Infinity 96 Gas Furnace Installation Manual

The Infinity 96 Gas Furnace is a high-efficiency residential heating system with 96% AFUE rating, variable-speed blower motor, modulating gas valve, two-stage heating operation, smart diagnostics, compatibility with Infinity System Control, sealed combustion system, corrosion-resistant heat exchanger, and quiet operation. Suitable for upflow, downflow, and horizontal installations. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Variable-speed ECM blower motor, modulating gas valve, stainless steel heat exchanger, pressure switches, ignition control board, gas valve, venting system.

Installation

Unpack and inspect all components. Verify proper location and clearances.

1. Position furnace: Ensure level installation with proper clearances (6" combustible, 1" non-combustible).
2. Connect gas supply: Use black iron pipe with proper thread sealant. Pressure test at 14" WC.
3. Install venting: Use PVC pipe for intake and exhaust. Maintain proper slope for condensate drainage.
4. Electrical connections: Connect 120V power supply and thermostat wiring.
5. Drain connections: Install condensate drain line with trap and proper routing.
6. Ductwork: Connect supply and return ducts securely.

WARNING! Gas appliances can be dangerous if improperly installed. Only qualified technicians should perform installation.

First-Time Setup

Complete installation verification and initial startup procedure.

1. Gas pressure adjustment: Set manifold pressure to 3.5" WC for natural gas.
2. Airflow configuration: Set dip switches for proper CFM based on installation.
3. Thermostat configuration: Connect compatible thermostat and configure settings.
4. System checkout: Verify all safety controls and operational sequences.
5. Combustion analysis: Verify proper CO levels and combustion efficiency.

CAUTION! Always verify gas connections are leak-free before energizing system.

Specifications

• AFUE Rating: 96%
• Heating Capacity: 40,000 to 120,000 BTU/H (multiple models)
• Gas Type: Natural gas (convertible to LP with kit)
• Electrical: 120V AC, 60Hz, 5-12 amps
• Blower Motor: Variable-speed ECM
• Airflow: 600-2000 CFM
• Venting: 2" PVC pipe (intake and exhaust)
• Sound Level: As low as 65 dB
• Dimensions: Varies by model (typical: 44"H x 21"W x 26"D)
• Warranty: 20-year heat exchanger, 5-year parts

Controls and Settings

Access control board via front panel. Diagnostic LEDs indicate system status.

Control Board: Status LEDs, dip switches, terminal connections.

Operating Modes: HEAT, COOL, FAN ONLY. Blower Settings: Continuous fan, timed off-delay. Temperature Control: Single-stage or modulating operation. Diagnostic Codes: LED flash patterns indicate specific faults. Configuration: Dip switches for airflow, heating capacity, thermostat type.

Connecting Components

Gas supply: Black iron pipe with sediment trap. Electrical: 120V power, 24V thermostat. Venting: PVC intake and exhaust. Drain: Condensate line with trap.

1. Turn off gas and electrical power before making connections.
2. Use proper pipe dope on gas connections (not Teflon tape).
3. Verify vent pipe slopes toward furnace for condensate drainage.
4. Ensure condensate trap is properly filled and sealed.

Tip: Always pressure test gas lines before connecting to furnace.

Operating Procedures

Normal operation sequence: Thermostat call, inducer motor start, pressure switch verification, ignition sequence, gas valve opening, flame sensing, blower activation.

1. Startup: Thermostat calls for heat, control board initiates sequence.
2. Inducer operation: Draft inducer motor runs for pre-purge.
3. Ignition: Hot surface igniter glows, gas valve opens.
4. Flame detection: Flame sensor verifies ignition.
5. Blower operation: Blower starts after heat exchanger warm-up delay.
6. Modulation: Gas valve modulates based on heating demand.
7. Shutdown: Gas valve closes, inducer continues for post-purge.

WARNING! Never bypass safety controls or operate without proper venting.

Safety Features

Flame rollout switches: Detect improper combustion. Pressure switches: Verify venting operation. High limit switches: Prevent overheating. Flame sensor: Confirms proper ignition. Ignition control: Safe start-up sequencing.

Maintenance & Cleaning

Annual maintenance required for optimal performance and warranty.

1. Filter replacement: Change every 1-3 months depending on usage.
2. Heat exchanger inspection: Check for cracks or corrosion annually.
3. Burner cleaning: Remove and clean burners as needed.
4. Drain system: Flush condensate trap and drain lines.
5. Venting inspection: Check PVC pipes for obstructions.

CAUTION! Always disconnect power before performing maintenance.

Regulatory Information

ANSI Z21.47/CSA 2.3: Certified for US and Canadian installation. UL 1995: Heating and cooling equipment. Meets Department of Energy efficiency standards. For technical support, contact 1-800-ABC-HEAT or visit www.carrier.com. Installation must comply with local building codes and utility requirements.

Troubleshooting

Reset: Power cycle furnace to clear temporary lockouts.

Service: 1-800-ABC-HEAT; www.carrier.com