Basic Control; Normal Operation - Daikin RXSQ24TAVJU Service Manual

Basic Control

2. Basic Control
2.1

Normal Operation

Cooling Operation
Outdoor unit actuator
Compressor
Outdoor fan
Four way valve
Main electronic
expansion valve
Subcooling electronic
expansion valve
Hot gas bypass valve
Injection valve
Heating Operation
Outdoor unit actuator
Compressor
Outdoor fan
Four way valve
Main electronic
expansion valve
Subcooling electronic
expansion valve
Hot gas bypass valve
Injection valve
Heating operation is not functional at an outdoor air temperature of 24°CDB (75°FDB) or more.
41
Electric symbol
24/36 class 48 class 60 class
M1C M1C
M1F M1F M1F, M2F Cooling fan control
Y1S Y1S
Y1E Y1E
 

Y2S
Y3S Y3S
Electric symbol
24/36 class 48 class 60 class
M1C M1C
M1F M1F M1F, M2F STEP 7 or 8
Y1S Y1S
Y1E Y1E
 

Y2S
Y3S Y3S
Operation
M1C Compressor PI control
Y1S OFF
480 pulse (Fully open) 
Y1E
Y3E PI control

OFF

OFF
Operation
M1C Compressor PI control
Y1S ON
Y1E PI control
Y3E PI control

OFF

OFF
SiUS331708EA
Remarks
Used for high pressure protection control,
low pressure protection control, discharge
pipe temperature protection control, and
compressor operating frequency upper
limit control with inverter protection
control.



This valve turns on with low pressure
protection control.
This valve turns on with high discharge
temperature protection control.
Remarks
Used for high pressure protection control,
low pressure protection control, discharge
pipe temperature protection control, and
compressor operating frequency upper
limit control with inverter protection
control.




This valve turns on with low pressure
protection control.
This valve turns on with high discharge
temperature protection control.
Functions and Control