Instruction of the GMV D.C. Inverter
19
decrease of pressure and temperature. The liquid then enters the heat exchanger of the indoor unit and carries
out heat exchange with the room air to be regulated. The liquid then changes into low-temperature and low-
pressure gas. Such cycle repeats again and again to achieve the purpose of cooling. When the system turns
to heating operation, the 4-way reversing valve with solenoid coil shall be started to cause the heating cycle
follows an adverse course compared with the course of the cooling cycle. The refrigerant radiates heat in the
heat exchanger of the indoor unit (the electric heating component also starts operation and radiates heat) and
absorbs heat from the heat exchanger of the outdoor unit to carry out heat pump heating cycle for the purpose
of heating.
7.3 Cooling Only Type Digital Multi Variable Air-Conditioning Unit
Cooling
M
Receiver
Heat Exchange
Subcooling condenser
Capillary
Soleniod valve
Capillary
Oil seperator
High Pressure
Switch
Compresson
Low Pressure Switch
Gas-liquid separator
Cut off valve
Indoor
Outdoor
Operating Principle Diagram of Cooling Only Type Digital Multi-Connected Air-Conditioning Unit
Connect the system to power supply, and the indoor units and the outdoor unit shall start to operate.
When the system is in cooling operation, the low-temperature and low-pressure refrigerant gas from the
heat exchangers of the indoor units converge and is absorbed by the compressor to be compressed into high-
temperature and high-pressure gas. After that, the gas is discharged into the heat exchanger of the outdoor unit
for heat exchange with the air at the outdoor side, so the gas is changed into refrigerant liquid. The liquid ows
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