T841DE HEATING-COOLING THERMOSTATS
SETTINGS
CHECKOUT
Heat Anticipator Setting
The heating anticipator is adjustable on the T841D and
the first stage heating on the T841E. Move the adjustable
indicator to match the current draw of the heating primary
control, or the anticipator setting of the old thermostat.
See Fig. 4.
NOTE: When T841D is used with heat pump systems,
set heat anticipator at 1.2.
Temperature Setting
Move the setpoint lever to the desired control point on the
temperature scale.
System Switch Setting
The system switching positions control the system
operation as described below:
HEAT: Heating system is automatically controlled by
the thermostat. Cooling system is off.
OFF: Both the heating and cooling systems are off.
If the fan is at AUTO position, the cooling fan
is also off.
COOL: Cooling system is automatically controlled by
the thermostat. Heating system is off.
Fan Switch Setting
AUTO: Fan operates in response to thermostat in
cooling.
ON: Fan operates continuously.
RATING OF
PRIM ARY CONTRO L
Heating
Move the system switch on the thermostat to HEAT and
the fan switch to AUTO. Move the setpoint lever to about
10°F (6°C) above room temperature. Heating should start.
The fan should start after a short delay. Move the setpoint
lever about 10°F (6°C) below room temperature. Heating
should shut off. The fan will shut off after a short delay.
Cooling
A CAUTION
Do not operate cooling if outdoor temperature is
below 50°F (10°C). Refer to the manufacturer
recommendations.
Move the system switch on the thermostat to COOL and
the fan switch to AUTO. Move the setpoint lever about
10°F (6°C) below room temperature. Cooling and fan
should start (see NOTE above). Move the setpoint lever
about 10°F (6°C) above room temperature. Cooling and
fan should shut off.
Fan
Move the system switch to OFF, and the fan switch to ON.
The fan should run continuously. Move the fan switch to
AUTO. In this position, the fan operates in response to the
thermostat in both heating and cooling.
Fig. 4. Adjustable heat anticipator indicator.
Honeywell
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