69-1494–1
6
T8400B,C; T8401C ELECTRONIC THERMOSTATS
3. Press the
▲
key. Factory information is displayed.
A typical example is shown, but information
displayed varies by model. This information is for
factory use only.
CHECKOUT
Heating
1. Slide the SYSTEM switch to Heat. Slide the FAN
switch to Auto, if available.
2. Press and hold the
▲
key to raise the temperature
setting several degrees above the room tempera-
ture. After approximately ten seconds, the heating
equipment should start. In conventional systems,
the system turns on the fan through the use of a
time delay relay or through a limit control. When
using an electric heat thermostat, the fan starts
immediately.
3. Press the
▼
key to lower the temperature setting
below the room temperature. Heating equipment
should stop.
Cooling (Not Available on all Models)
CAUTION
Low Temperature Hazard.
Operating at too low of an outdoor tempera-
ture may cause compressor damage.
Do not operate cooling if outdoor temperature is
below 50
°
F (10
°
C). Refer to equipment manu-
facturer’s recommendations.
1. Slide the SYSTEM switch to Cool and the FAN
switch to Auto.
2. Press the
▼
key to lower the temperature setting
several degrees below the room temperature.
After approximately five minutes, the cooling
equipment should start. The fan starts and stops
with the cooling equipment.
3. Press the
▲
key to raise the temperature setting
above the room temperature. Cooling system
should shut down.
Fan (Not Available on all Models)
1. Slide the SYSTEM switch to Off and the FAN
switch to On. The fan should run continuously.
2. Slide the FAN switch to Auto. In heating, the fan is
controlled directly by the heating equipment and
may start a few minutes after the heating equip-
ment turns on (for most systems). When using an
electric heat thermostat, the fan starts and stops
with the heating equipment. In cooling, the fan
starts and stops with the cooling equipment.
Make certain all equipment responds properly to the
thermostat.
4. Press the
▲
key again to display
°
C or
°
F.
5. Press the
▼
key
to change the
°
C or
°
F indication.
6. Press the
▲
key
to display the heat cycle rate of
1, 3, 4, 5, 6, 9, or 12. If the desired cycle is
displayed, press the
▲
key
to exit the installer
setup mode. To change the heat cycle rate, press
the
▼
key to scroll between 1, 3, 4, 5, 6, 9, and
12. Stop scrolling when the desired rate is
displayed. See Table 1 for the cycle rate options
and the corresponding system equipment.
Table 1. Heating Cycle Rates.
NOTE: Steps 7 and 8 are available on select models.
7. Press the
▲
key to display cooling algorithm
configuration default.
System
Cycles Per Hour
Steam, Gravity
1
Hydronic Heat, Condensing Gas
Furnaces
a
3
Gas or Oil Forced Air
6
Electric Heat
9
Special Applications
b
12
a
High Efficiency Furnace.
b
Refer to the equipment manufacturer’s Instructions.
M14690
M14687
M14688
M14689
M18419
8. Press the
▲
key to change cooling algorithm to
C1 or C3.
C1 = Standard cooling algorithm.
C3 = Aggressive cooling algorithm (can cause
overshooting).
9. Press the
▲
key to save all changes, exit installer
setup mode and return to normal operation.
4, 5, 12
