5
- 35
1
2
3
4
5
6
7
8
9
6. Test Pin
2WAY VRF SYSTEM
Trouble Diagnosis
5
- 35
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), then turn the power ON.
Output is performed in the sequence shown in the table below, for 0.5 seconds each.
Output
Operation
1
Relay RY12
4-way valve (20s)
2
Relay RY8
Bypass valve (BPV)
3
Relay RY6
Oil recovery valve (ORVR)
4
Relay RY11
Refrigerant balance valve (RBV)
5
Relay RY10
Refrigerant control valve (RCV)
6
Relay RY4
Save valve (SAVE)
7
Relay RY2
Crankcase heater 2 (CH2)
8
Relay RY1
Crankcase heater 1 (CH1)
9
Relay RY7
PDV (OPTION)
10 Relay RY9
O
2
(OPTION)
11 Relay RY5
Accumulator control valve (ACV)
6. Inspection and Characteristics of Parts
2WAY SYSTEM
Trouble Diagnosis
U - V
2.8
72
96
120
144
U - W
Resistance
DMSBJ75SY Resistance (at 68°F)
unit : ohm
2.8
V - W
2.8
U - V
U - W
72
Outdoor Unit
Type
Outdoor Unit Type
1st compressor (at 68°F)
2nd compressor (at 68°F)
unit : ohm
V - W
U - V
U - W
V - W
0.246
0.246
0.246
0.167
96
0.167
0.167
0.246
120
0.246
0.246
0.246
0.246
C-9RVN393HOM
0.246
0.246
144
0.246
C-9RVN393HOM
C-9RVN393HON
C-9RVN393HOM
C-9RVN393HOM
0.246
0.246
0.246
C-9RVN393HOM
0.246
(5) Coil Resistance of Outdoor Unit Fan Motor
(6) Coil Resistance of Compressor Motor
(7) Characteristics of Thermistor (Outdoor Unit)
Resistor (kΩ)
Resistor (kΩ
)
Resistor (kΩ
)
●
Ambient air temperature thermistor (TO)
●
Suction temperature thermistor (SCT)
Temperature(
°F
)
Temperature(
°F
)
Temperature(
°F
)
●
Outlet of subcooling heat exchange thermistor (SCG)
●
Heat exchanger liquid temperature thermistor (EXL)
●
Heat exchanger gas temperature thermistor (EXG)
●
Discharge temperature thermistor (TD)
40
35
30
25
20
15
10
5
0
14
5
-4
32
194
176
158
140
122
104
86
68
50
68
68
86
104
122
140
59
50
41
32
23
8
7
6
5
4
3
2
1
0
0
40
60
80
100
120
140
160
180
200
20
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