Mitsubishi SRR60ZJ-S, Руководство по обслуживанию

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-
112
-
'10 • SCM-SM-094
Error code
Remote controller:
LED Green Red
Content
Indoor Stays OFF Keeps flashing
E57
Insufficient refrigerant amount
or detection of service valve closure
Outdoor – 2 times flash
1. Applicable model
5. Troubleshooting
All models
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)
(Shot 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
When the insufficient refrigerant
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