Remq96, 120Pydn, Ptju (Multi 8, 10Ton) - Daikin RXYQ96PYDN Service Manual

Refrigerant Circuit
2.4

REMQ96, 120PYDN, PTJU (Multi 8, 10ton)

No. in refrigerant
Symbol
system diagram
1 M1C Inverter compressor (INV)
2 M2C Standard compressor 1 (STD1)
4 M1F Inverter fan
6 Y1E Electronic expansion valve (Main: EVM)
7 Y3E Electronic expansion valve (Subcool: EVT)
Electronic expansion valve (Refrigerant charge
8 Y2E
EVJ)
9 Y6S
Solenoid valve (Main bypass SVE)
10 Y5S Solenoid valve (Hot gas: SVP)
Solenoid valve (Refrigerant regulator liquid
11 Y4S
pipe SVL)
Solenoid valve (Refrigerant regulator gas purging
12 Y1S
pipe SVG)
Solenoid valve (Refrigerant regulator
13 Y7S
discharge pipe SVO)
Solenoid valve (Discharge pipe of refrigerant
14 Y8S
regulator)
15 Y3S 4-way valve (Heat exchanger switch 20SA)
4-way valve (Dual pressure gas pipe switch
16 Y2S
20SB)
S1NP
17 High pressure sensor
H
S2NP
18 Low pressure sensor
L
19 S1PH HP pressure switch (For INV compressor)
20 S2PH HP pressure switch (For STD compressor 1)
22 — Pressure regulating valve (Liquid pipe)
Pressure regulating valve (Refrigerant
23 —
regulator)
24 — Subcooling heat exchanger
25 — Refrigerant regulator
26 — Capillary tube
27 — Capillary tube
29 — Capillary tube
30 R1T Thermistor (Outdoor air: Ta)
31 R8T Thermistor (Suction pipe: TsA)
32 R31T Thermistor (INV discharge pipe: Tdi)
33 R32T Thermistor (STD1 discharge pipe: Tds1)
35 R4T Thermistor (Heat exchanger deicer: Tb)
36 R2T Thermistor (Heat exchanger gas pipe Tg)
37 R7T Thermistor (Heat exchanger liquid pipe Tf)
Thermistor (Subcooling heat exchanger gas
38 R5T
pipe: Tsh)
Thermistor (Subcooling heat exchanger liquid
39 R6T
pipe Tl)
40 R9T Thermistor (Liquid pipe Tsc)
134
Name
Inverter compressor is operated on frequencies between 52Hz and
210Hz 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 page 190.
Since the system is of
rotation speed by using the inverter.
While in heating operation, PI control is applied to keep the outlet
superheated degree of
PI control is applied to keep the outlet superheated degree of subcooling
heat exchanger constant.
Opens/closes refrigerant charge port.
Opens in cooling operation.
Prevents the low pressure from transient fallingreducing.
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.
Switches outdoor heat exchanger to evaporator or condenser.
Switches 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.
Appies subcooling to liquid refrigerant.
Surplus refrigerant is held according to the operation conditions.
Returns the refrigerating oil separated through the oil separator to the INV
compressor.
Returns the refrigerating oil separated through the oil separator to the STD1
compressor.
Discharges refrigerant from the refrigerant regulator.
Detects outdoor temperature, correct discharge pipe temperature, and
others.
Detects suction pipe temperature.
Detects discharge pipe temperature. Used for compressor temperature
protection control.
Detects liquid pipe temperature of
make judgments on defrosting operation.
Detects temperature of gas pipe for
exercise the constant control of superheated degree when an evaporator is
used for outdoor unit heat exchanging.
Detects temperature of liquid pipe between the
exchanger and main electronic expansion valve. Used to make judgments
on the recover or discharge refrigerants to the refrigerant regulator.
Detects gas pipe temperature on the evaporation side of 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.
Major Function
the outdoor unit
heat exchanging type, the fan is operated at 9-step
the outdoor unit heat exchanger constant.
the outdoor unit
heat exchanger. Used to
the outdoor unit
heat exchanger. Used to
the outdoor unit
VRVIII R-410A Heat Recovery 60Hz
SiUS34-801A_b
heat