Sinclair OUTDOOR UNITS User Manual
SERVICE MANUAL
CASSETTE, FLOOR&CEILING, DUCT UNITS
DC INVERTER
SERIES
OUTDOOR UNITS
OUTDOOR AND INDOOR UNITS
8. Refrigeration System Principles
Refrigeration Cycle: The low-temperature and low-pressure refrigerant vapour in the evaporator is
compressed into high-temperature and high-pressure gas by the compressor, and then the gas enters
into condenser.The gas becomes high-temperature and high-pressure liquid through heat exchange with
outdoor air, and then the liquid passes through the capillary for cooling and decompression by throttling
and enters into evaporator.After that, the gas-liquid refrigerant in the envopator is completely evaporated
to cool the indoor air.The vapour out of the evaporator is re-compressed by the compressor. So is the
above procedure recycled that the cooled air in the duct is contiuously sent to air-conditioning area with
the help of fan motor.
Heating Cycle: It is
reverse to cooling cycleDŽIn this case, 4-way valve will reverse and flow direction of
refrigerant changes, i.e the vapour out of the compressor enters into heat exchanger for condensation.
The refrigerant after condensation passes through the capillary for throttling.After that it evaporates in
the outdoor heat exchanger, at last it will be sucked and compressed by compressor. So is the above
procedure recycled that the hot air in the duct is contiuously sent to air-conditioning area with the help of
fan motor.
Working Principle of the Unit:
Flow direction during cooling
Flow direction during heating
3-way Valve (gas valve)
Outdoor Unit
Indoor Unit
Connection pipe
(with insulating tube)
Gas-liquid separator
Compressor
Flare joint
Main Capillary
Connection pipe
(with insulating tube)
3-way Valve (liquidvalve)
(a) Working principle of cooling only unit
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