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Service Manual
Technical Information
operation due to freeze protection. If T
inner tube
≥T
temperature of freeze protection
and the compressor has stopped for 3min, the complete unit can
resume operation.
11.3 If the unit is stopped because of freeze protection for 6 times successively, it can’t resume operation automatically and the
malfunction will be displayed continuously, which can only be resumed by pressing ON/OFF button. During operation, if operation
time of compressor is over, the times of stop operation because of freeze protection will be cleared. If turn off the unit or switch to fan/
heating mode, malfunction and times of malfunction is eliminated immediately.
12. Overload protection
12.1 Overload protection under cooling or drying mode: If T
overload stop operation temp. in cooling
≤T
outdoor tube
, the unit stops operation because of
overload in cooling; if T
outdoor tube
< T
overload limit-frequecny temp in cooling
and the compressor has stopped for 3min, the complete unit can resume
operation.
12.2 Under cooling or drying mode, if T
overload limit-frequecny temp. in cooling
≤T
outdoor tube
, the frequency of compressor may decrease;
12.3 Overload protection under heating mode: If T
overload stop operation temp. in heating
≤T
indoor tube
, the unit stops operation because of overload in
heating; if T
indoor tube
<T
overload limit-frequecny temp. in heating
and the compressor has stopped for 3min, the complete unit can resume operation.
12.4 Under heating mode, if T
overload limit-frequecny temp. in heating
≤T
indoor tube
, operation frequency of compressor may decrease;
12.5 If the unit is stopped because of overload protection for 6 times successively, it can’t resume operation automatically and the
malfunction will be displayed continuously, which can only be resumed by pressing ON/OFF button. During operation, if operation time
of compressor is over, the times of stop operation because of overload protection will be cleared. If turn off the unit, fan or switch to fan/
heating mode, malfunction and times of malfunction is eliminated immediately.
13. Discharge temperature protection of compressor
13.1 If T
stop operation temperature for discharge
≤T
discharge
, the unit stops operation because of discharge protection; If T
discharge
<T
normal speed decreasefrequency for
discharge
and compressor has stopped for 3min, the complete unit can resume operation;
13.2 If T
normal speed decrease-frequency for discharge
≤T
discharge
, operation frequency of compressor may decrease;
13.3 If the unit is stopped because of discharge protection of compressor for 6 times successively, it can’t resume operation
automatically,which can only be resumed by pressing ON/OFF button. During operation, if operation time of compressor is over, the
times of stop operation because of discharge protection will be cleared. If turn off the unit, or switch to fan/heating mode, malfunction
and times of malfunction is eliminated immediately.
14. Current protection function
14.1 If I
AC current
≥I
limit frequency current for current protection
,operation frequency of compressor will stop rising;
If I
AC current
≥I
decrease frequency current for current protection
,operation frequency of compressor may decrease;
If I
AC current
≥I
stop operation current for current protection
,the unit will stop operation because of overcurrent protection.
14.2 If the unit is stopped because of overcurrent for 6 times successively, it can’t resume operation automatically, which can only be
resumed by pressing ON/OFF button. During operation, if operation time of compressor is over, the times of stop operation because of
overcurrent protection will be cleared.
15. Voltage drop protection
During operation of compressor, if the voltage is decreasing quickly, the system may stop operation and voltage drop malfunction is
caused. 3min later, the system will be restarted up automatically.
16. Communication malfunction
When it hasn’t received the correct signal from indoor unit for 3min, the unit will stop operation because if communication malfunction;
If communication malfunction is eliminated and compressor has stopped for 3min, the complete unit can resume operation.
17. IPM module protection
After compressor is turned on, if the overcurrent happens for IPM module, or control voltage is too low because of abnormal causes,
IPM will detect module protection signal immediately. Once it detected the module protection signal, the unit will stop operation
because of module protection. If module protection is resumed and compressor has stopped for 3min, the complete unit will resume
operation.
If the unit is stopped because of module protection for 3 times successively, the unit can resume operation automatically unless press
ON/OFF button. If the operation time for compressor is over, the times of stop operation because of module protection will be cleared.
18. Overheat protection of module
18.1 If T
normal speed frequency-decreasing temp. of module
≤T
module
, the operation frequency of compressor may decrease;
18.2 If T
stop operation temperature of module
≤T
module
, the syste will stop operation for protection. If T
module
<T
frequency-limiting temperature of module
and compressor
has stopped for 3min, the complete unit will resume operation;
18.3 If the unit is stopped because of overheating of compressor module for 6 times successively, it can’t resume operation
automatically,which can only be resumed by pressing ON/OFF button. During operation, if operation time of compressor is over, the
times of stop operation because of compressor overheating protection will be cleared. If turn off the unit, or switch to fan mode, times of
malfunction is eliminated immediately.
19. Overload protection of compressor
19.1 If it detected that the overload switch for compressor is open for 3min successively, the complete unit will stop operation for
protection;
19.2 If overload protection is resumed and compressor has stopped for 3min, the complete unit can resume operation;
19.3 If the unit stops operation because of overload protection for compressor for 3times successively, it can’t resume operation
automatically, which can only be resumed by pressing ON/OFF button. After compressor has operated for 30min, overload protection
times for compressor will be eliminated.
