Outdoor Air Processing Unit Fxmq125~250Mfv1 - Daikin VRV II RXYQ5MY1B Service Manual

Refrigerant Circuit
1.4

Outdoor air processing unit FXMQ125~250MFV1

1.4.1 Refrigerant System
Th2
Distributor
Filter
Main Control Equipment
Code
∗
SH control: Superheated control of heat exchanger outlet
SC control: Subcooled control of heat exchanger outlet
Thermistor
Code
56
Heat exchanger
Fan
Th1
A
Filter
Electronic
expansion valve
Symbol
A Y1E Motorized valve
B Y1S Solenoid valve
C — Capillary tube
Symbol
Suction air temperature
Th1 R1T
thermistor
Liquid pipe temperature
Th2 R2T
thermistor
Gas pipe temperature
Th3 R3T
thermistor
Discharge air
Th4 R4T
temperature thermistor
Th4
Th3
Filter
Capillary
C
tube
Solenoid
B
valve
Check
valve
Name
Used to control the flow rate of refrigerant, and
make the SH control while in cooling or the SC
control while in heating.∗
Used to bypass hot gas while in heating with
thermostat OFF.
Used to reduce pressure from high to low in
bypassing hot gas.
Name
Used to turn ON or OFF the thermostat and select
cooling or heating operation.
Used to control the opening degree of EV (Y1F)
under the SC control.
Used to control the opening degree of EV (Y1E)
under the SH control.
Used to control the electric expansion valve
opening and thermostat ON/OFF so as to keep the
discharge air temperature at the set temperature.
SiE39-404
Gas pipe
connection port
Liquid pipe
connection port
4D018650B
Main function
Main function
Refirgerant Circuit