Heating Operation - Daikin VRV II RXYQ8MY1K Service Manual

Refrigerant Flow for Each Operation Mode

Heating Operation

"High temperature, high pressure gas"
"High temperature, high pressure liquid"
"Low temperature, low pressure"
Pressure regulating
50
Fan ON
" ON "
Heat exchanger
Fan
EV:Nomal
control
Filter Filter
Electronic expansion valve
Indoor unit
Thermostat "ON"
Heat exchanger
valve
(check valve type)
Electronic
expansion
valve
Check
valve
Solenoid
valve
Check
valve
High pressure
switch
Stop valve(with service port on on-site piping side φ 7.9 flare connection)
Indoor unit operation
Fan OFF
" OFF "
Heat exchanger
Fan
EV:224pls
Filter Filter
Electronic expansion valve
Indoor unit
Filter
pipe
Solenoid
Filter
valve
Check
valve
Solenoid
valve
Filter
Compressor
Gauge port
Low pressure
sensor
Fan LL
" ON "
Heat exchanger
Fan
EV:224pls
Filter Filter
Electronic expansion valve
Indoor unit
Thermostat "OFF"
Check
valve
Capillary tube
Fusible plug
Electronic expansion valve
Filter
Filter
4-way valve
High pressure
sensor
High
pressure
Check
switch
valve
Compressor
Refirgerant Circuit
Si39-502A