Komatsu 830E Shop Manual page 684

HEATER/AIR CONDITIONER CONTROLS
The heater assembly incorporates all the controls
necessary for regulating the cab interior temperature;
heated air during cold weather operation, outside air
during mild temperatures and cooled, de-humidified
air during warm weather operation.
The following information primarily describes the
heater system. Refer to Section M, "Air Conditioning
System" for detailed information concerning the com-
plete air conditioning system operation, repair, and
system recharging instructions.
OPERATION
Heat for the cab is provided by passing coolant from
the engine cooling system through a heater coil.
Blowers move air across the heating coil which
warms the air for heating or defrosting.
An engine driven freon compressor passes refriger-
ant through an evaporator coil mounted in the same
enclosure. The same blowers used for heating move
air across the evaporator to provide cooled air
through the outlet vents.
All heater and air conditioner controls are mounted
on a pod on the face of the enclosure. Refer to Fig-
ure 4-2 for the following:
• Defroster Switch (1): This is a 2-position toggle
switch; "down " is "OFF". "Up" provides air flow
through the defroster vents.
• Heat Vent Control Switch (2): This is a 2-position
toggle switch; "down " is "OFF". "Up" provides
heated air flow to the cab floor.
• Temperature Control Knob (3): This is a variable
rotary control.
counterclockwise (blue
increasingly cooler temperatures. Rotating the
knob clockwise (red arrow) selects increasingly
warmer temperatures.
• Fan Control (4); This is a 4-position rotary switch;
rotate knob to select off, low, medium, or high fan
speed.
• Heater/Air Conditioner Selector Switch (5): This
is a three position switch; the right position
activates the heater, the left position activates
the air conditioner, and the center position is
"OFF"
N4-2
Rotating the knob
arrow) will select
Operator Comfort
FIGURE 4-2. HEATER/AIR CONDITIONER
CONTROLS
1. Defroster Control
2. Heat Control
3. Temperature Control
4. Fan Control
5. Heater/Air Condi-
tioner Selector
6. Outlet Vents
N04023