Carrier Infinity 96 Furnace Owners Manual

The Carrier Infinity 96 Furnace is a high-efficiency gas furnace with variable-speed technology, modulating gas valve, and advanced diagnostic capabilities. This furnace features up to 96% AFUE efficiency, quiet operation, compatibility with Carrier's Infinity System Control, and advanced humidity 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. System Operation 7. Maintenance Procedures 8. Safety Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

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

Feature	Description
Variable-speed blower	Provides precise airflow control and quiet operation
Modulating gas valve	Adjusts gas flow from 40% to 100% capacity
Heat exchanger	Stainless steel construction for durability
Ignition system	Hot surface ignition for reliable startup
Air filter	Standard 1-inch or optional 4-inch media filter
Pressure switches	Ensures proper venting operation
Diagnostic LED	Displays error codes for troubleshooting
Infinity System Control	Advanced thermostat compatibility
Humidity control	Maintains optimal indoor humidity levels
Quiet operation	Sound-absorbing insulation and rubber isolation

Installation Requirements

Professional installation required. Ensure proper clearances and venting.

Location: Install in dry, clean area with proper clearances (minimum 1 inch from combustible materials).
Venting: Use approved PVC pipe for intake and exhaust; maintain proper slope.
Gas connection: Use black iron pipe with proper thread sealant; pressure test required.
Electrical: 120V AC power supply with proper grounding.
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.

System check: Verify all connections, gas pressure, and electrical wiring.
Venting verification: Confirm proper draft and vent pipe installation.
Gas pressure adjustment: Set manifold pressure to specifications.
Airflow configuration: Set blower speeds for proper CFM delivery.
Control setup: Program Infinity Control thermostat for optimal operation.

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

Specifications

Model Series: 59MN7A, 59MN7B
AFUE Efficiency: Up to 96%
Heating Capacity: 40,000 to 120,000 BTU/h
Stages: Fully modulating (40-100%)
Blower Type: Variable-speed ECM
Voltage: 120V AC, 60Hz
Gas Type: Natural gas (LP conversion kit available)
Venting: PVC pipe (2-inch minimum)
Sound Level: As low as 65 dBA
Warranty: 20-year heat exchanger, 5-year parts

Controls and Settings

Access system settings through Infinity Control thermostat. Furnace control board provides diagnostic LED codes.

Infinity Control Features: Temperature setting, fan control, system mode, humidity control, scheduling, system status, error codes.

Basic Settings: Temperature setpoint, fan mode (Auto/On), system mode (Heat/Off), humidity setpoint. Advanced Settings: Blower speed adjustments, staging parameters, filter reminder, service alerts.

System Operation

Normal heating cycle operation and system behavior.

Call for heat: Thermostat signals furnace to begin heating cycle.
Pre-purge: Blower operates to clear combustion chamber.
Ignition: Hot surface igniter glows, gas valve opens.
Heating: Modulating gas valve adjusts flame, blower circulates warm air.
Post-purge: Blower continues after gas valve closes to remove residual heat.

Tip: System may operate at lower stages for extended periods for maximum efficiency and comfort.

Maintenance Procedures

Regular maintenance ensures optimal performance and efficiency.

Monthly: Check and replace air filter as needed.
Seasonal: Inspect vent pipes for obstructions.
Annual: Professional inspection and cleaning required.
Blower compartment: Clean annually (professional service).
Drain system: Flush condensate trap and drain line.
Heat exchanger: Visual inspection for cracks or damage.

WARNING! Turn off power and gas supply before performing any maintenance. Some procedures require qualified technician.

Safety Features

Multiple safety systems protect against hazardous conditions.

Safety Feature	Function
Flame rollout switches	Detects improper burner operation
Pressure switches	Ensures proper venting operation
High limit switch	Prevents overheating
Ignition control	Monitors flame sensing
Gas valve	Automatic shutoff if no flame detected

Care & Cleaning

Turn off power before cleaning. Use soft brush and vacuum for dust removal.

CAUTION! Do not use water or liquid cleaners. Keep area around furnace clear of combustible materials.

Regulatory Information

UL certified; meets ANSI Z21.47 standards. CSA design certified. Complies with U.S. Department of Energy efficiency standards. Manufactured by Carrier Corporation. For support, visit www.carrier.com or contact 1-800-CARRIER. Copyright © 2023 Carrier Corporation. All rights reserved.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace not starting	Power, thermostat, gas supply	Check circuit breaker, thermostat settings, gas valve position.
No heat	Filter, ignition, gas	Replace filter, check for ignition attempts, verify gas supply.
Short cycling	Filter, airflow, limit switch	Clean filter, check vents and returns, inspect limit switch.
Blower not running	Power, motor, control	Check power to blower, motor capacitor, control board signals.
Error codes displayed	Various system faults	Refer to diagnostic chart in service manual; call for service if needed.

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

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