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T--326
There will be some applications where the switch mounting plate,
thermostat and fa n speed switch are mounted in the drivers area
without the contro l panel housing.
On other applications the vehicle manufacture r (OEM) will supply
different typecontrols for the air conditioning system. Refer to OEM
technical manual for operating instructions.
2.2.1 Fan Speed Switch (three speed or variable)
T urning t his s witch clockwise will energize the evaporator and
condenser fa n m otors. Th e c ompressor clutch will also be
energized if the thermostat calls fo r cooling (see thermostat control
operation).
Three Speed -- The standard fan speed switch has four settings,
Off (0), Low (1), Medium (2), and High (3) speed operation. This
switch controls the operation of the system and the evaporator
blower(s) by energizing the appropriate circuits and re lays located
on the electrical control panel.
Variable Speed -- Certain applications may be fitted with a variable
speed control switch instead of th e standard three speed switch.
This switch controls the speed of the evaporator motors by varying
the supply voltage.
2.2.2 Thermostat Control
The thermostat controls the temperature within the passenger
compartment by switching system components o n and of f.
Rotate the potentiometer switch knob to the right (clockwise) for
maximu m cooling. Rotate the potentiometer switch knob to the left
(counterclockwise) for less cooling.
2.3 DRIVER’S CONTROL PANEL -- FLORIDA (TEMPCON)
This control panel (See F igure 2-2 ) is normally used in school
buses locate dwithin the state of Florida, but not limitedto that area.
This contro ller is wired to an electrical control board.
The controller consists of:
a. ON/OFF Switch
b. Fan Speed Sw itch
c. Potentiometer
d. In--Line Fuse (Behind Controller)
2.3.1 ON/OFF Switch
Power is supplied to the controller, through an in--line fuse (see
Figure 2-3) from a 12 V DC ignition source originating from the
vehicle. The controller will not operate until the ignition switch is
acti vated.