Defrosting Mode - Gree FGR20/BNa-M Service Manual

Duct Type Split Air Conditioner
Service Manual
Sequence chart of unit stop during heating operation
Room temperature is set to be 16-30℃ and 24℃ is default.
When Tambient ≤ Tset-1℃ , the unit will run in heating mode. In this case, compressor and outdoor fan run;
Indoor fan runs at setting speed and under the condition of anti-cold air.
When Tambient ≥ Tset+1℃ ,compressor and outdoor fan stop running, the 4-way valve is still energized
and indoor fan runs under the condition of blowing residual heat.
When Tset -1℃＜ Tambient ＜ Tset+1℃ ,the unit will keep its previous running state.

2.10 Defrosting mode

Sequence chart of unit start during defrosting operation
Sequence chart of unit stop during defrosting operation
CONTROL
18
Control object
ON
Compressor
ON
Outdoor fan
ON
Indoor fan
Auxiliary ON
electric heater
ON
4-way valve
10s
Control object
Compressor
Outdoor fan
Indoor fan
Outdoor
Auxiliary electric
heater
4-way valve
OFF
OFF
OFF
(AEH woking condition)
60s
ON
ON
ON
ON
ON
45min50s
Run for 45min Defrosting command
Time
OFF
OFF
OFF
OFF
60s
Time