Mitsubishi Electric PUHZ-SHW230YKAR1 Service Manual
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Mitsubishi Electric PUHZ-SHW230YKAR1 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
PUHZ-SHW230YKAR1
REVISED EDITION-A
Revision:
• Added
PUHZ-SHW230YKAR1
in REVISED EDITION-A.
• Some descriptions have
been modified.
• Please void OCH534.
Note:
• This manual describes
service data of the outdoor
unit only.
• Refer to Technical manual
of ATW, I/F and FTC.
• RoHS compliant products
have <G> mark on the
spec name plate.
CONTENTS
TECHNICAL CHANGES ..................................... 2
1. SAFETY PRECAUTION ................................... 3
2. SPECIFICATIONS ............................................ 6
3. DATA ............................................................... 8
4. OUTLINES AND DIMENSIONS ..................... 10
5. WIRING DIAGRAM ......................................... 11
6. WIRING SPECIFICATIONS ........................... 12
8. TROUBLESHOOTING ................................... 15
9. DISASSEMBLY PROCEDURE ...................... 54
PARTS CATALOG (OCB534)
November 2014
No. OCH534

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Summary of Contents for Mitsubishi Electric PUHZ-SHW230YKAR1

  • Page 1: Table Of Contents

    SPLIT-TYPE, AIR TO WATER HEAT PUMP November 2014 No. OCH534 REVISED EDITION-A SERVICE MANUAL R410A [Model Name] [Service Ref.] Revision: • Added PUHZ-SHW230YKA PUHZ-SHW230YKAR1 PUHZ-SHW230YKA in REVISED EDITION-A. • Some descriptions have PUHZ-SHW230YKAR1 been modified. • Please void OCH534. 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-SHW230YKA PUHZ-SHW230YKAR1 1. Added a new function "Energy Monitor" which allows remote controller to display power consumption and heat output. OCH534A...

  • 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 beaker. •...

  • Page 4: Cautions For Service

    [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 · Check that cylinder for R410A on the market is a syphon type.
  • Page 5 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 and operation check Charge hose...

  • Page 6: Specifications

    SPECIFICATIONS 2-1. SPECIFICATION 2.-1-1. PUHZ-SHW230YKA PUHZ-SHW230YKAR1 <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 7: Outdoor Unit

    2-1-2. Outdoor unit Service Ref. PUHZ-SHW230YKA PUHZ-SHW230YKAR1 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 finish Munsell 3Y 7.8/1.1 Refrigerant control Liner expansion valve Compressor Hermetic scroll Model...

  • Page 8: Data

    Therefore, the amount of additional charge is: 65 × 0.14 + 15 × 0.05 - 4.3 = 5.6 (kg) (Fractions are rounded up) 3-2. NOISE CRITERION CURVES PUHZ-SHW230YKA MODE SPL(dB) LINE COOLING PUHZ-SHW230YKAR1 HEATING MICROPHONE NC-70 UNIT NC-60 NC-50 1.5m NC-40...

  • Page 9: Standard Operation Data

    (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 PUHZ-SHW230YKA Outdoor unit PUHZ-SHW230YKAR1 Phase, Hz 3, 50 Voltage Current 13.7 Discharge pressure Suction pressure Discharge temperature ºC Condensing temperature ºC Suction temperature ºC Evaporating temperature ºC...

  • Page 10: Outlines And Dimensions

    OUTLINES AND DIMENSIONS Unit: mm PUHZ-SHW230YKA PUHZ-SHW230YKAR1 OCH534A...

  • Page 11: Wiring Diagram

    WIRING DIAGRAM PUHZ-SHW230YKA PUHZ-SHW230YKAR1 SYMBOL NAME SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply> FUSE1, FUSE2 Fuse<T15AL250V> Switch<Model Select> Terminal Block<Indoor/Outdoor> CY1, CY2 Capacitor Switch<Function Switch> Motor for Compressor P. B. Power Circuit Board Switch<Function Switch> Fan Motor MF1,MF2 Switch<Function Switch>...

  • 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 hydro box is not allowed. When the hydro box is cunstructed as a slave, remote controller must be connected by crossover wiring.
  • Page 13 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 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) 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 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. 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 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> <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-...
  • 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, TH7/6) (TH3, TH32, TH6, TH7, and TH8) of connectors on the outdoor controller circuit board. Abnormal if open or short is detected Check connection of connector (CN3) on the out- Outdoor controller circuit board: door power 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. Detailed To find out the detail history (latest) about U9 error, turn ON SW2-1, 2-2, 2-6. codes Refer to "8-8. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS". Overvoltage error 1 Abnormal increase in power source 1 Check the field facility for the power supply. • Increase in DC bus voltage to voltage 760 V...
  • 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 (converse 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 10: 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 ■ T hese 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. ■ Clean the filter of water piping. (Flow is reduced when the filter is dirty or Water does not heat or cool well. clogged.) ■...
  • Page 27 8-5. HOW TO CHECK THE PARTS PUHZ-SHW230YKA PUHZ-SHW230YKAR1 Parts name Check points TH3: Liquid pipe Disconnect the connector then measure the resistance with a tester. temperature (At the ambient temperature 10 to 30:) TH4: Discharge temperature Normal Abnormal TH6: 2-phase pipe 160 to 410k"...
  • Page 28 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 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 – 273 )} 15 kΩ 30: 4.3 kΩ 10: 9.6 kΩ 40: 3.0 kΩ 20: 6.3 kΩ 25: 5.2 kΩ −20 −10 0 10 20 30 40 50 Temperature (:) High temperature thermistor • Thermistor <Discharge> (TH4)

