New Holland T4.105F, Operator'S Manual

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3 - CONTROLS/INSTRUMENTS
Heating, ventilation or air-conditioning control
The air-conditioning system can supply either cool or
warm dehumidified air.
To use the system, proceed as follows.
NOTICE: When the engine is not running, the air condi-
tioner will not work because the compressor is driven by
the engine.
Starting
With the engine running and the electric fan ON, turn the
knob
(2) clockwise to start the air conditioner.
NOTE: Always switch the electric fan on before the air
conditioning. The air conditioning cannot work when the
electric fan is off.
After running for a few minutes, the inspection glass on
the top of the dehydrating filter should be clear and not
contain any bubbles.
If this does not occur, switch off the air-conditioning and
seek specialist help at your dealer.
Adjustment
For a correctly air conditioned cab, open the re-circulation
vents when the air conditioning is running, and keep the
doors, roof and rear window closed. To lower the tem-
perature in the cab and, at the same time, reduce the air
humidity, turn the knob
(3) counter-clockwise until the de-
sired temperature is obtained.
NOTICE: Before starting the engine, check that the air
conditioning is OFF.
NOTE: When working in very dusty environments, the
cab pressure may have to be increased to prevent dust
from entering the cab; it is also advised to close the re-cir-
culation vents.
If only the dehumidification function on the air conditioning
system is required, without lowering the air temperature,
turn the knob
(3) clockwise until the desired temperature
is obtained.
To restore the temperature in the cab after a prolonged
halt in the sun, start the tractor, switch on the air condi-
tioning and after about a minute open the rear fanlight or
the roof to let the hot air escape.
Stopping
Before stopping the engine, always turn the electric fan
knob
(1) and the air-conditioner knob (2) anticlockwise
into the OFF position.
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