30
Technical Information
Service Manual
operation automatically and error code will be displayed successively. Only press ON/OFF button can resume the operation. During
operation process, if compressor operates for more than 10min, times of stop operation due to discharge protection will be cleared.
Malfunction and malfunction times will be cleared immediately when turning off the unit, or switching to fan mode.
(12)Current protection function
①
If 12A ≤ I AC current, operation frequency of compressor will decrease or operation frequency of compressor will stop increasing;
②
If 17 A ≤ I AC current, the unit stops operation due to overcurrent protection. When compressor has stopped operation for 3min, the
complete unit can then be allowed to resume operation.
③
If the unit stops operation due to overcurrent protection for 6 times successively, the unit cant resume operation automatically.
Only press ON/OFF button can resume the operation. During operation process, if compressor operates for more than 10min, times
of stop operation due to overcurrent protection will be cleared.
(13)Voltage-dropping protection
During operation, if the voltage is decreasing quickly, the unit may stop operation and alarm voltage-dropping malfunction. 3 mins
later, the unit will be restarted up automatically.
(14)Communication malfunction
If it hasnt received the correct signal from indoor unit for 3min successively, the unit will stop operation due to communication
malfunction; If communication malfunction is resumed and compressor has stopped for 3min, the complete unit can then be allowed to
resume operation.
(15)IPM module protection
After compressor is turned on, if it causes overcurrent to IPM modular, or control voltage is too low due to some abnormal causes, IP
will generate modular protection signal. Main chip will detect the modular protection signal as soon as the unit is turned on. Once
modular protection signal is detected, the unit will stop operation immediately due to protection. If modular protection is resumed and
compressor has stopped for 3min, the complete unit can then be allowed to resume operation.
If the unit stops operation due to modular protection for 3 times successively, the unit cant resume operation automatically, except
pressing ON/OFF button. If compressor has operates for more than 10 min successively, the stop operation times due to modular
protection will be cleared.
(16)Modular overheating protection
①
If 80°C≤Tmodular, operation frequency of compressor will decrease or operation frequency of compressor will stop increasing;
②
If 95°C≤Tmodular, the unit will stop operation due to protection; if Tmodular<87°C, and compressor has stopped for 3min, the
complete unit can then be resume operation;
③
If the unit stops operation due to modular overheating protection for 6 times successively, the unit cant resume operation
automatically. Only press ON/OFF button can resume the operation. During operation process, if compressor operates for more
than 10min, times of stop operation due to modular overheating protection will be cleared. Malfunction times will be cleared immediately
when turning off the unit, or switching to fan mode.
(17)Overload protection of compressor
①
If it detected that overload switch of compressor breaks for 3s successively, the system will stop operation due to protection;
②
If it detected overload protection is resumed, and compressor has stopped for 3min, the complete unit can then be allowed to
resume operation;
③
If it detected that the unit stops operation due to overload protection of compressor for 3 times successively, the unit cant resume
operation automatically, except pressing ON/OFF button. After compressor operates for 30min, overload protection times of compressor
will be cleared.
