Mitsubishi PUHZ-W112VHAR1 User manual

SERVICE MANUAL
No. OCH562
REVISED EDITION-D
CONTENTS
TECHNICAL CHANGES...................................... 2
1. SAFETY PRECAUTION................................... 3
2. SPECIFICATIONS............................................ 6
3. DATA ............................................................... 9
4. OUTLINES AND DIMENSIONS......................11
5. WIRING DIAGRAM........................................ 12
6. WIRING SPECIFICATIONS ........................... 14
7. REFRIGERANT SYSTEM DIAGRAM ............... 15
8. TROUBLESHOOTING ................................... 16
9. DISASSEMBLY PROCEDURE...................... 52
April 2019
Note:
•This manual describes service
data of outdoor unit only.
R410A
PARTS CATALOG (OCB562)
Outdoor unit
AIR TO WATER HEAT PUMP
• OCH562 REVISED EDITION-C
is void.
Revision:
• Added PUHZ-W112VHAR3
and PUHZ-W112VHAR3-BS
in REVISED EDITION-D.
• Some descriptions have been
modified.
[Model Name] [Service Ref.]
PUHZ-W112VHA PUHZ-W112VHA
PUHZ-W112VHAR1
PUHZ-W112VHAR2
PUHZ-W112VHAR3
Salt proof model
PUHZ-W112VHA-BS PUHZ-W112VHA-BS
PUHZ-W112VHAR1-BS
PUHZ-W112VHAR2-BS
PUHZ-W112VHAR3-BS

2
OCH562D
TECHNICAL CHANGES
Service ref. have been changed as follows.
PUHZ-W112VHAR2 PUHZ-W112VHAR3
PUHZ-W112VHAR2-BS PUHZ-W112VHAR3-BS
1. Plate heat exchanger has been changed.
PUHZ-W112VHAR1 PUHZ-W112VHAR2
PUHZ-W112VHAR1-BS PUHZ-W112VHAR2-BS
1. Compressor oil has been added.
2. The installation direction of LEV-B assy has been changed to reduce high frequency noise.
3. Outdoor controller board has been changed.
PUHZ-W112VHA PUHZ-W112VHAR1
PUHZ-W112VHA-BS PUHZ-W112VHAR1-BS
1. A compliance with ErP directive Lot 1 has been authorized.
2. Outdoor controller board has been changed.
3. Outdoor power circuit board has been changed.

3
OCH562D
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.

4
OCH562D
[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.)
Electronic weighing scale
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 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
OCH562D
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.)
Tools and materials Use R410A tools
Can R22 tools be
used?
Can R407C tools be used?
Gauge manifold Air purge, refrigerant charge
and operation check
Tool exclusive for R410A × ×
Charge hose Tool exclusive for R410A × ×
Gas leak detector Gas leak check Tool for HFC refrigerant ×○
Refrigerant recovery equipment Refrigerant recovery Tool exclusive for R410A × ×
Refrigerant cylinder Refrigerant charge Tool exclusive for R410A × ×
Safety charger
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Tool exclusive for R410A × ×
Charge valve Prevent gas from blowing out
when detaching charge hose Tool exclusive for R410A × ×
Vacuum pump Vacuum drying and air purge
Tools for other refrigerants
can be used if equipped with
adapter for reverse ow check
Δ(Usable if equipped
with adapter for
reverse flow)
Δ(Usable if equipped with
adapter for reverse flow)
Bender Bend the pipes
Tools for other refrigerants can be used
○ ○
Pipe cutter Cut the pipes Tools for other refrigerants can be used
○ ○
Welder and nitrogen gas
cylinder Weld the pipes
Tools for other refrigerants can be used
○ ○
Refrigerant charging scale Refrigerant charge Tools for other refrigerants can be used
○ ○
Vacuum gauge or thermistor
vacuum gauge and vacuum
valve
Check the degree of vacuum. (Vacuum
valve prevents back ow of oil and re-
frigerant to thermistor vacuum gauge)
Tools for other refrigerants can be used
○ ○
Charging cylinder Refrigerant charge Tool exclusive for R410A × -
×: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
Δ: Tools for other refrigerants can be used under certain conditions.
○: Tools for other refrigerants can be used.

