Defrosting Mode(Available For Heating Mode) - Midea MSH-21HRN1-QB8 Service Manual

T temp. down
Compressor on
Fan on
The louver opens to Standard Angle ANGLHEAT when power is on for the first time

8.9 Defrosting mode(available for heating mode)

8.9.1 Defrosting condition:
Defrost starts when either of the following:
The compressor works under the condition that T3 lower than 0'C add up to more than 40 minutes, and under
the condition that T3 is lower than -3'C consecutively reaches 3 minutes.
Calculate from the end of latest defrost, that evaporator high temperature protection only closes outdoor fan with
the compressor still running add up to 90 minutes.
8.9.2 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:
8.9.3 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.
8.10 Auto mode
8.10.1 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).
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Service manual
Compressor on
Fan off
TE9
TE8
Defrost 10 or 6 minutes
5s
Compressor off
Fan off
T temp. up
T
TE7
25s
2s