7
5
System Diagram
5.1
Gas-liquid Separator
Evapoarator
Cross-flow Fan
Main Capillary
Strainer
Check Valve
Assistant Capillary
Condenser
Compressor
Refrigenrant Flow Direction when Heating
Refrigenrant Flow Direction when Cooling
Circuit Diagram of Cooling / Heating System
When the power is on, indoor and outdoor units will start to run. When the system operates in
cooling mode, the compressor sucks low-temperature, low-pressure refrigerant gas from indoor
evaporator, compresses and then discharges high-temperature, high-pressure refrigerant gas into
outdoor heat exchanger. With the help of axial-flow fan, the gas transfers heat with environment
and becomes high-pressure refrigerant liquid. The liquid is throttled by the capillary and changes
into low-temperature and low-pressure liquid and then flows into indoor heat exchanger. With the
help of centrifugal fan, the liquid evaporates into low-temperature refrigerant gas and indoor air is
cooled down. The refrigerant gas is sucked into the compressor and the cycle introduced above
goes on and on, and the demanded low temperature environment is maintained. When the system
operates in heating mode, 4-way valve changes its way and the refrigerant flows into the reversible
cycle as the cooling mode. The refrigerant transfers heat in the indoor heat exchanger, and sucks
heat from outdoor heat exchanger and forms the heat pump cycle. This cycle goes on and on, and
the demanded high temperature environment is maintained.
