Daikin REYQ-TA Series Service Manual page 100

Special Control
[While in all-room heating operation or cooling/heating simultaneous operation → All-room cooling]
Dual pressure gas pipe
Suction gas pipe
Dual pressure gas pipe
Suction gas pipe
Dual pressure gas pipe
Suction gas pipe
87
Liquid
pipe
Heating Heating
Heating
Liquid
pipe
Vent
Vent Vent
Liquid
pipe
Cooling Cooling Cooling
(1) In heating operation or cooling and heating
simultaneous operation
· Using the dual pressure gas pipe as a suction
gas pipe.
(2) Pump-down residual operation
(3) Pre-startup control
· Switching between the electronic expansion
Heating
Heating
valves of branch selector unit.
· Required switching time: 2 to 4 minutes
(switching control time)
(While switching: The compressor stops
operating.)
(4) Startup control
· Switching the dual pressure gas pipe from low
pressure to high pressure.
Vent
Vent
(5) Into all-unit cooling operation
· In cool air supply operation
Cooling Cooling
SiUS371614E
Functions and Control