Komatsu 830E-AC Shop Manual page 929

HEATER / AIR CONDITIONER
The heater/air conditioner assembly incorporates all
the controls necessary for regulating the cab interior
temperature; heated air during cold weather opera-
tion, and de-humidified, cool air during warm weather
operation.
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 refrigerant compressor passes
refrigerant 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 4-1 for the following:
Fan Control Knob
Knob (1, Figure 4-1) controls the cab air fan motor.
The fan motor is a 3-speed motor: low (setting 1),
medium (setting 2), and high (setting 3). Speeds are
selected by rotating the control knob clockwise to the
desired position. OFF is full counter-clockwise posi-
tion (setting 0).
Temperature Control Knob
Knob (2, Figure 4-1) allows the operator to select a
comfortable temperature.
• Rotating the knob counterclockwise (blue arrow)
will select cooler
counterclockwise position is the coldest air
setting.
• Rotating the knob clockwise (red arrow) will
select warmer temperatures. Full clockwise
position is the warmest heater setting.
Directional Control Knob
Knob (3, Figure 4-1) directs heated air to different
areas of the cab.
• The full counterclockwise position directs air to
the floor vents only.
• Turning the knob one position clockwise directs
air to both the floor and dash vents.
N04031 10/06
OPERATOR COMFORT
temperatures. Full
Operator Comfort
• Turning the knob one more position clockwise
directs air to the dash vents only.
• Turning the knob one more position clockwise
directs air to the windshield defrost vents only.
• The full clockwise position directs air to both the
floor and windshield defrost vents.
Heater Vents
Each heater/air conditioner vent (4, Figure 4-1) is a
flapper type which may be opened or closed or
rotated 360° for optimum air flow. There are four
(three not shown) across the top of the panel, one
each in the right and left panel modules, and four
below the panel.
NOTE: The air conditioner will not operate unless the
fan control knob is turned ON.
FIGURE 4-1. A/C & HEATER CONTROLS
1. Fan Speed
2. Temperature
3. Air Location
4. Air Vent
N4-3