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69-1481-1 G.H. Rev. 2-02 Printed in U.S.A. www.honeywell.com/yourhome
T8411R ELECTRONIC HEAT PUMP THERMOSTAT
Automation and Control Solutions
Honeywell Honeywell Limited-Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
5. Press the ▼ key to change the °C or °F indication.
NOTE: Stage-one heat and cool cycle rates are fixed at
3 cph. Only stage-two heat cycle rates are
selectable.
6. Press the ▲ key to display the heat cycle rate of 3,
4, 5, 6, 9 or 12. If the desired cycle is displayed,
see Table 1, press the ▲ key to exit the installer
setup mode. To change the heat cycle rate, press
the ▼ key to scroll between 3, 4, 5, 6, 9, and 12.
Stop scrolling when the desired rate is displayed.
a
High efficiency furnace.
b
Refer to equipment manufacturer’s instructions.
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. (This information is for factory use
only.)
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 ▲ key to raise the temperature
setting several degrees above the room tempera-
ture. After approximately five minutes, the heating
equipment should start.
3. Press the ▼ key to lower the temperature setting
below the room temperature. Heating equipment
should stop.
Cooling
CAUTION
Equipment Damage Hazard.
Operating at too low of an outdoor
temperature may cause compressor damage.
Do not operate cooling if outdoor temperature is
below 50°F (10°C). Refer to manufacturer’s
recommendations.
• For compressor protection, allow the
compressor to remain off for five minutes
before restarting.
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
and fan should start.
3. Press the ▲ key to raise the temperature setting
above the room temperature. Cooling system
should shut down.
Fan
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. The system turns the
fan on and off with the equipment.
Make certain all equipment responds properly to the
thermostat.
Table 1. Heat Cycle Rates.
System Cycles per Hour
Hydronic heat, condensing gas
furnace
a
3
Gas or oil forced air 6
Electric heat 9
Special applications
b
4, 5, 12
M14689
M14690
M18421
or
M18420