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Honeywell

T834B; T834C; T834J

 

Heating-Cooling Thermostats

INSTALLATION INSTRUCTIONS

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  H

e

A

t

-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.

TERM INALS  1  AN D  2   FOR AUTO M ATIC  FAN  CONTRO L  IN  HEATING 

AN D  COOLIN G.

A

  IN  G AS-AND OIL-FIRED A P PLICATIONS, JUMP ER TERM INALS 1 

AN D  Y   FOR AU TO M ATIC   FAN  CONTRO L  IN  COOLING.

M8675

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.

A   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.

®U.S.  Registered Trademark 

Copyright © 1999 Honeywell Inc.

All  Rights  Reserved

69-0444-10

Summary of Contents for T834J

Page 1: ...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 instruct...

Page 2: ...t cover bypullingoutwardon bottomedgeofthecover until itsnapsfreeof the thermostat base See Fig 2 Carefullyrem ove anddiscardthefoamplasticshippinginsert that protectstheswitchandbim etal assemblyduring shipping 5 Set theadjustableheat anticipator indicatorto m atchthecurrent drawof theprimaryheating control seeHeatAnticipatorSettingsection 6 Pushexcesswire backthroughtheholeandplug anyopeningwith...

Page 3: ...G M2035A Fig 4 Internal schematic and typical hookup for T834C dual fuel model in a gas or oil fired or central electric heat system JUMPER W Y FOR SINGLE STAGE HEAT PUMP Fig 6 Internal schem atic and typical hookup for T834C gas or oil fired system s and single stage heat pump or central electric heat 3 69 0444 10 ...

Page 4: ...T834B T834C T834J HEATING COOLING THERMOSTATS H1 Fig 8 Internal schem atic and typical hookup for T834C with terminal for defrost relay in heat pump system FAN 69 0444 10 4 ...

Page 5: ...nd typical hookup for T834B in standard heating cooling system with no fan switching H1 A Fig 11 Internal schem atic and typical hookup for T834B in heating cooling system with zone valve Fig 12 Internal schem atic and typical hookup for T834J cooling only system 5 69 0444 10 ...

Page 6: ...scale Thesam elevercontrols bothheatingandcooling O nmodelswithtem perature rangestops temperaturesettinglevercanbemovedonly betweenthetwotemperaturerangestops HEAT ANTICIPATOR SETTING IMPORTANT The T834 Thermostat has an adjustable heat anticipator and will operate properly ONLY IF THEANTICIPATOR IS ADJUSTED TO MATCH THE CURRENT DRAW OF THE PRIMARY CONTROL Use this thermostat only on systems with...

Page 7: ...on inresponsetoacall for heatingorcooling Cooling A CAUTION Damage to Compressor Possible Operating at too low of an outdoor temperature may cause compressor damage D onot operatecoolingifoutdoortem perature is below50 F 10 C Refertomanufacturer recom m endations NOTE Toprevent compressorshortcycling am inim um off tim er maybeincludedtoprovideafive minute tim edelaybeforeactivatingthecompressoraf...

Page 8: ...ersoit doesnot m ove reinsertwrenchandcarefullyturn counterclockwise until themercuryrollsto theleftendof thetubebut nofarther 6 Recheckcalibration Set thermostat system switchfordesiredoperationandreplacecover COIL SHOWN WITHOUT HEAT ANTICIPATOR If recalibrationappearsnecessary proceedasfollows 1 Placethetem peraturesettingleverat thesam e settingasthethermometer Removecover 2 Insert Honeywell pa...

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