Defrosting Operation (Available For Heating Only) - Midea MSV1-09HRDN1 Service Manual

Room temp. down
11.6.6. Indoor evaporator high-temperature protection at heating mode
Condition (T= Indoor exchanger temp.)
T<48℃
53℃<T<63℃
T>63℃
11.6.7. The current protection
Current up
Current down
11.6.8. The temp. compensation
Jump setting in indoor PCB
J2 On
J3 On
ΔT 0℃

11.7. Defrosting operation (Available for heating only).

11.7.1 Defrosting condition:
11.7.1.1. When outdoor temp. is more than 0℃,
Defrosting starts when meeting one of the following conditions,
a. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
than 40 minutes, and the temperature remains consecutively -4°c for more than 3 minutes,
b. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
than 80 minutes, and the temperature remains consecutively -2°c for more than 3 minutes
11.7.1.2. When outdoor temp. is less than 0℃,
Defrosting starts when meeting one of the following conditions,
a. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
than 40 minutes, and the temperature remains consecutively -6°c for more than 3 minutes,
b. The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
than 40 minutes, and the temperature remains consecutively -6°c for more than 3 minutes,
c. The temperature of indoor unit pipe decreases 5°c than before
The temperature of outdoor heat exchanger remains consecutively lower than 3°c for more
11.7.1.3.
than 120 minutes, and the temperature remains consecutively -2°c for more than 3 minutes
11.7.2 Ending condition of defrosting
If one of following conditions is satisfied, end the defrost and turn into heating mode:
a. The defrost time has reached to 10 minutes.
b. When the temperature of outdoor heat exchanger rises up to 8°C and this continues for more than 80
seconds.
c. When the temperature of outdoor heat exchanger rises up to 12°C
27
T<1.0℃
1.0℃<T<2.0℃
T>2.0℃
Model Current
18000btu/h I>19.0 A
15.0.A<I<19.0A
I< 12.5A
18000btu/h I>18.5 A
14.5A<I<18.5A
I< 12.0A
On
Off
-4℃
Service manual
Compressor
On
Decrease frequency of compressor
Off
Compressor
Off
Decrease frequency of compressor
On
Off
Decrease frequency of compressor
On
Off
On
-2℃
High
Med.
Low
Off
Off
0℃