Honeywell Home T834 Non-Programmable Thermostat Owner’s Manuals


Honeywell Home T834 Non-Programmable Thermostat


This manual covers the following models: Horizontal Mount: T8034N • Vertical Mount: T834N/T834L

Pre-installation checklist

Check package contents:

  • Thermostat
  • Wall anchors & screws (2 each)

Before you begin, make sure you have:

  • No. 2 Phillips & small pocket screw-drivers
  • Hammer
  • Level (optional)
  • Pencil
  • Drill and bit (3/16” for drywall, 7/32” for plaster)

Must be installed by a trained, experienced technician
Read these instructions carefully. Failure to follow these instructions can damage the product or cause a hazardous condition.

Can cause electrical shock or equipment damage. Disconnect power before beginning installation.

If this product is replacing a control that contains mercury in a sealed tube, do not place the old control in the trash. Contact your local waste management authority for instructions regarding recycling and proper disposal.

Product application

System Types

  • Gas, oil, or electric heat with air conditioning
  • Warm air, hot water, high-efficiency furnaces, heat pumps, steam, gravity
  • Heat only
  • Heat only with a fan
  • Cool only

System Settings

  • Heat, Off, Cool (T834N)
  • Off, Cool (T834L)

Fan Settings

  • Auto, On


Temperature Range

  • 50° to 90°F (10° to 32°C)

Operating Ambient Temperature

  • 0° to 120°F (-18° to 49°C)

Operating Relative Humidity

  • 5% to 90% (non-condensing)

Dimensions (vertical model)

  • 2.88W x 4.75H x 1.5D (inches)
  • 73W x 121H x 38D (mm)

Dimensions (horizontal model)

  • 4.75W x 2.88H x 1.5D (inches)
  • 121W x 73H x 38D (mm)

Electrical Ratings
Terminal Voltage (50/60Hz) Running Current

  • W Heating 20-30 Vac 0.02-1.2 A
  • Y Cooling 20-30 Vac 0.02-1.2 A
  • G Fan 20-30 Vac 0.02-0.6 A
  • O Cooling Changeover 20-30 Vac 0.02-0.5 A
  • B Heating Changeover 20-30 Vac 0.02-0.5 A

Base installation



  1. Pull wires through the wire hole. Position base on wall, level, and mark hole positions.
  2.  Drill holes (3/16” holes fo drywall, 7/32” holes for plaster), then tap in the supplied wall anchors.
  3. Pull wires through the base, position over anchors, and insert screws. Check level if desired, then tighten screws




  1.  Loosen screw terminals, insert bare wires beneath screws, then re-tighten screws.
  2.  Push any excess wire back into the wall opening.
  3.  Plug the wall opening with nonflammable insulation to prevent drafts from affecting thermostat operation.

Terminal Designations

  • R Heating power. Connect to the secondary side of the heating system transformer.
  • Rc Cooling power. Connect to the secondary side of the cooling system transformer.**
  • G Fan relay.
  • W Heat relay.**
  • B Heat pump changeover valve energized in heating.
  • O Heat pump changeover valve energized in cooling.
  • Y Compressor contactor is Not present in the T834L model.

R & Rc Terminals
In a single-transformer system, leave a metal jumper in place between R & Rc. Remove the metal jumper if two transformer systems.

Heat pump systems
If wiring to a heat pump, use a small piece of wire (not supplied) to connect terminals W and Y.

Wire Specifications
Use an 18-gauge thermostat wire. Shielded a wire is not required.

Set fan switch (except model T834L)


F: For gas or oil heating systems, leave the fan operation switch in this factory-set position (for systems that control the fan in a call for heat.)

E: Change the switch to this setting for a heat pump or electric heat system. (This setting is for systems that allow the thermostat to control the fan in a call for heat if a fan wire is connected to the G terminal.)

Set heat anticipator (except model T834L)


Move the adjustment arrow to the proper setting for your system (see table below).

Your system Setting

  • Steam 1.2
  • Hot water heat 0.8
  • Warm air (high efficiency) 0.8
  • Warm air (standard) 0.4
  • Electric heat 0.3

Thermostat mounting


Align the slots on the cover with tabs on the sides of the base, then push gently until the cover snaps into place.


Fan switch

  • On: Fan runs continuously.
  • Auto: The fan runs only when the heating or cooling system is on.HoneywellHome-T834-Non-Programmable-Thermostat-Owner's-Manuals-FIG-6

System switch

  • Cool: Controls the cooling system.
  • Heat: Controls the heating system.
  • Off: All systems are off.

Do not operate the cooling system when the outdoor temperature is below 50°F (10°C).

5-year limited warranty

Resideo warrants this product to be free from defects in workmanship or materials, under normal use and service, for a period of five (5) years from the date of first purchase by the original purchaser. If at any time during the warranty period, the product is determined to be defective due to workmanship or materials, Resideo shall repair or replace it (at Resideo’s option).If the product is defective,

  1. return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or
  2. call Resideo Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Resideo Return Goods, 1985 Douglas Dr. N., Golden Valley, MN 55422, or whether a replacement product can be sent to you. This warranty does not cover removal or reinstallation costs.

This warranty shall not apply if it is shown by Resideo that the defect was caused by damage that occurred while the product was in the possession of a consumer. Resideo’s sole responsibility shall be to repair or replace the product within the terms stated above. RESIDE SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY, FROM ANY BREACH OF ANY WARRANTY, EXPRESS OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT.

Some states do not allow the exclusion or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY RESIDEO MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE FIVE-YEAR DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you This warranty gives you specific legal rights, and you may have other rights which vary from state to state. If you have any questions concerning this warranty, please write Resideo Customer Care, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502.


Download Manual: Honeywell Home T834 Non-Programmable Thermostat Owner’s Manuals


Honeywell Home T834 Non-Programmable Thermostat Owner’s Manuals


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