Honeywell Home T834 Series Thermostat Owner’s Manual
- June 7, 2024
- Honeywell Home
Table of Contents
Honeywell Home T834 Series Thermostat
View all Honeywell Home thermostat manual
T834 Series
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
1. Loosen screw terminals, insert bare wires beneath screws, then re-tighten
screws.
2. Push 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 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).
