Defrosting Mode(Available For Heating Mode); Auto Mode - Fisher FSArt-70HF Service Manual

7.9 Defrosting mode(available for heating mode)

7.9.1 Defrosting condition:
Defrost starts when either of the following:
T3 lower than 0'C, lasts for more than 40 minutes, provided that the time period then the temperature is lower than -3'C
consecutively reaches 3 minutes.
Calculate from the end of latest defrost, evaporator high temp. protection only closes outdoor fan with the compressor still
running. Add up to 90 minutes.
7.9.2 Conditions of defrost ending:
Defrosting ends when either of the following:
The time gets to 10 minutes.
T3>20'C.
The circulation is as following:
7.9.3 Defrosting Actions
Compressor
4-way valve
Outdoor fan
Indoor fan
10s
Remark: when the evaporator pipe temperature sensor more than TE16, the indoor fan start to run.

7.10 Auto mode

7.10.1 The air conditioner automatically selects one of the following operation modes: cooling, heating or fan only
according to the temperature difference between room temperature (TA) and set temperature (TS).
7.10.2 The indoor fan blows automatically in corresponding selected mode；
7.10.3 The motion of indoor fan's blade should accord with the selected operation mode；
7.10.4 One mode should be carried out for at least 15 minutes once selected. If the compressor cannot start for 15 minutes,
reselect the operation mode according to the room temp. and set temp., or reselect when the set temp. varies
Defrost 10 or 6 minutes
5s
27
25s
2s