Honeywell T834 Series Thermostat Owner’s Manual
- June 9, 2024
- Honeywell
Table of Contents
Honeywell T834 Series Thermostat Owner
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 screwdrivers
- 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.
CAUTION: ELECTRICAL HAZARD
Can cause electrical shock or equipment damage. Disconnect power before
beginning installation.
MERCURY NOTICE
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
This thermostat provides control of 24 Vac single-stage heating and cooling systems.
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 fan
- Cool only
System Settings
- Heat, Off, Cool (T834N)
- Off, Cool (T834L)
Fan Settings
- Auto, On
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
Specifications
- 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 x73H x 38D (mm)
Base installation
- Pull wires through wire hole. Position base on wall, level and mark hole positions.
- Drill holes (3/16” for drywall, 7/32” for plaster), then tap in supplied wall anchors.
- Pull wire through base, position over anchors, then insert and tighten mounting screws. Check level if desired.
Wiring
- Loosen screw terminals, insert bare wires beneath screws, then re-tighten screws.
- Push excess wire back into the wall opening.
- Plug the wall opening with nonflammable insulation to prevent drafts from affecting thermostat operation.
Terminal Designations
- R Heating power. Connect to secondary side of heating system transformer.
- Rc Cooling power. Connect to secondary side of 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. ** Not present in T834L model
NOTES
R & Rc terminals In single-transformer system, leave metal jumper in place
between R & Rc. Remove metal jumper if two-transformer system.
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 18-gauge thermostat wire. Shielded cable is not required.
Set fan switch (except model T834L)
Fan operation settings
- 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 heat pump or electric heat systems. (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.
Operation
Fan switch
- On: Fan runs continuously.
- Auto: Fan runs only when heating or cooling system is on.
System switch
- Cool: Controls the cooling system.
- Heat: Controls the heating system.
- Off: All systems are off.
Temperature setting: Adjust to set desired indoor temperature.
CAUTION: EQUIPMENT DAMAGE HAZARD. Do not operate cooling system when outdoor temperature is below 50°F (10°C).
5-year limited warranty
Honeywell warrants this product to be free from defects in the workmanship or materials, under normal use and service, for a period of five (5) years from the date of purchase by the consumer. If at any time during the warranty period the product is determined to be defective or malfunctions, Honeywell shall repair or replace it (at Honeywell’s option). If the product is defective, (i) return it, with a bill of sale or other dated proof of purchase, to the place from which you purchased it; or (ii) call Honeywell Customer Care at 1-800-468-1502. Customer Care will make the determination whether the product should be returned to the following address: Honeywell Return Goods, Dock 4 MN10-3860, 1885 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 Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer. Honeywell’s sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL 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 HONEYWELL 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 FIVEYEAR 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 warranty questions, please write Honeywell Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call 1-800-468-1502. In Canada, write Retail Products ON15-02H, Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V4Z9.
firealarmresources.com ® U.S. Registered Trademark. Patents pending. Copyright © 2006 Honeywell International Inc. All rights reserved.
Need Help?
For assistance with this product please visit http://yourhome.honeywell.com
or call Honeywell Customer Care toll-free at
1-800-468-1502
Automation and Control Solutions
Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 http://yourhome.honeywell.com Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 ® U.S. Registered Trademark. © 2006 Honeywell International Inc. Patents pending. All rights reserved. Printed in China. 69-1944EFS • 05-2006