B. Continuously, outdoor heat exchanger temperature < 3°C for 80
minutes and outdoor heat exchanger temperature < -6°C for 3
minutes and outdoor air temperature > -1°C and Comp. is ON.
C. Continuously, outdoor heat exchanger temperature < 3°C for 40
minutes and outdoor heat exchanger temperature < -7°C and
outdoor air temperature -3°Cfor 3 minutes and Comp. is ON.
D. Continuously, outdoor heat exchanger temperature < 3°C for 40
minutes and outdoor heat exchanger temperature < -8°C for 3
minutes and outdoor air temperature < -3°C and Comp. is ON.
However, the first deice will start only after minimum of 60
minutes in operation.
(2nd deice and onward shall follow above conditions)
B. Auto clean deice
1. Purpose
To improve heating start-up operation by detecting the residual
ice on OD heat exchanger and perform deice operation
automatically before operation is started by ON Timer.
2. Control Content:
1). Auto deice is performed 15 min. before standby operation (pre-
deice operation in 15 min.).
2). When below deice conditions are fulfilled, auto clean deice
operation will start.
3). After auto clean deice is completed, standby operation is
performed as per load.
4). When deice conditions are not fulfilled, auto clean deice will
not happen and will continue with standby operation.
3. Deice condition:
OD air temp. t 0°C.
OD heat exchanger temp. 0°C for 14 min.
OD heat exchanger temp. -8°C for 10 min.
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