55
Installation and Maintenance
Service Manual
If voltage on the DC bus is below 150V or over 420V, the
compressor will stop and the outdoor fan will stop with a timelag
of 30 seconds. When voltage on the DC bus returns to its normal
value and the compressor has stayed at stop for at least3 minutes,
the compressor will resume its operation.
⑥
Faults of temperature sensors
Designation of sensors Faults
Indoor ambient
temperature
The sensor is detected to be open-
circuited or short-circuited for successive
5 seconds
Indoor tube
temperature
The sensor is detected to be open-
circuited or short-circuited for successive
5 seconds
Outdoor ambient
temperature
The sensor is detected to be open-
circuited or short-circuited for successive
30 seconds
Outdoor tube
temperature
The sensor is detected to be open-
circuited or short-circuited forsuccessive
30 seconds, and no detection is
performed within 10 minutesafter defrost
begins.
Exhaust
After the compressor has operated for
3 minutes, the sensor is detectedto
be open-circuited or short-circuited for
successive 30 seconds.
Overload
After the compressor has operated for
3 minutes, the sensor is detectedto
be open-circuited or short-circuited for
successive 30 seconds.
6. Function and Control
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