Triumph MAYFLOWER 1951, Instruction Book

Page: 68 / 86

67
RADIO AND HEATER— Instructions
HEATING AND VENTILATING SYSTEM
Fresh air can be used in this system for both heating and ventilation by opening the scuttle
ventilator (see page 8). With the ventilator shut the system can be used for heating only
and, instead of using fresh air, recirculates the air already inside the car.
Fresh air from the forward facing scuttle ventilator is fed to a Heating / Ventilating Set,
comprising a booster and a separate heater unit, and then via a distributing duct or baffle
into the car near the driver's and front passenger's feet, and also via flexible pipes to the
windscreen nozzles. The blower and heater units are controlled by two quadrant type
controls marked "DEMIST & DEFROST" and "VENTILATION" respectively, together
with a pull-push "ON/OFF" switch on the facia panel for the electrically driven centrifugal
blower, these controls are located as shown in Figs. 2 and 39. The blower switch will only
operate when the ignition is switched on.
Notes on Operation of System.
If it is desired not to use the system either as a heater or a ventilator, then blower
switch should be put to "OFF" position and both control knobs moved as far as
possible to "OFF" position—no appreciable quantity of air will then enter the car
via this system.
If it is desired to use ventilating air only then the ventilation control knob should be
moved to "COLD" position—the blower should only be switched on if it is desired
to boost the ventilating air supply.
Above speeds of about 25-30 m.p.h. the air supply due to vehicle movement and the
forward facing fresh air intake will probably produce all the air required—at lower
speeds or if it is desired to boost the supply, the blower should be switched on.
If heating is required, either on the screen or in the vehicle generally, the
appropriate control knob should be moved accordingly. The Demist position gives
cold air on screen and the Defrost position gives hot air on screen. The degree of
heating required can be controlled to suit individual preference according to the
position selected for the control knobs.
For completely
unheated air, however, control knob must be in the "DEMIST" and
"COLD" positions respectively.
If it is desired to use all the air supply for the screen with none to the passengers'
feet, or vice versa, this can be done by moving the appropriate knob to the desired
position and moving the other knob to the "OFF" position.