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Mitsubishi Electric PUZ-WZ50VAA Service Manual
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Mitsubishi Electric PUZ-WZ50VAA Service Manual

Mitsubishi Electric PUZ-WZ50VAA Service Manual

Air to water heat pump units, outdoor unit, salt proof, r290
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AIR TO WATER HEAT PUMP UNITS
SERVICE MANUAL
<Outdoor unit>
[Model Name]
PUZ-WZ50VAA
PUZ-WZ60VAA
PUZ-WZ80VAA
Salt proof model
PUZ-WZ50VAA-BS
PUZ-WZ60VAA-BS
PUZ-WZ80VAA-BS
PUZ-WZ50VAA.UK
[Service Ref.]
PUZ-WZ50VAA.UK
PUZ-WZ60VAA.UK
PUZ-WZ80VAA.UK
PUZ-WZ50VAA-BS.UK
PUZ-WZ60VAA-BS.UK
PUZ-WZ80VAA-BS.UK
R290
CONTENTS
1. REFERENCE MANUAL ································ 2
2. SAFETY PRECAUTION ······························· 3
3. SPECIFICATIONS ······································ 22
4. DATA ··························································· 23
5. OUTLINES AND DIMENSIONS·················· 24
6. WIRING DIAGRAM ····································· 26
7. WIRING SPECIFICATIONS ························ 28
8. REFRIGERANT SYSTEM DIAGRAM ········ 29
9. TROUBLESHOOTING ································ 31
10. MONITORING THE OPERATION DATA BY
THE REMOTE CONTROLLER ··················· 69
11. DISASSEMBLY PROCEDURE ··················· 75
PARTS CATALOG (OCB816)
June 2023
No. OCH816
Note:
• This manual describes
service data of the outdoor
units only.

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Summary of Contents for Mitsubishi Electric PUZ-WZ50VAA

  • Page 1 AIR TO WATER HEAT PUMP UNITS June 2023 No. OCH816 SERVICE MANUAL R290 <Outdoor unit> Note: [Model Name] [Service Ref.] • This manual describes PUZ-WZ50VAA.UK PUZ-WZ50VAA service data of the outdoor units only. PUZ-WZ60VAA.UK PUZ-WZ60VAA PUZ-WZ80VAA.UK PUZ-WZ80VAA Salt proof model PUZ-WZ50VAA-BS.UK PUZ-WZ50VAA-BS PUZ-WZ60VAA-BS.UK...
  • Page 2 REFERENCE MANUAL INDOOR UNIT SERVICE MANUAL 1-1. FOR AIR TO WATER SYSTEM Service Model name Service ref. manual No. EHPT17X-VM2E EHPT17X-VM2E.UK ERPT17X-VM2E EHPT17X-VM6E.UK EHPT17X-VM6E EHPT17X-YM9E.UK EHPT17X-YM9E ERPT17X-VM2E.UK EHPT20X-YM9E EHPT20X-YM9E.UK EHPT20X-TM9E EHPT20X-TM9E.UK EHPT20X-MEHEW EHPT20X-MEHEW.UK OCH814 ERPT20X-VM2E ERPT20X-VM2E.UK OCB814 ERPT20X-VM6E ERPT20X-VM6E.UK ERPT20X-YM9E ERPT20X-YM9E.UK EHPT30X-YM9EE EHPT30X-YM9EE.UK...
  • Page 3 Use of electric devices prosecution, water leakage, electric shock or fire. (smartphone, notebook, tablet) Mitsubishi Electric does not accept responsibility for any direct, indirect, special or consequential loss, damage, liability or expense incurred or suffered which results from any works undertaken by Handle tools with care.
  • Page 4 [1] R290 Refrigerant Properties (1) Properties of refrigerants. R290 refrigerant is classified as class A3 in the safety group of ISO817 because it has low toxicity (class A) and higher flammability (class 3). It is highly flammable and MUST be handled safely to prevent fire and explosion. R290 R410A Chemical formula...
  • Page 5 Mitsubishi Electric does not accept responsibility for any direct, indirect, special or consequential loss, damage, liability or expense incurred or suffered which results from any works undertaken by an unqualified or third party installer, or any failure, claim, damage or deficiency caused to a unit by improper installation, servicing, reloca- tion, repair or disposing.
