Daikin RXYQ96PYDN Service Manual page 34

SiUS34-801A_b
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) Prevents the low pressure from transient falling.
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) (R10T) Thermistor (Suction pipe: TsA) Detects suction pipe temperature.
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) Thermistor (Liquid pipe Tsc)
(R14T)
VRVIII R-410A Heat Pump 60Hz
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.
Opens/closes refrigerant charge port.
Opens in cooling operation.
Collects refrigerant to the refrigerant regulator.
Collects refrigerant to the refrigerant regulator.
Discharges refrigerant from the refrigerant regulator.
Bypasses 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.
Functions when pressure increases to stop operation and avoid high pressure increase in
the event of a fault.
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.
Applies 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.
Discharges refrigerant from the refrigerant regulator.
Detects 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 unit heat 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 unit heat 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
heat exchanger.
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.
Refrigerant Circuit
19