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CT3451 PROGRAMMABLE THERMOSTAT
69-1620—1 6
Fig. 13. Installing batteries.
Restore power to the heating/cooling system.
8 CUSTOMIZE YOUR THERMOSTAT
Your Honeywell thermostat comes preset to the most
commonly used settings:
Temperature (°F).
Gas or oil forced air furnace.
Aggressive algorithm control.
You can change these settings using the instructions that
follow. To exit at any time, press the key until End
displays.
Setting °F/°C Indication, Heat Cycle Rate,
Heating/Cooling Temperature Control
The following instructions provide information to change
the heating cycle rate to match the heating equipment
and to choose either the Fahrenheit (°F) or Celsius (°C)
display.
NOTE: All four steps must be completed to save
changes to the °F/°C indication and the heat
cycle rate.
Enter Installer Setup.
Use or keys to set the temperature setpoint
to 52°F (11°C).
Press and keys simultaneously for more
than two seconds to enter Installer Setup.
Release the keys to display the three-digit soft-
ware revision code. (Information displayed varies
by model).
Press the key. FC (factory configuration) dis-
plays. (A typical example is shown, but informa-
tion displayed varies by model. This information
is for factory use only.)
Setting °C or °F.
Press the key again to display the current
setting.
Press the key to change the °C or °F indication.
Setting Heat Cycle Rate (see Table 2 for the cycle rate
options and equipment).
Press the key to display the current heat cycle
rate setting of 1, 3, 4, 5, 9, or 12 cph.
If the desired cycle rate is displayed, press the
key to display heating and cooling algorithm
default.
To change the heat cycle rate, press the key
until your choice of 1, 3, 4, 5, 6, 9, or 12 is dis-
played.
Press the key to display the heating and
cooling temperature control algorithm configura-
tion default.
Press the key to change the heating and cool-
ing control algorithm to C1 or C3.
C1 = Standard control algorithm.
C3 = Aggressive control algorithm (Default. Can
cause overshooting.)
M20514
S
Y
S
T
E
M
Cool Off Heat
Auto On
FAN
Hold
Select
T
U
E
PM
AA BATTERIES (3)
M12582
A
SET
HT.
M1258
3
M12584
A
M12589
A
M12588
A
M1469
1
6


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