Mitsubishi PUHZ-W50VHA2 User manual

SERVICE MANUAL
CONTENTS
TECHNICAL CHANGES...................................... 2
1. SAFETY PRECAUTION................................... 3
2. SPECIFICATIONS............................................ 6
3. DATA ............................................................... 8
4. OUTLINES AND DIMENSIONS....................... 9
5. WIRING DIAGRAM........................................ 10
6. WIRING SPECIFICATIONS ............................11
7. REFRIGERANT SYSTEM DIAGRAM ............... 12
8. TROUBLESHOOTING ................................... 13
9. DISASSEMBLY PROCEDURE...................... 47
Notes:
•This manual describes service
data of outdoor unit only.
•
RoHS compliant products have
<G> mark on the spec name
plate.
R410A
PARTS CATALOG (OCB605)
SPLIT-TYPE, AIR TO WATER HEAT PUMP
No. OCH605
REVISED EDITION-A
November 2015
[Model Name]
PUHZ-W50VHA2
Salt proof model
PUHZ-W50VHA2-BS
[Service Ref.]
PUHZ-W50VHA2
PUHZ-W50VHA2R1
PUHZ-W50VHA2-BS
PUHZ-W50VHA2R1-BS
•PleasevoidOCH605.
Revision:
•AddedPUHZ-W50VHA2R1
andPUHZ-W50VHA2R1-BS
inREVISEDEDITION-A.
•Somedescriptionshavebeen
modified.

2
TECHNICAL CHANGES
Service ref. have been changed as follows.
PUHZ-W50VHA2 PUHZ-W50VHA2R1
PUHZ-W50VHA2-BS PUHZ-W50VHA2R1-BS
1.TheinstallationdirectionofLEV-Bassyhasbeenchangedtoreducehighfrequencynoise.
OCH605A

3
SAFETY PRECAUTION
1
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 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.
Cautions for units utilizing refrigerant R410A
1-2. CAUTIONS RELATED TO NEW REFRIGERANT
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.
Use the specified refrigerant only.
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.
OCH605A

4
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in the 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.
·Chargingshouldbeperformedwiththecylinderofsyphonstoodvertically.(Refrigerantischargedfromliquidphase.)
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
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 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 —
OCH605A

5
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.Ifthecoverpanelmaybecomecoveredwithsalt,besuretoinstalltheunitinalocationwherethesaltwillbewashedawayby
rainwater.(Ifasunshadeisinstalled,rainwatermaynotcleanthepanel.)
3.Toensure thatwaterdoesnotcollectinthebaseoftheoutdoorunit,makesure thatthebaseislevel,notatangle.Water
collectinginthebaseoftheoutdoorunitcouldcauserust.
4.Iftheunitisinstalledinacoastalarea,cleantheunitwithwaterregularlytoremoveanysaltbuild-up.
5.Iftheunitisdamagedduringinstallationormaintenance,besuretorepairit.
6.Besuretochecktheconditionoftheunitregularly.
7.Besuretoinstalltheunitinalocationwithgooddrainage.
1-4. PRECAUTIONS FOR SALT PROOF TYPE "-BS" MODEL
1-3. CAUTIONS FOR REFRIGERANT PIPING WORK
Tools for R410A (The following table shows whether conventional tools can be used or not.)
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Safety charger
Charge valve
Vacuum pump
Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale
Vacuum gauge or thermis-
tor vacuum gauge and
vacuum valve
Charging cylinder
Air purge, refrigerant charge
and operation check
Gas leak check
Refrigerant recovery
Refrigerant charge
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Prevent gas from blowing out
when detaching charge hose
Vacuum drying and air
purge
Bend the pipes
Cut the pipes
Weld the pipes
Charge refrigerant
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refri-
gerant to thermistor vacuum gauge)
Refrigerant charge
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adap-
ter for reverse flow check
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
Tools and materials Use R410A tools Can R22 tools be used?
(Usable if equipped
with adapter for rever-
se flow)
Can R407C tools be used?
(Usable if equipped
with adapter for rever-
se flow)
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
OCH605A

