-
418
-
'12 • PAC-T-173
E57
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or detection of service valve closure
(Models SRC40-60)
1. Applicable model
5. Troubleshooting
Models SRC40-60
Diagnosis
Countermeasure
NO
YES
NO
YES
Is the
service valve fully
opened?
Are the
connections of indoor
heat exchanger and/or return air
temperature thermistor
connectors OK?
NO
YES
NO
YES
Are the
characteristics of indoor heat
exchanger and/or return air
temperature thermistor
OK?
Is the low
pressure during operation
normal?
Indoor heat exchanger, return air temperature thermistor
Temperature-resistance characteristics
15
10
5
0
10
30
40
20
50
Temperature thermistor resistance (k
)
Temperature (°C)
5k
at 25°C
(Broken wire)
(Short circuit)
Open fully.
Correct indoor heat
exchanger, return air
temperature thermistor
connector connections.
Defective indoor heat
exchanger, return air
temperature thermistor
ª
Replace.
Charge refrigerant.
Defective indoor control
PCB
ª
Replace. (Defective
indoor heat exchanger,
return air temperature
thermistor input circuits)
2. Error detection method
• Judge insufficient refrigerant
amount by detecting the
temperature differnce between
indoor heat exchanger (ThI-R)
and indoor return air (ThI-A).
3. Condition of Error displayed
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amount is detected 3 times
within 60 minutes.
4. Presumable cause
• Defective indoor heat
exchanger temperature
thermistor
• Defective indoor return air
temperature thermistor
• Defective indoor control PCB
• Insufficient refregerant
amount
Note: When the compressor speed is 50 rps or under at 5 minutes after the start of compressor or the completion of defrosting, the low refrigerant protection control
judges, by detecting the difference between the indoor heat exchanger temperature (Th
I
-R) and the indoor return air temperature (Th
I
-A), that it is in the state of
gas low, and stops the compressor.
Cooling: Indoor return air temperature (Th
I
-A) – Indoor heat exchanger temperature (Th
I
-R)
≧
4 deg
Heating: Indoor heat exchanger temperature (Th
I
-R) – Indoor return air temperature (Th
I
-A)
≦
6 deg
Error code
Remote controller:
LED
Green
Red
Content
Indoor
Outdoor
Stays OFF
2 times flash
Keeps flashing
㧙
Summary of Contents for FDC Series
Page 95: ... 94 12 PAC T 173 Models FDT100VF 125VF 140VF H H H H H C B A F G D G PJF000Z285 ...
Page 98: ... 97 12 PAC T 173 Models FDEN60VF 71VF C 2 C 1 A B A B D C 1 C 2 C 1 C 2 E G F B PFA003Z817 ...
Page 113: ... 112 12 PAC T 173 b Wireless remote controller RCN E1R 60 17 150 Unit mm ...
Page 278: ... 277 12 PAC T 173 ー K ...
Page 346: ... 345 12 PAC T 173 Power PCB 1BSU OVNCFS 4GRNCEG VJG 2 ...
Page 518: ... 517 12 PAC T 173 3 5 SUPER LINK E BOARD SC ADNA E F SL2NA E and SL3N AE BE to control ...
Page 519: ... 518 12 PAC T 173 ...
