Doosan DX60R Shop Manual page 849

• Refrigerant (R134a) is compressed to approximately
2
15 kg/cm (210 psi) within the compressor.
• The compressed refrigerant flows into the condenser
at high temperature (approximately 80°C (176°F)).
• The refrigerant in the condenser is cooled to
approximately 60° by the condenser fan. At this time
the refrigerant changes from the gas to the liquid
state, even though the temperature has only been
reduced 20°C (68°F). (From 80° - 60°C (176° -
140°F)).
• The refrigerant in its liquid form is injected into the
evaporator through the expansion valve. At this time
the pressure is reduced by approximately 2 kg/cm
(28 psi) and the temperature is also reduced. As a
result, the refrigerant absorbs the heat from the air
surrounding the evaporator creating a cooling effect
and changes from the gas to the liquid state.
• The refrigerant once again flows into the compressor
in the gaseous state and the process is repeated.
Refrigerant gas is pressurized and sealed in the air-
conditioning system. Special precautions are required for
the proper recharging or release of refrigerant. Release of
refrigerant into the atmosphere is strictly regulated by law.
Make sure that you are in compliance with all mandated
federal, state and municipality requirements, before starting
any service or repair of the air conditioner. Refrigerant gas
used in the system must meet or exceed specifications for
R134a refrigerant,
environmentally mandated standard.
Electrical System
Shading Temperature
High
High
Low
High
Low
CAUTION
or any subsequently
Refrigerant State
High-pressure Gas
High-pressure Liquid
Low-pressure Liquid
High-pressure Gas/Liquid
Low-pressure Gas
2
issued
SP001687
Page 37