7-26
CONTROL SYSTEM
Revision Y05-01
Service Manual - EMD Series
7.2. Heating Mode Protections
7.2.1. Outdoor coil Deicing (excluding RH Group)
Mode: Heating, Auto (at heating)
Temp: Selected desired Temp
Fan: Any
Timer: Any
I FEEL:Any
Control function
To protect the Outdoor coil from ice formation by controlling COMP & RV operation.
7.2.1.1. Deicer Activation Algorithm
1. static deicer threshold is -5°C
2. dynamic deicer threshold is change of 3°C in 3 minute in the OCT temperature
3. In first COMP activation (after SB or OFF), if OCT < 0
o
c, min time to first deicer id 10 min else 40 min.
4. 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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