Inverter Pre-Heat Operation - Daikin RXQ12AHR Service Manual

Special Control
7.3

Inverter Pre-Heat Operation

Inverter pre-heat function is performed by each compressor on its own.
HTdi : Value of inverter compressor discharge pipe temperature (Tdi) compensated with
outdoor air temperature
Ta : Outdoor air temperature
Teg : Low pressure equivalent saturation temperature (°C)
Tfin : Fin thermistor temperature
1) System is stopped (all compressors are stopped)
· Elapsing time after
power supply ON 6 hours
OR
· Own compressor HTdi Teg + 15
&
· Ta d 25°C
2) System is operating (at least one compressor is operating)
· Compressor is stopped ( )
&
· Own compressor HTdi Teg + 15
Represents the operating state of each compressor.
92
Power supply ON
Pre-heat OFF
Pre-heat ON
· Own Tfin 95°C
Pre-heat OFF
Pre-heat OFF
Pre-heat ON
· Own Tfin 78°C
Pre-heat OFF
· Elapsing time after
power supply ON
&
· Own compressor HTdi ! Teg + 20
OR
· Ta ! 26°C
· Own Tfin 85°C
· Compressor is operating ( )
OR
· Each compressor HTdi ! Teg + 20
· Own Tfin d 68°C
SiAF341904E
6 hours
Part 4 Functions and Control