North American HVAC MOC-12HFN1-MS0W, Service Manual

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Electrical Control Function
Electrical Control System 115
For 24K(Excluding MOG-24HFN1-MT0W) & 48K units:
Condition of defrosting:
T4
3℃
Time1
Time2
Time conditions:
time1
Time conditions(Meet the following conditions)
1.Running in heating mode
2. T4
≥ 3 ℃
3. Compressor is on
4. T3
≤ TempEnterDefrost_ADD ℃
Cleared conditions (Meet any one of the following conditions)
1. Compressor is off.
2. T3
＞ TempEnterDefrost_ADD ℃
Time2
Time conditions (Meet the following conditions)
1.Running in heating mode
2. T4<3
℃
3. Compressor is on
4. T3
≤ TempEnterDefrost_ADD
℃
Cleared conditions (Meet any one of the following conditions)
1. Compressor is off and T3
＞
TempEnterDefro2
℃
last for 20 minutes
2. Running in cooling mode.
3. Compressor is off for 1 hour.
Condition of entry defrosting:
time1+ time2
≥ 40 minutes, When defrosting is end,time1 and time2 are cleared.
Condition of ending defrosting:
If any one of following items is satisfied, defrosting will stop and the machine will turn to normal heating
mode.
① The defrosting time achieves 10min;
② T3 ≥
TempQuitDefrost_ADD
℃ ;
③
T3
≥
7
℃
for 60seconds.
For 36K units:
Condition of defrosting:
T3 ≤ TempEnterDefrost_ADD ℃ and lasts for 40 minutes.
Condition of ending defrosting: