Lull 944E-42 Service Manual - Manual (Page 716)

Electrical System
9.206 Model 644E-42/944E-42 Rev. 6/04
9.13.11 Cab Heater/Air Conditioning Controls
Note: If the suspect component is found to be within the
heater box, the heater box must be removed as a
complete unit and replaced. Refer to Section 4.4.8,
“Heater/Defroster System.”
The cab heater and air conditioning
controls (1) are located in the lower bank of
switches on the right side of the dash. From left
to right the control panel consists of: a variable
speed fan control (2), an A/C on-off switch (3)
and a temperature control (4).
Control of air flow is made by opening, closing
or redirecting the air vent louvers in separate
locations inside the cab. For instance, if the
front glass needs rapid defrosting, redirect the
air flow at the front vents (directing the vent
louvers toward the glass) and close the remaining vents.
This will increase the volume of air flow to the front glass
and speed defrosting.
a. To heat the cab:
• turn A/C switch (5) to the OFF position,
• turn temperature control knob (6) to far right
position (RED = HOT),
• direct desired air flow by adjusting vent
louvers,
• turn fan control (7) to position “3” (8) to
assure rapid warm-up.
b. To defrost the cab:
• turn temperature control knob (7) to the
far right position (RED = HOT),
• direct desired air flow by adjusting vent
louvers,
• turn fan control (5) to position “3” (8) to
assure rapid defrost.
c. To cool the cab:
• turn A/C switch (6) to the ON position,
• turn temperature control knob (7) to the far
left position (BLUE = COOL),
• direct desired air flow by adjusting vent
louvers,
• turn fan control (5) to position “3” (8) to
assure rapid cool-down.
MU3480
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2
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OS1950
OS1960
OS1950
OA1390
OS1960
OU0930
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