CONTROL SYSTEM
11-26 SM PXD 1-E.3 GB
11.12.2 Heating Mode Protections
a. Outdoor Coil Deicing (excluding RH Group)
Mode: HEATING, AUTO (at heating)
Temp: Selected desired temperature
Fan: Any
Timer: Any
I-FEEL: Any
Control function
To protect the outdoor coil from ice formation by controlling COMP & RV operation.
1) Deicer Activation Algorithm
a) Static deicer threshold is -5°C
b) Dynamic deicer threshold changes of 3°C in 3 minutes in the OCT
temperature
c) In first COMP activation (after SB or OFF), if OCT < 0°C, min time to first
deicer is 10 min else 40 min.
d) In a case of reading 3 successive OCT values below –10°C and
previously 3 successive OCT values of 43°C (4.7 K) , the unit will activate
deicing procedure.
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