  • Page 30: Linear Expansion Valve

    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> Outdoor controller board 12 V DC Gray...
  • 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: Test Point Diagram

    8-7. TEST POINT DIAGRAM Outdoor controller circuit board PUHZ-SHW230YKA PUHZ-SHW230YKAR1 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 1–2: Input of low-level sound priority mode Test operation 1–3:...

  • Page 33: Power Supply

    Outdoor noise filter circuit board PUHZ-SHW230YKA LI1, LI2, LI3, NI PUHZ-SHW230YKAR1 POWER SUPPLY LI1-LI2/LI-LI3/LI3-LI1 : 400 V AC input LI1-NI/LI2-NI/LI3-NI : 230 V AC input (Connect to the terminal block (TB1)) Connect to the earth CNAC1, CNAC2 Connect to the earth 230 V AC (Connect to the...
  • Page 34 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.). PUHZ-SHW230YKAR1 If they are short-circuited, it means that they are broken. 1. Check of POWER MODULE 1 Check of DIODE circuit...
  • Page 35 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* Start Normal in heating operation.* Abnormal history clear Clear Normal...
  • Page 36 The black square ( ) indicates a switch position. Type of Action by the switch operation Switch Function Effective timing Switch No function — — — Power failure Auto recovery No auto recovery When power supply ON automatic recovery* No function —...
  • Page 37 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 38 <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. [Display] (1)Normal condition Outdoor controller board A-Control Service Tool Unit condition LED1 (Green) LED2 (Red)
  • Page 39 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 40 <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 41 ■ 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:; 2 3 4 5 6 0.5 sec. 0.5sec. 2 sec.
  • Page 42 ■ 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 43 ■ 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 44 ■ 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 heatsink temperature (TH8) −40 to 200 −40 to 200...
  • Page 45 ■ 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%; When there is no setting 0.5 sec. 0.5sec. 2 sec.
  • Page 46 ■ 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 47 ■ 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 48 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 servie manual for how to use the controllers and request codes for indoor unit. Description Request content Unit Remarks (Display range)
  • Page 49 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 50 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 51 8-9-1. Detail Contents in Request Code [Operation state] (Request code :" 0") Relay output state Power currently Data display Display Compressor Four-way valve Solenoid valve supplied to compressor – – – – Relay output state Operation mode Operation mode Display Operation mode STOP •...
  • Page 52 [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 Four-way valve Compressor Display warming up [Error content (U9)] (Request code :"55 ") Data display Error content 1 Error content 2 Error content...
  • Page 53 [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 54: Disassembly Procedure

    DISASSEMBLY PROCEDURE PUHZ-SHW230YKA PUHZ-SHW230YKAR1 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. Grille (2) Remove screws (3 for front, 3 for rear/5 × 12) of the top...

  • Page 55: Operating Procedure

    PHOTOS OPERATING PROCEDURE 4. Removing the thermistor <2-phase pipe> (TH6) Photo 5 Thermistor (1) Remove the service panel. (See Photo 1) <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. parts box (4) Loosen the 2 wire clamps on top of the electrical parts box.
  • Page 56 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. (See Photo 4) [Removing the 4-way valve coil] (4) Remove 4-way valve coil fixing screw (M4 × 6).
  • Page 57 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. (4) Pull out the lead wire of high pressure switch and low pressure switch.
  • Page 58 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. (4) Remove 4 back cover panel fixing screws (5 × 12) and Valve bed fixing screw remove the back cover panel. (5) Remove the electrical parts box. (See Photo 4) (6) Remove 3 valve bed fixing screws (4 × 10) and 4 ball valve and stop valve fixing screws (5 × 16) and then remove the...
  • Page 59 OCH534A...
  • Page 60 HEAD OFFICE : TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN Copyright 2012 MITSUBISHI ELECTRIC CORPORATION Distributed in Nov. 2014 No. OCH534 REVISED EDITION-A Distributed in Sep. 2012 No. OCH534 New publication, effective Nov. 2014 Made in Japan Specifications are subject to change without notice.

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