Daikin RZQ Series FCQ20EVA Service Manual page 42

Function Details
4.2.3 Crankcase Heater Control (Except RZQ50/60/71KCVLT)
After the compressor has been turned OFF, the crankcase heater control will be activated in order to avoid
refrigerant from dissolving in the compressor oil.
[Ending Condition]
• Discharge pipe temperature ≥ 75ºC
• Thermostat ON
4.2.4 Preheating Operation Control
Only for RZQ20/24LVA
Outline
After the compressor has been turned OFF, the preheating operation will be activated in order to avoid
refrigerant from dissolving in the compressor oil.
Trigger conditions
Starting conditions
Ending conditions
33
ON
70˚C
• Power supply ON to first operation
• OR
• 60 minutes or more elapsed after compressor stop
&
• Discharge pipe temperature < 40°C
• Outdoor air temperature < 40°C
• Discharge pipe temperature > 43°C
OR
• Outdoor air temperature > 43°C
• Thermostat ON confirmation
OFF
75˚C
Discharge pipe temperature
SiME281501E
Function and Control