Honeywell Furnace Thermostat Manual

The Honeywell Furnace Thermostat is a programmable temperature control device designed for residential and commercial heating systems. It features digital display, programmable schedules, temperature hold functions, system mode selection (heat/cool/off), fan control, battery backup, filter change reminder, and compatibility with most standard furnace systems. Below are key sections for installation, programming, operation, troubleshooting, and maintenance.

Features at a Glance

Key components: Digital LCD display, Program buttons, System mode selector, Temperature controls, Battery compartment, Wiring terminals.

Installation

Turn off power to furnace before installation. Remove old thermostat and prepare mounting location.

1. Turn off power: Switch off circuit breaker for furnace system.
2. Remove old thermostat: Label wires before disconnecting.
3. Mount new base: Level and secure to wall with screws provided.
4. Connect wires: Match labeled wires to corresponding terminals (R, W, Y, G, C).
5. Attach thermostat: Snap onto mounting base.
6. Restore power: Turn circuit breaker back on.

WARNING! Electrical shock hazard - ensure power is completely off before wiring. Use qualified HVAC technician if unsure.

First-Time Setup

After installation, configure basic settings for proper operation.

1. Install batteries: Insert 2 AA alkaline batteries for backup power.
2. Set time and date: Use program menu to set current time and day.
3. Configure system type: Select conventional or heat pump system.
4. Set temperature limits: Configure minimum and maximum temperature ranges.
5. Program schedule: Set up daily temperature programs for energy savings.
6. Test operation: Verify furnace responds correctly to temperature changes.

CAUTION! Allow system to complete startup cycle before making adjustments.

Specifications

• Temperature Range: 40°F to 90°F (4°C to 32°C)
• Power Requirements: 24VAC from furnace; 2 AA batteries backup
• Display: Backlit LCD with temperature and status icons
• Programming: 7-day, 4 periods per day programmable
• Temperature Control: ±1°F accuracy
• Compatibility: Standard 24VAC heating/cooling systems
• Terminals: R, W, Y, G, C standard wiring
• Operating Temp: 32°F to 122°F (0°C to 50°C)
• Dimensions: 5.5" x 3.5" x 1" (140mm x 89mm x 25mm)

Controls and Settings

Front panel controls: Up/Down temperature buttons, System mode button, Fan button, Program button, Hold button.

Menu Navigation: Press and hold program button to access settings menu. Use up/down to navigate options.

System Settings: Heat/Cool/Off mode selection, Fan Auto/On control, Temperature calibration, Filter change interval, Keypad lock, System test mode. Programming: Wake time, Leave time, Return time, Sleep time temperatures for each day of week.

Wiring Configuration

Standard terminal designations: R (24V power), W (Heat), Y (Cool), G (Fan), C (Common).

1. R Terminal: 24VAC power from furnace transformer
2. W Terminal: Heat stage 1 control
3. Y Terminal: Cooling stage 1 control
4. G Terminal: Fan relay control
5. C Terminal: Common 24VAC return
6. Additional terminals: W2, Y2 for multi-stage systems

Tip: Take photo of existing wiring before disconnecting old thermostat for reference.

Programming Schedule

Create energy-saving temperature schedules for different times of day.

1. Access programming: Press and hold PROGRAM button until display flashes.
2. Select day: Choose specific day or copy to all days.
3. Set periods: Program 4 temperature periods (Wake, Leave, Return, Sleep).
4. Set temperatures: Use up/down arrows to set desired temperature for each period.
5. Save program: Press PROGRAM to save and move to next period.
6. Review schedule: Use program review mode to verify settings.
7. Vacation hold: Set extended hold temperatures for vacation periods.
8. Temporary hold: Use HOLD button for temporary temperature override.

WARNING! Do not set temperatures below 55°F in winter to prevent pipe freezing.

System Operation

Normal operation modes and system responses to temperature changes.

Heat Mode: Furnace activates when room temperature drops below set point. Cool Mode: Air conditioner activates when room temperature rises above set point. Auto Mode: Automatically switches between heat and cool based on temperature. Fan Operation: Auto mode runs fan only during heating/cooling cycles; On mode runs fan continuously.

Care & Maintenance

Regular maintenance ensures optimal performance and longevity.

1. Clean display: Use soft, dry cloth only - no liquids or cleaners.
2. Replace batteries: Change AA batteries annually or when low battery icon appears.
3. Check wiring: Ensure all connections remain tight and secure.
4. Update filter reminder: Reset after each filter change.
5. Verify calibration: Check temperature accuracy periodically.

CAUTION! Never use water or chemical cleaners on thermostat. Turn off power before any maintenance.

Regulatory Information

UL Listed: Complies with UL 873 safety standards. FCC Part 15: Class B digital device compliant. Manufactured to meet industry standards for temperature controls. Copyright © Honeywell International Inc. For technical support, visit www.honeywellhome.com or contact 1-800-468-1502. Warranty: 3-year limited warranty from date of purchase.

Troubleshooting

Reset: Remove batteries and disconnect from furnace for 30 seconds to reset.

Service: 1-800-468-1502; www.honeywellhome.com