6
OCH562D
PUHZ-W112VHA
noitidnocgnitarepolanimoN)ycneuqerF,egatloV,esahP(ylppusrewoP
Nominal water flow rate (Heating mode) L/min Heating(A7/W35)
Heating 7+)blub-yrD(erutarepmetriaedistuOWkyticapaC ℃
(A7/W35)6+)blub-teW(erutarepmetriaedistuOPOC ℃
53+/03+)teltuo/telni(erutarepmetretaWWktupnirewoP ℃
Heating WkyticapaC Heating(A2/W35)
(A2/W35)2+)blub-yrD(erutarepmetriaedistuOPOC ℃
1+)blub-teW(erutarepmetriaedistuOWktupnirewoP ℃
Pressure difference (water circuit) )teltuo/telni(erutarepmetretaWaPk －/+35℃
Heating pump input (based on EN14511) kW Cooling(A35/W7)
53+)blub-yrD(erutarepmetriaedistuOnim/L)edomgnilooC(etarwolfretawlanimoN ℃
Cooling 42+)blub-teW(erutarepmetriaedistuOWkyticapaC ℃
(A35/W7) 7+/21+)teltuo/telni(erutarepmetretaW)POC(REE ℃
Power input kW Cooling(A35/W18)
Cooling 53+)blub-yrD(erutarepmetriaedistuOWkyticapaC ℃
(A35/W18)42+)blub-teW(erutarepmetri
aedistuO)POC(REE ℃
81+/32+)teltuo/telni(erutarepmetretaWWktupnirewoP ℃
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
Model name
MITSUBISHI
Running currentHeating
(A7/W35) A
Cooling
(A35/W7) A
Powerfactor Heating
(A7/W35) %
Cooling
(A35/W7) mm05:A%
mm664:BAtnerruc.xaM
Breaker size
A
MWA2-46LM
29.5
0.01
11.20
0.01
3.34
3.35
6.3
15.8
98
98
11.1
1ø , 230 V, 50 Hz
32
2.80
2.22
11.20
4.47
3.57
5
2.51
32.1
28.7
10.00
10.00
4.50
PUHZ-W112VHA(R1/R2)
PUHZ-W112VHA(R1/R2)-BS
W
Water OUT
Ref. IN
(Heating)
B
mm801:WgnisacretuO
mm225:HhsiniflanretxE
mm231:DlortnoctnaregirfeR
setalp64rosserpmoC
Model
Motor output kW
Start type
erutarepmetretawteltuomumixaMsecivednoitcetorP
Oil (Model) L
WretaehesacknarC
Heat exchanger Air
Water
.oN×)evird(naFnaF
Fan motor output
kW
Airflow m
3
/min
(CFM)
Defrost method
Noise level(SPL) Heating dB
Cooling dB
Dimensions Width mm (in)
Depth mm (in)
Heightmm (in)
)bl(gkthgieW
Refrigerant
Quantity kg (lb)
Guaranteed operating Heating ℃
range (Outdoor) Cooling ℃
Outlet water temp. Heating ℃
(Max in heating, Min in cooling)
Cooling ℃
Return water Heating ℃
R410A
(3,530)
Reverse cycle
*2
Propeller fan × 2
0.074 x 2
133 (294)
1020 (40-3/16)
330 +30
(*5)
(13+1-3/16)
53
*3
1350 (53-1/8)
Galvanized plate
53
*3 *4
-
2.5
4.0 (8.8)
−20
(*6)
to +21
−5
(*7)
to +46
+5
(*8)
to +59
+60
+5
ANB33FNMMT
100
Plate fin coil
Plate heat exchanger
Comp. surface thermo
0.9 (FV50S)
Inverter
HP switch/LP switch
Discharge thermo
Hermetic scroll
Linear expansion valve
Munsell 3Y 7.8/1.1
H
D
Water IN
Ref. OUT
(Heating)
Thermistor
(
TH
3
2
)
A
*2 Hot gas with 4-way valve
*3 at distance of 1m from outdoor unit
*4 A weighted sound power level in accordance
with ISO9614-1 for EN14511 testing is 69dBA.
*5 grill
*6 Lower limit of use is −5℃for EN14511 testing
purposes.
*7 With the optional air outlet guide, min operation
temperature will be −15 ℃.
*8 Lowest entering temperature is 12 ℃for EN14511
temperature rangeCooling ℃
1.234 to.41nim/LegnaretarwolfretaW
+8 to +28
testing purposes.
40
45
50
55
60
65
−20 −15 10 5 0 5 10
Maximum outlet water temperature [℃]
− −
PUHZ-W112VHA-BS
PUHZ-W112VHAR1
PUHZ-W112VHAR1-BS
Overcurrent detection
PUHZ-W112VHAR2
PUHZ-W112VHAR2-BS
*1
*1 The amount of oil
for PUHZ-W112VHAR2/R3(-BS) is 1.4L.
SPECIFICATIONS
2
2-1. SPECIFICATIONS

7
OCH562D
noitidnocgnitarepolanimoN)ycneuqerF,egatloV,esahP(ylppusrewoP
Nominal water flow rate (Heating mode) L/min Heating(A7/W35)
Heating 7+)blub-yrD(erutarepmetriaedistuOWkyticapaC ℃
(A7/W35)6+)blub-teW(erutarepmetriaedistuOPOC ℃
53+/03+)teltuo/telni(erutarepmetretaWWktupnirewoP ℃
Heating WkyticapaC Heating(A2/W35)
(A2/W35)2+)blub-yrD(erutarepmetriaedistuOPOC ℃
1+)blub-teW(erutarepmetriaedistuOWktupnirewoP ℃
Pressure difference (water circuit) )teltuo/telni(erutarepmetretaWaPk －/+35℃
Heating pump input (based on EN14511) kW Cooling(A35/W7)
53+)blub-yrD(erutarepmetriaedistuOnim/L)edomgnilooC(etarwolfretawlanimoN ℃
Cooling 42+)blub-teW(erutarepmetriaedistuOWkyticapaC ℃
(A35/W7) 7+/21+)teltuo/telni(erutarepmetretaW)POC(REE ℃
Power input kW Cooling(A35/W18)
Cooling 53+)blub-yrD(erutarepmetriaedistuOWkyticapaC ℃
(A35/W18)42+)blub-teW(erutarepmetriaed
istuO)POC(REE ℃
81+/32+)teltuo/telni(erutarepmetretaWWktupnirewoP ℃
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
Model name
Running currentHeating
(A7/W35) A
Cooling
(A35/W7) A
Powerfactor Heating
(A7/W35) %
Cooling
(A35/W7) %
Atnerruc.xaM
Breaker size
A
29.5
0.01
11.20
0.01
3.34
3.35
6
15.8
98
98
11.1
1ø , 230 V, 50 Hz
32
2.80
2.22
11.20
4.47
3.57
5
2.51
32.1
28.7
10.00
10.00
4.50
PUHZ-W112VHAR3
PUHZ-W112VHAR3-BS
gnisacretuO
hsiniflanretxE
lortnoctnaregirfeR
rosserpmoC
Model
Motor output kW
Start type
erutarepmetretawteltuomumixaMsecivednoitcetorP
Oil (Model) L
WretaehesacknarC
Heat exchanger Air
Water
.oN×)evird(naFnaF
Fan motor output
kW
Airflow m
3
/min
(CFM)
Defrost method
Noise level(SPL) Heating dB
Cooling dB
Dimensions Width mm (in)
Depth mm (in)
Heightmm (in)
)bl(gkthgieW
Refrigerant
Quantity kg (lb)
Guaranteed operating Heating ℃
range (Outdoor) Cooling ℃
Outlet water temp. Heating ℃
(Max in heating, Min in cooling)
Cooling ℃
Return water Heating ℃
R410A
(3,530)
Reverse cycle
*2
Propeller fan × 2
0.074 x 2
133 (294)
1020 (40-3/16)
330 +30
(*5)
(13+1-3/16)
53
*3
1350 (53-1/8)
Galvanized plate
53
*3 *4
-
2.5
4.0 (8.8)
−20
(*6)
to +21
−5
(*7)
to +46
+5
(*8)
to +59
+60
+5
ANB33FNMMT
100
Plate fin coil
Plate heat exchanger
Comp. surface thermo
0.9 (FV50S)
Inverter
HP switch/LP switch
Discharge thermo
Hermetic scroll
Linear expansion valve
Munsell 3Y 7.8/1.1
*2 Hot gas with 4-way valve
*3 at distance of 1m from outdoor unit
*4 A weighted sound power level in accordance
with ISO9614-1 for EN14511 testing is 69dBA.
*5 grill
*6 Lower limit of use is −5℃for EN14511 testing
purposes.
*7 With the optional air outlet guide, min operation
temperature will be −15 ℃.
*8 Lowest entering temperature is 12 ℃for EN14511
temperature rangeCooling ℃
1.234 to.41nim/LegnaretarwolfretaW
+8 to +28
testing purposes.
40
45
50
55
60
65
−20 −15 10 5 0 5 10
Maximum outlet water temperature [℃]
− −
Overcurrent detection
PUHZ-W112VHAR3 PUHZ-W112VHAR3-BS
*1
*1 The amount of oil
for PUHZ-W112VHAR2/R3(-BS) is 1.4L.
ALFA LAVAL
ACH-70X-52H
mm05:A
mm664:B
mm111:W
mm625:H
mm0.631:D
setalp25
W
H
D
Water OUT
Water IN
Ref. IN
(Heating)
Ref. OUT
(Heating)
Thermistor
(
TH
3
2
)
A
B

