Rtsq14Py1, 16Py1 - Daikin RTSQ20PY1 Service Manual

SiBE31-801_C
1.3

RTSQ14PY1, 16PY1

No. in
refrigerant
Symbol
system
diagram
1 M1C Inverter compressor
2 M2C Standard compressor 1 (STD1)
3 M3C Standard compressor 2 (STD2)
4 M1F Inverter fan
5 M2F Inverter fan
Electronic expansion valve
6 Y1E
(Main: EVM)
Electronic expansion valve
7 Y2E
(Refrigerant charge: EVJ)
Electronic expansion valve
8 Y3E
(Subcooling: EVT)
Solenoid valve (Refrigerant
9 Y1S regulator gas purging pipe: SVG) Used to collect refrigerant to the refrigerant regulator.
Four way valve (Dual pressure
10 Y2S
gas pipe switch: 20SB)
Four way valve (Heat
11 Y3S
exchanger switch: 20SA)
Solenoid valve (Refrigerant
12 Y4S
regulator liquid pipe: SVL)
13 Y5S Solenoid valve (Hot gas: SVP) Used to prevent the low pressure from transient falling.
14 Y6S Solenoid valve (Main bypass: SVE) This opens in cooling operation.
Solenoid valve (Refrigerant
15 Y7S
regulator discharge pipe: SVO)
16 S1NPH High pressure sensor
17 S2NPL Low pressure sensor
High pressure switch (For
18 S1PH
INV. compressor)
High pressure switch (For
19 S2PH
STD compressor 1)
High pressure switch (For
20 S3PH
STD compressor 2)
Pressure regulating valve
21 —
(Liquid pipe)
Pressure regulating valve
22 —
(Refrigerant regulator)
23 — Subcooling heat exchanger
24 — Refrigerant regulator
25 — Capillary tube
26 — Capillary tube
27 — Capillary tube
28 — Capillary tube
29 R1T Thermistor (Outdoor air: Ta)
Thermistor (Heat exchanger
30 R2T
gas pipe: Tg)
31 R31T Thermistor (INV discharge pipe: Tdi)
32 R32T Thermistor (STD1 discharge pipe: Tds1)
33 R33T Thermistor (STD2 discharge pipe: Tds2)
Thermistor (Heat exchanger
34 R4T
deicer: Tb)
Thermistor (Subcooling heat
35 R5T
exchanger gas pipe: Tsh)
Thermistor (Subcooling heat
36 R6T
exchanger liquid pipe: Tl)
Thermistor (Heat exchanger
37 R7T
liquid pipe: Tf)
38 R8T Thermistor (Suction pipe: TsA) Used to detect suction pipe temperature.
39 R9T Thermistor (Liquid pipe: Tsc)
Refrigerant Circuit
Name
Inverter compressor is operated on frequencies between 52Hz and 266Hz 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.
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 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.
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 return the refrigerating oil separated through the oil separator to the STD2 compressor.
This is 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.
This 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 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
58