Operation Mode - Daikin ERQ Service Manual

Operation Mode

1. Operation Mode

Operation in
stop mode
AHU stop or
thermostat OFF
equalization
prior to startup
Startup control
• Cooling startup
control
• Heating startup
control
Normal operation
• Compressor PI control
• Electronic expansion
valve PI control
• Protection control
Cooling or heating
Oil return IN
conditions are met.
Defrost IN
conditions are met.
Operation
mode change
22
AHU thermostat ON
Malfunction/Standby
Pressure
AHU stop or
thermostat OFF
AHU thermostat ON
Malfunction/Standby
operation
Yes
No
Yes
No
Yes
No
Restart standby
(Compressor stop)
Pump-down
operation
AHU stop or
thermostat OFF
Malfunction/
Standby
Oil return operation
Defrosting operation
Note:
In the AHU stops or the thermostat
turns OFF while in oil return operation or
defrosting operation, pump-down residual
operation is performed on completion of the oil
return operation or defrosting operation.
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ESIE09-05
Malfunction/
Standby
residual
(V3152)
Function