Carrier T-326 - Manual (Page 13)

11 T--326
Move the ON/OFF switch to the ON position. A green light will
illuminate indicating that the controller has power. At the same time
the evaporator fans will operate in either Low, Medium or High
speed, depending on the Fan Speed switch location.
1
2
3
4
5
1 Face Plate
2 Green Light
3 Rocker Switch, 2 Position, ON/OFF
4 Rocker Switch, 3 Position, LOW--MED--HIGH
5 Thermostat Control (Potentiometer)
Figure 2-2 Switch Assembly (TEMPCON)
2.3.2 Fan Speed Switch -- 3 Speed
The evaporator fan speeds can be adjusted by pushing the rocker
switch to the desired position:
a. H = High Speed
b. M = Medium Speed
c. L = Low Speed
When the evaporator fan speed switch is positioned at the desired
speed, a signal is sent to the corresponding fan speed relay located
on the electrical circuit board.
2.3.3 Thermostat Control
The thermostat control potentiometer has an operating range of 60
to 85 degrees F.
Rotate the potentiometer switch knob to the right (clockwise) for
maximum cooling. Rotate the potentiometer switch knob to the left
(counterclockwise) for less cooling.