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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.
R
1
W
1
IN ELECTRIC HEAT AND HEAT PUMP APPLICATIONS, JUMPER
TERMINALS 1 AND 2 FOR AUTOMATIC FAN CONTROL IN HEATING
AND COOLING.
2
IN GAS-AND OIL-FIRED APPLICATIONS, JUMPER TERMINALS 1
AND Y FOR AUTOMATIC FAN CONTROL IN COOLING.
Fig. 1. Jumpering terminals for fan control.
®U.S. Registered Trademark
Copyright © 1999 Honeywell Inc. •
Heating-Cooling Thermostats
2
G
JUMPER
Y
1
2
M8675
• All Rights Reserved
T834B; T834C; T834J
INSTALLATION INSTRUCTIONS
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.
X-XX UL
69-0444-10
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Table of Contents
Related Manuals for Honeywell T834B
Summary of Contents for Honeywell T834B
- Page 1 APPLICATION RECYCLING NOTICE This control contains mercury in a sealed tube. The T834B,C,J Heating-Cooling Thermostats provide 24 Do not place control in the trash at the end of to 30 Vac control in heating-cooling systems. An spdt its useful life.
-
Page 2: Wiring And Mounting
The T834 may be mounted directly on a wall or vertical bottom mounting hole. Do not tighten. outlet box. Use Honeywell part no. 193121A Mounting 8. Level the thermostat exactly using a spirit level or Plate Assembly (ordered separately) to mount on horizon- plumb line. - Page 3 T834B; T834C; T834J HEATING-COOLING THERMOSTATS (HOT) FAN SWITCH FAN RELAY AUTO TEMP. FALL ANTICIPATOR ANTICIPATOR SYSTEM SWITCH COMPRESSOR COOL HEAT CONTACTOR HEAT COOL HEAT RELAY POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. IN ELECTRIC HEAT APPLICATION, JUMPER 1 AND 2 FOR AUTO FAN IN HEATING.
- Page 4 T834B; T834C; T834J HEATING-COOLING THERMOSTATS (HOT) SWITCH FAN RELAY AUTO TEMP. FALL COMPRESSOR CONTACTOR SYSTEM ANTICIPATOR SWITCH COOL HEAT ANTICIPATOR CHANGEOVER HEAT COOL RELAY (HEAT) CHANGEOVER RELAY (COOL) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M2108A Fig. 7. Internal schematic and typical hookup for T834C in single-stage heat pump system.
- Page 5 FAN RELAY HEAT COOL COMPRESSOR RELAY M6108A POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Fig. 11. Internal schematic and typical hookup for T834B in heating-cooling system with zone valve. (HOT) FAN SWITCH FAN RELAY AUTO TEMP. FALL ANTICIPATOR "P"...
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Page 6: Settings And Adjustment
The T834 Thermostat has an adjustable heat anticipator and will operate properly ONLY IF T834B THE ANTICIPATOR IS ADJUSTED TO MATCH The T834B features a SYSTEM switch for control of the THE CURRENT DRAW OF THE PRIMARY heating-cooling system. CONTROL. Use this thermostat only on systems... - Page 7 T834B; T834C; T834J HEATING-COOLING THERMOSTATS Electric Systems (with auto fan in heat) Cooling Set adjustable anticipator to combined current draw of heating and fan relays. CAUTION Damage to Compressor Possible. Other Systems (without auto fan in heat) Operating at too low of an outdoor temperature Set adjustable anticipator to current draw of heat relay may cause compressor damage.
- Page 8 1. Place the temperature setting lever at the same setting as the thermometer. Remove cover. 2. Insert Honeywell part no. 104994A Calibration Wrench (order separately) onto the hex nut under the coil. See Fig. 13. Holding the setting lever so...