The layout of the heater/air conditioning unit is
shown in the diagram which is viewed from the top
as fitted in the car. Fig. 1
Air is drawn by the fan either through the fresh air
intake located just ahead of the windshield, or
from the interior of the car dependent on the
position of the re-circulation flap. Air is then blown
by the fan through the air conditioning evaporator
to the temperature flap, the position of which
controls the proportion of air directed through the
heater matrix.
Two mode flaps mounted on a common spindle
then direct air to either the
footwell/screen
chamber, or to the door/face level vent chamber
(or both). The
footwell/screen
chamber is
incorporated in the L.H. end of the unit, and
contains a horizontally pivoted flap which directs
air either upwards to the screen vents, or
downwards to the footwell vents. The door/face
level vent chamber comprises of a separate
moulding fixed to the rear of the unit and contains
a horizontally
pivoted'
flap which either shuts off
the face level vents, or closes a bridging duct
connecting with the screen vent. Fig. 2
All flaps with the exception of the temperature flap
are vacuum operated via diaphragm activators.
The temperature flap is cable operated, direct from
the temperature control knob.
The
heater/air
conditioning selector switch has
two functions. One is to supply a vacuum to the
correct flap activator(s) whilst the other is to
supply an electric current to the compressor of
booster fan.
The vacuum distribution part of the control switch
consists of a spring loaded rubber labyrinth which
is rotated across five parts, connected by rubber
pipes to flaps in the heater/air conditioning unit.
Vacuum is supplied from the engine inlet manifold,
and stored in a reservoir located in the left hand
rear pontoon. A non-return valve in the supply line
to the
reservoir
ensures that a vacuum is
maintained when the engine is switched off.
ffB)
The connection and switching sequence of the
selector switch is as follows:
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