6
SPECIFICATIONS
2
2-1. SPECIFICATIONS
PUHZ-W50VHA2
noitidnocgnitarepolanimoN
)ycneuqerF,egatloV,esahP(ylppusrewoP
Nominal water flow rate (Heating mode) L/min Heating(A7/W35)
Heating 7+)blub-yrD(erutarepmetriaedistuOWkyticapaC °C
(A7/W35) 6+)blub-teW(erutarepmetriaedistuOPOC °C
53+/03+)teltuo/telni(erutarepmetretaWWktupnirewoP °C
Heating WkyticapaC Heating(A2/W35)
(A2/W35) 2+)blub-yrD(erutarepmetriaedistuOPOC °C
1+)blub-teW(erutarepmetriaedistuOWktupnirewoP °C
Pressure difference (water circuit) )teltuo/telni(erutarepmetretaWaPk －/+35°C
Heating pump input (based on EN14511) kW Cooling(A35/W7)
53+)blub-yrD(erutarepmetriaedist
uOnim/L)edomgnilooC(etarwolfretawlanimoN °C
Cooling 42+)blub-teW(erutarepmetriaedistuOWkyticapaC °C
(A35/W7) EER (COP) Water temperature (inlet/outlet) +12/+7°C
Power input kW Cooling(A35/W18)
Cooling 53+)blub-yrD(erutarepmetriaedistuOWkyticapaC °C
(A35/W18) EER (COP) Outside air temperature (Wet-bulb) + 24°C
81+/32+)teltuo/telni(erutarepmetretaWWktupnirewoP °C
Pressure difference (water circuit) kPa
Cooling pump input (based on EN14511) kW
Note: "COP" and "Power input" in the above table are values that contains the "pump input (based on EN 14511) ".
regnahcxetaehetalP
snoitacificepstinuroodtuO
Service ref.
MITSUBISHI
Running current Heating
(A7/W35)
MWA1-28LM
A
Cooling
(A35/W7) A
Power factor Heating
(A7/W35)
39 mm
:A
%
Cooling
(A35/W7)
mm2.862:B
%
Atnerruc.xaM mm39:W
AezisrekaerB mm523:H
gnisacretuO mm2.45:D
hsiniflanretxE setalp28
lortnoctnar
egirfeR
Compressor
Model
Motor output kW
Start type
Protection devices
Maximum outlet water temperature
Oil (Model) L
WretaehesacknarC
Heat exchanger Air
Water
Fan Fan(drive)×No.
Fan motor output
kW
Air flow m
3
/min
(CFM)
Defrost method
Noise level
Cooling dB
Dimensions Width mm (in)
Depth mm (in)
Height mm (in)
)bl(gkthgieW
Refrigerant
*1 Hot gas with 4-way valve
Quantity kg (lb)
*2 at distance of 1 m from outdoor unit
Guaranteed operating Heating °C
*3 grille
range (Outdoor) Cooling
Outlet water temp. Heating
(Max in heating, Min in cooling)
Cooling
Nominal return water Heating
temperature range Cooling
nim/L
egnaretarwolfretaW
50
Plate fin coil
Plate heat exchanger
Inverter
1[, 230 V, 50 Hz
16
2.94
1.01
(Min.1.50) 5.00
4.50
1.53
10
1.11
14.3
64 (141)
950 (37-3/8)
330 +30
*3
(13+1-3/16)
13.0
HP switch
Discharge thermo
48
*2
-
0.9
SNB130FTCM
5.4
Galvanized plate
0.01
Hermetic twin rotary
6.8
PUHZ-W50VHA2(R1)
PUHZ-W50VHA2(R1)-BS
97
97
Linear expansion valve
Munsell 3Y 7.8/1.1
12.9
4.50
4.50
4.44
(Min.1.50) 5.00
0.01
3.50
1.43
12
1.7 (3.7)
+60
+5
*4 With the optional air outlet guide, the operation at
*5 For details of the min. return water temperature at
each water flow rate, refer to “2-2. AVAILABLE RANGE
(WATER FLOW RATE, RETURN WATER TEMP.)”.
−15°C outdoor temperature is possible.
Comp. Surface thermo
Overcurrent detection
46
*2
0.35 (FV50S)
740 (29-3/16)
R410A
(1,760)
Reverse cycle
*1
Propeller fan × 1
0.086
40
45
50
55
60
65
Ambient temperature [°C]
Maximum outlet water temperature [ °C ]
W
H
D
Water OUT
Water IN
Ref. IN
(Heating)
Ref. OUT
(Heating)
Thermistor
(
TH
3
2
)
A
B
°C
°C
°C
°C
°C
Heating dB(SPL)
6.5 to 14.3
−15 to +21
−5
(*4)
*5
to +46
+9 to +59
+8 to +28
PUHZ-W50VHA2-BS
−20 −15 −10 −5 0 5 10
PUHZ-W50VHA2R1 PUHZ-W50VHA2R1-BS
OCH605A

