Indoor Unit Fan Control - Daikin FCQ35B7V1 Service Manual

ESIE05-04
1.18

Indoor Unit Fan Control

Outline During compressor start and stop control, the indoor fan will receive instruction from the outdoor unit
in order to protect the compressor from receiving liquid and to assure a smooth compressor start up:
Before compressor After thermostat off or remote-controller signal off has been sent from the outdoor unit to the indoor
stop unit, the compressor will keep on running for a period of time in order to execute the "residual pump
down operation". During this pump down operation, the indoor fan will keep on operating.
Purpose:
Indoor cooling / Automatic
cooling
Indoor heating / Automatic
heating
Indoor drying
During compressor
stop
Indoor cooling / Automatic
cooling
Indoor heating / Automatic
heating
Indoor drying
Before compressor
startup
Indoor cooling / Automatic cooling
Indoor heating / Automatic heating
Indoor drying
Part 2 – Functional Description
Indoor fan control before compressor stop
Indoor fan control during compressor stop
Indoor fan control before compressor startup
Indoor fan control at compressor startup
Cooling: Minimize the remaining refrigerant amount in indoor unit heat exchanger
Heating: Lower the high pressure by avoiding high temperature build up around the indoor unit heat
exchanger.
Thermostat OFF
Remote controller OFF
Thermostat OFF
Remote controller OFF
Thermostat OFF
Remote conntrolle OFF
Thermostat OFF
Remote controller OFF
Thermostat OFF
Remote controller OFF
Thermostat OFF
Remote controller OFF
Remote controller setting
Functional concept
Indoor fan tap
L
LL
LL
LL
LL
LL
Indoor fan tap
Remote controller setting
OFF
LL
OFF
OFF
OFF
Indoor fan tap
OFF
L
2–23
1
2
3
4
5