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T8034C HEATING AND COOLING THERMOSTAT
3 69-1596
Fig. 3. Internal schematic and typical hookup for T8034C1085 in dual-transformer heating-cooling systems.
SETTINGS AND ADJUSTMENTS
Temperature Setting
Push the temperature setting lever to the desired control
point on the temperature scale. The same lever controls
the temperature setting for either heating or cooling.
System and Fan Switching
The T8034C has System and Fan switches to control the
heating-cooling systems and fan.
The System switch controls system operation:
Heat: Operates only heating system.
Off: Both heating and cooling systems are discon-
nected.
Cool: Operates only cooling system.
The Fan switch controls fan operation:
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 oper-
ates in response to the thermostat in both heating
and cooling.
On: The fan runs continuously.
To switch positions, use thumb and index finger to slide
lever to desired position. Stop switch lever in detent
directly over desired position. Stop switch lever in detent
directly over desired function indicator mark for correct
circuit operation.
Heat Anticipator Setting
IMPORTANT
The T8034C Thermostat has an adjustable heat
anticipator and operates correctly only if the
anticipator is adjusted to match the current draw
of the primary control. Use this thermostat only
on systems with current draw that falls within
the range of the heat anticipator. Do not use this
device on Powerpile® Systems (millivolt).
Look for the current rating stamped on the nameplate of
the primary control. Set the adjustable heat anticipator
indicator to match the value shown on the nameplate.
If the current rating is not available, proceed as follows to
determine the rating:
1. Turn off the power.
2. Wire the thermostat, but do not mount it on the
wall.
3. Connect the ammeter between the W wire and the
W terminal on the thermostat (in series with the pri-
mary control).
4. Prepare the system for operation.
5. Turn on the power.
6. Turn the System switch to Heat.
7. Increase the thermostat setpoint, as necessary, to
begin operating the system.
8. With the system operating through the ammeter,
wait one minute, then read the ammeter.
9. Turn the System switch to Off and turn off the
power.
10. Adjust the heat anticipator to match the ammeter
reading.
11. Disconnect the ammeter, reconnect the W wire,
and mount the thermostat.
NOTE: For best performance, the heat anticipator may
require further adjustment. To lengthen burner-
on time, move the indicator in the direction of
the longer arrows but not more than one-half
scale marking at one time. To shorten burner-on
time, move the indicator in the opposite direc-
tion.
CHECKOUT
CAUTION
Equipment Damage Hazard.
Heat anticipator can be damaged.
Do not check operation by shorting across
system control terminals.
IMPORTANT
To assure accurate temperature control, do not
touch or breathe on bimetal or thermometer.
H1
TEMP. FALL
C1
L1
(HOT)
L2
1
L1
(HOT)
L2
1
1
2
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
IN SINGLE TRANSFORMER SYSTEMS, JUMP RC AND RH.
HEAT RELAY
COOL RELAY
FAN RELAY
FAN SWITCH
ON
AUTO
COOL
OFF
HEAT
COOL
OFF
HEAT
SYSTEM
SWITCH
C1
ANTICIPATOR
H1
ANTICIPATOR
M2043C
W
RH
Y
G
RC