br>to automatically maintain that temperature. The system will automatically modulate the fan speed and
temperature of the discharged air to maintain the preset control temperature.


AUTOMATIC TEMPERATURE CONTROL PANEL

Keypad type buttons provide access to the various functions of the ATC system. The Mode Switch is
used to provide power to the AC and blower circuits, as well as select the vents through which the air
enters the passenger compartment: Defrost, Bi-Levels, Floor, Vent (Dash), Recirculation. All these
functions are explained in greater detail later.

TO USE THE AUTOMATIC TEMPERATURE (ATC) CONTROL SYSTEM, FOLLOW THESE SIMPLE
STEPS:

Turn the ATC System On. --With the vehicle running, place the Mode Switch in any position
other than OFF. Press the On/Off button to turn the system on.


Set the ATC System on AUTO or AUTO LO. --Press the keypad with either the large or small
word "AUTO" printed on it to set the system in AUTO or AUTO LO (small print). AUTO
positions automatically control every function of the ATC heating and cooling system to
maintain the preset temperature selected by the operator.



Note: When in AUTO LO, the maximum fan speed is slower than that in AUTO mode, and the slowest
speed is slower than the minimum attainable in AUTO mode. AUTO LO is generally used to reduce the
fan speed if the operator feels that the elevated air flow causes discomfort or too much noise.

Set the desired temperature. --Use the UP/DOWN ARROW keypads to select the temperature
from 60 to 86 degrees (F) that you would like to maintain inside the vehicle. Holding the
appropriate keypad down will cause the temperature to increase or decrease automatically.

As set above, the system will automatically reach and maintain the desired temperature year
round. You need only make changes if you want to modify the temperature (use Up/Down
Arrow buttons to do this) or to change the air discharge mode (mode switch).


IN ADDITION TO FULLY AUTOMATIC OPERATION, THE SYSTEM MAY BE SET AS FOLLOWS:

Full Heat Mode: --Pressing the UP arrow one more time after the display screen reads 86
0
F will
override the automatic feature of the ATC system and provide constant heat to the passenger
compartment. The display screen will read "HOT" when the system is set in the full heat mode. In this
mode, the blower fan will automatically switch to high (4) speed, but may be changed to suit the
operator's comfort by pressing the FAN keypad. To exit from full heat mode, press either AUTO keypad
or the DOWN arrow keypad.

Full Cool Mode: --Pressing the DOWN arrow one more time after the display screen reads 60
0
F will
override the automatic feature of the ATC system and provide constant cooling to the passenger
compartment. The display screen will read "AC" when the system is set in the full cool mode. In this
mode, the blower fan will automatically switch to high (4) speed, but may be changed to suit the
operator's comfort by pressing the FAN keypad. To exit from full cool mode, press either AUTO keypad
or the UP arrow keypad.

NOTE: Pressing the UP or Down arrow keypads will exit the system from full heat or cool modes, but
will not restore all automatic functions to the ATC system. To return to the fully automatic system the
operator must press one of AUTO keypads.

Fan Speed Control. --When the system is in the "AUTO" mode, it automatically varies the
fan speed from low to high. Should you choose to limit the speed of the blower fan, depress
the FAN keypad to place the blower in one of four desired speeds. Use of the manual fan
speed selection keypad will override the automatic fan speed selection of the ATC system, but
the rest of the ATC system will still operate automatically to maintain the preset temperature. Press either
AUTO keypad to return to automatic operation.

NOTE: Leaving the Fan Speed Control on a set blower speed will result in the air temperature cycling
back and forth from hot to cold, especially when the system reaches the set temperature point. 70% of
the automatic temperature modulation is done with airflow, which means that when the blower is locked
into a certain speed, the automated functions of the system will attempt to compensate for the loss of air
speed control by modulating the air temperature to maintain the set point temperature.

