Honeywell Home T834 Series Thermostat Owner’s Manual

: June 7, 2024
: Honeywell Home

Table of Contents

Honeywell Home T834 Series Thermostat
Pre-installation checklist
Product application
- System Types
- Electrical Ratings
Specifications
Base installation
Thermostat mounting
Operation
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Honeywell Home T834 Series Thermostat

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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.)