8
OCH562D
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>
14.0 19.0 24.0 29.0 34.0 39.0
Table 3
Water flow rate [L/min]
5.0
7.0
9.0
11.0
13.0
15.0
17.0
19.0
21.0
23.0
25.0
Return water temp [:]
<Applicable Model>
• PUHZ-W112VHA
• PUHZ-W112VHA-BS
• PUHZ-W112VHAR1
• PUHZ-W112VHAR1-BS
• PUHZ-W112VHAR2
• PUHZ-W112VHAR2-BS
• PUHZ-W112VHAR3
• PUHZ-W112VHAR3-BS
Available range
<Cooling>
14.0 19.0 24.0 29.0 34.0 39.0
Table 6
Water flow rate [L/min]
5.0
7.0
9.0
11.0
13.0
15.0
Return water temp [:]
<Applicable Model>
• PUHZ-W112VHA
• PUHZ-W112VHA-BS
• PUHZ-W112VHAR1
• PUHZ-W112VHAR1-BS
• PUHZ-W112VHAR2
• PUHZ-W112VHAR2-BS
• PUHZ-W112VHAR3
• PUHZ-W112VHAR3-BS
17.0
Available range

9
OCH562D
DATA
3
1.5m
1m
MICROPHONE
UNIT
GROUND
3-1. 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 bar)
63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
BAND CENTER FREQUENCIES, Hz
COOLING
MODE
HEATING
53
SPL(dB)
53
LINE
PUHZ-W112VHA
PUHZ-W112VHA-BS
PUHZ-W112VHAR1
PUHZ-W112VHAR1-BS
PUHZ-W112VHAR2
PUHZ-W112VHAR2-BS
PUHZ-W112VHAR3
PUHZ-W112VHAR3-BS

10
OCH562D
3-2. STANDARD OPERATION DATA
Mode Cooling (A35/W7) Heating (A7/W35)
Total
Capacity W 10,000 11,200
Input kW 3.57 2.51
Electrical circuit
Outdoor unit PUHZ-W112VHA
Phase, Hz 1, 50
Voltage V 230
Current A 15.8 11.1
Refrigerant circuit
Discharge pressure MPa 2.63 2.08
Suction pressure MPa 0.83 0.67
Discharge temperature ºC 69 60
Condensing temperature ºC 45 36
Suction temperature ºC 9 6
Water
conditions
Flow volume L/min 28.7 32.1
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)

11
OCH562D
PUHZ-W112VHA PUHZ-W112VHAR2
PUHZ-W112VHA-BS PUHZ-W112VHAR2-BS
PUHZ-W112VHAR1 PUHZ-W112VHAR3
PUHZ-W112VHAR1-BS PUHZ-W112VHAR3-BS
Rear Air Intake
2-12×36 oval holes
(Foundation Bolt M10)
2-U Shaped notched holes
(Foundation Bolt M10)
Installation Feet
Side Air Intake
Air Discharge
30 330
210 600 210
28
53
370 19
417
Handle for moving
Service panel
Terminal connections
Left···Power supply wiring Right···Controller wiring
Earth terminal
Handle for moving Handle for moving
1020
322
1350
1079
371
23
635
Power supply
wiring hole
(2-{27Knock Out)
Front cover
see Detail
Air Intake
4074
34
Handle for moving
Rear Air Intake
Handle for moving
Water OUT
Water IN
59
Handle for moving
Side Air Intake
Detail
Scale 1:6
ISO 228-1
G1 B
46674
24
Drain hole (5-{33)
21981
30 256 133 133 133
FOUNDATION
<Foundation bolt height>
Please secure the unit firmly with 4 foundation (M10) bolts. (Bolts and washers must be purchased locally.)
30
Service space
Dimensions of space needed for service access are shown in the below diagram.
500
500
FREE
Over 300mm
Over 10mm
The diagram below shows a basic example. Explanation of particular details are given in the installation manuals etc.
Over 10mm
1 FREE SPACE (Around the unit)
2 SERVICE SPACE
3 FOUNDATION BOLTS
Less than
Over
Over
Over 500mm
Unit: mm
OUTLINES AND DIMENSIONS
4

