Fan Mode; Heating Mode - Gree FGR20/BNa-M Service Manual

Room temperature is set to be 16-30℃ and 24℃ is default.
When Tambient ≥ Tset+2℃ , the unit will run in cooling mode. In this case, compressor and outdoor fan run;
Indoor fan runs at low speed.
When Tambient ≤ Tset-2℃ , the unit will stop running in cooling mode. In this case, compressor and outdoor
fan stop running.
When Tset -2℃＜ Tambient ≤ Tset+2℃ ,the unit will be in the state that the compressor runs for 6min and
stops for 4min in cycle. Indoor fan runs at low speed.

2.8 Fan mode

Sequence chart during fan operation
Auxiliary electric
heater
When fan mode is set, the unit will run in fan mode.

2.9 Heating mode

Sequence chart of unit start during heating operation
Control object
Compressor
Outdoor fan
Indoor fan
Auxiliary electric
heater (AEH)
4-way valve
Control object
Compressor
Outdoor fan
Indoor fan
Outdoor
4-way valve
Run for 45min
Control object
ON
Other parts
ON
Indoor fan
ON
OFF
ON
OFF
(Vset )
OFF
(A nti cold air condition)
OFF
5s
>180s
Duct Type Split Air Conditioner
ON
ON
OFF
ON
OFF
ON
OFF
ON
OFF
60s
45min50s
Time
Defrosting command
OFF
V(set)
Time
ON
(AEH working condition )
ON
ON
Time
>180s
Service Manual
5s
17
CONTROL