Manual AC Operation --Depress the AC keypad until the light next to the snowflake symbol
is lit. This locks the air conditioner in the "ON" position regardless of temperature conditions.
(However, the AC pressure safety switch will not allow the AC compressor to engage until
outside air temperatures are approximately 32
0
F or higher.) The rest of the system will
continue to operate automatically to maintain the preset temperature. Because the AC removes
moisture from the air, the AC "ON" mode is used to dehumidify cabin air which will help prevent windows
from fogging on rainy or humid days.

Press the AC keypad until the light beside the word "ECON" is lit. (On some models, the ECON symbol
has been replaced by ). The air conditioner is now disengaged and will not turn on even if cooling is
required. This permits the flow of outside air only (no AC) when cooling is required. The rest of the system will continue to operate automatically to maintain the preset temperature. Press either AUTO
keypad to return to automatic operation.

Outside Air Temperature -- Depressing the outside Air Temperature keypad will cause the
Control Module to momentarily display the outside air temperature. This does not affect the
system operation in any other way. The letter "E" will appear before the number on the
display screen to indicate that the outside temperature is being displayed.


AIR DIRECTION CONTROL

The key to optimal comfort and performance from your Automatic Temperature Control System is the
selection of the appropriate air direction. Air direction is selected by turning the Mode Switch to one of
the following positions:


DEFROST -- Outside air is drawn into the system and discharged through the defrost outlets.



MIX -- Outside air is drawn into the system and discharged through the floor and defrost
outlets.


FLOOR -- Outside air is drawn into the system and discharged through the floor outlets. In
some models a small amount of air is directed to the windshield for defrost.


BI-LEVEL -- Outside air is drawn into the system and discharged through the dash louvers,
floor, and defrost outlets.


VENT -- Outside air is drawn into the system and discharged through the dash louvers. For
enhanced passenger comfort, upper-level ventilation air is also discharged through the
defrost outlets.


PANEL -- Outside air is drawn into the system and discharged through the dash louvers.
These louvers can be adjusted for maximum comfort.


RECIRCULATION -- Air is drawn from the passenger compartment (Recirculated Air) and
discharged through the dash louvers. This position is used to provide maximum heating or
cooling, and is generally used during extremely hot or cold weather conditions. Because the
RECIRCULATION mode does not allow fresh "outside" air into the passenger compartment, it
may cause fogging of the windshield and stale air, when used for prolonged periods of
time. Switch to PANEL mode periodically if these conditions occur. RECIRCULATION
mode is recommended for initial cool-down or warm-up periods.

OTHER FEATURES

Sunload Sensor: -- The ATC 2000 automatic temperature control systems is also equipped with a sun
load sensor which is generally located on the upper dash shelf where it is continuously exposed to the
rays of the sun (or lack thereof). The sunload sensor will cause the operating temperature of the system
to vary ±1 to 2
0
F depending on the intensity of light being detected by the sensor.

Ice Warning: -- The display screen will blink once every ten seconds when the outside air temperature is
within ±6
0
F/ ±4
0
C of freezing (32
0
F/ 0
0
C). This feature indicates the possibility of icy road conditions,
and that care should be exercised while driving. It is only a warning and not an absolute indication of
road condition.

IMPORTANT OPERATING TIPS

Research has shown that most people are comfortable in a vehicle which is between 73
0
F/23
0
C and
80
0
F/27
0
C. You will probably also find that your ideal temperature varies with conditions, such as time of
day (day or night ) and sunload (heating effects of the sun). In general, it is best to select a slightly
warmer temperature at night than the temperature you find comfortable during the daytime. Experiment
with different temperatures until you find your ideal comfort zone.

OPTIONAL DUAL ZONE SYSTEMS

Units equipped with an optional passenger temperature controller allow the passenger
to adjust the temperature in the passenger seating area to their own personal comfort
level. The passenger side temperature control panel is located generally in the
passenger arm rest, or within easy reach of the passenger, and has two UP/DOWN
arrow keypads similar to those found in the operator control panel. The passenger can
adjust their seating area temperature by pressing either keypad to increase or
decrease the temperature that is preset on the operator control panel. LED lamps in
the passenger controlle