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Operation - Section 3
Page 3-26
HEATER/AIR CONDITIONER
(FIGURE 3-7)
(60) Fan
The fan switch controls the
heater/air condition three-speed
blower motor. The speeds are High,
Medium, and Low.
(61) Temperature Control Knob
The push/pull knob controls the amount of hot water
that will flow through the heater core to heat the air as
it passes through the core and circulates throughout
the cab.
(62) Louvers
The louvers can be rotated or adjusted to direct the
flow of air to any part of the cab for the operator's
comfort.
(63) Heater/Air Conditioner
Switch
The heater/air conditioner switch is a three-position
toggle switch. When the switch is moved to the "Heat"
position, the blower motor is "On" and can be control-
led by the three-position fan switch (60).
If the switch is moved to the air conditioning position,
the compressor magnetic clutch is turned "On" and the
compressor will deliver refrigerant to the evaporator
coil in the heater/air conditioner unit in the cab.
(64) Air Conditioning Temperature
Control
The thermostatic switch controls
the temperature of the air entering
the truck cab. The control is set by
the operator as desired.
Instrument Panel and Controls
FIGURE 3-7. HEATER/AIR CONDITIONER
(65) Inside/Outside Air Control Knob
The inside/outside air control knob is connected to a
vent, which allows either outside or inside air to be
circulated through the heater assembly.
Pulling the knob out permits inside air to be recirculated
through the heater. Pushing the knob all the way in
permits outside air to be circulated through the heater
assembly.
OM3012.3
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