Panasonic S-28MD1E5 - Page 174

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6. Inspection and Characteristics of Parts
2WAY SYSTEM
Trouble Diagnosis
6
6. Inspection and Characteristics of Parts
2WAY SYSTEM
Trouble Diagnosis
U - V 8.8
8HP 10HP 12HP 14HP 16HP 18HP 20HP
U - W
Resistance
(at 20°C)
DMSBG75SY
unit : ohm
8.8
V - W 8.8
U - VU - W
Outdoor unit
Inverter compressor (at 20°C) Constant speed compressor (at 25°C)
unit : ohm
V - W U - VU - W V - W
0.570 0.587 0.580
0.570 0.587 0.580
1.083 1.123 1.096
1.695 1.716 1.667
0.570 0.587 0.580
1.865 1.884 1.835
0.570 0.587 0.580
1.695 1.716 1.667
0.570 0.587 0.580
1.865 1.884 1.835
8HP
10HP
12HP
14HP
16HP
18HP
20HP
0.570 0.587 0.580
1.695 1.716 1.667
(4) Coil Resistance of Outdoor Unit Fan Motor
(5) Coil Resistance of Compressor Motor
(6) Characteristics of Thermistor
Resistor (kΩ)
Resistor (kΩ)
●
Ambient air temperature
thermistor (TO)
● Suction temperature
thermistor (SCT)
Temperature(
°C)
Temperature(
°C)
● Refrigerant gas outlet of
dual-tube thermistor (SCG)
● Heat exchanger liquid
temperature thermistor (EXL)
● Heat exchanger gas
temperature thermistor (EXG)
40
35
30
25
20
15
10
5
0
-10-15-20 20
20 30 40 50 60
151050-5
8
7
6
5
4
3
2
1
0
Resistor (kΩ)
Temperature(°C)
● Discharge temperature (DISCH) thermistor
0908070605040302010
0
40
60
80
100
120
140
160
180
200
20
5JD650ZBA22
5JD650ZBA22
5JD420ZCA22
C-SDN523H8B
C-SDN453H8B
C-SDN523H8B
C-SDN453H8B
C-SDN523H8B
5JD650ZBA22
5JD650ZBA22
5JD650ZBA22
5JD650ZBA22
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7. Test Pin
2WAY SYSTEM
Trouble Diagnosis
When the test pin on the outdoor unit control PCB is short-circuited, each part can be operated individually.
•
After turning OFF the main unit power, short-circuit the test pin (CN22, black), then turn the power back ON.
Output is performed in the sequence shown in the table below, for 0.5 seconds each.
OperationOperationOutput
Relay RY12 4-way valve (20s) Relay RY8 Save valve (SAVE)
Output
Relay RY2
6
7
8
9
Relay RY1
1
2
3
4
5
Relay RY4 Bypass valve (BPV)
Relay RY6 Oil recovery valve (ORVR)
Relay RY3
Crankcase 2 (CH2)
Crankcase 1 (CH1)
Crankcase 3 (CH3)Relay RY11 Refrigerant balance valve (RBV)
Relay RY10 Refrigerant control valve (RCV)
SM830204-05_2WAY SYS.indb 32 2015/01/20 17:45:23