outdoor controller board Error Contents Inspection method code LED1 (Green) LED2 (Red) 3 blinking 1 blinking Check if stop valves are open. Abnormality of comp. surface Check if connectors (TH4, TH34, LEV-A, and LEV-B) on outdoor temperature (TH34) and discharging controller board are not disconnected.
  • Page 39 <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 error code by controlling DIP SW2 on “A-Control Service Tool”. Operation indicator SW2 : Indicator change of self diagnosis SW2 setting...
  • Page 40 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature / Liquid(TH3) -40 – 90 -40 – 90 (When the coil thermistor detects 0: or below, “–” and temperature are displayed by turns.) (Example) When −10:;...
  • Page 41 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature / Liquid (TH3) on error -40 – 90 occurring (When the coil thermistor detects 0: or below, “–” -40 – 90 and temperature are displayed by turns.) (Example) When −15:;...
  • Page 42 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 – 3 The number of connected indoor units (The number of connected indoor units are dis- played.) Unit 2 3 4 5 6 Capacity setting display Displayed as an outdoor capacity code.
  • Page 43 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Ambient temperature (TH7) -39 – 88 -39 – 88 (When the temperature is 0: or less, “–” and temperature are displayed by turns.) 2 3 4 5 6 Outdoor heatsink temperature (TH8) -40 –...
  • Page 44 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 0 – 255 Capacity save (When the capacity is 100% hundreds digit, tens digit 0 – 255 and ones digit are displayed by turns.) (Example) When 100%;...
  • Page 45 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Pipe temperature / Liquid (TH2) on error -39 – ~88 occurring (When the temperature is 0°C or less, “–” and -39 – 88 temperature are displayed by turns.) (Example) When −15°C;...
  • Page 46 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit −39 – 88 Pipe temperature / Liquid (TH2 (3)) (When the temperature is 0°C or less, “–” and Indoor 3 temperature are displayed by turns.) -39 –...

  • Page 47: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUHZ-SHW230YKA OPERATING PROCEDURE PHOTOS & ILLUSTRATION 1. Removing the service panel and top panel Photo 1 Top panel Top panel fixing screws (1) Remove 3 service panel fixing screws (5 × 12) and slide the hook on the right downward to remove the service Service panel panel.
  • Page 48 PHOTOS OPERATING PROCEDURE 4. Removing the thermistor <Outdoor 2-phase pipe> (TH6) Photo 5 Thermistor (1) Remove the service panel. (See Photo 1) <Outdoor 2-phase pipe> (TH6) (2) Remove the top panel. (See Photo 1) (3) Disconnect the connectors, TH6 and TH7 (red), on the Electrical controller circuit board in the electrical parts box.
  • Page 49 OPERATING PROCEDURE PHOTOS 7. Removing the 4-way valve coil (21S4) and linear expan- Figure 1 sion valve coil (LEV-A, LEV-B, LEV-C) (1) Remove the service panel. (See Photo 1) Linear expansion valve coil (LEV-C) Linear expansion valve (2) Remove the top panel. (See Photo 1) (3) Remove the electrical parts box.
  • Page 50 OPERATING PROCEDURE PHOTOS 10. Removing the high pressure switch (63H) and low Photo 8 pressure switch (63L) (1) Remove the service panel. (See Photo 1) (2) Remove the top panel. (See Photo 1) (3) Remove 3 right side panel fixing screws (5 × 12) in the rear of the unit and remove the right side panel.
  • Page 51 OPERATING PROCEDURE PHOTOS Photo 10 12. Removing the power receiver (1) Remove the service panel. (See Photo 1) Power receiver (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 52 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Sep. 2012 No. OCH534 New publication, effective Sep. 2012 Made in Japan Specifications are subject to change without notice.

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Mr. slim pu-shw230yka

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