Receiver Unit; Evaporator Unit; Expansion Valve; Expansion Valve And Liquid Sight Glass - Lincoln Continental 1964 Shop Manual

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PART
16-3
16-13
AIR CONDITIONING
Section Page
Section Page
1 Description and Operation ........ 16-13
3 Removal and Installation ................. 16-16
2 In-Car Adjustments and Repairs. . . . ....... 16-14
D
DESCRIPTION AND OPERATION
The combined heater-air condi-
tioner incorporates two control levers.
The regulator lever controls both
heating and cooling temperature and
ventilation quantity, from minimum
to maximum. The vents-heater lever
controls the air duct doors for fresh
air, heated air, defrosting, cooled
recirculated air, and cooled fresh air.
The cooled fresh air is part recircu-
lated and part fresh. A 4-position
blower control switch is used to give
three blower speeds for low, medium
and high volumes of air for heating,
defrosting, and cooling. Fig. 1 shows
the heater-air conditioner installation.
Some air is bled by the defrost
doors and the toe-board heat door
when they are in their closed posi-
tions.
A wiring diagram covering both
heating and air conditioning is shown
(Fig. 13) at the end of this part of
the manual.
RECEIVER UNIT
The air cooling system stores the
liquid Refrigerant-12 under pressure
in a combination receiver and dehy-
drator. The pressure in the receiver
normally varies from about 80 to
300 psi, depending on the surround-
ing air temperature and compressor
speed. The receiver and condenser
comes charged and marked with the
total weight, so that any leak, indi-
cated by a loss in weight, can be
detected before assembly.
The dehydrator removes any traces
of moisture that may have accumu-
lated in the system. Even small
amounts of moisture will cause an
air cooling unit to malfunction. A
fusible plug is screwed into the re-
ceiver. This will release the refriger-
ant before the refrigerant tempera-
tur~
exceeds 212
o
F.
EVAPORATOR UNIT
When the cooling system is in op-
eration, the liquid Refrigerant-12
flows from the combination receiver
and dehydrator unit through a flex-
FIG.
1-Heater-Air Conditioner Installed
ible hose to the evaporator (cooling
unit) where it is allowed to evapo-
rate at a reduced pressure. The evap-
orator assembly is mounted on the
passenger compartment side of the
dash.
EXPANSION VALVE
The rate of refrigerant evapora-
tion is controlled by an expansion
valve (Fig. 2) which allows only
enough refrigerant to flow into the
evaporator to keep the evaporator
operating efficiently, depending on its
heat load.
The expansion valve consists of
the valve and a temperature sensing
capillary tube and bulb. The bulb
is clamped to the outlet pipe of the
evaporator. Thus, the valve is con-
trolled by evaporator outlet tempera-
ture. An internal equalizer applies
evaporator outlet pressure to one side
of the valve diaphragm. Thus, the
valve is controlled by both evap-
DOOR
AIR OUTLET REGISTER
HEATER THERMOSTAT
K1368-B
orator outlet temperature and outlet
pressure.
The restricting effect of the expan-
sion valve at the evaporator causes a
low pressure on the low pressure side
of the system of 12-50 psi, depending
on the surrounding air temperature
and compressor speed.
FIG.
2-Expansion Valve
and Liquid Sight Glass