12-20
CONTROL SYSTEM
Revision Y05-01
Service Manual - ALPHA
12.9.3 Heating
Mode
Protections
Outdoor coil Deicing (excluding RH Group)
Mode: Heating, Auto (at heating)
Temp:
Selected
desired
Temp
Fan:
Any
Timer:
Any
I
FEEL: Any
Control
function
Protects the Outdoor coil from ice formation by controlling COMP & RV operation.
Scope
This new deicer is designed to operate at extreme temp conditions. The deicing cycle
could be triggered from:
1. OCT temp and time between two consecutive deicing cycles.
2. Detection of ice forming by change of the OCT temp.
Both algorithms adjust the time between deicing cycles to optimize the A/C
performance. The algorithm will automatically increase the time between deicing cycles
and reduce the deicing cycle as needed.
The algorithm uses EEPROM data to operate.
