Heat Anticipator Setting; Temperature Setting - Honeywell T841A Installation Instructions Manual

Grasp the thermostat cover at the top and bottom with one
hand. Pull outward on the bottom edge of the cover until it
snaps free of the thermostat base. Carefully remove and
save the packing material surrounding the mercury
switches.
1. Run the wiring (if necessary) to the location. If the
wiring is plastered into the wall, make a hole next to
the cable and loosen the wires so that they can be
pushed back into the wall later. Thread the wires
through the hole in the packing material saved
above. Connect the wires to the terminals on the
back of the thermostat. See Fig. 2 through 5.
2. Set the second stage adjustable heat anticipator to
match the current draw of the primary heating
control (see Heat Anticipator Setting section).
3. Push the excess wire back through the hole and
plug any opening with packing material to prevent
drafts that may affect thermostat performance.
4. Use screws to loosely secure the thermostat to the
wall or outlet box through the two mounting holes in
the middle of the device.
The sheetmetal screws included with the thermostat are
designed for use in plaster walls that do not need anchors.
IMPORTANT
An incorrectly leveled thermostat causes
inaccurate temperature control.
5. Level the thermostat using a spirit level or plumb
line. Tighten the two mounting screws at the middle
of the device.
6. Install the two screws in the top mounting holes and
tighten.
7. Replace the thermostat cover.
H1
C1
H1 & C1
ANTICIPATOR
FALL
H2 ANTICIPATOR
H2
FALL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 WHEN SYSTEM MONITOR IS CONNECTED TO L TERMINAL, EM. HT.
LED ALSO INDICATES COMPRESSOR MALFUNCTION.
3 X TERMINAL MUST BE CONNECTED FOR PROPER OPERATION.
Fig. 2. Internal schematic and typical wiring diagram for TRADELINE® T841A1308 with EM. HEAT and AUX. HEAT
LEDs. No fan control in EM. HEAT. Provides heat or cool changeover relay control.
T841A HEATING-COOLING HEAT PUMP THERMOSTAT
SETTINGS

Heat Anticipator Setting

The second stage heat anticipator is adjustable. Move the
adjustable indicator to match the current draw of the
second stage heating primary control, or the anticipator
setting of the old thermostat. See Fig. 6.

Temperature Setting

Move the setpoint lever to the desired control point on the
temperature scale.
SYSTEM Switch Setting
The SYSTEM switch positions control the system opera-
tion as follows:
FAN Switch Setting
FAN
SWITCH
AUTO
ON
AUX. HT.
LED (GREEN)
SYSTEM
SWITCH
EM. HEAT
HEAT
OFF
COOL
3
EM. HEAT: Emergency heat relay is energized. Cooling
system is off. Compressor is de-energized. Fan runs
on call for heat if FAN switch is in the AUTO
position. EM. HEAT LED is on.
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 the AUTO position, the cooling fan is
also off.
COOL: Cooling system is automatically controlled by
the thermostat. Heating system is off.
AUTO: Fan operates in response to thermostat in both
heating and cooling.
ON: Fan operates continuously.
ODT 1
RTD 1 EHR 1
ODT 2
ERH 2
FAN RELAY
G
R
SYSTEM
MONITOR
W2
E
RD
L
B
EM. HT.
CHANGEOVER
LED
RELAY (HEAT)
2
(RED)
X
COMPRESSOR
CONTACTOR
3
LACO
Y
CHANGEOVER
RELAY (COOL)
O
L1
(HOT)
L2
1
RTD 2
RTD 3
RTD 1
EM. HEAT
RELAY
CHP
M1099B
69-0452—8