  • Page 6 (31) In order to not invalidate unit warranty and maintain the correct and safe functioning of the unit, please use only parts and accessories recommended by Mitsubishi Electric, to be installed by a competent electrician with the requisite professional qualifications in your jurisdiction. We accept no liability for damage or expenses caused by the incorrect installation of the unit and/or third party accessories, parts or components, which may result in water leakage, electric shock or fire.
  • Page 7 [3] Cautions for service (1) After completing service, charge the cycle with specified amount of refrigerant. (2) When performing service, install a filter drier simultaneously. Be sure to use a filter drier for new refrigerant. [4] Safety requirement and work procedure of the repair service for unit using R290 refrigerant. Observe the following safety requirements, precautions, and work procedures to perform the repair services.
  • Page 8 • Keep ignition sources away from outdoor units containing R290 refrigerant. Even in a well ventilated environment, do not bring ignition sources into the Protected Zone described in section 2.7. • Do not smoke during work and transportation. (1-7) Ventilated Area Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work.
  • Page 9 The appliance shall be installed in accordance with national wiring regulations. The terminal block cover panel of the outdoor unit must be firmly attached. If the cover panel is mounted incorrectly and dust and moisture enter the unit, electric shock or fire may result. (5) Detection of Flammable Refrigerants Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks.
  • Page 10 (9) Remove the repair parts of the outdoor unit Be sure to work according to the section "11 DISASSEMBLY PROCEDURE" of this service manual. (10) Brazing a new parts • Processing brazing connections Conduct appropriate brazing as shown in the following table. <Minimum insertion depth and gap for copper pipe joints>...
  • Page 11 Brazing filler metal Brazing filler Brazing filler metal metal Downward Horizontally Upward Make sure to prevent fire. (Cover area around brazing point and prepare fire extinguisher/water.) Take care to avoid burning yourself. Confirm that the pipe and joint gap is appropriate to prevent leakage. (11) Airtightness Test In order to pressurize the refrigerant piping to the air conditioner's designed pressure using nitrogen gas, connect equip- ment as shown in the following diagram.
  • Page 12 substances even when a small amount of moisture is present. It is necessary to remove a sufficient level of moisture using a vacuum pump (0.5 Torr or less). Compound gauge Gauge manifold Valve on low-pressure side (blue) (Open) Valve on high-pressure side (red) (Closed) Blue Yellow Bourdon tube vacuum gauge...
  • Page 13 • mechanical handling equipment is available, if required, for handling refrigerant cylinders; • all personal protective equipment is available and being used correctly; • the recovery process is supervised at all times by a competent person; • recovery equipment and cylinders conform to the appropriate standards. d) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system.
  • Page 14 Fresh Outside MAX Fan Volume Air Intake Mode 3. Be sure to carry the R290 detector and keep it working properly. (17) Parts inspection and regular replacement In addition to annual servicing, it is necessary to replace or inspect some parts after a certain period of system opera- tion.
  • Page 15 [5] Service tools Use the below service tools for R290 refrigerant. Can other refrigerant tools be used? Tool name Specifications R410A Be sure to use a gauge manifold compliant with R290 Gauge manifold Select it that can be used in the operating range of -0.1 to 3.2 MPaG Port size: 7/16 UNF 20 thread Be sure to use a charge hose compliant with R290.
  • Page 16 2-3. PRECAUTIONS FOR SALT PROOF TYPE "-BS" MODEL Although "-BS" model has been designed to be resistant to salt damage, observe the following precautions to maintain the performance of the unit. 1. Avoid installing the unit in a location where it will be exposed directly to seawater or sea breeze. 2.
  • Page 17 2-5. Minimum installation area If you unavoidably install a unit in a space where all four sides are blocked or there are depressions, confirm that one of these situations (A, B or C) is satisfied. Note: These countermeasures are for keeping safety not for specification guarantee. A) Secure sufficient installation space (minimum installation area Amin).
  • Page 18 If you are concerned about a possible refrigerant leak from your unit, please contact your installer/supplier immediately or contact Mitsubishi Electric in your region directly for more information. A protective zone must be maintained around the area closest to the unit. See shaded in Fig. 2-2.
  • Page 19 • Specific dimensions of the protective zone are specified for each installation condition. Refer to the figures for each case. (1) When installed in a location with an open around (Fig. 2-3) Define the protective zone as follows: - 1 m around of the unit - 0.3 m from the ground.
