Mitsubishi Electric PUHZ-W85VAA User manual

SERVICE MANUAL
No. OCH681
R410A
April 2018
PARTS CATALOG (OCB681)
[Model Name]
PUHZ-W85VAA
PUHZ-W112VAA
PUHZ-W85YAA
PUHZ-W112YAA
CONTENTS
1. REFERENCE MANUAL································ 2
2. SAFETY PRECAUTION ······························· 3
3. SPECIFICATIONS ········································ 5
4. DATA····························································· 6
5. OUTLINES AND DIMENSIONS···················· 7
6. WIRING DIAGRAM······································· 8
7. WIRING SPECIFICATIONS ························ 10
8. REFRIGERANT SYSTEM DIAGRAM ········ 11
9. TROUBLESHOOTING································ 13
10. MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER ···· 50
11. DISASSEMBLY PROCEDURE··················· 56
Note:
• This manual describes
service data of the outdoor
units only.
AIR TO WATER HEAT PUMP UNITS
[Service Ref.]
PUHZ-W85VAA.UK
PUHZ-W112VAA.UK
PUHZ-W85YAA.UK
PUHZ-W112YAA.UK

2
OCH681
INDOOR UNIT SERVICE MANUAL
1-1. FOR AIR TO WATER SYSTEM
Model name Service ref. Service
manual No.
EHPT20X-VM2HB
EHPT20X-VM6HB
EHPT20X-YM9HB
EHPT20X-TM9HB
EHPT20X-VM6B
EHPT20X-YM9B
EHPT20X-VM2HB.UK
EHPT20X-VM6HB.UK
EHPT20X-YM9HB.UK
EHPT20X-TM9HB.UK
EHPT20X-VM6B.UK
EHPT20X-YM9B.UK
OCH531
OCB531
EHPX-VM2B
EHPX-VM6B
EHPX-YM9B
EHPX-VM2B.UK
EHPX-VM6B.UK
EHPX-YM9B.UK
OCH532
OCB532
EHPX-VM2C
EHPX-VM6C
EHPX-YM9C
EHPX-VM2CR2.UK
EHPX-VM6CR2.UK
EHPX-YM9CR2.UK
OCH571
OCB571
EHPT20X-VM2C
EHPT20X-VM6C
EHPT20X-YM9C
EHPT20X-TM9C
EHPT20X-MHCW
EHPT20X-VM2C2
EHPT20X-VM2CR2.UK
EHPT20X-VM6CR2.UK
EHPT20X-YM9CR2.UK
EHPT20X-TM9CR2.UK
EHPT20X-MHCWR2.UK
EHPT20X-VM2C2R2.UK
OCH570
OCB570
PAC-IF011B-E
PAC-IF032B-E
PAC-IF011B-E
PAC-IF032B-E OCB427
PAC-IF061B-E PAC-IF061B-ER2 OCB572
PAC-SIF051B-E PAC-SIF051B-ER2 OCB536
1REFERENCE MANUAL

3
OCH681
2SAFETY PRECAUTION
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
Charge refrigerant from liquid phase of gas cylinder.
If the refrigerant is charged from gas phase, composition change may occur in refrigerant and the efficiency
will be lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22, etc.) is used, chlorine in refrigerant can cause deterioration of refrigerant oil, etc.
Use a vacuum pump with a reverse flow check valve.
Vacuum pump oil may flow back into refrigerant cycle and that can cause deterioration of refrigerant oil, etc.
Use the following tools specifically designed for use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can cause deterioration of refrigerant oil or malfunction
of compressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigerant will change and the efficiency will be lowered.
Electronic refrigerant charging scale
Vacuum pump adaptor
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Ventilate the room if refrigerant leaks during operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
Use the specified refrigerant only.
2-1. 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 heat pump units, turn off the power-supply breaker.
• Discharge the condenser before the work involving the electric parts.
Precautions during the repair service.
• Do not perform the work involving the electric parts with wet hands.
• Do not pour water into the electric parts.
• Do not touch the refrigerant.
• Do not touch the hot or cold areas in the refrigerating cycle.
• When the repair or the inspection of the circuit needs to be done without turning off the power,
exercise great caution not to touch the live parts.
2SAFETY PRECAUTION 2SAFETY PRECAUTION

4
OCH681
Electronic weighing scale
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
[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.
(4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.
[2] Additional refrigerant charge
When charging directly from cylinder
(1) Check that cylinder for R410A on the market is a syphon type.
(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
No. Tool name Specifications
1Gauge manifold
· Only for R410A
· Use the existing fitting specifications. (UNF1/2)
· Use high-tension side pressure of 5.3 MPa·G or over.
2Charge hose · Only for R410A
· Use pressure performance of 5.09 MPa·G or over.
3Electronic weighing scale —
4Gas leak detector · Use the detector for R134a, R407C or R410A.
5Adaptor for reverse flow check · Attach on vacuum pump.
6Refrigerant charge base —
7Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)
· Cylinder with syphon
8Refrigerant recovery equipment —

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OCH681
3SPECIFICATIONS
Service Ref. PUHZ-W85VAA.UK PUHZ-W85YAA.UK
OUTDOOR UNIT
Power source (Phase, cycle, voltage) Single, 50 Hz, 230 V 3-Phase, 50 Hz, 400 V
Max. current A22.0 11.5
External nish Munsell: N8.75
Munsell N2.75 (FRONT PANEL)
Refrigerant control Linear Expansion Valve
Compressor Hermetic
Model SNB220FEGMC-L1 SNB220FEAMC-L1
Motor output kW 1.5
Starter type Inverter
Protection devices HP switch, Comp. surface thermo
Discharge thermo, Over current detection
Crankcase heater W —
Heat exchanger Plate n coil
Fan Fan (drive) × No. Propeller fan x 1
Fan motor output kW 0.074
Air ow
K/min (CFM)
44(1,550)
Defrost method Reverse cycle
(PWL)Sound power level Heating dB 58
Dimensions W mm (inch) 1050 (41-5/16)
D mm (inch) 480 (18-7/8)
H mm (inch) 1020 (40-3/16)
Weight kg (lb) 97 (214) 110 (243)
Refrigerant R410A
Charge kg (lb) 2.4 (5.3)
Oil (Model) L 0.60(FV50S)
Water pipe connection G1(ISO 228/1)
Service Ref. PUHZ-W112VAA.UK PUHZ-W112YAA.UK
OUTDOOR UNIT
Power source (Phase, cycle, voltage) Single, 50 Hz, 230 V 3-Phase, 50 Hz, 400 V
Max. current A28.0 13.0
External nish Munsell: N8.75
Munsell N2.75 (FRONT PANEL)
Refrigerant control Linear Expansion Valve
Compressor Hermetic
Model DNB28FBAMT DNB28FBBMT
Motor output kW 2.2
Starter type Inverter
Protection devices HP switch, LP switch, Comp. surface thermo
Discharge thermo, Over current detection
Crankcase heater W —
Heat exchanger Plate n coil
Fan Fan (drive) × No. Propeller fan x 1
Fan motor output kW 0.2
Air ow
K/min (CFM)
50 (1,760)
Defrost method Reverse cycle
(PWL)Sound power level Heating dB 60
Dimensions W mm (inch) 1050 (41-5/16)
D mm (inch) 480 (18-7/8)
H mm (inch) 1020 (40-3/16)
Weight kg (lb) 118 (260) 131 (289)
Refrigerant R410A
Charge kg (lb) 3.3 (7.3)
Oil (Model) L 1.0 (FVC68D)
Water pipe connection G1(ISO 228/1)