12
OCH562D
PUHZ-W112VHA
PUHZ-W112VHA-BS
1 2 3 4 5 6 7 8
OFF
ON
112V
MODEL SW6
*1 MODEL SELECT
*2. SW5 -1 to 5 : Function Switch
SW5-6 *2
OFF
ON
1 2 3 4 5 6
The black square ( )indicates a switch position.
TB1
MC
MF1, MF2
21S4
63H
TH3
TH4
TH7
LEV-A, LEV-B
DCL
Terminal Block <Power Supply, Indoor/Outdoor>
Motor for Compressor
Fan Motor
Solenoid Valve (Four-Way Valve)
High Pressure Switch
63L Low Pressure Switch
63HS High Pressure Sensor
Thermistor < Liquid >
Thermistor < Discharge >
TH6 Thermistor < Plate HEX Liquid >
Thermistor < Ambient >
TH33 Thermistor < Suction >
TH32 Thermistor < Inlet Water >
Linear Expansion Valve
Reactor
CB Main Smoothing Capacitor
CY1, CY2 Capacitor
Power Module
Controller Circuit Board
Connector
< Emergency Operation >
Connector < Connection for Option >
Switch < Manual Defrost, Defect History,
Record Reset, Function Switch
>
Switch < Function Switch >
Switch < Function Switch, Model Select >
SW1
Connector < Connection for Option >
Connector < Connection for Option >
SS
Connector < Connection for Option >
CN51
CNDM
SW2
SW6
Switch < Function Switch >
SW8
Switch < Function Switch >
SW7
SV1
LED3
LED < Operation/Inspection Indicators >
C. B.
NI
SYMBOL NAME SYMBOL NAME
Connection Terminal < N-Phase >
Connection Terminal < Reactor >
Connection Terminal < Ground >
DCL1, DCL2
IGBT
EI, E2, E3, E4
Power Circuit Board
Connection Terminal
< U/V/W-Phase >
P. B.
LI Connection Terminal
< L-Phase >
U, V, W
Switch < Model Select >
SW5
CN31
Relay
Fuse
< T6.3AL250V >
F1, F2, F3, F4
X51, X52, X54
TH8 Thermistor(internal) < Heat Sink >
Thermistor < Comp. Surface > TH34
Switch
< Function Switch >
SW9
MS
3
~
MF1
1
3
1
73
41
1 1 2 1
1 7
2
CNF1
(WHT)
TRANS
MS
3
~
MF2
17
CNF2
(WHT)
CNDC
(PNK)
TH7/6
( RED )
TH3
(WHT)
TH4
(WHT)
TH7
t° t° t° t°
TH6 TH3 TH4
1 2
TH32
( BLK )
t°
TH32
1 3
TH33
( YLW )
t°
TH33 63HS
63HS
(WHT)
31
CNS
(WHT)
63H
( YLW )
CN52C
(RED)
3
1
3
1
63H
63L
( RED )
3
1
63L
C. B.
IGBT
LED3
223
7
CN2
(WHT)
F3
1 2
1 31 3
CNAC
(WHT)
CN4
(WHT)
12
34
F4
F2
F1 21S4
(GRN)
X52 X54
1 3 SS
(WHT)
SV1
( GRY )
X51
21S4
1
5
CN51
(WHT)
1
3
CNDM
(WHT)
DCL2
N2
P2
MS
3~
U
U
V
V
W
W
CN2
(WHT)
CN4
(WHT)
17
12
2
CNDC
( PNK )
BLK
BLK
WHT
WHT
CY1
CY2
LINI
EI
E4
E2
E3
POWER SUPPLY
~/N 230V 50Hz
Interface unit /
Flow temp. controller
TB1
L N S1 S2 S3
MC
3
1
3
1
2
RED
CNAC1
(WHT)
CNAC2
(RED)
13
1
3
CN52C
(RED)
52C
52C
BLU
YLW
GRN/YLW
ORN BRN
RED
WHT
WHT
RED
RED
BLK BLK
BLK
BLK
DCL1
DCL
CB
t°
TH8
P. B.
SW9SW2
M M
51 1
LEV-A
(WHT)
LEV-B
(RED)
LEV-BLEV-A
5
TH34
(RED)
t°
TH34
12 1 3 15
CNVMNT
(WHT)
CNMNT
(WHT)
*1
SW5SW8
SW7
SW6SW1
CN31
*1
5WIRING DIAGRAM