  • Page 20 (4) When installed in a location where only the front opened (building walls on both sides) Where the distance between both sides of the unit and the wall is more than 1 m, define the protective zone as follows: (Fig. 2-6) - 1 m to the sides and to the front of the unit - the rear of the unit to the wall - 0.3 m from the ground.
  • Page 21 2-7. Water piping work [1] Water piping connection (Fig. 2-8) • Connect the water pipes to the outlet and inlet pipes. (Parallel male screw for 1-inch water pipe (ISO 228/1-G1B)) • Inlet and outlet pipes position is shown on the Fig. 2-8. •...
  • Page 22 SPECIFICATIONS 3-1. SPECIFICATIONS PUZ-WZ50VAA.UK PUZ-WZ60VAA.UK PUZ-WZ80VAA.UK Service Ref. PUZ-WZ50VAA-BS.UK PUZ-WZ60VAA-BS.UK PUZ-WZ80VAA-BS.UK Power source (Phase, cycle, voltage) Single, 50 Hz, 230 V Single, 50 Hz, 230 V Single, 50 Hz, 230 V Max. current 13.0 13.0 22.0 External finish Munsell: N8.75 Munsell N2.75 (FRONT PANEL)
  • Page 23 DATA NOISE CRITERION CURVES PUZ-WZ50VAA.UK PUZ-WZ50VAA-BS.UK SPL(dB) MODE LINE COOLING HEATING MICROPHONE NC-70 UNIT NC-60 1.5 m NC-50 GROUND NC-40 NC-30 APPROXIMATE THRESHOLD OF HEARING FOR NC-20 CONTINUOUS NOISE 1000 2000 4000 8000 BAND CENTER FREQUENCIES, Hz PUZ-WZ60VAA.UK PUZ-WZ80VAA.UK PUZ-WZ60VAA-BS.UK PUZ-WZ80VAA-BS.UK...
  • Page 24 OUTLINES AND DIMENSIONS PUZ-WZ50VAA.UK PUZ-WZ60VAA.UK PUZ-WZ50VAA-BS.UK PUZ-WZ60VAA-BS.UK Unit: mm OCH816...
  • Page 25 PUZ-WZ80VAA.UK PUZ-WZ80VAA-BS.UK Unit: mm OCH816...
  • Page 26 WIRING DIAGRAM PUZ-WZ50VAA.UK PUZ-WZ60VAA.UK PUZ-WZ50VAA-BS.UK PUZ-WZ60VAA-BS.UK OCH816...
  • Page 27 PUZ-WZ80VAA.UK PUZ-WZ80VAA-BS.UK [LEGEND] SYMBOL NAME SYMBOL NAME Terminal Block<Power Supply, Indoor/Outdoor> FUSE Fuse <T20AL250V> Motor for INV Compressor Run Capacitor Motor for FIX Compressor Contactor Fan Motor P.B. Power Circuit Board 21S4 Solenoid Valve(4-Way Valve) C. B. Controller Circuit Board High Pressure Switch INV Switch <Manual Defrost, Defect History High Pressure Switch FIX...
  • Page 28 WIRING SPECIFICATIONS FIELD ELECTRICAL WIRING (power wiring specifications) WZ50V WZ60V WZ80V Outdoor unit model ~/N (single), 50 Hz, 230 V Outdoor unit power supply 16 A 16 A 25 A Outdoor unit input capacity Main switch (Breaker) *1 3 × Min 1.5 3 ×...
  • Page 29 Refrigerant flow in cooling Symbol Parts name Detail INV. Comp Compressor DC inverter scroll compressor (Mitsubishi Electric Corporation) H/P SW High pressure switch (63H) For protection (OFF: 3.20MPa) REV/V Reversing (4-way) valve (21S4) Change the refrigerant circuit (Heating / Cooling) and for Defrosting...
  • Page 30 Refrigerant flow in cooling Refrigerant flow in heating Symbol Part name Detail INV. Comp Compressor DC inverter twin rotary compressor (Mitsubishi Electric Corporation) FIX. Comp Compressor Fixed speed single compressor (Mitsubishi Electric Corporation) H/P SW1 High pressure switch (63H) For protection (OFF: 3.20MPa)
  • Page 31 TROUBLESHOOTING 9-1. 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 32 9-2. SELF-DIAGNOSIS ACTION TABLE Note: Refer to indoor unit section for code P, code E, and Code L. <Abnormalities detected when the power is turned on> Check code Abnormal points and detection method Cause judgment and action No voltage is supplied to terminal Check following items.
