Rtsq10Py1, 12Py1 - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C
1.2

RTSQ10PY1, 12PY1

No. in
refrigerant
Symbol
system
diagram
1 M1C Inverter compressor
Standard compressor 1
2 M2C
(STD1)
3 M1F Inverter fan
Electronic expansion valve
4 Y1E
(Main: EVM)
Electronic expansion valve
5 Y2E
(Refrigerant charge: EVJ)
Electronic expansion valve
6 Y3E
(Subcooling: EVT)
Solenoid valve (Refrigerant
7 Y1S regulator gas purging pipe
SVG)
Four way valve (Dual pressure
8 Y2S
gas pipe switch: 20SB)
Four way valve (Heat
9 Y3S
exchanger switch: 20SA)
Solenoid valve (Refrigerant
10 Y4S
regulator liquid pipe: SVL)
11 Y5S Solenoid valve (Hot gas: SVP) Used to prevent the low pressure from transient falling.
12 Y6S Solenoid valve (Main bypass: SVE) This opens in cooling operation.
Solenoid valve (Refrigerant
13 Y7S
regulator discharge pipe: SVO)
Solenoid valve (Discharge pipe
14 Y8S
of refrigerant regulator: SVT)
15 S1NPH High pressure sensor
16 S2NPL Low pressure sensor
High pressure switch (For
17 S1PH
INV. compressor)
High pressure switch (For
18 S2PH
STD compressor 1)
Pressure regulating valve
19 —
(Liquid pipe)
Pressure regulating valve
20 —
(Refrigerant regulator)
21 — Subcooling heat exchanger
22 — Refrigerant regulator
23 — Capillary tube
24 — Capillary tube
25 — Capillary tube
26 R1T Thermistor (Outdoor air: Ta)
Thermistor (Heat exchanger
27 R2T
gas pipe: Tg)
Thermistor (INV. discharge
28 R31T
pipe: Tdi)
Thermistor (STD1 discharge
29 R32T
pipe: Tds1)
Thermistor (Heat exchanger
30 R4T
deicer: Tb)
Thermistor (Subcooling heat
31 R5T
exchanger gas pipe: Tsh)
Thermistor (Subcooling heat
32 R6T
exchanger liquid pipe: Tl)
Thermistor (Heat exchanger
33 R7T
liquid pipe: Tf)
34 R8T Thermistor (Suction pipe: TsA) Used to detect suction pipe temperature.
35 R9T Thermistor (Liquid pipe: Tsc)
Refrigerant Circuit
Name
Inverter compressor is operated on frequencies between 52Hz and 280(266 for
RTSQ12P)Hz by using the inverter, while Standard compressor is operated with
commercial power supply only. The number of operating steps is as follows when
Inverter compressor is operated in combination with Standard compressor.
Compressor operation steps : Refer to P.92~93.
Because the system is an air heat exchange type, the fan is operated at 9-step rotation
speed by using the inverter.
While the outdoor heat exchanger is evaporator, PI control is applied to keep the outlet
superheated degree of air heat exchanger constant.
Used to open/close refrigerant charge port.
PI control is applied to keep the outlet superheated degree of subcooling heat
exchanger constant.
Used to collect refrigerant to the refrigerant regulator.
Used to switch dual pressure gas pipe to high pressure or low pressure.
Used to switch outdoor heat exchanger to evaporator or condenser.
Used to collect refrigerant to the refrigerant regulator.
This is used to discharge refrigerant from the refrigerant regulator.
Bypass the high pressure gas to the refrigerant regulator.
Used to detect high pressure.
Used to detect low pressure.
This functions when pressure increases to stop operation and avoid high pressure
increase in the fault operation.
This is used when pressure increases, to prevent any damage on components caused
by pressure increase in transport or storage.
This is 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 return the refrigerating oil separated through the oil separator to the STD1
compressor.
Used to discharge refrigerant from the refrigerant regulator.
Used to detect outdoor temperature, correct discharge pipe temperature, and others.
This detects temperature of gas pipe for air heat exchanger. Used to exercise the
constant control of superheated degree when an evaporator is used for outdoor unit
heat exchanging.
Used to detect discharge pipe temperature. Used for compressor temperature
protection control.
Used to detect liquid pipe temperature of air heat exchanger. Used to make
judgements on defrosting operation.
Used to detect gas pipe temperature on the evaporation side of subcooling heat
exchanger. Used to exercise the constant control of superheated degree at the outlet
of subcooling heat exchanger.
This detects temperature of liquid pipe between the main expansion valve and
subcooling heat exchanger.
This detects temperature of liquid pipe between the air heat exchanger and main
electronic expansion valve. Used to make judgements on the recover or discharge
refrigerants to the refrigerant regulator.
This detects temperature of liquid pipe between the liquid stop valve and subcooling
heat exchanger.
Refrigerant Circuit
Major Function
56