13
OCH562D
PUHZ-W112VHAR1 PUHZ-W112VHAR2 PUHZ-W112VHAR3
PUHZ-W112VHAR1-BS PUHZ-W112VHAR2-BS PUHZ-W112VHAR3-BS
TB1
MC
MF1, MF2
21S4
63H
TH3
TH4
TH7
LEV-A, LEV-B
DCL
Terminal Block<Power Supply, Indoor/Outdoor>
Motor for Compressor
Fan Motor
Solenoid Valve(4-Way Valve)
High Pressure Switch
63L Low Pressure Switch
63HS High Pressure Sensor
Thermistor<Liquid>
Thermistor<Discharge>
TH6 Thermistor<Plate HEX Liquid>
Thermistor<Ambient>
TH33 Thermistor<Suction>
TH32 Thermistor
<Inlet Water >
Linear Expansion Valve
Reactor
CY1, CY2 Capacitor
Controller Circuit Board
Connector <Connection
for Option>
Switch<Manual Defrost, Defect History
Record Reset, Function Switch>
Switch<Function Switch>
Switch<Function Switch, Model Select>
SW1
Connector<Connection for Option>
Connector<Connection for Option>
SV1/CH
CNDM
SW2
Switch<Function Switch>
SW4
SW6
Switch<Function Switch>
SW8
Switch<Function Switch>
SW7
SV3/SS
C. B.
SYMBOL NAME SYMBOL NAME
Power Circuit Board
P. B.
Switch<Model Select>
SW5
Fuse<T10AL250V>
F1, F2
Fuse<T6.3AL250V>
F3, F4
TH8 Thermistor internal<Heat Sink>
Thermistor<Comp. Surface>TH34
Switch<Function Switch>
SW9
1 2 3 4 5 6 7 8
OFF
ON
112V
MODEL SW6
*1 MODEL SELECT
*2 SW5 -1 to 5 : Function Switch
SW5-6 *2
OFF
ON
1 2 3 4 5 6
The black square( )indicates a switch position.
1
3
3
41
1 1 2 1
1 7
2
TRANS
MS
3~
MF2
17
CNF2
(WH)
MS
3~
MF1
17
CNF1
(WH)
CNDC
(PK)
TH7/6
(RD)
TH3
(WH)
TH4
(WH)
TH7 TH6 TH3 TH4
1 2
TH32
(BK)
TH32
1 3
TH33
(YE)
TH33
63HS
63HS
(WH )
31
CNS
(WH)
63H
(YE)
CN52C
(RD)
3
1
3
1
63H
63L
(RD)
3
1
63L
C. B.
IGBT
LED3
22
3
7
CN2
(RD)
F3
1 2
1 31 3
CNAC
(WH)
CN4
(WH)
12
34
F4
F2
F1 21S4
(GN)
X54 X51
1 3
SV3/SS
(WH)
SV1/CH
(GY)
X52
21S4
13
CNDM
(WH)
DCL2
MS
3
~
U
U
V
V
W
W
CN2
(RD)
CN4
(WH)
17
12
2
73
CNDC
(PK)
BK
WH
CY1
CY2
LINI
EI
E4
E2
E3
POWER SUPPLY
~/N 230V 50Hz
TO
INDOOR UNIT
TB1
L N S1 S2 S3
MC
3
1
3
1
2
RD
CNAC1
(WH)
CNAC2
(RD)
13
1
3
CN52C
(RD)
BU
YE
GNYE
OG
BN
RD
BK BK
BK
BK
DCL1
DCL
TH8
P. B.
SW9SW2
M M
51 1
LEV-A
(WH)
LEV-B
(RD)
LEV-BLEV-A
5
TH34
(RD )
TH34
12
*1
SW5SW8SW4
SW7
SW6SW1
*1

14
OCH562D
WIRING SPECIFICATIONS6
FIELD ELECTRICAL WIRING (power wiring specifications)
Caution: Be sure to install N-line. Without N-line, it could cause damage to the unit.
Notes: 1. Wiring size must comply with the applicable local and national codes.
2. Power supply cables and the cables between 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 Controller and Outdoor unit directly to the units (no intermediate connections are al-
lowed).
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.
ledomtinuroodtuO 112V
Outdoor unit power supply
~/N (single), 50 Hz, 230 V
32A
*1
*2
*2
*3
yticapacrekaerBtiucriCtinuroodtuO
Wiring
Wire No. ×
size (mm²)
6niM×3htrae,ylppusrewoptinuroodtuO
Interface unit/Flow temp. controller-Outdoor unit
Interface unit/Flow temp. controller-Outdoor unit earth 1 × Min 1.5
Remote controller-Interface unit/Flow temp. controller 2 × 0.3 (Non-polar)
Circuit rating
Outdoor unit L-N (single)
Outdoor unit L1-N, L2-N, L3-N (3phase) 230 V AC
*3 230 V AC
*3 24 V DC
*3 12 V DC
Interface unit/Flow temp. controller-Outdoor unit S1-S2
Interface unit/Flow temp. controller-Outdoor unit S2-S3
Remote controller-Interface unit/Flow temp. controller
*1 A breaker with at least 3.0 mm contact separation in each pole shall be provided. Use earth leakage breaker (NV).
*2 Maximum 80 m
*3 The figures 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.
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.
3 × 1.5 (polar)
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 Interface unit/
Flow temp. controller and outdoor unit, please use 3-pole type.
S1
S2
S3
S1
S2
S3
A-Control
Outdoor Unit
3 poles isolator
Power supply
Isolator
Interface unit/
Flow temp. controller
Never splice the power cable or the Interface unit/Flow temp. controllrer - outdoor unit connection cable, otherwise it may result in smoke emis-
sion, a re or communication failure.

15
OCH562D
REFRIGERANT SYSTEM DIAGRAM7
Distributor
TH7
Strainer(#100)
Strainer(#100)
Receiver
Power
LEV-B
TH6
TH32
Plate HEX
Water IN
Water OUT
Strainer
(#100)
TH3
STOP VALVE
CHECK/V CHECK/V
H/P SW
L/P SW
TH4
TH33 TH34
TH8 P/B
LEV-A
COMP
REV/V
P-Sensor
Strainer
(#100)
Strainer
(#100)
Refrigerant flow in cooling
Refrigerant flow in heating
COMP
H/P SW
L/P SW
Plate HEX
REV/V
STOP VALVE
CHECK/V
P-Sensor
P/B
LEV-A
LEV-B
TH33
TH32
TH3
TH4
TH6
TH7
TH8
TH34
Power Receiver
DC inverter scroll compressor (Mitsubishi Electric Corporation)
For protection (OFF: 4.15MPa)
For protection (OFF: −0.03MPa)
MWA2-46LM (MITSUBISHI)*1/ACH-70X-52H(ALFA LAVAL)*2
Change the refrigerant circuit (Heating/Cooling) and for Defrosting
For refrigerant charge
High pressure/Low pressure/For production test use
For calculation of the condensing temperature from high pressure
Inverter power board
Heating: Secondary LEV Cooling: Primary LEV
Heating: Primary LEV Cooling: Secondary LEV
For LEV control
For freeze protection and for compressor frequency control
Heating: Evaporating temperature Cooling: Sub cool liquid temperature
For LEV control and for compressor protection
Heating: Sub cool liquid temperature Cooling: Evaporating temperature
For fan control and for compressor frequency control
For power board protection
For compressor protection
For accumulation of refrigerant
Compressor
High pressure switch (63H)
Low pressure switch (63L)
Plate Heat Exchanger
Reversing (4-way) valve (21S4)
Stop valve
Check valve
Pressure sensor (63HS)
Power board
Linear expansion valve-A
Linear expansion valve-B
Suction temperature thermistor
Inlet water temperature thermistor
Liquid temperature thermistor
Discharge temperature thermistor
Plate HEX liquid temperature thermistor
Ambient temperature thermistor
Heat sink temperature thermistor
Comp. surface temperature thermistor
Power Receiver
Symbol Part name Detail
PUHZ-W112VHA PUHZ-W112VHAR2
PUHZ-W112VHA-BS PUHZ-W112VHAR2-BS
PUHZ-W112VHAR1 PUHZ-W112VHAR3
PUHZ-W112VHAR1-BS PUHZ-W112VHAR3-BS
*1: PUHZ-W112VHA(-BS), PUHZ-W112VHAR1(-BS), PUHZ-W112VHAR2(-BS)
*2: PUHZ-W112VHAR3(-BS)

