ESIE09-08 Special Control
Function 53
3.2 Defrosting Operation
The defrost operation is performed to solve frost on the outdoor unit heat exchanger when
heating mode is active to recover the heating capacity.
[Conditions to start]
The defrost operation is started referring following conditions.
Outdoor heat exchanger heat transfer co-efficient
Temperature of heat-exchange (Tb) < T
def
*
Timer (25 min. the minimum)
In addition, outdoor heat-exchanger co-efficient is derived from Tc, Te, and the compressor
load.
*T
def
can vary but is at least -10°C
[Fan defrosting]
When compressor stops, 80 sec. at low RPM
At start up compressor, 30 sec. at 950 RPM (step 9)
Then goes back to normal RPM
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