Carrier Gas Furnace Owners Manual

The Carrier Gas Furnace is a high-efficiency heating system designed for residential use, featuring advanced combustion technology, variable-speed blower motor, electronic ignition system, multi-speed operation, diagnostic LED indicator, safety shut-off controls, and energy-saving programmable thermostat compatibility. Operating on natural gas or propane, this furnace provides reliable heating with AFUE ratings up to 98.5%. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Heat exchanger, blower assembly, gas valve, ignition system, pressure switches, flame sensor, control board, air filter, vent system.

Installation Requirements

Professional installation required. Ensure proper location and clearances.

1. Location: Install in well-ventilated area with minimum clearances as specified.
2. Gas connection: Use black iron pipe; apply pipe dope to male threads only.
3. Electrical: 120V AC, 15 amp dedicated circuit required.
4. Venting: PVC pipe system per local codes and manufacturer specifications.
5. Drain line: Install condensate drain with proper trap and routing.

WARNING! Gas furnaces produce carbon monoxide; proper venting is critical. Installation must comply with local codes and regulations.

First-Time Startup

Professional startup procedure by qualified technician.

1. Verify all connections: Gas, electrical, venting, and drain.
2. Check gas pressure: Adjust manifold pressure per specifications.
3. Test safety controls: Verify limit switches, pressure switches, roll-out switches.
4. Check combustion: Measure flue gas temperature and CO levels.
5. Program thermostat: Set heating schedule and temperature settings.

CAUTION! Only qualified HVAC technicians should perform startup procedures. Improper setup can create hazardous conditions.

Technical Specifications

• Heating Capacity: 40,000 to 120,000 BTU/h models available
• AFUE Rating: Up to 98.5% efficiency
• Gas Type: Natural gas or propane (conversion kit required)
• Electrical: 120V AC, 60Hz, 15 amp circuit
• Blower Motor: Variable-speed ECM
• Sound Rating: As low as 65 dBA
• Venting: 2" PVC pipe for combustion air and exhaust
• Filter Size: Standard 16x25x1 or 20x25x1
• Warranty: 10-year heat exchanger, 5-year parts

Controls and Settings

Access control board via front panel. Diagnostic codes displayed via LED flash patterns.

Thermostat: POWER, FAN (Auto/On), HEAT, COOL, EMERGENCY HEAT, temperature settings.

Control Board: POWER switch, diagnostic LED, dip switches for blower speeds, gas valve pressure adjustment. Settings: Blower off delay, heating speed, cooling speed, thermostat type. Diagnostic codes: 1 flash (pressure switch), 2 flashes (ignition failure), 3 flashes (limit switch), 4 flashes (flame sense), 5 flashes (roll-out switch).

Thermostat Connection

Compatible with standard 24V thermostats. Wiring: R (power), W (heat), G (fan), Y (cool), C (common).

1. Turn off furnace power at disconnect or circuit breaker.
2. Remove thermostat cover and connect wires per wiring diagram.
3. Match thermostat type (conventional or heat pump) with dip switch settings.
4. Restore power and test operation.

Tip: Use programmable thermostat for maximum energy savings and comfort control.

Operating Instructions

Normal operation controlled by thermostat settings.

1. Set thermostat to desired temperature and HEAT mode.
2. Furnace will initiate startup sequence: inducer motor, pressure switch check, igniter warm-up, gas valve opening.
3. Once flame established, blower will start after predetermined delay.
4. When thermostat satisfied, gas valve closes, blower continues for post-purge.
5. For continuous fan operation, set thermostat FAN to ON position.

WARNING! Never adjust gas pressure or safety controls. Contact qualified technician for service.

Safety Features

Multiple safety systems: Flame roll-out switches, high-limit switches, pressure switches, flame sensor, igniter control. Carbon monoxide detection recommended with furnace installation.

Maintenance & Cleaning

Monthly filter inspection/replacement. Annual professional maintenance recommended.

1. Filter: Replace every 1-3 months depending on usage and environment.
2. Burners: Professional cleaning annually to remove debris.
3. Flame sensor: Clean with emery cloth during annual maintenance.
4. Drain system: Flush condensate trap and drain line monthly.
5. Venting: Inspect for obstructions or damage annually.

CAUTION! Turn off power and gas supply before performing any maintenance. Only qualified technicians should service internal components.

Regulatory Information

UL certified for safety standards. ANSI Z21.47 compliant for gas-fired central furnaces. CSA International certified. Meets U.S. Department of Energy efficiency standards. For support, visit www.carrier.com or contact 1-800-CARRIER. Installation must comply with National Fuel Gas Code NFPA 54 and local building codes.

Troubleshooting

Reset: Turn power off for 30 seconds, then restore.

Service: 1-800-CARRIER; www.carrier.com