Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 48 / 419

Refrigerant Circuit (Piping Diagrams) SiUS342004EB
41 Part 2 Refrigerant Circuit
Note(s)
1.4 Outdoor-Air Processing Unit
FXMQ48/72/96MFVJU*
 1. SH control: Superheating control of heat exchanger outlet
 2. SC control: Subcooling control of heat exchanger outlet
No. in piping
diagram
Electric symbol Name Function
(1) Y1E
Electronic expansion valve Used to control the flow rate of refrigerant, and make the SH
control (

1) while in cooling.
(2) Y1S
Solenoid valve Used to bypass hot gas while in heating with thermostat OFF.
Closed while in cooling.
(3) — Capillary tube Used to reduce pressure from high to low in bypassing hot gas.
(4) R1T Suction air thermistor Used to turn ON or OFF the thermostat.
(5) R2T
Liquid pipe thermistor Used to control the opening degree of electronic expansion valve
under the SC control (  2).
(6) R3T
Gas pipe thermistor Used to control the opening degree of electronic expansion valve
under the SH control.
(7) R4T
Discharge air thermistor Used to control the electronic expansion valve opening and
thermostat ON/OFF so as to keep the discharge air temperature
at the set temperature.
C: 4D01 8 650D
Heat exchanger
Distributor
Fan
Filter
Filter
Filter
Electronic
expansion valve
Capillary
tube
Solenoid
valve
Check
valve
Gas pipe
connection port
Liquid pipe
connection port
(5)
(7)
(6)
(3)
(2)
(1)
(4)