16
OCH562D
TROUBLESHOOTING8
<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 wired remote controller and control board of out-
door unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa-
rized in the table below. Check the contents below before investigating details.
8-1. TROUBLESHOOTING
8-2. CHECK POINT UNDER TEST RUN
Before test run
• After installation of outdoor units, piping work and electric wiring work, re-check that there is no water leakage, loosened
connections 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.
• Turn on power supply 12 hours before test run in order to protect compressor.
• Make sure to read operation manual before test run. (Especially items to secure safety.)
Unit conditions at service Check code Actions to be taken for service (summary)
The trouble is reoccurring.
Displayed
Judge the problem and take a corrective action according
to “8-3. SELF-DIAGNOSIS ACTION TABLE”.
Not displayed
Conduct troubleshooting and ascertain the cause of the
trouble.
The trouble is not reoccurring.
Logged
1Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise, etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
trouble occurred, matters related to wiring, etc.
2Reset check code logs and restart the unit after finishing
service.
3There is no abnormality in electrical component,
controller board, etc.
Not logged
1Re-check the abnormal symptom.
2Conduct troubleshooting and ascertain the cause of the
trouble.
3Continue to operate unit for the time being if the cause
is not ascertained.
4There is no abnormality concerning of parts such as
electrical component, controller board, etc.

17
OCH562D
8-3. SELF-DIAGNOSIS ACTION TABLE
<Abnormalities detected when the power is turned on>
Check Code Abnormal point and detection method Cause Judgment and action
None —
1No voltage is supplied to
terminal block (TB1) of
outdoor unit.
a) Power supply breaker is
turned off.
b) Contact failure or
disconnection of power
supply terminal
c) Open phase (L or N phase)
2Electric power is not charged
to power supply terminal of
outdoor power circuit board.
a) Contact failure of power
supply terminal
b) Open phase on the outdoor
power circuit board
Disconnection of connector
LI, NI
3Electric power is not supplied
to outdoor controller circuit
board.
a) Disconnection of connector
(CNDC)
4Disconnection of reactor (DCL)
5Defective outdoor power cir-
cuit board
6Defective outdoor controller
circuit board
1Check following items.
a) Power supply breaker
b) Connection of power supply terminal
block (TB1)
c) Connection of power supply terminal
block (TB1)
2Check following items.
a) Connection of power supply terminal
block (TB1)
b) Connection of terminal on outdoor power
circuit board
Check connection of the connector LI or NI.
Refer to "8-6. TEST POINT DIAGRAM".
3Check connection of the connector CNDC on
the outdoor controller circuit board.
Check connection of the connector CNDC
on the outdoor power circuit board. Refer to
"8-6. TEST POINT DIAGRAM".
4Check connection of reactor. (DCL)
Check connection of "DCL1" and "DCL2" on
the outdoor power circuit board.
5Replace outdoor power circuit board.
6Replace outdoor controller circuit board.
(When items above are checked but the
units cannot be repaired.)
F3
63L connector open
Abnormal if 63L connector circuit is open
for 3 minutes continuously from being
switched on.
63L: Low pressure switch
1Disconnection or contact fail-
ure of 63L connector on out-
door controller circuit board
2Disconnection or contact fail-
ure of 63L
363L is working due to refriger-
ant leakage or defective parts.
4Defective outdoor controller
circuit board
1Check connection of 63L connector on
outdoor controller circuit board.
Refer to "8-6. TEST POINT DIAGRAM".
2Check the 63L side of connecting wire.
3Check refrigerant pressure.
Charge additional refrigerant.
Check continuity of 63L.
Replace low pressure switch if it is defective.
4Replace outdoor controller circuit board.
F5
63H connector open
Abnormal if 63H connector circuit is open
for 3 minutes continuously from being
switched on.
63H: High pressure switch
1Disconnection or contact fail-
ure of 63H connector on out-
door controller circuit board
2Disconnection or contact fail-
ure of 63H
363H is working due to defec-
tive parts.
4Defective outdoor controller
circuit board
1Check connection of 63H connector on
outdoor controller circuit board.
Refer to "8-6. TEST POINT DIAGRAM".
2Check the 63H side of connecting wire.
3Check for continuity of 63H.
Replace high pressure switch if it is defec-
tive.
4Replace outdoor controller circuit board.
F9
2 connector open
Abnormal if both 63H and 63L connector
circuits are open for 3 minutes continu-
ously from being switched on.
63H: High pressure switch
63L: Low pressure switch
1Disconnection or contact
failure of connector (63H,63L)
on outdoor controller circuit
board.
2Disconnection or contact fail-
ure of 63H, 63L
363H and 63L are working due
to defective parts.
4Defective outdoor controller
board
1Check connection of connector (63H,63L) on
outdoor controller circuit board.
Refer to "8-6. TEST POINT DIAGRAM".
2Check the 63H and 63L side of connecting
wire.
3Check continuity of 63H and 63L.
Replace the pressure switch if it is defective.
4Replace outdoor controller circuit board.