  • Page 33 Check code Abnormal points and detection method Cause judgment and action Indoor/outdoor unit connector Contact failure or miswiring of Check disconnection or looseness or polarity miswiring, excessive number of units (2 indoor/outdoor unit connecting wire of indoor/outdoor unit connecting wire of units or more) indoor and outdoor units.
  • Page 34 Check code Abnormal points and detection method Cause judgment and action High pressure (High pressure switch Short cycle of indoor unit – Check indoor unit and repair defect. 63H operated) Clogged filter of indoor unit Decreased airflow caused by Abnormal if high pressure switch 63H dirt of indoor fan operated (3.2 MPa) during compressor Dirt of indoor heat exchanger...
  • Page 35 Check code Abnormal points and detection method Cause judgment and action Open/short of outdoor unit thermistors Disconnection or contact failure Check connection of connector (TH3, TH34, (TH3, TH34, TH6, TH7, TH8, TH32 and of connectors TH7/6, TH32, TH35) on the outdoor controller TH35) Outdoor controller circuit board: circuit board.
  • Page 36 Check code Abnormal points and detection method Cause judgment and action Failure in the operation of the DC Check or replace the DC fan motor. Outdoor fan motor fan motor Abnormal if rotational frequency of the fan motor Check the voltage of the outdoor circuit Failure in the outdoor circuit control- is not detected during DC fan motor operation.
  • Page 37 Continued from the previous page. Check code Abnormal points and detection method Cause judgment and action PFC error (Overvoltage/ Abnormal increase in power Check the field facility for the power supply. Detailed Undervoltage/Overcurrent) source voltage codes Decrease in power source •...
  • Page 38 Check code Abnormal points and detection method Cause judgment and action Low pressure (INV) Leakage or shortage of Check intake superheat. Abnormal if following conditions are refrigerant Check leakage of refrigerant. detected after compressor starts heating Malfunction of linear expansion Check linear expansion valve.
  • Page 39 Check code Abnormal points and detection method Cause judgment and action Remote controller control board Defective remote controller Replace remote controller. Abnormal if data cannot be normally read from the nonvolatile memory of the remote controller control board. (Check code: E1) (6201 Abnormal if the clock function of remote controller cannot be normally operated.
  • Page 40 Check code Abnormal points and detection method Cause judgment and action Indoor/outdoor unit communication error Contact failure of indoor/ Check disconnection or looseness of indoor/ (Signal receiving error) (Outdoor unit) outdoor unit connecting wire outdoor unit connecting wire of indoor or Abnormal if outdoor controller circuit board outdoor units.
  • Page 41 Check code Abnormal points and detection method Cause judgment and action Pipe temperature Leakage or shortage of Check intake superheat. Abnormal if the following conditions are refrigerant Check leakage of refrigerant. detected for continuously 3 minutes after compressor starts operating for 10 minutes. Malfunction of linear expansion Check linear expansion valve.
  • Page 42 9-3. TROUBLESHOOTING OF PROBLEMS Phenomena Factor Countermeasure 1. Remote controller display does not 12 V DC is not supplied to remote controller. Check LED2 on indoor controller board. work. (1) When LED2 is lit. Check the remote controller wiring for break- ing or contact failure.
  • Page 43 Phenomena Factor Countermeasure 7. A large amount of water is drained 1 Water is drained from PRV because of the 1 Check the below items following the indoor unit from the outdoor unit. pressure rise in water circuit. manual to suppress the pressure rise in water circuit.
  • Page 44 Symptoms: “PLEASE WAIT” is kept being displayed on the remote controller. Inspection method and Diagnosis flow Cause troubleshooting Check the display time of “PLEASE WAIT” after turning on the main power. 6 minutes 2 minutes or more or less How long is “PLEASE WAIT” •...
  • Page 45 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller. 1 LED1 : LED2 : LED3 : Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block of the indoor unit which is used to connect the indoor unit and the outdoor unit.
