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2
16-7
PART
16-2
AIR CONDITIONING
Description
and
Operation
Diagnosis and Testing ... . ..
Controls position and operation
Sight glass
...
... .
..
Magnetic clutch test
Receiver dryer test
Compressor
seal
leak
test
Refrigerant leaks
Compressor
oil
level
check
...
Safety Precautions
... . ..
16- 7
16-
9
16-11
16-15
16-15
16-15
16-15
16-18
16-18
16-19
3
4
Adjustments
... ... .
..
Discharging the system
Evacuation
...
Recharging
..
.
. .. .. .
. ..
Major Repairs
... ... . ..
Removal
&
installation
...
Compressor
Clutch
bearing ..
.. .
.
..
Specifications ...
... .
..
Operating instructions ...
16-20
16-20
16-20
16-20
16-22
16-22
16-22
16-24
16-25
16-25
D
DESCRIPTION AND OPERATION
DESCRIPTION
The Air Conditioning System is a
combined heater-cooler unit located
in the forward part of the automobile.
Functionally, the unit is a normal
mechanical
refrigeration
system,
combining the primary components
of a compressor, condenser receiver,
expansion valve and evaporator. In
addition, a magnetic clutch belt
driven from the engine crank, is used
for the compressor
drive.
Basically, the capacity of any air
conditioning
system,
be it in a build-
ing or in a car, should be such that
inside conditions are
maintained
within the normal "comfort zone"
CAPILLARY
TUBE
EXPANSION VALVE
•
HIGH. PRESSURE LIQUID
tal
LOW
.
PRESSURE LIQUID
•
HIGH. PRESSURE VAPOR
f/lA
LOW. PRESSURE VAPOR
FIG.
1.
Refrigerant Cycle
This zone ranges in temperature from
70 to 9Q•F and in relative humidity
from 30% to 70%
.
Outside conditions
determine the actual recommended
inside
conditions.
The heater unit is functionally the
same as described in Part 16-1.
OPERATION
(a)
REFRIGERANTCYCLE
The refrigerant cycle is as follows:
Low pressure, low temperature gas
from the evaporator enters the com-
pressor at the suction valve. In the
compressor the gas is raised to a high
temperature and
pressure.
Superheat
is added to the gas due to heat of
compression and mechanical
heat.
From the compresf,or, the gas en-
ters the condensor where the super-
heat is first removed and the charge
is condensed to the liquid state (still
at high pressure)
.
Leaving the condensor, the high
pressure liquid passes to the receiver
then to the expansion valve. At this
point,
the throttling action of the ex-
pansion valve reduces the liquid to
a low temperature and pressure
where it enters the evaporator.
In the
evaporator,
the liquid boils
until the charge is entirely vapour-
ised
,
then returns to the compressor.
COMPRESSOR
CONDENSER
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