18
OCH562D
Check Code Abnormal point and detection method Cause Judgment and action
EA
Miswiring of Interface unit/Flow temp.
controller-outdoor unit connecting wire
1. Outdoor controller circuit board can
automatically check the number of con-
nected Interface unit/Flow temp. control-
ler. Abnormal if the number cannot be
checked automatically due to miswiring
of Interface unit/Flow temp. controller-
outdoor unit connecting wire and etc.
after power is turned on for 4 minutes.
2. Abnormal if outdoor controller circuit
board recognizes excessive number of
Interface unit/Flow temp. controller.
1Contact failure or miswiring
of Interface unit/Flow temp.
controller-outdoor unit
connecting wire
2Diameter or length of Interface
unit/Flow temp. controller-
outdoor unit connecting wire is
out of specified capacity.
3Excessive number of Interface
unit/Flow temp. controller is
connected to 1 outdoor unit.
(2 units or more)
4Defective transmitting
receiving circuit of outdoor
controller circuit board
5Defective transmitting
receiving circuit of Interface/
Flow temp. controller board
6Noise has entered into power
supply or Interface/Flow
temp. controller-outdoor unit
connecting wire.
1Check disconnection or looseness or polar-
ity of Interface unit/Flow temp. controller-
outdoor unit connecting wire of Interface
unit/Flow temp. controller and outdoor units.
2Check diameter and length of Interface unit/
Flow temp. controller-outdoor unit connect-
ing wire.
Total wiring length: 80 m
(Including wiring connecting each Interface
unit/Flow temp. controller unit and between
Interface unit/Flow temp. controller and out-
door unit)
Also check if the connection order of flat
cable is S1, S2, S3.
3Check the number of Interface unit/Flow
temp. controller that is connected to 1 out-
door unit. (If EA is detected.)
4–5 Turn the power off once, and on again to
check.
Replace outdoor controller circuit board
or Interface/Flow temp. controller board if
abnormality occurs again.
6Check transmission path, and remove the
cause.
Note: The descriptions above, 1–6, are for
EA, Eb and EC.
Eb
Miswiring of Interface unit/Flow temp.
controller-outdoor unit connecting wire
(converse wiring or disconnection)
Outdoor controller circuit board can
automatically set the unit number of
Interface unit/Flow temp. controller.
Abnormal if the Interface unit/Flow
temp. controller number cannot be
set within 4 minutes after power on
because of miswiring (converse wiring or
disconnection) of Interface unit/Flow temp.
controller-outdoor unit connecting wire.
1Contact failure or miswiring
of Interface unit/Flow temp.
controller-outdoor unit
connecting wire
2Diameter or length of Interface
unit/Flow temp. controller-
outdoor unit connecting wire is
out of specified capacity.
4Defective transmitting
receiving circuit of outdoor
controller circuit board
5Defective transmitting
receiving circuit of Interface/
Flow temp. controller board
6Noise has entered into power
supply or Interface unit/Flow
temp. controller-outdoor unit
connecting wire.
EC
Startup time over
The unit cannot finish startup process
within 4 minutes after power on.
1Contact failure of Interface unit
/Flow temp. controller-outdoor
unit connecting wire
2Diameter or length of Interface
unit/Flow temp. controller-
outdoor unit connecting wire is
out of specified capacity.
3Noise has entered into power
supply or Interface unit/Flow
temp. controller-outdoor unit
connecting wire.

19
OCH562D
<Abnormalities detected while unit is operating>
Check Code Abnormal point and detection method Cause Judgment and action
U1
High pressure (High pressure switch
63H operated)
Abnormal if high pressure switch 63H
operated ( * ) during compressor opera-
tion.
*4.15 MPa
63H: High pressure switch
1Decreased water flow
2Clogged filter of water pipe
3Dirt of plate heat exchanger
4Locked water pump
5Malfunction of water pump
6Clogged or broken pipe
7Locked outdoor fan motor
8Malfunction of outdoor fan
motor
9Short cycle of outdoor unit
0Dirt of outdoor heat exchanger
1Decreased airflow caused by
defective inspection of outside
temperature thermistor
(It detects lower temperature
than actual temperature.)
2Disconnection or contact
failure of connector (63H) on
outdoor controller board
3Disconnection or contact fail-
ure of 63H connection
4Defective outdoor controller
board
5Defective operation of linear
expansion valve
6Malfunction of fan driving cir-
cuit
1–5Check water circuit and repair the defect.
6Check piping and repair the defect.
7–0Check outdoor unit and repair the defect.
1Check the detected temperature of outside
temperature thermistor on LED display.
(SW2: Refer to "8-7.OUTDOOR UNIT
OPERATION MONITOR FUNCTION".)
2–4Turn the power off and check F5 is
displayed when the power is turned on
again.
When F5 is displayed, refer to “Judgment
and action” for F5.
5Check linear expansion valve.
Refer to "8-5.HOW TO CHECK THE COMPONENTS".
6Replace outdoor controller board.
U2
High discharging temperature
Abnormal if discharge temperature
thermistor (TH4) exceeds 125:or 110:
continuously for 5 minutes.
Abnormal if during defrosting discharge
temperature thermistor (TH4) exceeds
110:continuously for 30 minutes.
High comp. surface temperature
Abnormal if comp. surface temperature
(TH34) exceeds 170:.
In the case of high comp. surface tem-
perature error, compressor does not restart
unless the thermistor (TH34) becomes less
than 95:.
1Overheated compressor oper-
ation caused by insufficient
refrigerant
2Defective thermistor
3Defective outdoor controller
board
4Defective operation of linear
expansion valve
5In the case of the unit does
not restart:
Detection temp. of thermistor
(TH34) ]95:
1Check intake super heat.
Check leakage of refrigerant.
Charge additional refrigerant.
23 Turn the power off and check if U3 is
displayed when the power is turned ON
again.
When U3 is displayed, refer to “Judgment
and action” for U3.
4Check linear expansion valve.
Refer to "8-5. HOW TO CHECK THE
COMPONENTS".
U3
Open/short circuit of discharge
temperature thermistor (TH4)/comp.
surface thermistor (TH34)
Abnormal if open (3:or less) or short
(217:or more) is detected during
compressor operation.
(Open (3:or less) detection is inoperative
for 10 minutes of compressor starting
process and for 10 minutes after or during
defrosting.)
1Disconnection or contact fail-
ure of connector (TH4/TH34)
on the outdoor controller cir-
cuit board
2Defective thermistor
3Defective outdoor controller
circuit board
1Check connection of connector (TH4/TH34)
on the outdoor controller circuit board.
Check the lead wire for thermistor (TH4/
TH34). Refer to "8-6. TEST POINT
DIAGRAM".
2Check resistance value of thermistor (TH4/
TH34) or temperature on LED display.
(Thermistor/TH4/TH34: Refer to "8-5.HOW
TO CHECK THE COMPONENTS".)
(SW2: Refer to"8-7.OUTDOOR UNIT
OPERATION MONITOR FUNCTION".)
3Replace outdoor controller board.

