5.HVAC SYSTEM
5-1
5.HVAC SYSTEM
GENERAL INFORMATION - HVAC
HVAC SYSTEM
OVERVIEW AIR CONDITIONING
DESCRIPTION
In an air conditioning system heat is
removed from the cab by circulating R-134a
refrigerant through a closed system
containing five major components. At these
five points in the system the refrigerant
goes through pressure and temperature
changes.
The compressor takes in heated, low
pressure refrigerant gas through the
suction valve (low pressure side) and
pressurizes the heated refrigerant and
forces it through the discharge valve (high
pressure side) on the condenser. Should the
pressure on the high pressure side become
too high, the HPCO (High Pressure Cut-Out)
switch will cycle the compressor clutch off.
OVERVIEW AIR CONDITIONING·················5-1
AC SYSTEM............................................................5-3 5-1 5-1 5-2
HEATING SYSTEM···································· 5-10
AIR SUPPLY SYSTEM·································5-11
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