  • Page 46 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller. 2 LED1 : LED2 : LED3 : Inspection method and Diagnosis flow Cause troubleshooting Check the voltage between S1 and S2 on the terminal block of the indoor unit which is used to connect the indoor unit and the outdoor unit.
  • Page 47 LED display of the indoor controller board Symptoms: Nothing is displayed on the remote controller. 3 LED1 : LED2 : LED3 : — Inspection method and Diagnosis flow Cause troubleshooting Check the voltage of the terminal block (TB6) of the remote controller. 10 to 16 V DC? •...
  • Page 48 LED display of the Symptoms: LED display is kept being blinked on the remote controller remote controller Inspection method and Diagnosis flow Cause troubleshooting Check the abnormal code by connecting an optional part “A-Control Service Tool (PAC-SK52ST)” to connector CNM on outdoor controller board.
  • Page 49 9-4. HOW TO CHECK THE PARTS Checkpoints Parts name Thermistor (TH3) Disconnect the connector then measure the resistance with a tester. <Liquid> (At the ambient temperature 10 to 30˚C) Thermistor (TH4) Normal Abnormal <Discharge> Thermistor (TH6) 160 to 410 kΩ <Two-phase pipe>...
  • Page 50 Check method of DC fan motor (fan motor/outdoor controller circuit board) Notes · High voltage is applied to the connector (CNF1) for the fan motor. Pay attention to the service. · Do not pull out the connector (CNF1) for the motor with the power supply on. board and fan motor.) (It causes trouble of the outdoor controller circuit Self check...
  • Page 51 <Thermistor feature chart> Low temperature thermistors • Thermistor <Liquid> (TH3) • Thermistor <Two-phase pipe> (TH6) • Thermistor <Ambient> (TH7) • Thermistor <Liquid> (TH32) • Thermistor <Plate hex liquid>( TH34) • Thermistor <Suction pipe> (TH35) Thermistor R0 = 15 kΩ ± 3 % B constant = 3480 ±...
  • Page 52 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 53 (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 54 9-6. TEST POINT DIAGRAM Outdoor controller circuit board PUZ-WZ50VAA.UK PUZ-WZ60VAA.UK PUZ-WZ80VAA.UK PUZ-WZ50VAA-BS.UK PUZ-WZ60VAA-BS.UK PUZ-WZ80VAA-BS.UK <CAUTION> TEST POINT1 is high voltage. CNDM 1–2: Manual defrost, defect Input of low-level sound priority mode history record reset, CN51 1–3: refrigerant address External signal output...
  • Page 55 Outdoor compressor protector board PUZ-WZ80VAA.UK PUZ-WZ80VAA-BS.UK Connect to the earth LO, NO Voltage of 230 V AC is output (Connect to the contactor (L1, L3)) 230 V AC Connect to the contactor (A1, A2) CN51 Connect to the outdoor con- troller circuit board (CN51) CNPCS...
  • Page 56 Outdoor power circuit board Brief Check of DIP-IPM and DIODE MODULE If they are short-circuited, it means that they are broken. PUZ-WZ50VAA.UK Measure the resistance in the following points (connectors, etc.). PUZ-WZ50VAA-BS.UK 1. Check of DIP-IPM PUZ-WZ60VAA.UK P2 - U2 , P2 - V2 , P2 - W2 , N2 - U2 , N2 - V2 , N2 - W2 PUZ-WZ60VAA-BS.UK...
  • Page 57 9-7. FUNCTION OF SWITCHES, CONNECTORS AND JUMPERS (1) Function of switches Type Action by the switch operation ■ The black square ( ) indicates a switch position. Switch Function Effective timing switch Action by the switch operation Type of When compressor is wor Switch Function Effective timing...
  • Page 58 Set DIP switch SW7-4, 5 in the following case. - (for WZ80 only) Current supply to the outdoor unit or power consumption in the outdoor unit is limited. ■ The black square ( ) indicates a switch position. Current limitation SW7 Setting /power consumption limitation (Default setting)
  • Page 59 <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 detail by connecting an optional part “A-Control Service Tool (PAC-SK52ST)” to connector CNM on outdoor controller board.
  • Page 60 Indication Error Outdoor controller board Detailed Check Contents Inspection method reference code* LED1 (Green) LED2 (Red) page 3 blinking 1 blinking 1Check if stop valves are open. Abnormality of discharging 2Check if connectors (TH4, LEV-A, and LEV-B) on outdoor controller temperature (TH4) and Comp.
