Heater / Air Conditioner Compartment And Controls - Komatsu 730E Operation & Maintenance Manual

Operation - Section 3
Page 3-16
HEATER / AIR CONDITIONER
COMPARTMENT AND CONTROLS
The heater/air conditioner compartment contains the
heater/air conditioner controls (6, Figure 3-1) and the
heater/air conditioner components, such as the
blower motor assembly and heater coils. Optimum
cab air climate can be selected by using the following
controls in various combinations.
DEFROSTER VENT CONTROL SWITCH
The defroster control switch (1, Figure 3-3) directs
heated air for windshield defrosting. "Down" position
of the toggle switch is Off. "Up" position of the toggle
switch is On.
OUTSIDE/INSIDE AIR CONTROL SWITCH
The outside/inside air control switch (2, Figure 3-3)
allows either outside or inside air to be circulated
through the cab heater assembly.
Moving the switch "Up" directs outside air to be circu-
lated through the heater assembly and through the
cab.
Moving the switch "Down" directs inside air to be
recirculated through the heater assembly.
HEAT VENT CONTROL SWITCH
The heater control (3, Figure 3-3) directs heated air
to the cab floor for heating of the cab. "Down" posi-
tion of the toggle switch is Off. "Up" position of the
toggle switch is On.
TEMPERATURE CONTROL KNOB
The Temperature control knob (4, Figure 3-3) is pro-
vided for the operator to select a comfortable temper-
ature.
Rotating the knob counter-clockwise (blue arrow) will
select cooler temperatures. Full counter-clockwise
position is the coldest air setting.
Rotating the knob clockwise (red arrow) will select
warmer temperatures. Full clockwise position is the
warmest heater setting.
FAN CONTROL KNOB
The fan control knob (5, Figure 3-3) is provided to
control the cab air fan motor. The fan motor is a 3-
speed motor (low, medium and high). Speeds are
selected by rotating the control knob clockwise to the
desired position. "Off" is full counter-clockwise posi-
tion.
Operator Cab and Controls
HEATER/AIR CONDITIONER SELECTOR SWITCH
The selector switch (6, Figure 3-3) allows the opera-
tor to select heat or air conditioning, or neither. The
left position of the switch activates the air condition-
ing and the right side of the switch activates the
heater. Neither the heat nor the air conditioning can
be activated in this position.
HEATER/AIR CONDITIONER VENTS
These heater/air conditioner vents (7, Figure 3-3)
may be rotated 360°. Air flow through the vents is
controlled by manually opening/closing or turning the
louvers.
FIGURE 3-3. A/C HEATER CONTROLS
OM3035.2 02/03