20
OCH562D
()
Check Code Abnormal point and detection method Cause Judgment and action
U4
Open/short of outdoor unit thermistors
(TH3, TH32, TH33, TH6, TH7, and TH8)
Abnormal if open or short is detected
during compressor operation.
Open detection of thermistors TH3, TH32
and TH6 is not detected for 10 seconds to
10 minutes after compressor starting and
10 minutes after and during defrosting.
Note:
Check which unit has abnormality in
its thermistor by switching the mode of
SW2. (Refer to "8-7.OUTDOOR UNIT
OPERATION MONITOR FUNCTION".)
Heat sink thermistor (TH8) is in the power
module.
1Disconnection or contact fail-
ure of connectors
Outdoor controller circuit board:
TH3, TH32, TH33, TH6/TH7
Outdoor power circuit board:
CN3
2Defective thermistor
3Defective outdoor controller
circuit board
1 Check connection of connector (TH3, TH32,
TH33, TH6/TH7) on the outdoor controller circuit
board. Check connection of connector (CN3) on
the outdoor power circuit board. Check the lead
wire for thermistor (TH3, TH32, TH33, TH6, TH7,
TH8). Refer to "8-6. TEST POINT DIAGRAM".
2 Check resistance value of thermistor (TH3, TH32,
TH33, TH6, TH7, TH8) or check temperature on
LED display.
(Thermistor/TH3, TH32, TH33, TH6, TH7,
TH8: Refer to "8-5.HOW TO CHECK THE
COMPONENTS.")
(SW2: Refer to "8-7.OUTDOOR UNIT
OPERATION MONITOR FUNCTION".
)
3Replace outdoor controller circuit board.
U5
Temperature of heat sink
Abnormal if heat sink thermistor (TH8)
detects 94°C.
1
The outdoor fan motor is locked.
2Failure of outdoor fan motor
3Airflow path is clogged.
4Ambient temperature is high.
5Defective thermistor
6Defective input circuit of
outdoor power circuit board
7Failure of outdoor fan drive
circuit
12 Check outdoor fan.
3Check airflow path for cooling.
4
Check if there is something which causes
temperature rise around outdoor unit.
(Upper limit of ambient temperature is 46:.)
Turn off power, and on again to check if U5
is displayed within 30 minutes. If U4 is dis-
played instead of U5, refer to check code U4.
5Check resistance value of thermistor (TH8)
or temperature by microcomputer.
(Thermistor/TH8: Refer to "8-5.HOW TO CHECK THE
COMPONENTS".) (SW2: Refer to "8-7.OUTDOOR
UNIT OPERATION MONITOR FUNCTION".)
6Replace outdoor power circuit board.
7Replace outdoor controller circuit board.
U6
Power module
Check abnormality by driving power module
in case overcurrent is detected.
(UF or UP error condition)
1Defective outdoor power cir-
cuit board
2
Decrease of power supply voltage
3Loosens, disconnection or
reverse of compressor wiring
connection
4Defective compressor
1Replace outdoor power circuit board.
2Check facility of power supply.
3Correct the wiring (U•V•W phase) to
compressor. Refer to "8-6. TEST POINT
DIAGRAM (Outdoor power circuit board)".
4Check compressor referring to "8-4.HOW TO
CHECK THE PARTS".
U7
Too low superheat due to low discharge
temperature
Abnormal if discharge superheat is
continuously detected −15:or less for
3 minutes even though linear expansion
valve has minimum open pulse after
compressor starts operating for 10
minutes.
1Disconnection or loose
connection of discharge
temperature thermistor (TH4)
2Defective holder of discharge
temperature thermistor
3
Disconnection or loose connection
of linear expansion valve’s coil
4Disconnection or loose
connection of linear expansion
valve’s connector
5Defective linear expansion valve
12 Check the installation conditions of dis-
charge temperature thermistor (TH4).
3Check the coil of linear expansion valve.
Refer to "8-5.HOW TO CHECK THE
COMPONENTS".
4Check the connection or contact of LEV-A
and LEV-B on outdoor controller circuit board.
5
Check linear expansion valve.
Refer to "8-4.HOW TO CHECK THE PARTS".
U8
Outdoor fan motor
Abnormal if rotational frequency of the fan
motor is not detected during DC fan motor
operation.
Fan motor rotational frequency is abnormal if;
• 100 rpm or below detected continuously
for 15 seconds at 20:or more outside
air temperature
• 50 rpm or below or 1500 rpm or more
detected continuously for 1 minute.
1Failure in the operation of the
DC fan motor
2Failure in the outdoor circuit
controller board
1Check or replace the DC fan motor.
2Check the voltage of the outdoor circuit
controller board during operation.
3Replace the outdoor circuit controller board.
(When the failure is still indicated even after
performing the remedy 1above.)
Thermistors Open detection Short detection
Symbol Name
TH3 Thermistor <Liquid temperature> −40°C or below 90°C or above
TH32 Thermistor <Inlet water temperature> −40°C or below 102°C or above
TH33 Thermistor <Suction pipe temperature> −40°C or below 90°C or above
TH6 Thermistor <Plate HEX liquid temperature> −40°C or below 90°C or above
TH7 Thermistor <Ambient temperature> −40°C or below 90°C or above
TH8 Internal thermistor −35°C or below 170°C or above