York R-410A, Technical & Service Manual, Page: 55 / 385

Outdoor
___________________________________________________________________________________
___________________________________________________________________________________
- 54 -
C. Low-pressure accumulator: In the partial load, the excrescent refrigerant will be storage in
this equipment and decrease the load and power input.
D. Four-way valve: It is only available for cooling and heating system and change the refrigerant
flow direction.
E. Check valve: It is only available in cooling mode to form a refrigerant loop.
F. Electronic expansion valve: It is only available in heating mode to control system’s
superheating and function as a capillary tube to decrease the refrigerant pressure and function
as throttle.
G. Electronic expansion valve: According to the capacity requirement of indoor unit adjust the
refrigerant flow volume.
H. High-pressure switch: Switches trip when preset pressure exceeds 3.3 +/-0.1MPa, thus
stopping operation.
L. Low-pressure switch: Switches trip when the suction pressure is lower than 0.15
+/-
0.1MPa,
thus stopping operation.
M. Oil separator: Device that collected oil discharged from the compressor and returns it to the
compressor via oil return capillary. Also function as reservoir for holding exceeds oil.
N. Oil return capillary: Function as a way for discharged oil return to the compressor.
O. Outdoor heat exchanger: Exchange the heat with outdoors ambient
P. Indoor heat exchanger: Exchange the heat with indoor ambient
Q. Muffle and Filter: Decrease the noise and avoid other things blocked the indoor unit EXV.