Carrier Infinity Gas Furnace Installation Manual

The Carrier Infinity Gas Furnace is a high-efficiency heating system featuring variable-speed technology, modulating gas valve, advanced diagnostics, and compatibility with Carrier's Infinity Control system. This furnace offers superior comfort, quiet operation, and energy efficiency with AFUE ratings up to 98.5%. Below are key sections for safety, installation procedures, setup, operation, and troubleshooting.

Features at a Glance

Key components: Variable-speed blower motor, modulating gas valve, heat exchanger, pressure switches, igniter, flame sensor, and integrated control board.

Safety Precautions

Critical safety information for installation and operation.

1. Gas line connections: Use approved pipe thread compound and check for leaks with soap solution.
2. Electrical safety: Disconnect power before servicing; follow local electrical codes.
3. Venting requirements: Ensure proper vent sizing and slope; maintain clearances.
4. Combustion air: Provide adequate fresh air supply per local codes.
5. Carbon monoxide: Install CO detectors in living areas near sleeping quarters.

WARNING! Failure to follow safety procedures can result in fire, explosion, carbon monoxide poisoning, or electrical shock. Only qualified technicians should perform installation.

Installation Requirements

Pre-installation checklist and site preparation.

1. Location: Indoor, protected from weather, with adequate service clearance.
2. Clearances: Minimum 24 inches front, 6 inches sides, 6 inches rear, 24 inches top.
3. Foundation: Level, solid surface capable of supporting furnace weight.
4. Gas supply: Adequate pressure and volume; install shut-off valve.
5. Electrical: 120V, 60Hz dedicated circuit with proper grounding.
6. Ductwork: Properly sized and sealed; install filter rack.

CAUTION! Furnace is heavy; use proper lifting techniques and equipment.

Technical Specifications

• Model Series: 59MN7, 59TN6
• Input Capacity: 40,000 to 120,000 BTU/h
• AFUE Rating: Up to 98.5%
• Gas Type: Natural gas or LP (with conversion kit)
• Gas Pressure: Natural: 3.5" WC; LP: 10" WC
• Electrical: 120V, 60Hz, 15A circuit
• Blower Motor: Variable-speed ECM
• Venting: PVC, CPVC, or ABS (category IV)
• Sound Rating: As low as 65 dBA
• Dimensions: Varies by model (typical: 21"W x 25"D x 45"H)

Installation Procedures

Step-by-step installation guide.

1. Position furnace: Place on level surface with proper clearances.
2. Connect ductwork: Attach supply and return ducts; seal joints.
3. Install gas line: Use black iron pipe with drip leg and shut-off valve.
4. Connect venting: Install PVC vent pipes with proper slope and supports.
5. Electrical wiring: Connect line voltage and thermostat wiring.
6. Install condensate drain: Route to approved drain location.
7. Install air filter: Use proper size and MERV rating.

Tip: Check all connections for leaks before proceeding to startup.

Venting and Combustion Air

Venting system requirements and installation.

1. Vent pipe material: PVC, CPVC, or ABS Schedule 40.
2. Vent sizing: Follow manufacturer specifications for length and diameter.
3. Termination: Maintain proper clearances from windows, doors, and air intakes.
4. Combustion air: Provide separate intake or use direct vent configuration.
5. Slope: Vent pipes must slope back to furnace for condensate drainage.

WARNING! Improper venting can cause carbon monoxide buildup. Follow all local codes and manufacturer specifications.

Electrical Connections

Wiring diagrams and connection procedures.

1. Power supply: 120V, 60Hz, 15A dedicated circuit with disconnect.
2. Grounding: Proper equipment grounding required.
3. Thermostat wiring: Use 18-gauge stranded wire; connect to control board.
4. Humidifier: Optional connections available.
5. Safety switches: Install door interlock switch properly.

CAUTION! Always disconnect power before making electrical connections.

Startup and Commissioning

Initial startup procedures and system verification.

1. Gas pressure check: Verify inlet and manifold pressures.
2. Leak test: Check all gas connections with soap solution.
3. Vent verification: Confirm proper draft and vent operation.
4. Electrical check: Verify proper voltage and grounding.
5. System startup: Follow step-by-step startup sequence.
6. Performance test: Check temperature rise and combustion analysis.
7. Customer orientation: Explain operation and maintenance requirements.

Tip: Use combustion analyzer to verify proper operation and efficiency.

System Configuration

Infinity Control setup and system programming.

Control Features: Multi-stage operation, humidity control, ventilation management, system status, fault codes, and remote access capability.

Configuration: Set heating stages, fan operation, ventilation rates, and system preferences through Infinity Control interface.

Maintenance Guidelines

Routine maintenance procedures and schedules.

Monthly: Check air filter; replace when dirty.

Annual: Professional inspection including heat exchanger, burners, vent system, electrical components, and safety controls.

CAUTION! Only qualified technicians should perform internal maintenance. Always disconnect power and gas before servicing.

Troubleshooting

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

Service: Contact authorized Carrier dealer or 1-800-CARRIER; www.carrier.com