Triumph TR4A - Heating and Ventilation; System Operation and Controls

HEATING
AND
VENTILATION
IIEATING
AND
The heater is designed to heat and distribute incoming fresh air,
or if dust and exhaust fumes are being admitted, thc intake
duct
may be closed and
the heater
used
to recirculate air aheady in the
vehicle.
Fresh air is admitted to the heater duct tirough the open
scuttle ventilator, This is opened by pulling
t}le ventilator
leyer rearwards and closed by
pushing
it forwards.
When the scuttle ventilato! is closed, air
is
drawn
in tbrough
the open facia vents and recirculated by the heater unit, The
facia vents are opened by turning the handwheel, at
the side of
each
vent, forward.
When
the
scuttle ventilator is open,
cool fresh air is blown
out of the open facia vents and may be directed up or down,
or
may be cut-off by adjusting
the
handwhe€l.
There is no provision
for heatine the air blown from the facia vents.
Vf,NTILATION
The degree of heat given out by the heater unit is controlle
by the left-hand control on the
heater conhol panel. Pull
th
control fully out for
maximum
heat, or push it fully in for colc
Intermediate positions give varying degees
of heat,
The blower switch on the ccntre of the panel controls
motor-driyen
fan which
stimulates
the flow of fresh air fror
outside when the vehicle is stationarv. and boosts the air cftculs
tioo
when the vehicle is moving. The blower is operated b
pulling the control to switch on, and pushing it to switch of
The distribution of warmed air
is
effected
by
the right-han
control.
Pulling the contuol fully out directs air to the
intedc
of the vehicle. With the control pushed to the half
way
positior
air is dire€ted to the screen for demisting or defrosting. Inter
mediate
positions
direct ak to the screen and interior in varyin
proportions. With the control pushed fully home the system
j
inoDerative.
Fig. E
10