Honeywell ELECTRONIC THERMOSTATS T8401C Installation Instructions Manual page 6

T8401C ELECTRONIC THERMOSTATS
Optional System Checkout
When in steps 2 and 3 only, the
turn heat or cool outputs on and off. Change the
SYSTEM switch setting to test heat or cool outputs.
No action takes place If the SYSTEM switch is in the
Off position.
Examples: System setting at HEAT: If heat is on, the
key turns it off; if heat is off,
System setting at COOL: If cool is on,
off; if cool is off,
2. Press the keys simultaneously for more than
one second to light all segments on display and to
enter installer setup mode. When the keys are
released, a two-digit software revision code is dis-
played.
NOTE: NOTE: In installer setup mode only, each press
of the key momentarily displays 01. Each
press of the
When the keys are released, these two-digit
codes are no longer displayed.
3. Press the key. Factory information is displayed.
A typical example is shown, but information dis-
played varies by model. This information is for fac-
tory use only.
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 rate is dis-
played, press the
mode. To change the heat cycle rate, press the
key to scroll between 1, 3, 4, 5, 6, 9, and 12. Stop
69-1483—1
key can be used to
turns it on.
M14684
key turns it
turns it on.
M14685
M14686
key momentarily displays 02.
M14687
M14688
M14689
key to exit the installer setup
scrolling when the desired cycle rate is displayed.
See Table 3 for the cycle rate options and the cor-
responding system equipment.
Table 3. Heating Cycle Rates.
System
Steam, Gravity
Hydronic Heat, Condensing
Gas
a
Furnaces
Gas or Oil Forced Air
Electric Heat
b
Special Applications
a
High Efficiency Furnace.
b
Refer to equipment manufacturer's instructions.
NOTE: NOTE: Steps 7 and 8 are available on select
models.
7. Press the key to display cooling algorithm con-
figuration default.
8. Press the key again to change cooling algorithm
to C1 or C3.
C1 = Standard cooling algorithm.
C3 = Aggressive cooling algorithm (can cause
overshooting).
9. Press the key again. Current configuration (CC)
is displayed. A typical example is shown, but CC
varies by model.
10. Press the key to save all changes, exit installer
setup mode and return to normal operation.
NOTE: After exiting installer setup mode, change the
setpoint to the desired room temperature.
CHECKOUT
Heating
1. Slide the SYSTEM switch to Heat and the FAN
switch to Auto.
2. Press and hold the
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
6
M14690
Cycles Per Hour
1
3
6
9
12
M18419A
key to raise the temperature