Gree GWH12UB-K3DNA4F Service Manual page 42

Service Manual
11.2 Under cooling or drying mode, if T
11.2.1 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 in cooling; if T
operation.
12.2 Under cooling or drying mode, if T
12.3 Overload protection under heating mode: If T
heating; if T <T
indoor tube overload limit-frequecny temp. in heating
12.4 Under heating mode. If T
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
and compressor has stopped for 3min, the complete unit can resume operation;
discharge
13.2 If T
normal speed decrease-frequency for discharge
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 13A≤I operation frequency of compressor may decrease or increase;
AC current,
14.2 If 17A≤I the system will stop operation because of overcurrent; the complete unit can resume operation only after the
AC current,
compressor stops for 3min;
14.3 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 3in, the complete unit can resume operation.
17. OPM 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
18.2 If T
stop operation temperature of module
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.
Installation and Maintenance
<6, the operation frequency of compressor may increase or decrease;
inner tube
< T
outdoor tube overload limit-frequecny temp in cooling
overload limit-frequecny temp. in cooling
overload stop operation temp. in heating
and the compressor has stopped for 3min, the complete unit can resume operation.
overload limit-frequecny temp. in heating
≤T , the unit stops operation because of discharge protection; If T
discharge
≤T , operation frequency of compressor may decrease or increase;
discharge
≤T , the operation frequency of compressor may decrease or increase;
module
≤T , the syste will stop operation for protection. If T
module
overload stop operation temp. in cooling
and the compressor has stopped for 3min, the complete unit can resume
≤T , the frequency of compressor may increase or decrease;
outdoor tube
≤T
indoor tube
≤T , operation frequency of compressor may increase or decrease;
indoor tube
≤T , the unit stops operation because of
outdoor tube
, the unit stops operation because of overload in
<T
discharge limit-frequecny temperature for
<T
module frequency-limiting temperature of module
and
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