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 —

5
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)

6
OCH681
4DATA
4-1. COMPRESSOR TECHNICAL DATA
Service Ref. PUHZ-W85VAA.UK PUHZ-W85YAA.UK PUHZ-W112VAA.UK PUHZ-W112YAA.UK
Compressor model SNB220FEGMC-L1 SNB220FEAMC-L1 DNB28FBAMT DNB28FBBMT
Winding
Resistance (Ω)
U-V 0.95 1.65 0.74 0.94
U-W 0.95 1.65 0.74 0.94
W-V 0.95 1.65 0.74 0.94
(at 20:)
4-2. NOISE CRITERION CURVES
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
90
80
70
60
50
40
30
20
10
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
BAND CENTER FREQUENCIES, Hz
COOLING
MODE
HEATING
49
SPL(dB)
47
LINE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
90
80
70
60
50
40
30
20
10
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
BAND CENTER FREQUENCIES, Hz
COOLING
MODE
HEATING
45
SPL(dB)
45
LINE
1.5 m
1 m
MICROPHONE
UNIT
GROUND
PUHZ-W112VAA.UK
PUHZ-W112YAA.UK
PUHZ-W85VAA.UK
PUHZ-W85YAA.UK

7
OCH681
5OUTLINES AND DIMENSIONS
PUHZ-W85VAA.UK PUHZ-W112VAA.UK PUHZ-W85YAA.UK PUHZ-W112YAA.UK
Unit: mm

8
OCH681
6WIRING DIAGRAM
C. B.
21S4
X51 X52
31 21S4
(GN)
SV3/SS
(WH)
31
X54
31 SV1/CH
(GY)
71
MS
3~
5CNF1(WH)
MF1
63H
t°
51LEV-A
(WH)
31
63H
(YE)
31
TH33
(YE)
1 2
t°
14
t° t°
TH3
(WH)
TH7/6
(RD)
LEV-A
M
5
51LEV-B
(RD)
LEV-B
M
5
2 1
t°
TH4
TH4
(WH)
2 1
t°
TH34
TH34
(RD)
63L
31
63L
(RD)
63HS
(WH)
W112
only
TRANS
TH33 TH7 TH6 TH3 63HS
CN4
(WH)
1 3
CNDC
(PK)
1
2
3
CNS
(WH)
31
F2
F1
F3
F4
CNAC
(WH)
1 3
CNDM
(WH)
1 2
2
12
3 4
7
CN2
(RD)
SW4 SW8
SW1
SW9 SW7
SW6
SW5
*1
1 7
SW2
SYMBOL NAME SYMBOL NAME
TB1
MC
MF1
21S4
63H
63L
63HS
TH3
TH4
TH6
TH7
TH8
TH33
TH34
LEV-A, LEV-B
DCL1, DCL2, DCL3
Terminal Block <Power Supply, Indoor/Outdoor>
Motor for Compressor
Fan Motor
Solenoid Valve (4-Way Valve)
High Pressure Switch
Low Pressure Switch
High Pressure Sensor
Thermistor <Liquid>
Thermistor <Discharge>
Thermistor <Plate Hex Liquid>
Thermistor <Ambient>
Thermistor <Heat Sink>
Thermistor <Comp. Surface>
Thermistor <Inlet Water>
Linear Expansion Valve
Reactor
CY1, CY2
P. B.
C. B.
Capacitor
Power Circuit Board
Controller Circuit Board
Switch <Manual Defrost, Defect History
Record Reset, Refrigerant Address>
Switch <Function Switch>
Switch <Function Switch>
Switch <Function Switch>
Switch <Function Switch, Model Select>
Switch <Function Switch>
Switch <Function Switch>
Switch <Function Switch>
Connector <Connection for Option>
Connector <Connection for Option>
Connector <Connection for Option>
Fuse <T6.3AL250V>
SW1
SW2
SW4
SW5
SW6
SW7
SW8
SW9
CNDM
SV1/CH
SV3/SS
F1, F2, F3, F4
P. B.
TO
INDOOR UNIT
OG BNYE
L N S1 S2 S3 TB1
POWER SUPPLY
~/N
230V 50Hz
RD BU
CNAC2
(RD)
CNAC1
(WH)
LI NI
EI
~+
-
E3
IC600
CY1
CY2
U
V
W
RD
BK
WH
MC
MS
3~
DCL1
BK
DCL3
3131
E2
E4
TB1A
TB3A TB1B TB3B
31
CNDC
(PK)
1 2
t°
TH8
CN6
(WH)
1 7
CN2
(RD)
7
CN4
(WH)
2
1
2
2
BK
BK
BK
BK
U
V
WIC500
+
~
RD
DS
GNYE
TB2B
WH
DCL2
TB2A
BK
RD WH
8
8
1 2 3 4 5 6 7
1 2 3 4 5 6 7
OFF
ON
85V
MODEL SW6 *2
OFF
ON
112V
*1 MODEL SELECT
The black square ( ) indicates
a switch position.
*2 SW6 -1 to 3 : Function Switch
LED3
PUHZ-W85VAA.UK PUHZ-W112VAA.UK

