ESIE13-01
1.5
Piping Diagram and Functional Parts Layout
RXYQ14,16,18,20T7Y1B
No.
Name Part
Wiring Symbol
Major Function
1
Inverter driven compressors
M1,2C
Inverter driven compressors are operated in multi-steps according to Te for cooling, Tc for heating.
2
INV fan
M1,2F
When outdoor coil is condensor, the fan is operated in 8 steps to maintain minimum Tc.
3
Expansion valve for outdoor coil
Y1E
In cooling: fully open when compressor operation. In heating operation: PI control to keep the superheat constant.
4
Expansion valve for sub cool heat exchanger
Y2E
Used to control outlet super heat on sub cool heat exchanger.
5
Solenoid valve oil return from oil separator
Y3S, Y4S
Used to control amount of returned oil from the oil separator to the compressor.
6
Solenoid valve oil return from accumulator
Y2S
Used to return oil from the accumulator to the compressor.
7
4 way valve indoor side
Y1S
Used to switch the operation mode between cooling and heating.
8
Suction accumulator
9
HP sensor
Used to detect discharge pressure. In cooling mainly used to control fan speed S1NPH outdoor. In heating mode mainly used for compressor capacity control.
10
LP sensor
S1NPL Used to detect suction pressure. In cooling mainly used to control compressor capacity. In heating mode to enable to calculate suction superheat.
11
High pressure switch
S1PH, S2PH
12
Pressure regulating valve
—
This valve opens at a pressure of 4.0MPa for prevention of pressure increase, thus resulting in no damage of functional parts due to the increase of pressure in transportation or storage.
13
Subcooling heat exchanger
—
Used to subcool liquid refrigerant.
14
Capillary tube
—
Used to return the refrigerating oil separated through the oil separator to the compressor.
15
Thermistor air
R1T
Detects outdoor ambient temperature. Mainly used to correct discharge pipe temperature, and defrosting condition.
16
Thermistor discharge
17
—
Used to avoid liquid back to the compressor (upper area) while also storage of refrigerant not required to circulate at current capacity step.
In order to prevent the increase of high pressure when a malfunction occurs. This pressure switch opens over 4.0MPa or more to stop the compressor operation.
R21T, R22T
Detects discharge pipe temperature. Mainly used for discharge temperature protection of compressor.
Thermistor accumulator inlet
R3T
Detects the gas inlet temperature of the accumulator. Mainly used to keep the suction superheated degree constant in heating operation.
18
Thermistor main liquid pipe to outdoor coil
R4T
Detects liquid pipe temperature of heat exchanger, determine subcool during autocharge, test run and leak test, overcharge during test run.
19
Thermistor main liquid to indoor coil
R5T
Detects liquid pipe temperature. Mainly used to judge effect of liquid subcool circuit during test run and leak test.
20
Thermistor subcooling heat exchanger gas pipe
R6T
Detects gas pipe temperature on the evaporation side of subcooling heat exchanger, keep the superheated degree at the outlet of subcooling heat exchanger constant.
21
Thermistor heat exchanger deicer
R7T
Detects liquid pipe temperature of air heat exchanger, determine start and end defrost operation.
22
Thermistor compressor surface
R8T
Detects compressor surface temperature, this switch is activated at surface temperature of 120 deg. or more to stop the compressor operation (only for RYYX10,12T).
23
Cooling plate
Refrigerant Circuit
—
Used to cool plate of switch box by refrigerant.
38