Rqyq14·16Py1B - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

Refrigerant Circuit
1.3 RQYQ14·16PY1B
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
(6) Y1E Electronic expansion valve (Main)
(7) Y2E Electronic expansion valve (Main 2)
Electronic expansion valve
(8) Y3E
(Subcooling)
(9) Y1S Solenoid valve (Hot gas)
(10) Y2S Solenoid valve (Bypass)
(11) Y3S Four way valve (Heat exchanger)
(12) Y4S Solenoid valve (Mixing unit inlet)
(13) Y5S Solenoid valve (Circuit of oil return)
Solenoid valve (Close liquid pipe for
(14) Y6S
stopped outdoor unit)
(15) Y7S Solenoid valve (Receiver liquid level)
(16) Y8S Solenoid valve (Receiver gas vent)
(17) Y9S Solenoid valve (Oil regulator outlet)
Solenoid valve (Refrigerant regulator
(18) Y10S
gas vent pipe)
Solenoid valve (Refrigerant regulator
(19) Y11S
liquid pipe)
Solenoid valve (Refrigerant regulator
(20) Y12S
gas pipe)
Solenoid valve (Refrigerant regulator
(21) Y13S
liquid outlet)
(22) S1NPH High pressure sensor
S2NPH High pressure sensor (Liquid pipe
(23)
outlet)
(24) S1NPL Low pressure sensor
(25) S1PH High pressure switch (For INV.)
(26) S2PH High pressure switch (For STD 1.)
(27) S3PH High pressure switch (For STD 2.)
(28) S4PH High pressure switch (for control)
(29) – Subcooling heat exchanger
(30) – Pipe heat exchanger (A)
(31) – Pipe heat exchanger (B)
(32) – Pipe heat exchanger (C)
(33) –
Fusible plug
(34) –
Pressure regulating valve 1 (Receiver
(35) –
- Discharge pipe)
Pressure regulating valve 2 (Liquid
(36) –
pipe - Receiver)
(37) R1T Thermistor (Outdoor air)
(38) R2T Thermistor (Receiver liquid level)
(39) R31T Thermistor (M1C discharge pipe)
(40) R32T Thermistor (M2C discharge pipe)
(41) R33T Thermistor (M3C discharge pipe)
Thermistor (Refrigerant regulator
(42) R4T
liquid pipe)
Thermistor (Subcooling heat
(43) R5T
exchanger outlet)
(44) R6T Thermistor (Liquid pipe)
(45) R7T Thermistor (Receiver gas vent outlet)
(46) R8T Thermistor (Suction pipe)
(47) R9T Thermistor (Heat exchanger deicer)
34
Name
Inverter compressor is operated on frequencies 52Hz to 210Hz by using
the inverter. Standard compressor is operated with commercial power
supply only. The number of operating steps is 49 when inverter
compressor is operated in combination with standard co
Because the system is an air heat exchange type, the fan is operated 8-
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.
Used to prevent the low pressure from transient falling.
Used to bypass the mixing unit during the normal operation.
Used to switch the operation mode between cooling and heating.
Use to adjust the amount of refrigeration oil and clean pipes during check
operation. Use to prevent refrigerant from flowing into the mixing unit
during normal operation.
Used to adjust the amount of oil in the mixing unit.
Used to prevent the accumulation of refrigerant in the non-operating
outdoor units in a multi-outdoor-unit system.
Used to detect the amount of refrigerant.
Used to collect refrigerant to the receiver.
Used to adjust the refrigeration oil during the check operation.
Used to collect refrigerant to the refrigerant regulator.
Used to collect refrigerant to the refrigerant regulator.
Used to discharge refrigerant from the refrigerant regulator.
Used to discharge refrigerant from the refrigerant regulator.
Used to detect high pressure.
Used to detect pressure of liquid pipe.
Used to detect low pressure.
In order to prevent the increase of high pressure when an error occurs, this
switch is activated at high pressure of 4.0 MPa or more to stop the
compressor operation.
In order to prevent the increase of field piping pressure when an error
occurs, this switch is activated at pressure of 3.3 MPa or more to stop the
compressor operation.
Apply subcooling to liquid refrigerant.
Heats the refrigerant that flows out of the receiver.
The fusible part fuses at a temperature of 70 to 75°C, allow pressure to
escape to the atmosphere. This is in order to prevent the pressure rise in
case of a fire or other abnormal heating.
Open at 4.0 MPa or more to avoid pressure increase to prevent damage to
functional parts by the pressure increase and to protect the field piping
during transportation and storage.
Open at 2 to 2.7 MPa or more to avoid pressure increase to prevent
damage to functional parts by the pressure increase and to protect the field
piping during transportation and storage.
Used to detect outdoor temperature, correct discharge pipe temperature
and others.
Used to detect the refrigerant temperature at the liquid level detection point
of the receiver.
Used to detect discharge pipe temperature. Used for compressor
temperature protection control.
Detects the liquid pipe temperature of the refrigerant regulator. Used
during adjustment of refrigerant amount.
Used to detect the gas pipe temperature on evaporation side of the
subcooling heat exchanger, keep the superheated degree at the
subcooling heat exchanger constant, and others.
Used to detect liquid pipe temperature. Used for purpose such as drift
prevention control between heating indoor and outdoor units in multi-
outdoor unit systems.
Used to detect the refrigerant temperature at the liquid level detection point
of the receiver.
Used to detect suction pipe temperature. Used for purpose such as control
for constant degree of suction superheat during heating.
Used to detect liquid pipe temperature of air heat exchanger. Used to
make judgements on defrosting operation.
Major Function
Refrigerant Circuit
SiBE341027