Carrier Infinity Furnace Manual

The Carrier Infinity Furnace is a high-efficiency gas furnace featuring advanced modulating technology, Infinity System control, variable-speed blower motor, durable heat exchanger, quiet operation, and compatibility with Carrier Infinity thermostats for precise temperature control and energy savings. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Components 7. Operation 8. Maintenance Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Modulating gas valve, variable-speed blower, Infinity control board, heat exchanger, pressure switches, ignitor, flame sensor.

Feature	Description
Modulating gas valve	Provides precise fuel control for consistent comfort
Variable-speed blower	Adjusts airflow for optimal efficiency and quiet operation
Infinity control board	Advanced diagnostics and system communication
Stainless steel heat exchanger	Durable construction for long-lasting performance
Pressure switches	Safety devices to verify proper venting
Hot surface ignitor	Reliable electronic ignition system
Flame sensor	Monitors burner operation for safety
Gas valve	Controls natural gas or propane flow
Blower compartment	Houses circulating air fan and motor
Filter access	Easy replacement of air filters

Installation

Unpack and inspect contents. Position in approved location.

Gas connection: Use approved pipe and fittings; pressure test for leaks.
Electrical connection: Connect to 120V power supply; proper grounding required.
Vent system: Install approved PVC vent pipes per local codes.
Drain line: Connect condensate drain to proper disposal.
Air filter: Install appropriate size filter in filter rack.

WARNING! Gas furnaces produce carbon monoxide; proper venting is critical. Installation must comply with local codes and be performed by qualified technician.

First-Time Setup

Power on furnace; follow startup procedure.

System check: Verify all connections secure and gas valve open.
Thermostat setup: Program Infinity thermostat for desired settings.
Blower settings: Adjust airflow for home requirements.
Gas pressure: Verify correct manifold pressure settings.
Test operation: Run through complete heating cycle.

CAUTION! Ensure proper combustion air supply; maintain clearances to combustibles.

Specifications

Fuel Type: Natural gas or propane
Efficiency: Up to 98% AFUE
Heating Capacity: 40,000 to 120,000 BTU/h
Blower Motor: Variable-speed ECM
Sound Level: As low as 65 dB
Control System: Carrier Infinity
Vent Material: PVC approved
Electrical: 120V, 60Hz
Warranty: Limited lifetime heat exchanger

Controls and Settings

Access system via Infinity thermostat or control board.

Thermostat: POWER, MODE, FAN, TEMP adjustment, MENU, SYSTEM status.

Heating: Setpoint temperature, system mode, fan control. Advanced: Dehumidification, ventilation, scheduling. Diagnostics: Error codes, system status, maintenance alerts. Installation: Configure for specific home requirements, airflow settings.

Connecting Components

Gas line: Black iron pipe with sediment trap. Electrical: 120V power, thermostat wiring. Vent: PVC pipes for intake and exhaust. Drain: PVC pipe for condensate removal.

Turn off gas and electrical power before connecting.
Use proper pipe dope or tape on gas connections.
Verify vent pipe slope for proper drainage.
Connect thermostat wires to correct terminals.

Tip: Label all wires during installation for easy identification.

Operation

Supports continuous heating with modulating operation.

Startup: Set thermostat to HEAT mode and desired temperature.
Ignition: System performs self-check then ignites burners.
Modulation: Gas valve adjusts flame height for precise temperature control.
Blower operation: Variable-speed motor ramps up for optimal airflow.
Shutdown: System completes cycle and enters standby mode.
Fan control: Choose AUTO or continuous fan operation.
Setback: Program thermostat for energy savings during unoccupied periods.
Alerts: Monitor system status for maintenance requirements.

WARNING! Never block return or supply air registers; maintain clear airflow paths.

Maintenance Features

Filter reminder: Programmable interval for filter changes. Diagnostic codes: LED flashes indicate specific issues. Service alerts: Advanced warning for maintenance requirements.

Care & Cleaning

Turn off power before servicing. Replace air filters regularly. Keep area around furnace clean and unobstructed.

CAUTION! Do not attempt internal cleaning; contact qualified technician for annual maintenance.

Regulatory Information

ANSI Z21.47: Certified for gas furnace safety standards. UL 1995: Heating and cooling equipment. Copyright © 2025 Carrier Corporation; trademarks of Carrier Global Corporation. For support, visit www.carrier.com or contact 1-800-CARRIER.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power/thermostat	Check circuit breaker; verify thermostat settings; ensure gas valve open.
No heat	Ignition/pressure	Check for error codes; verify gas supply; inspect pressure switches.
Short cycling	Filter/airflow	Replace dirty filter; check for blocked vents; verify proper airflow.
Blower not working	Motor/control	Check blower door switch; verify motor operation; inspect control board.
Error codes displayed	System fault	Reference code in manual; reset if possible; contact technician if persistent.

Reset: Thermostat > Menu > System > Reset if available.

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