  • Page 61 <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 control- ling DIP SW2 on “'A-Control Service Tool'”.
  • Page 62 ■ 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°C or below, “–” and temperature are displayed by turns.) °C (Example) When −10°C;...
  • Page 63 ■ 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°C or below, “–” −40 to 90 and temperature are displayed by turns.) °C (Example) When −15°C;...
  • Page 64 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Capacity setting display Displayed as an outdoor capacity code. Capacity Code WZ50 Code display WZ60 2 3 4 5 6 WZ80 Outdoor unit setting information •...
  • Page 65 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Outdoor heat sink temperature (TH8) −40 to 200 −40 to 200 (When the temperature is 0°C or less, “–” and temperature are displayed by turns.) °C (When the thermistor detects 100°C or more, hundreds digit, tens digit and ones digit are...
  • Page 66 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit Error postponement code history (3) Postponement code display of outdoor unit Blinking: During postponement Lighting: Cancellation of postponement Code “00” is displayed in case of no postponement. display 2 3 4 5 6 When no error history, “0”...
  • Page 67 ■ The black square ( ) indicates a switch position. SW2 setting Display detail Explanation for display Unit 2-phase pipe temperature thermistor −40 to 90 (TH6) (When the temperature is 0°C or less, “–” and -40 to 90 temperature are displayed by turns.) (Example) When −15°C;...
  • Page 68 ■ The black square ( ) indicates a switch position. Explanation for display Unit SW2 setting Display detail Comp. surface temperature (TH33) −52 to 221 −52 to 221 (When the temperature is 0°C or less, "–" and tem- perature are displayed by turns.) (When the discharge thermistor detects 100°C or more, hundreds digit, tens digit, and ones digit are °C...
  • Page 69 MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER 10-1. 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...
  • Page 70 Description Request content Unit Remarks (Display range) Outdoor unit-Control state Refer to 10-1-1.Detail Contents in Request Code. – Compressor-Frequency control state Refer to 10-1-1.Detail Contents in Request Code. – Outdoor unit-Fan control state Refer to 10-1-1.Detail Contents in Request Code. –...
  • Page 71 Description Request content Unit Remarks (Display range) Displays error history. 103 Error history 1 (latest) Code (" --" is displayed if no history is present.) Displays error history. 104 Error history 2 (second to last) Code (" --" is displayed if no history is present.) Displays error history.
  • Page 72 10-1-1. 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 73 [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 74 [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 75 DISASSEMBLY PROCEDURE PUZ-WZ50VAA.UK PUZ-WZ60VAA.UK PUZ-WZ50VAA-BS.UK PUZ-WZ60VAA-BS.UK OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the service, top and cover panels Photo 1-1 Top panel fixing screws Note: Be sure to read Section 2 "Safety precaution" of this Top panel manual and perform the work in compliance with this safety requirement before starting the work.
  • Page 76 OPERATING PROCEDURE PHOTOS/FIGURES Front panel 3. Removing the fan motor (MF1) Photo 3-1 (1) Remove the service panel. (See Photo 1-1) Propeller (2) Remove the top panel. (See Photo 1-1) (3) Remove the cover panel fixing screws (1 for front and 1 for right side/ 5 ×...
  • Page 77 OPERATING PROCEDURE PHOTOS/FIGURES Photo 4-6 Photo 4-7 Controller circuit board Terminal block Terminal block fixing screw Edge cover Insulation Photo 4-8 Photo 4-9 Screws Photo 4-10 Photo 4-12 Photo 4-11 Screws 5. Removing the side panel (R) Photo 5-1 Remove the service panel. (See Photo 1-1) Screws Remove the top panel.
  • Page 78 OPERATING PROCEDURE PHOTOS/FIGURES Photo 6-1 6. Removing the thermistors Photo 6-2 (1) Remove the service panel and cover panel. (See Photo 1-1) (2) Remove the side panel (R). (See Photo 5-1, 5-2) (3) Remove the lid of the soundproof cover.*1 (See Photo 6-1) (4) Remove the thermistors.*2 (See Photo 6-2, 6-3, 6-4) •...
  • Page 79 OPERATING PROCEDURE PHOTOS/FIGURES Photo 8-1 8. Removing the 4-way valve, LEV (LEV-A, LEV-B), high pres- sure switch and pressure sensor Note: Be sure to perform the work in compliance with Section 2 "safety precaution" of this manual and check the following. •...
