Reyq144Ptju - Daikin RXYQ96PYDN Service Manual

Refrigerant Circuit
2.2

REYQ144PTJU

No. in refrigerant
Symbol
system diagram
1 M1C Inverter compressor (INV1)
2 M2C Standard compressor 1 (INV2)
3 M1F Inverter fan
4 M2F Inverter fan
Y1E Electronic expansion valve
5(6)
(Y3E) (Main1 (Main2))
Y2E Electronic expansion valve
7(8)
(Y5E) (Subcool1 (Subcool2))
Electronic expansion valve
9 Y4E
(Refrigerant charge EVJ)
Y5S Solenoid valve (Main bypass1
10(11)
(Y10S) (Main bypass2))
12 Y4S Solenoid valve (Hot gas: SVP) Used to prevent the low pressure from reducing.
Solenoid valve (Refrigerant
13 Y3S
regulator liquid pipe SVL)
Solenoid valve (Refrigerant
14 Y1S
regulator gas purging pipe SVG)
Solenoid valve (Refrigerant
15 Y7S
regulator discharge pipe SVO)
Solenoid valve (Discharge
16 Y6S
pipe of refrigerant regulator)
Y2S 4 way valve (Heat exchanger
17(18)
(Y9S) switch 20SA)
4 way valve (Dual pressure
19 Y8S
gas pipe switch 20SB)
20 S1NPH High pressure sensor
21 S2NPL Low pressure sensor
S1PH HP pressure switch (For INV
22(23)
(S2PH) compressor)
Pressure regulating valve
24 —
(Liquid pipe)
Pressure regulating valve
25 —
(Refrigerant regulator)
26 — Subcooling heat exchanger
27 — Refrigerant regulator
28 — Capillary tube
29 — Capillary tube
30 R1T Thermistor (Outdoor air: Ta)
R8T
31(41) Thermistor (Suction pipe: TsA) Detects suction pipe temperature.
(R10T)
Thermistor (INV1 discharge
32 R31T
pipe: Tdi)
Thermistor (INV2 discharge
33 R32T
pipe: Tds1)
R4T Thermistor (Heat exchanger
35(45)
(R12T) deicer: Tb)
R2T Thermistor (Heat exchanger
36(46)
(R11T) gas pipe Tg)
R7T Thermistor (Heat exchanger
37(47)
(R15T) liquid pipe Tf)
R5T Thermistor (Subcooling heat
38(48)
(R13T) exchanger gas pipe: Tsh)
Thermistor (Subcooling heat
39 R6T
exchanger liquid pipe Tl)
R9T
40(50) (R14T) Thermistor (Liquid pipe Tsc)
130
Name
Inverter compressor is operated on frequencies between 52Hz and 266Hz by using
the inverter. The number of operating steps is as follows.
REYQ14P or 16P : 26 step
Since the system is of the outdoor unit heat exchanging type, the fan is operated at 9-
step rotation speed by using the inverter.
Since the system is of the outdoor unit heat exchanging type, the fan is operated at 9-
step rotation speed by using the inverter.
While in heating operation, PI control is applied to keep the outlet superheated
degree of the outdoor unit heat exchanger constant.
PI control is applied to keep the outlet superheated degree of subcooling heat
exchanger constant.
Used to open/close refrigerant charge port.
Opens in cooling operation.
Used to collect refrigerant to the refrigerant regulator.
Used to collect refrigerant to the refrigerant regulator.
Used to discharge refrigerant from the refrigerant regulator.
Bypass the high pressure gas to the refrigerant regulator.
Used to switch outdoor heat exchanger to evaporator or condenser.
Used to switch dual pressure gas pipe to high pressure or low pressure.
Detects high pressure.
Detects low pressure.
This functions when pressure increases to stop operation and avoid high pressure
increase in the
Used when pressure increases, to prevent any damage on components caused by
pressure increase in transport or storage.
Used when pressure increases, to prevent any damage on components caused by
pressure increase in transport or storage.
Apply subcooling to liquid refrigerant.
Surplus refrigerant is held according to the operation conditions.
Used to return the refrigerating oil separated through the oil separator to the INV
compressor.
Used to discharge refrigerant from the refrigerant regulator.
Used to detect outdoor temperature, correct discharge pipe temperature, and others.
Detects discharge pipe temperature. Used for compressor temperature protection
control.
Detects liquid pipe temperature of the outdoor unit heat exchanger. Used to make
judgments on defrosting operation.
Detects temperature of gas pipe for the outdoor unitheat exchanger. Used to exercise
the constant control of superheated degree when an evaporator is used for outdoor
unit heat exchanging.
Detects temperature of liquid pipe between the the outdoor unitheat exchanger and
main electronic expansion valve. Used to make judgments on the recover or
discharge refrigerants to the refrigerant regulator.
Detects temperature of gas pipe on the evaporator side for the subcooling heat
exchanger. Used to exercise the constant control of superheated degree at the outlet
of
subcooled
Detects temperature of liquid pipe between the main expansion valve and subcooling
heat exchanger.
Detects temperature of liquid pipe between the liquid stop valve and subcooling heat
exchanger.
Major Function
event of a fault.
heat exchanger.
SiUS34-801A_b
VRVIII R-410A Heat Recovery 60Hz