Mitsubishi Electric PUHZ-W50VHA-BS Service Manual page 52

Abnormal point and detection method
Error Code
Inlet water temperature
Abnormal if the following conditions are
detected for continuously 10 seconds.
1. Cooling mode
During compressor operation
TH32 < 3:
2. Heating mode (exclude defrosting)
PE
During compressor operation
TH32 < -10:
3. Defrosting mode
During compressor operation
TH32 < 0:
Thermistor
TH32: Inlet water temperature
9-4. HOW TO CHECK THE PARTS
PUHZ-W50VHA(-BS)
PUHZ-W85VHA(-BS)
PUHZ-HW112YHA(-BS)
PUHZ-HW140YHA(-BS)
PUHZ-HW140VHA2(-BS)
Parts name
TH3: Liquid pipe temp.
TH4: Discharge temp.
TH6: Plate Hex liquid pipe temp.
TH7: Ambient temp.
TH8: Heatsink temp.
TH32: Inlet water temp.
TH33: Comp. surface thermistor
(W50VHA(R1,R2), W85VHAR1)
Suction pipe temp. (HW112,140)
TH34: Comp. surface thermistor
(HW HA2R3)
•
Fan motor (MF1)
Solenoid valve coil
<Four-way valve>
(21S4)
Compressor
(MC)
U
V
W
Linear expansion valve
(LEV-A) (LEV-B) (LEV-C)
<except
HW•HA2R3 models> <HW•HA2R3 models>
Gray
M
1
M
2
Orange
3
Red
4
Yellow
5
Black
6
Solenoid valve coil
<Bypass valve>
(SV) W50,85
OCH439H
1 Reduced water flow
· Clogged filter
· Leak of water
2 Low temperature
· Low-load
· Low temperature inlet water
3 Defective water pump
4 Leakage or shortage of
refrigerant
PUHZ-W50VHAR1(-BS)
PUHZ-W85VHAR1(-BS)
PUHZ-HW112YHA2(-BS)
PUHZ-HW140YHA2(-BS)
PUHZ-HW140VHA2R1(-BS)
Disconnect the connector then measure the resistance with a tester.
(At the ambient temperature of 10 ~30 )
TH33 (W50VHA(R1,R2), W85VHAR1)
TH34 (HW
TH33 (HW112,140)
TH32
Refer to the next page.
Measure the resistance between the terminals with a tester.
(At the ambient temperature of 20 )
W50,85
2350±170
Measure the resistance between the terminals with a tester.
(Winding temperature 20 )
W50
0.640
Disconnect the connector then measure the resistance with a tester.
(Winding temperature 20°C)
Gray
Gray - Black
1
Orange
2
Red
3
Yellow 4
Black
5
Measure the resistance between the terminals with a tester.
(At the ambient temperature of 20 )
1450±150
Case
12 Check water piping.
3 Check water pump.
4 Check intake superheat.
PUHZ-W50VHAR2(-BS)
PUHZ-HW112YHA2R1(-BS)
PUHZ-HW140YHA2R1(-BS)
PUHZ-HW140VHA2R2-BS
Check points
Normal
TH4
160k ~410k
HA2R3)
•
TH3
TH6
4.3k ~9.6k
TH7
4.4k ~9.8k
TH8
39k ~105k
Normal
HW112,140
1435±150
Normal
W85 HW140V(2)
0.188
0.865 ~0.895
Normal
Gray - Yellow Gray - Orange
Gray - Red
46±3Ω
Normal
52
Judgment and action
Check leakage of refrigerant.
PUHZ-HW112YHA2R3(-BS)
PUHZ-HW140YHA2R3(-BS)
PUHZ-HW140VHA2R3(-BS)
Abnormal
Open or short
Abnormal
Open or short
Abnormal
HW112,140Y(2)
Open or short
0.302
Abnormal
Open or short
Abnormal
Open or short