Infinity ICF Furnace Manual

The Infinity ICF Furnace is a high-efficiency gas furnace with variable-speed blower technology, modulating gas valve for precise temperature control, advanced diagnostics, compatibility with Infinity System control, quiet operation, and energy-saving features. Designed for residential heating with AFUE ratings up to 98%, it includes safety features like flame rollout switch, pressure switches, and ignitor system. 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 Thermostat 7. Operating Modes 8. Maintenance Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Variable-speed ECM blower motor, modulating gas valve, heat exchanger, control board, pressure switches, flame sensor, ignitor, filter access.

Feature	Description
Variable-speed blower	Adjusts airflow for efficiency and comfort
Modulating gas valve	Provides precise heat output in 1% increments
Heat exchanger	Stainless steel primary and secondary
Control board	Advanced diagnostics and system monitoring
Pressure switches	Safety verification of venting
Flame sensor	Detects burner flame presence
Hot surface ignitor	Electronic ignition system
Filter access	Easy slide-out filter compartment
Gas connection	1/2" NPT gas line connection
Electrical connection	120V AC, 60Hz power supply

Installation

Unpack and inspect contents. Position in approved location.

Gas line connection: Use approved pipe compound; pressure test for leaks.
Vent piping: Install according to local codes; maintain proper slope.
Electrical wiring: Connect to 120V circuit with proper grounding.
Thermostat connection: Use compatible Infinity control system.
Ductwork: Ensure proper sizing and sealing.

WARNING! Installation must be performed by qualified HVAC technician. Gas appliances can be hazardous if improperly installed.

First-Time Setup

Power on furnace; follow startup procedure.

System check: Control board performs self-diagnostic test.
Thermostat configuration: Program heating schedules and preferences.
Blower settings: Adjust airflow for home requirements.
Gas pressure: Verify proper manifold pressure settings.
Vent verification: Confirm proper draft and vent operation.

CAUTION! Ensure proper combustion air supply and clearances to combustibles.

Specifications

AFUE Rating: Up to 98% efficiency.
Heating Capacity: 40,000 to 120,000 BTU/h models available.
Blower Motor: Variable-speed ECM technology.
Gas Type: Natural gas or LP (with conversion kit).
Electrical: 120V AC, 60Hz, 15 amp circuit.
Control System: Compatible with Infinity thermostat.
Sound Level: As low as 65 dBA.
Vent Size: 2" to 3" PVC depending on model.
Warranty: Limited lifetime heat exchanger warranty.

Controls and Settings

Access settings via Infinity control thermostat. Control board LED for diagnostics.

Thermostat Controls: Temperature setpoint, fan control, system mode, scheduling, humidity control.

Heating: Single-stage or modulating operation. Fan: Auto or continuous operation. Advanced: Dehumidification, air cleaning, zoning. Diagnostics: LED error codes, system status, maintenance reminders.

Connecting Thermostat

Infinity Control System: 6-wire communication cable.

Turn off power to furnace before wiring.
Route thermostat cable from furnace to thermostat location.
Connect wires to designated terminals on control board.
Mount thermostat and restore power.
Follow thermostat setup wizard.

Tip: Use shielded cable for longer runs to prevent interference.

Operating Modes

Heating, fan only, system off.

Heating mode: Furnace responds to thermostat heat demand.
Modulating operation: Adjusts flame and blower for precise temperature.
Fan operation: Continuous or circulating fan modes available.
Standby: System ready but not actively heating.
Safety shutdown: Automatic shutdown if fault detected.

WARNING! Do not block return or supply air registers. Maintain clear combustion air intake.

Maintenance Features

Filter reminder: Programmable filter change indicator. Self-diagnostics: LED fault codes for troubleshooting. Service alerts: Notifies when professional service required.

Care & Cleaning

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

CAUTION! Annual professional maintenance recommended. Do not attempt to clean heat exchanger or burners.

Regulatory Information

ANSI Z21.47: Certified for safety standards. UL listed. Energy Star qualified. Complies with Department of Energy efficiency standards. Copyright © Carrier Corporation; Infinity is a registered trademark. For support, visit www.carrier.com or contact 1-800-CARRIER.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace not starting	Power/thermostat	Check circuit breaker; verify thermostat settings; check filter.
No heat	Gas supply/ignition	Verify gas valve on; check pilot/ignitor; review error codes.
Blower not running	Motor/control	Check blower door switch; verify control board power.
Short cycling	Filter/venting	Replace dirty filter; check for blocked vents or registers.
Error codes displayed	System fault	Reference LED flash codes in service manual; call technician.

Reset: Power cycle furnace; clear error codes if safe to do so.

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