Remq14Py1, 16Py1 (Multi 14, 16Hp) - Daikin VRV III REYQ8PY1 Service Manual

Refrigerant Circuit
1.5

REMQ14PY1, 16PY1 (Multi 14, 16HP)

No. in
refrigerant
Symbol
system
diagram
1 M1C Inverter compressor (INV)
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 Y3E
(Subcool: EVT)
Electronic expansion valve
8 Y2E
(Refrigerant charge EVJ)
9 Y6S Solenoid valve (Main bypass SVE)
10 Y5S Solenoid valve (Hot gas: SVP) Used to prevent the low pressure from transient falling.
Solenoid valve (Refrigerant
11 Y4S
regulator liquid pipe SVL)
Solenoid valve (Refrigerant
12 Y1S
regulator gas purging pipe SVG)
Solenoid valve (Refrigerant
13 Y7S regulator discharge pipe SVO) This is used to discharge refrigerant from the refrigerant regulator.
Solenoid valve (Discharge
14 Y8S
pipe of refrigerant regulator)
4 way valve (Heat exchanger
15 Y3S
switch 20SA)
4 way valve (Dual pressure
16 Y2S
gas pipe switch 20SB)
17 S1NPH High pressure sensor
18 S2NPL Low pressure sensor
HP pressure switch (For INV
19 S1PH
compressor)
HP pressure switch (For STD
20 S2PH
compressor 1)
HP pressure switch (For STD
21 S3PH
compressor 2)
Pressure regulating valve
22 —
(Liquid pipe)
Pressure regulating valve
23 —
(Refrigerant regulator)
24 — Subcooling heat exchanger
25 — Refrigerant regulator
26 — Capillary tube
27 — Capillary tube
28 — Capillary tube
29 — Capillary tube
30 R1T Thermistor (Outdoor air: Ta)
31 R8T Thermistor (Suction pipe: TsA) Used to detect suction pipe temperature.
32 R31T Thermistor (INV discharge pipe: Tdi)
33 R32T Thermistor (STD1 discharge pipe: Tds1)
34 R33T Thermistor (STD2 discharge pipe: Tds2)
Thermistor (Heat exchanger
35 R4T
deicer: Tb)
Thermistor (Heat exchanger
36 R2T
gas pipe Tg)
Thermistor (Heat exchanger
37 R7T
liquid pipe Tf)
Thermistor (Subcooling heat
38 R5T
exchanger gas pipe: Tsh)
Thermistor (Subcooling heat
39 R6T
exchanger liquid pipe Tl)
40 R9T Thermistor (Liquid pipe Tsc)
58
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 104~107.
Since the system is of air heat exchanging type, the fan is operated at 9-step rotation
speed by using the inverter.
Since the system is of air 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 air heat exchanger constant.
PI control is applied to keep the outlet superheated degree of subcooling heat
exchanger constant.
This is used to open/close refrigerant charge port.
This opens in cooling operation.
This is used to collect refrigerant to the refrigerant regulator.
This is used to collect refrigerant to the refrigerant regulator.
Bypass the high pressure gas to the refrigerant regulator.
This is used to switch outdoor heat exchanger to evaporator or condenser.
This is used to switch dual pressure gas pipe to high pressure or low pressure.
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.
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 judgments
on defrosting operation.
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.
This detects temperature of liquid pipe between the air heat exchanger and main
electronic expansion valve. Used to make judgments on the recover or discharge
refrigerants to the refrigerant regulator.
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 supercooled 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 liquid stop valve and subcooling
heat exchanger.
Major Function
Si37-701
Refrigerant Circuit