Lotus Esprit Series - Receiver-Drier; Expansion Valve; Temperature Control Switch

A I R ' C O N D I T I O N I N G
Page T5
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bnd condensing it into a high pressure liquid.
The construction of the condenser
is similar
to the engine
radiator but is designed to withstand hi
g
her pressures.
RECEIVER
- DRIER
Located in the front
c~mpartment on the right hand side its purpose is to ensure a supply
of liquid refrigerant to the expansion volve in an operational condition. A drier is
incorporated in the base of Receiver
- drier which absorbs any moisture that entered the
system during assembly.
Any foreign motter in the refrigerant will also be trapped ,in the
drier.
EXPANSION VALVE
$
The expansion valve is located at the side of the evaporator and thermostatically meters
the flow of
high pressure liquid refrigerant into the evaporator. The refrigerant supply is
controlled by a capillary tube stropped to the outlet pipe of the evaporator, as the
temperature changes at the outlet pipe so the refrigerant flow through the valve chan
g
es.
When liquid to the core of the evaporotor exceeds requirement the outlet temperature
drops, this
is sensed via the capillary tube, closing down the expansion valve and reducing
the flow of
liquid refrigerant. The expansion volve is pre - set internally and has no
external adjustment.
TEMPERATURE CONTROL SWITCH
d
The air conditioning temperature control switch is located on the right hand side of the
instrument binnacle. Turning the control clockwise to the required temperature position
-a%*
will engage the compressor clutch and drive the compressor. When the compressor is
running a red light (a light emitting diode above the temperature control switch)
is
illuminated.
The output from the temperature sensor in the evaporator
is compared by an electronic
comparator with the setting mode on the temperature control switch. When the temperoture
sensed
is greater than the setting, the compressor is engaged via the clutch and the red
light
is illuminated. The clutch will disengage when the ternperature is reached and the
red light will extin
g
uish.
The electronic comparator circuit
board is attached to the rear of the temperature control
ESPRIT
Issue 12/78