  • Page 80 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing the compressor (MC) Photo 9-1 Note: Be sure to perform the work in compliance with Section 2 "Safety precaution" of this manual and check the following. Damper of dis- • The power-supply breaker of the appliance is turned off. charge pipe •...
  • Page 81 OPERATING PROCEDURE PHOTOS/FIGURES 10. Removing the air separator Photo 10 Remove the inlet and outlet water pipe.*1 (See Photo 5-1) Air separator Remove the service panel, top panel and cover panel. (See Photo 1-1) Remove the side panel (R). (See Photo 5-1, 5-2) Fasteners Remove the fasteners of the air separator.
  • Page 82 PUZ-WZ80VAA.UK PUZ-WZ80VAA-BS.UK OPERATING PROCEDURE PHOTOS/FIGURES 1. Removing the service, top and cover panels Photo 1-1 Top panel fixing screws Note: Be sure to read Section 2 "Safety precaution" of this manual and perform the work in compliance with this Top panel safety requirement before starting the work.
  • Page 83 OPERATING PROCEDURE PHOTOS/FIGURES Photo 3-1 3. Removing the fan motor (MF1) Front panel (1) Remove the service panel. (See Photo 1-1) Propeller (2) Remove the top panel. (See Photo 1-1) (3) Remove the cover panel fixing screws (1 for front and 1 for right side/5 ×...
  • Page 84 OPERATING PROCEDURE PHOTOS/FIGURES [TERMINAL BLOCK] Photo 4-7 Photo 4-8 (19) Remove the lead wire L/N, Earth, CNS on the terminal block. Contactor fixing screw (See Photo 4-11) Lead wire of 52C (20) Remove the terminal block fixing screw. (See Photo 4-11) [REACTOR] Lead wire of LO/NO Lead wire of RUN...
  • Page 85 OPERATING PROCEDURE PHOTOS/FIGURES 6. Removing the thermistors Photo 6-1 (1) Remove the service panel and cover panel. (See Photo 1-1) (2) Remove the side panel (R). (See Photo 5-1, 5-2) (3) Remove the lid of the soundproof cover.*1 (See Photo 6-1) (4) Remove the thermistors.*2 (See Photo 6-2, 6-3, 6-4) •...
  • Page 86 OPERATING PROCEDURE PHOTOS/FIGURES 7. Removing the 4-way valve coil with wiring of H.P. Switch, Photo 7-1 LEV coil(LEV-A, LEV-B, LEV-C) and Thermal protector (1) Remove the service panel. (See Photo 1-1) [Removing the 4-way coil with wiring of H.P. Switch] (2) Remove the 4-way valve coil fixing screw (1 for front/ M5) to 4-way valve coil remove the 4-way valve coil.
  • Page 87 OPERATING PROCEDURE PHOTOS/FIGURES 8. Removing the 4-way valve, LEV (LEV-A, LEV-B, LEV-C) and Photo 8-1 high pressure switch and pressure sensor 4-way valve Note: Be sure to perform the work in compliance with Section 2 "Safety precaution" of this manual and check the following. •...
  • Page 88 OPERATING PROCEDURE PHOTOS/FIGURES 9. Removing the compressor (MC) Photo 9-1 Damper of dis- charge pipe Note: Be sure to perform the work in compliance with Section 2 Lead wire "Safety precaution" of this manual and check the following. • The power-supply breaker of the appliance is turned off. INV.
  • Page 89 OPERATING PROCEDURE PHOTOS/FIGURES 10. Removing the air separator Photo 10 Remove the inlet and outlet water pipe.*1 (See Photo 5-1) Air separator Remove the service panel, top panel and cover panel. (See Photo 1-1) Fasteners Remove the side panel R. (See Photo 5-1, 5-2) Remove the fasteners of the air separator.
  • Page 90 HEAD OFFICE: TOKYO BUILDING, 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN ©Copyright 2023 MITSUBISHI ELECTRIC CORPORATION Published: Jun. 2023 No. OCH816 Specifications are subject to change without notice. Made in Japan...
  • Page 91 Related Links Model Number: PUZ-WZ80VAA PUZ-WZ(50-60-80)VAA Service Manual (OCH816)

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