Daikin VRV EMERION REYQ-AATJA Service Manual page 182

Special Control
While in all-room cooling operation → All-room cooling/heating simultaneous operation
Dual pressure gas pipe
Suction gas pipe
Liquid
pipe
(1)
Cooling
Dual pressure gas pipe
Suction gas pipe
Liquid
pipe
(1)
Dual pressure gas pipe
Suction gas pipe
Liquid
pipe
(1)
Heating
While in all-room heating operation or cooling/heating simultaneous operation → All-room cooling
Dual pressure gas pipe
Suction gas pipe
Liquid
pipe
(1)
Heating
Dual pressure gas pipe
Suction gas pipe
Liquid
pipe
(1)
Vent
Dual pressure gas pipe
Suction gas pipe
Liquid
pipe
(1)
Cooling
175
(2) (3) (4) (5)
Cooling
Cooling Cooling
Cooling
(2) (3) (4) (5)
(2) (3) (4) (5)
Heating Heating Heating Heating
(2) (3) (4) (5)
Heating
Heating Heating
Heating
(2) (3) (4) (5)
Vent Vent
Vent
(2) (3) (4) (5)
Cooling Cooling Cooling Cooling
(1) All the indoor units in cooling 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
valves of branch selector unit.
 Required switching time: 30 seconds (switching
control time)
(While switching: The compressor stops operating.)
(4) Startup control
 Switching the dual pressure gas pipe from low
pressure to high pressure.
(5) Into heating operation or cooling and heating
simultaneous operation
Each indoor unit
 In warm air supply operation under cool air
prevention control (for 3 to 5 minutes).
(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
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
Vent
pressure to high pressure.
(5) Into all-unit cooling operation
 In cool air supply operation
SiUS372201EB
Part 4 Functions and Control