9
OCH681
8
8
1 2 3 4 5 6 7
1 2 3 4 5 6 7
OFF
ON
85Y
MODEL SW6 *2
OFF
ON
112Y
*1 MODEL SELECT
The black square ( ) indicates
a switch position.
*2 SW6 -1 to 3 : Function Switch
TB1
TB2
MC
MF1
21S4
63H
63L
63HS
TH3
TH4
TH6
TH7
TH8
TH33
TH34
LEV-A, LEV-B
ACL1, ACL2,
ACL3, ACL4
CY1, CY2
CK
RS
Terminal Block <Power Supply>
Terminal Block <Indoor/Outdoor>
Motor for Compressor
Fan Motor
Solenoid Valve (4-Way Valve)
High Pressure Switch
Low Pressure Switch
High Pressure Sensor
Thermistor <Liquid>
Thermistor <Discharge>
Thermistor <Plate Hex Liquid>
Thermistor <Ambient>
Thermistor <Heat Sink>
Thermistor <Comp. Surface>
Thermistor <Inlet Water>
Linear Expansion Valve
Reactor
Capacitor
Capacitor
Rush Current Protect Resistor
SW1
SW2
SW4
SW5
SW6
SW7
SW8
SW9
CNDM
SV1/CH
SV3/SS
F1, F2,
F3, F4
P. B.
N. F.
CONV. B.
C. B.
Power Circuit Board
Noise Filter Circuit Board
Converter Circuit Board
Controller Circuit Board
Switch <Manual Defrost,
Defect History Record Reset,
Refrigerant Address>
Switch <Function Switch>
Switch <Function Switch>
Switch <Function Switch>
Switch <Function Switch,
Model Select>
Switch <Function Switch>
Switch <Function Switch>
Switch <Function Switch>
Connector <Connection for Option>
Connector <Connection for Option>
Connector <Connection for Option>
Fuse <T6.3AL250V>
SYMBOL NAME SYMBOL NAME
P. B.
N. F.
t°
C. B.
21S4
X51 X52
31 21S4
(GN)
SV3/SS
(WH)
31
X54
31 SV1/CH
(GY)
71
MS
3~
5CNF1(WH)
MF1
63H
t°
51LEV-A
(WH)
31
63H
(YE)
31
TH33
(YE)
1 2
t°
14
t° t°
TH3
(WH)
TH7/6
(RD)
LEV-A
M
5
51LEV-B
(RD)
LEV-B
M
5
2 1
t°
TH4
TH4
(WH)
63L
31
63L
(RD)
63HS
(WH)
W112
only
TRANS
TH33 TH7 TH6 TH3
2 1
t°
TH34
(RD)
TH34
63HS
CN4
(WH)
1 3
TH8
CNDC
(PK)
1
2
3
CNS
(WH)
31
F2
F1
F3
F4
CNAC
(WH)
1 3
CNDM
(WH)
1 2
2
12
3 4
7
CN2
(RD)
CNL
(BU)
CNDC
(PK)
3 131
3272
1 1 1 1 13 2 2 7 2
CN7
(WH)
CN6
(WH)
CN4
(WH)
CN2
(RD)
CN5
(RD)
BK
RD
RD
RS
L3OUT
X52CB
TB-L3
L3IN
TB-L2
TB-N
TB-L1
X52CA
TB-U
TB-V
TB-W
U W
V
CNCT
(RD)
CNAC2
(RD)
MC
MS
3~
CNAC1
(WH)
1 13 2 3
2
E3E2EI
BK BK BK
LI1
LI2
LI3
NI
GNYE
S1
S2
S3
CONV. B.
1
33
1
2
ACL1
ACL2
ACL3
BK
CK
BK BK
WH WH RD RD
L1-A2 L1-OU L2-A2 L2-OU L3-A2 L3-OU
L1-IN L1-A1
N-IN
CK-OU
BK
RD
LO1
LO2
RD
WH
LO3 BK
NO BU
BK
WH
RD
CN7
(WH)
ACL4
RD
TB1
L2
L1
N
L3
TO
INDOOR
UNIT
WH
BK
BU
POWER
SUPPLY
3N~
400V 50Hz
TB2
BN OG YE
CY1
CY2
1 7
SW1
SW9 SW7
SW6
*1
SW4 SW8 SW5
SW2
LED3
PUHZ-W85YAA.UK PUHZ-W112YAA.UK

