Honeywell T822/T827 Series Thermostat Owner's Manual and Installation Guide

Product Overview

This manual provides instructions for the Honeywell T822/T827 Series Thermostat, covering installation, operation, and specifications.

Product Application

This thermostat controls the following systems:

• 24 Vac heating systems (T822K)
• 750 mV or 12 Vdc heating systems (T827K)
• 24 Vac cooling systems (T822L)

System Types Supported:

• Gas or oil
• Warm air, hot water, high-efficiency furnaces, heat pumps, steam, gravity
• Normally closed hot water valves (T822K)
• 2-wire cooling systems (T822L)
• Normally open hot water valves (T822L)

Specifications

• Temperature Control Range: 45° to 95°F (7° to 35°C) or 35° to 85°F (2° to 29°C)
• Operating Ambient Temperature: 0° to 120°F (-18° to 49°C)
• Operating Relative Humidity: 5% to 90% (non-condensing)

Dimensions:

• Vertical Model: 2.88"W x 4.75"H x 1.5"D (73mm x 121mm x 38mm)
• Horizontal Model: 4.75"W x 2.88"H x 1.5"D (121mm x 73mm x 38mm)

Electrical Ratings:

¹ T822K and T827K

² T822L

Installation

Pre-installation Checklist:

Package Contents:

• Thermostat
• Wall anchors & screws (2 each)

Tools and Materials Needed:

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

Installation Warnings:

⚠️ CAUTION: ELECTRICAL HAZARD Can cause electrical shock or equipment damage. Disconnect power before beginning installation.

MERCURY NOTICE: If replacing a control with a mercury switch, do not discard in trash. Contact local waste management for disposal instructions.

Must be installed by a trained, experienced technician.

Base Installation:

1. Pull wires through the wire hole. Position the base on the wall, level it, and mark hole positions.

2. Drill holes (3/16" for drywall, 7/32" for plaster) and tap in wall anchors.

3. Pull wires through the base, position over anchors, and insert screws. Check level if desired, then tighten screws.

Wiring:

1. Loosen screw terminals, insert bare wires beneath screws, and re-tighten.

2. Push excess wire back into the wall opening.

3. Plug the wall opening with nonflammable insulation to prevent drafts.

Terminal Designations:

• R: Heating power. Connect to the secondary side of the heating system transformer.
• W¹: Heat relay.
• Y²: Cool relay, or normally open hot water valve.
• G: Fan relay (select models only).

Wire Specifications:

Use 18-gauge thermostat wire. Shielded cable is not required.

Set Heat Anticipator (Model T822K Only):

Move the adjustment arrow to the proper setting for your system:

Thermostat Mounting:

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

Operation

Fan Switch (select models):

• On: Fan runs continuously.
• Auto: Fan runs only when heating or cooling system is on.

System Switch (select models):

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

Temperature Setting:

Adjust to set desired indoor temperature. Note: Temperature scale varies by model.

[Diagram Description: The thermostat display shows a temperature scale from 50 to 90 degrees Fahrenheit. Controls include a fan switch with 'On' and 'Auto' positions, and a system switch with 'Heat', 'Off', and 'Cool' positions.]

5-Year Limited Warranty

Honeywell warrants this product against defects in workmanship and materials for five (5) years from the date of purchase. If the product is defective, Honeywell will repair or replace it. This warranty does not cover removal or reinstallation costs. It does not apply if damage is due to consumer misuse. Honeywell is not liable for incidental or consequential damages. Implied warranties are limited to five years. This warranty gives you specific legal rights; other rights may vary by state.

For warranty questions, contact Honeywell Customer Relations at 1-800-468-1502 or write to the addresses provided in the manual.

Support

For assistance with this product, visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-800-468-1502.