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3. Display will show only the room temperature and scale. Use the
▲
or
▼
button to toggle between Fahrenheit (F) or Celsius (C).
4. Press the LIGHT button repeatedly until “DONE” is displayed.
TO CHANGE DIFFERENTIAL SETTING (d1)
The Aprilaire Thermostat is capable of adjusting the differential to change
how often the heating and cooling equipment will cycle on and off.
1. Place the MODE switch in the OFF mode.
2. Push and hold both of the temperature ADJUST buttons simultaneously
(
▲
and
▼
) until “ROOM” and “OFF” are no longer displayed.
3. Press the LIGHT button until “d1” is displayed.
4. Thermostat will display “d1” and a number 1, 2 or 3. The number indicates
the degrees from setpoint before a call for heating or cooling is made.
5. Use the
▲▼
buttons to select 1, 2 or 3 degrees.
6. Press the LIGHT button repeatedly until “DONE” is displayed.
TO CHANGE SECOND STAGE DIFFERENTIAL SETTING (d2)
(MODELS 8348 & 8366 ONLY)
This setting controls how far from the first stage differential setting the
temperature will be allowed to fall/rise before initiating second stage.
10
F
C
LIGHT
ADJUST
LIGHT
ADJUST
OR
ADJUST
MODE
Cool
•
Off
•
Heat
ADJUST
Press and Hold
Simultaneously
LIGHT