7
2-2. AVAILABLE RANGE (WATER FLOW RATE, RETURN WATER TEMP.)
Note: If using the unit out of the available range, the parts of unit might be damaged.
<Heating>
Table 1
5.0
6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0
7.0
9.0
11.0
13.0
15.0
17.0
19.0
Water flow rate [L/min]
Return water temp [:]
<Applicable Models>
• PUHZ-W50VHA2
• PUHZ-W50VHA2R1
• PUHZ-W50VHA2-BS
• PUHZ-W50VHA2R1-BS
Available range
<Cooling>
Table 4
7.06.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0
Water flow rate [L/min]
5.0
7.0
9.0
11.0
13.0
15.0
17.0
19.0
Return water temp [:]
<Applicable Models>
• PUHZ-W50VHA2
• PUHZ-W50VHA2R1
• PUHZ-W50VHA2-BS
• PUHZ-W50VHA2R1-BS
Available range
OCH605A

8
DATA
3
3-1. NOISE CRITERION CURVES
PUHZ-W50VHA2 PUHZ-W50VHA2R1
PUHZ-W50VHA2-BS PUHZ-W50VHA2R1-BS
1.5 m
1 m
MICROPHONE
UNIT
GROUND
3-2. STANDARD OPERATION DATA
Mode Cooling(A35/W7) Heating(A7/W35)
Total
Capacity W4,500 5,000
Input kW 1.53 1.11
Electrical circuit
Outdoor unit PUHZ-W50VHA2
Phase,Hz 1,50
Voltage V 230
Current A6.8 5.4
Refrigerantcircuit
Dischargepressure MPa 2.51 2.13
Suction pressure MPa 0.83 0.68
Dischargetemperature ºC 69 68
Condensingtemperature ºC 43 37
Suction temperature ºC 6 6
Water
conditions
Flowvolume L/min 12.9 14.3
Outletwatertemperature ºC 7 35
Outdoor
conditions
Intake air
temperature
D.B. ºC 35 7
W.B. ºC 24 6
TheunitofpressurehasbeenchangedtoMPabasedoninternationalSIsystem.
Theconversionfactoris:1(MPa)=10.2(kgf/cm2)
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 bar)
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)
46
LINE
OCH605A

9
PUHZ-W50VHA2 PUHZ-W50VHA2R1
PUHZ-W50VHA2-BS PUHZ-W50VHA2R1-BS
Earth terminal
Handle for moving
Terminal Connections Left•••• Power supply wiring Right•• Controller wiring
Handle for moving
Service panel
23
371
740
322
950
473
Water IN
Air Intake
Water OUT
Handle for moving
Rear Air Intake
Handle for moving
50
see Detail
Power supply wiring hole (2-
[
27Knock Out)
Front cover
40
119
34
Side Air Intake
Handle for moving
Rear Air Intake
Side Air Intake
Air Discharge
2-12 x 36 oval holes (Foundation Bolt M10)
2-U Shaped notched holes (Foundation Bolt M10)
Installation Feet
53
417
37028
175 175600
19
33030
Drain hole (5-[33)
30
81 219
220 145145145
Detail
ISO 228/1-G1 B
85 269
24
<Foundation bolt height>
Please secure the unit firmly with 4 foundation (M10) bolts. (Bolts and washers must be purchased locally.)
Service space
Dimensions of space needed for service access are shown in the below diagram.
FREE
Over 300mm
Over 10mm
The diagram below shows a basic example. Explanation of particular details are given in the installation manuals etc.
Over 500mm
Over 10mm
1 FREE SPACE (Around the unit) 2 SERVICE SPACE 3 FOUNDATION BOLTS
Less than
Over
Over
Over300
500
500
Over10
30
FOUNDATION
OUTLINES AND DIMENSIONS
4
Unit: mm
OCH605A

