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Refrigerant Circuit SiENBE37-704

64 Refrigerant Circuit

1.4 REMQ10PY1, 12PY1 (Multi 10, 12HP)

No. in

refrigerant

system

diagram

Symbol Name Major Function

1 M1C Inverter compressor (INV) Inverter compressor is operated on frequencies between 52Hz and 210Hz by using

(STD1)

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.

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.

7 Y3E

Electronic expansion valve

(Subcool: EVT)

PI control is applied to keep the outlet superheated degree of subcooling heat

exchanger constant.

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)

This is used to collect refrigerant to the refrigerant regulator.

13 Y7S

Solenoid valve (Refrigerant

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.

17 S1NPH High pressure sensor Used to detect high pressure.

18 S2NPL Low pressure sensor Used to detect low pressure.

19 S1PH

compressor 1)

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.

23 

Pressure regulating valve

(Refrigerant regulator)

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

by pressure increase in transport or storage.

24  Subcooling heat exchanger Apply subcooling to liquid refrigerant.

25  Refrigerant regulator Surplus refrigerant is held according to the operation conditions.

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

Thermistor (INV discharge

pipe: Tdi)

Used to detect discharge pipe temperature. Used for compressor temperature

protection control.

33 R32T

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 (Heat exchanger

liquid pipe Tf)

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

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

heat exchanger.