Gree GWH09UB-K6DNA4A Service Manual page 37

2.2 Delay protection of compressor
When compressor is stopped, it needs 3min to restart up the compressor. Once compressor is started up, compressor wont stop
operate within 6in according to the change of temperature.
2.3 Discharge temperature protection of compressor
(1)When TBdischarge B≥98°C, prohibit increasing frequency;
(2)When TBdischarge B≥103°C, prohibit decreasing frequency;
(3)When TBdischarge B≥110°C, compressor stops operation;
(4)When TBdischarge B≤90°C, protection is released.
2.4 Communication malfunction
When the unit hasnt received correct signal for 3mins consecutively, its the communication malfunction. The complete unit will stop
operation.
2.5 Module protection
During module protection, compressor stops operation. When compressor has stopped operation for 3min, compressor will resume
opeation. When module protection occurs all the time when starting up compressor for 6 times consecutively, compressor cant be
started any more (turn off the unit with remote controller can clear up module, and the accumulative times of module protection).
When the operation time of compressor is more than 6mins, the accumulative times will be cleared up.
2.6 When DC bus voltage is lower than 150V or more than 420V, compressor will delay 30s to stop operation. When DC bus
voltage is more than 200C and less than 400V, protection will be resumed. Compressor will resume operation after it has stopped
for 3mins. During low pressure protection, main relay will break off. When low voltage protection is resumed, main relay will be
closed.
2.7 When overload malfunction is occurred, compressor stopped operation and outdoor fan will delay 30s to stop operation; when
malfunction is cleared up and compressor has stopped for 3min, the unit will resume operation.
2.8 Power protection of compressor
(1)When PCB≥1500w, prohibit increasing frequency;
(2)When PCB≥1600w, decrease frequency to operate;
(3)When PCB≥1700w, compressor stops operation;
(4)When PCB≤1400w, protection is released.
2.9 Malfunction of temperature sensor
Name of temperature sensor
Outdoor ambient
Outdoor tube temperature
Air discharge
2.10 When outdoor fan is open-circuited or current is more than 0.8aA, outdoor fan will stop operation and then be restarted up
4s later. If the fan stops operation for 6 times successively, its the malfunction of fan. And then compressor will stops operation.
3mins later, the malfunction of fan will be cleared and restart up outdoor fan and compressor. If malfunction of fan occurs for 6
times successively, outdoor fan wont be restarted up. Turn off the unit with remote controller can clear up malfunction and the
accumulated timer of malfunction. After compressor operates for 6mins successively, the accumulated malfunction times of fan will
be cleared.
34
Malfunction condition
Its detected that the temperature sensor is open/short-circuited for
5s consecutively
Its detected that the temperature sensor is open/short-circuited for
5s consecutively; it wont be detected within 10mins after defrosting
After compressor operates for 3min,its detected that the
temperature sensor is open/short-circuited for 5s consecutively
Service Manual
Technical Information