Setting And Adjustment - Honeywell T834C Installation Instructions Manual

T834C,T8034C HEATING-COOLING TRIPLE FUEL THERMOSTATS
H1
C1
TEMPERATURE
FALL
H1
ANTICIPATOR
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
2 JUMPER 1-2 FOR AUTO FAN IN HEATING AND COOLING (ELECTRIC HEAT AND SINGLE STAGE HEAT PUMP SYSTEMS).
3 JUMPER W-Y FOR SINGLE STAGE HEAT PUMP APPLICATIONS.
Fig. 4. Internal schematic and typical wiring diagram for central electric heat systems.
IMPORTANT
An incorrectly leveled thermostat causes the
temperature control to deviate from setpoint.
For optimum performance, level the thermostat
using a spirit level or plumb line. Tighten the
mounting screws.
Adjust the temperature setting lever so the mercury
bulb is in a horizontal position as shown in Fig. 1.
Carefully replace the thermostat cover.

SETTING AND ADJUSTMENT

Temperature Setting
Push the temperature setting lever to the desired control
point on the temperature scale. The same lever controls
the temperature setting for both heating and cooling.
System and Fan Switching
The T834C and T8034C feature SYSTEM and FAN
switches for control of the heating-cooling and fan systems.
The SYSTEM switch controls system operation as follows:
HEAT: The thermostat controls the heating system.
OFF: Both heating and cooling are off.
COOL: The thermostat controls the cooling system.
The FAN switch controls fan operation as follows:
AUTO: For gas- or oil-fired systems, the fan operates in
response to the thermostat in cooling and in
response to the plenum fan control in heating.
For electric heat or heat pump systems, the fan
operates in response to the thermostat in both
heating and cooling.
ON: The fan runs continuously.
69-1628
FAN SWITCH
AUTO
ON
C1
ANTICIPATOR
SYSTEM
SWITCH
COOL
OFF
HEAT
1
FAN RELAY
G
R
O
CHANGEOVER
RELAY (COOL)
2
2
HEAT RELAY
HEAT
W
OFF
3
COOL
Y
CHANGEOVER
RELAY (HEAT)
B
To switch positions, slide the lever to the desired position.
Stop the switch lever in detent directly over the desired
setting.
Heat Anticipator Setting
IMPORTANT
The T834C and T8034C Thermostats have an
adjustable heat anticipator and operate properly
ONLY IF THE ANTICIPATOR IS ADJUSTED TO
MATCH THE CURRENT DRAW OF THE
PRIMARY CONTROL. Use this thermostat only
on systems with current draws that fall within the
range of the heat anticipator. Do not use this
device on Powerpile® (millivolt) Systems.
A current rating is usually stamped on the nameplate of
the primary control. Set the adjustable heat anticipator
indicator to match the value given on the nameplate. For
heat pump applications, use the Heat Anticipator Settings.
If the current rating is not available, proceed as follows to
determine the rating:
Turn off the power.
Wire the thermostat, but do not mount it on the wall.
Connect an ammeter between the W wire and the
W terminal on the thermostat (in series with the
primary control).
Prepare the system for operation.
Turn on the power.
Turn the SYSTEM switch to HEAT.
Increase the thermostat setpoint as necessary to
start the system.
With the system operating through the ammeter,
wait one minute, then read the ammeter.
Turn the SYSTEM switch to OFF and turn off the
power.
4
COMPRESSOR
RELAY
M11343
L1
(HOT)
L2
1