12a-7
CONTROL SYSTEM
Revision 0
12Α.4.4. HE operation
• Minimum Heaters ON or OFF time is 30 sec.
• Heaters can never be in operation while IFAN is OFF.
• In RH group, HE-1 will be activated only when COMP is not operating except in Dry
Mode.
12Α.1.5. Protections
• High-pressure protection is applicable to all operating modes.
• Deicing control is valid in Heat and Auto Heat Mode only.
• Defrosting control is valid in Dry, Cool and Auto Modes.
• No reset after protection modes.
12Α.1.6. Thermistors operation
• Return air Temp is detected by RAT (RT1) in normal Mode, or by RCT (R/C sensor) in I-
FEEL Mode.
• ICT (RT2) detects indoor Coil Temp.
• Outdoor Coil Temp is detected by OCT (RT3).
• Definition of thermistor faults:
a. Thermistor is disconnected -
The thermistor reading is below -30
o
c.
b. Thermistor is shorted -
The thermistor reading is over 75
o
c.
c. Thermistor Temp reading doesn’t change (irrelevant for RT1) -
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