Carrier Infinity Furnace Owners Manual

The Carrier Infinity Furnace is a high-efficiency gas furnace featuring variable-speed technology, Infinity System control compatibility, quiet operation, diagnostic LED lights, multiple heating stages, and advanced air filtration. Designed for residential heating with AFUE ratings up to 98.5%, it includes safety features, self-diagnostics, and compatibility with Carrier's Infinity thermostat for optimal comfort control. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting to HVAC System 7. Operating Modes 8. Maintenance Procedures 9. Safety Features 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Variable-speed blower motor, heat exchanger, gas valve, ignition system, air filter compartment, diagnostic LED, pressure switches, and Infinity control compatibility.

FeatureDescription
Variable-speed technologyAdjusts blower speed for optimal efficiency and comfort
Infinity System controlCompatible with Carrier Infinity thermostat for precise temperature control
Quiet operationSound-absorbing insulation and variable-speed motor reduce noise
Diagnostic LEDDisplays error codes for troubleshooting
Multiple heating stagesAdapts output to heating demand for energy efficiency
Advanced air filtrationCompatible with high-efficiency filters for improved air quality
Safety shutoffAutomatic gas valve shutoff in case of system fault
Self-diagnosticsMonitors system performance and detects issues
High AFUE ratingUp to 98.5% Annual Fuel Utilization Efficiency
Dual-fuel capabilityCompatible with heat pump systems (select models)

Installation Requirements

Professional installation required. Ensure proper location and clearances.

  1. Location: Install in well-ventilated area with adequate combustion air.
  2. Clearances: Maintain minimum clearances per local codes (typically 1 inch from combustible materials).
  3. Venting: Use approved PVC or metal venting materials as specified.
  4. Gas connection: Use black iron pipe with proper sizing; pressure test required.
  5. Electrical: 120V AC power supply with proper grounding.
  6. Drain line: Install condensate drain with proper trap and routing.

WARNING! Installation must be performed by qualified HVAC technician. Improper installation can cause fire, explosion, or carbon monoxide poisoning.

First-Time Setup

Initial startup must be performed by qualified technician.

  1. System check: Verify all connections, gas pressure, and electrical wiring.
  2. Venting verification: Confirm proper draft and venting configuration.
  3. Control setup: Program Infinity thermostat for heating schedules and preferences.
  4. Test operation: Run through complete heating cycle to verify performance.
  5. Customer orientation: Explain basic operation and maintenance requirements.

CAUTION! Do not attempt first-time startup without proper training and equipment.

Specifications

Controls and Settings

Primary control through Infinity thermostat. Furnace includes diagnostic LED and service switches.

Infinity Thermostat: Temperature setting, fan control, system mode, scheduling, system status, error codes.

Furnace Controls: Power switch, diagnostic LED (flashing codes indicate system status), gas valve, pressure switches, limit switches, igniter control. Settings: Temperature setpoints, fan operation (auto/on), heating stages, filter reminder, system alerts.

Connecting to HVAC System

Integration with existing ductwork, thermostat, and air conditioning system.

  1. Duct connection: Secure to supply and return plenums with proper sealing.
  2. Thermostat wiring: Connect to Infinity control system with communication wiring.
  3. AC compatibility: Works with Carrier matching air conditioning coils.
  4. Humidifier: Compatible with Aprilaire or Carrier humidification systems.
  5. Air cleaner: Supports electronic or media air cleaners.

Tip: Ensure all system components are Carrier-matched for optimal performance.

Operating Modes

Multiple operating modes for comfort and efficiency.

  1. Heating mode: Provides warm air through duct system.
  2. Fan only: Circulates air without heating.
  3. Standby: System ready but not actively heating.
  4. Service mode: For technician diagnostics and testing.
  5. Dual-fuel mode: Coordinates with heat pump (if equipped).

WARNING! Do not operate furnace if smell of gas is present. Evacuate and call gas company immediately.

Maintenance Procedures

Regular maintenance ensures efficiency and longevity.

  1. Filter replacement: Change every 1-3 months depending on filter type and usage.
  2. Annual inspection: Schedule professional maintenance before heating season.
  3. Visual check: Look for soot, corrosion, or water leakage.
  4. Venting inspection: Ensure vent pipes are clear and properly connected.
  5. Drain system: Check condensate drain for clogs and proper flow.

CAUTION! Turn off power and gas supply before performing any maintenance.

Safety Features

Multiple safety systems protect against hazardous conditions.

Safety FeatureFunction
Flame rollout switchesDetect improper burner operation
High limit switchPrevents overheating
Pressure switchesVerify proper venting operation
Ignition controlMonitors flame sensing
Gas valveAutomatic shutoff in fault conditions
Carbon monoxide detectionCompatible with CO detectors

Regulatory Information

UL certified; meets ANSI Z21.47 standards for gas-fired central furnaces. CSA certified in Canada. Complies with U.S. Department of Energy efficiency standards. Manufactured by Carrier Corporation. For support, visit www.carrier.com or contact 1-800-CARRIER. Installation must comply with National Fuel Gas Code NFPA 54/ANSI Z223.1 and local building codes.

Troubleshooting

SymptomPossible CauseCorrective Action
Furnace not startingPower, thermostat, gas supplyCheck circuit breaker, thermostat setting, gas valve position
No heatPilot/ignition, filter, limit switchCheck for ignition failure, replace dirty filter, reset limit switch
Short cyclingFilter, airflow, thermostat locationClean/replace filter, check registers, relocate thermostat
Blower not runningPower, motor, control boardCheck power to blower, motor capacitor, control board signals
Unusual noisesMotor, blower wheel, ductworkLubricate motor (if applicable), check for obstructions, secure ducts
Error codes displayedSystem faultsRefer to diagnostic chart in service manual; call for service if needed

Reset: Turn power off for 30 seconds, then restore. Check diagnostic LED for code.

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

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