10
OCH681
7WIRING SPECIFICATIONS
FIELD ELECTRICAL WIRING (power wiring specifications)
Outdoor unit model W85V W112V
W85Y, W112Y
Outdoor unit power supply ~/N (single), 50 Hz, 230 V ~/N (single), 50 Hz, 230 V
3N~ (3 ph 4-wires), 50 Hz, 400 V
Outdoor unit input capacity Main switch (Breaker) *1 25A 32A 16A
Wiring Wire No. × size (mm2)
Outdoor unit power supply 3 × Min 2.5 3 × Min 4 5 × Min 1.5
Indoor unit-Outdoor unit *2 3 × 1.5 (polar) 3 × 1.5 (polar) 3 × 1.5 (polar)
Indoor unit-Outdoor unit earth *2 1 × Min 1.5 1 × Min 1.5 1 × Min 1.5
Remote controller-Indoor unit *3 2 ×0.3 (Non-polar) 2 ×0.3 (Non-polar) 2 ×0.3 (Non-polar)
Circuit rating
"Outdoor unit L-N (single)
Outdoor unit L1-N, L2-N, L3-N (3 phase)" *4 230 V AC 230 V AC 230 V AC
Indoor unit-Outdoor unit S1-S2 *4 230 V AC 230 V AC 230 V AC
Indoor unit-Outdoor unit S2-S3 *4 24 V DC 24 V DC 24 V DC
Remote controller-Indoor unit *4 12 V DC 12 V DC 12 V DC
*1. A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
Make sure that the current leakage breaker is one compatible with higher harmonics.
Always use a current leakage breaker that is compatible with higher harmonics as this unit is equipped with an inverter.
The use of an inadequate breaker can cause the incorrect operation of inverter.
*2.Maximum 45 m
If 2.5 mm² is used, maximum 50 m.
If 2.5 mm² is used and S3 is separated, maximum 80 m.
*3. The 10 m wire is attached in the remote controller accessory.
*4. The gures are NOT always against the ground.
S3 terminal has 24 V DC against S2 terminal. However between S3 and S1, these terminals are NOT electrically insulated by the transformer or other device.
S1
S2
S3
S1
S2
S3
Warning:
· In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation
between power line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3
terminals when the power is energized. If isolator should be used between indoor unit and outdoor unit, please use 3-pole type.
Notes: 1. Wiring size must comply with the applicable local and national codes.
2.
Power supply cables and the cables between Interface unit/Flow temp. controller and outdoor unit shall not be lighter than polychloroprene
sheathed exible cables. (Design 60245 IEC 57
)
3. Be sure to connect the cables between
Interface unit/Flow temp. controller and outdoor unit directly to the units (no intermediate connections
are allowed).
Intermediate connections may result in communication errors. If water enters at the intermediate connection point, it may cause insufcient
insulation to ground or a poor electrical contact.
(If an intermediate connection is necessary, be sure to take measures to prevent water from entering the cables.)
4. Install an earth line longer than power cables.
5. Do not construct a system with a power supply that is turned ON and OFF frequently.
6. Use self-extinguishing distribution cable for power supply wiring.
7. Properly route wiring so as not to contact the sheet metal edge or screw tip.
Outdoor Unit
3 poles isolator
Power
supply
Isolator
Indoor unit
(Interface unit /
Flow temp.
controller)
Never splice the power cable or the Interface unit/Flow temp. controller-outdoor unit connection cable, otherwise it may result in smoke emission, a re or communi-
cation failure.