Daikin REMQ14PY1 Сервис мануал онлайн [77/491] 549043

Refrigerant Circuit SiENBE37-704

66 Refrigerant Circuit

1.5 REMQ14PY1, 16PY1 (Multi 14, 16HP)

No. in

refrigerant

system

diagram

Symbol Name Major Function

1 M1C Inverter compressor (INV)

3 M3C

Standard compressor 2 (STD2)

4 M1F Inverter fan

Since the system is of air heat exchanging type, the fan is operated at 9-step rotation

speed by using the inverter.

5 M2F Inverter fan

Since the system is of air heat exchanging type, the fan is operated at 9-step rotation

speed by using the inverter.

6 Y1E

Electronic expansion valve

(Main: EVM)

While in heating operation, PI control is applied to keep the outlet superheated degree

of air heat exchanger constant.

9 Y6S

Solenoid valve (Main bypass SVE)

This opens in cooling operation.

10 Y5S Solenoid valve (Hot gas: SVP) Used to prevent the low pressure from transient falling.

11 Y4S

Solenoid valve (Refrigerant

regulator liquid pipe SVL)

This is used to collect refrigerant to the refrigerant regulator.

12 Y1S

Solenoid valve (Refrigerant

regulator gas purging pipe SVG)

pipe of refrigerant regulator)

Bypass the high pressure gas to the refrigerant regulator.

15 Y3S

4 way valve (Heat exchanger

switch 20SA)

This is used to switch outdoor heat exchanger to evaporator or condenser.

16 Y2S

4 way valve (Dual pressure

gas pipe switch 20SB)

This is used to switch dual pressure gas pipe to high pressure or low pressure.

increase in the fault operation.

20 S2PH

HP pressure switch (For STD

compressor 1)

21 S3PH

HP pressure switch (For STD

compressor 2)

22 

Pressure regulating valve

(Liquid pipe)

This is used when pressure increases, to prevent any damage on components caused

by pressure increase in transport or storage.

Used to return the refrigerating oil separated through the oil separator to the INV compressor.

27  Capillary tube

Used to return the refrigerating oil separated through the oil separator to the STD1 compressor.

28  Capillary tube

Used to return the refrigerating oil separated through the oil separator to the STD2 compressor.

29  Capillary tube This is used to discharge refrigerant from the refrigerant regulator.

30 R1T Thermistor (Outdoor air: Ta) Used to detect outdoor temperature, correct discharge pipe temperature, and others.

31 R8T

Thermistor (Suction pipe: TsA)

Used to detect suction pipe temperature.

32 R31T

35 R4T

Thermistor (Heat exchanger

deicer: Tb)

Used to detect liquid pipe temperature of air heat exchanger. Used to make judgments

on defrosting operation.

36 R2T

Thermistor (Heat exchanger

gas pipe Tg)

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.

37 R7T

Thermistor (Subcooling heat

exchanger gas pipe: Tsh)

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.

39 R6T

Thermistor (Subcooling heat

exchanger liquid pipe Tl)

This detects temperature of liquid pipe between the main expansion valve and

subcooling heat exchanger.

40 R9T Thermistor (Liquid pipe Tsc)

This detects temperature of liquid pipe between the liquid stop valve and subcooling