Haier H2SM-(9+12)HEK03/R2 Service Manual page 19

The heating compressor starts and operate continuously for 10 minutes. After the compressor
has been operating for 45 minutes in total (the defrosting operation ends, or when starting in the cooling
mode, the compressor totals the operating time for zero clearance), detecting the defrosting sensor TE
(detecting the frosting of the outdoor heat exchanger) and the outdoor ambient temperature sensor TA
for straight 2 minutes, provided the following conditions are met, it will start for the defrosting operation:
In the place where it tends to frost, it is preferred to choose H. In the place where it does not
intend to frost, it is preferred to choose L. It is set M at delivery.
between two defrosting operations is 45 minutes.
between two defrosting operations is 55 minutes.
operates, 50 seconds later, the 4-way valve is OFF.
During the defrosting operation, such protections as the compressor's current protection are
available. The compressor may be interrupted for its protection or due to a trouble, and restore after 3
minutes. If it remains in the defrosting period, it will still start to defrost. The start of the compressor is
made by the rules for the start of the defrosting compressor. (if it cannot restore 3 times in a row, it will be
dealt with as in trouble and cancel defrosting.)
Once starting to defrostthe compressor must be guaranteed at least 2 minutes of operation before
canceling defrosting. As for the conditions to cancel defrosting, it will restore to the heating operation
from the defrosting operation as long as any of the following conditions is met.
The outdoor heat exchanger temperature is above 7 degrees for consecutive 80 seconds.
The outdoor heat exchanger temperature is above 5 degrees for consecutive 12 seconds.
The defrosting operation has lasted 9 minutes.
After the conditions for cancellation of defrosting are met, the following operations will follow:
The compressor stops, the outdoor fan starts, 50 seconds later, the 4-way valve is engaged,
and 60 seconds later, the compressor operates.
5.2.10 Double-unit defrosting operation
After receiving the signal to stop the indoor unit during the defrosting period, the unit must not be
turned off until the outdoor defrosting lasts more than 2 minutes.
When the double units are activated for defrosting, the activation of compressor B is 20 minutes
later than that of compressor A.
H2SM-(9+12)HEK03/R2
Selection of Jumper L M
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17
Funcitions and Control
H
6
Domestic Air Conditioner