10
5WIRING DIAGRAM
PUHZ-W50VHA2 PUHZ-W50VHA2R1
PUHZ-W50VHA2-BS PUHZ-W50VHA2R1-BS
TB1
MC
MF1
21S4
63H
TH3
TH4
TH6
TH7
TH8
LEV-A, LEV-B
ACL
Terminal Block
<Power Supply, Indoor/Outdoor>
Motor for Compressor
Fan Motor
Solenoid Valve(4-Way Valve)
High Pressure Switch
63HS High Pressure Sensor
Thermistor<Liquid>
Thermistor<Discharge>
Thermistor<Plate HEX Liquid>
Thermistor<Ambient>
Thermistor<Heat Sink>
TH34 Thermistor<Comp. Surface>
TH32 Thermistor<Inlet Water>
Linear Expansion Valve
Reactor
CY1, CY2 Capacitor
Power Circuit Board
P. B.
Controller Circuit Board
Switch <Manual Defrost, Defect History
Record Reset, Function Switch>
Switch<Function Switch, Model Select>
Switch<Function Switch>
SW1
Connector<Connection for Option>
Connector<Connection for Option>
CNDM
SW6
SW8
Switch<Function Switch>
SW7
SV1/CH
Connector<Connection for Option>
SV3/SS
C. B.
SYMBOL NAME SYMBOL NAME
Switch<Model Select>
Switch<Function Switch>
SW5
Switch<Function Switch>
SW2
Switch<Function Switch>
SW4
SW9
Fuse<T10AL250V>
F1, F2
Fuse<T6.3AL250V>
F3, F4
TBL4 TBL2
S/N1 R/L1
CNAC2
(RD)
3
E3
1
CNAC1
(WH)
3
1
BK
E4
BK
EI
BK
1
CNDC
(PK)
3
MS
3~
MF1
1
3
1
7
34 11 1 2 2
1 7
1
CNF1
(WH)
TRANS
CNDC
(PK)
TH7/6
(RD)
TH3
(WH)
TH4
(WH)
TH7 TH6 TH3 TH4
1 2
TH32
(BK)
TH32
2 1
TH34
(RD)
TH34
63HS
63HS
(WH)
31
CNS
(WH)
63H
(YE)
3
1
63H
C. B.
P. B.
LED3
2
7
CN2
(RD)
F3
1 2
1 3
CNAC
(WH)
CN4
(WH)
12
34
F4
F2
F1
21S4
(GN)
SV3/SS
(WH)
1 31 3
X52
SV1/CH
(GY)
X54 X51
21S4
IC710
MS
3~
MC
CN2
(RD)
1
7
7
TH8
LEV-A
(WH)
LEV-A
CNDM
(WH)
13
ACL
Q600
DB2
M
51
LEV-B
(RD)
LEV-B
M
51
2
12
CN4
(WH)
12
CN6
(WH)
U
V
W
RD
WH
BK
LN
RD
WH
BN
OG
YE
GNYE
TB1
CY1
CY2
S1 S2 S3
POWER SUPPLY
~/N 230V 50Hz
TO INDOOR UNIT
*
1
*
1
SW6
SW1
SW8
SW2 SW7
SW5
SW4
SW9
Vo
Wo
Uo DB1
DB3
1 2 3 4 5 6 7 8
MODEL SW6
*1 MODEL SELECT
SW5-6 *2
OFF
ON
50V
OFF
ON
1 2 3 4 5 6
*2 SW5 -1 to 5 : Function Switch
The black square ( ) indicates a switch position.
OCH605A