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Step 4: Customizing the Thermostat
◆ Settings
System
Cool: The thermostat controls the cooling.
Off: The heating and cooling systems are off.
Heat: The thermostat controls the heat.
AUTO:The thermostat automatically selects heat or cool depending
on the temperature.
Fan
Auto:Equipment controls the fan.
On: The fan operates continuously.
Temperature
The default setpoint temperature for heating is 70°F (21°C), for cool-
ing is 78°F (25°C), and for auto is 72°F (22°C). After putting the sys-
tem switch in heat, cool, or auto, press either the ٚ or
ٙ
button to
adjust the temperature setting up or down.
The display will return to the current room temperature five seconds after
the last input and the new setpoint will be saved.
◆ Temperature Differential and Deadband
The temperature differential is factory set at 1°F (0.5°C) for the 1
ST
stage
differential and 2°F (1.0°C) for the 2
ND
stage. This means that whenever
the room temperature changes by one degree Fahrenheit from the tem-
perature setting, the system will turn on. If the system turns on too
often, increase the temperature differential.
The 2
ND
stage will turn on when the room temperature changes from the
desired temperature by the sum of the 1
ST
and 2
ND
stage differential set-
tings. The 2
ND
stage will also turn on if the temperature has not increased
(or decreased in the event of cooling) for a period of twenty minutes.
Although programmed at the same time as the temperature differentials,
the deadband is used only during the AUTO mode. In the AUTO mode, the
thermostat will automatically cycle either the heating or cooling system to
maintain optimal comfort. The deadband is the minimum allowable tem-
perature which must occur to switch to the opposite mode. For example, if
the deadband is set at 3°F and the setpoint is set at 70°F, the thermostat
will switch to cooling mode when the temperature reaches 73°F.
NOTE: IF THE TEMPERATURE LIMITING JUMPER J3 IS CUT
(FIGURE 7), THE DEADBAND IS NOT ADJUSTABLE AND IS
AUTOMATICALLY SET TO 6°F (3°C).
A
U
X
C
H
E
C
K
E
M
E
R
Figure 8