X-XX UL
INSTALLATION INSTRUCTIONS
®U.S. Registered Trademark
Copyright © 1999 Honeywell Inc. • • All Rights Reserved
T834B; T834C; T834J
Heating-Cooling Thermostats
APPLICATION
The T834B,C,J Heating-Cooling Thermostats provide 24
to 30 Vac control in heating-cooling systems. An spdt
mercury switch makes R to W on a temperature fall for
heating, and R to Y on a temperature rise for cooling.
Integral switches control HEAT-OFF-COOL or COOL-OFF
system operation and AUTO-ON or ON-AUTO fan
operation (fan switch on T834C,J only). In heat pump and
some electric heat systems, fan operation is controlled by
the thermostat during heating. Check the electric heat
manufacturer specifications for fan control requirements. If
fan control from the thermostat is necessary in an electric
heat application, use the T834C Thermostat model (dual
fuel) with optional fan control. Jumper terminals 1 and 2 to
control fan operation from the thermostat during heating.
JUMPER
M8675
R
1
W
Y
G
2
1
1
2
2
IN ELECTRIC HEAT AND HEAT PUMP APPLICATIONS, JUMPER
TERMINALS 1 AND 2 FOR AUTOMATIC FAN CONTROL IN HEATING
AND COOLING.
IN GAS-AND OIL-FIRED APPLICATIONS, JUMPER TERMINALS 1
AND Y FOR AUTOMATIC FAN CONTROL IN COOLING.
Fig. 1. Jumpering terminals for fan control.
RECYCLING NOTICE
This control contains mercury in a sealed tube.
Do not place control in the trash at the end of
its useful life.
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash.
Contact your local waste management authority
for instructions regarding recycling and the proper
disposal of this control, or of an old control
containing mercury in a sealed tube.
INSTALLATION
When Installing this Product…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
CAUTION
Damage to Heating/Cooling System Possible.
Be careful when handling wires during
installation.
Disconnect power at furnace or at main breaker/
fuse before starting installation.
Location
Locate the thermostat about 5 ft (1.5m) above the floor on
an inside wall in an area with good air circulation at
average temperature.
Do not mount the thermostat where it may be affected by:
—
drafts or dead spots behind doors or in corners.
—
hot or cold air from ducts.
—
radiant heat from the sun, fireplaces, or appliances.
69-0444-10
