Ingersol Rand Model Number AUC1B080A9421AG Furnace Manual

The Ingersol Rand Model AUC1B080A9421AG is an 80,000 BTU high-efficiency gas furnace designed for residential heating applications. This upflow furnace features variable-speed blower technology, electronic ignition, multi-speed operation, and compatibility with standard thermostat systems. Below are key sections for safety, technical specifications, installation, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation Requirements 3. First-Time Setup 4. Technical Specifications 5. Controls and Operation 6. Venting and Combustion Air 7. Maintenance Procedures 8. Safety Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-efficiency heat exchanger, variable-speed blower motor, electronic ignition system, multi-position installation capability, integrated control board.

Feature	Description
Heat Exchanger	Stainless steel primary and secondary heat exchangers
Blower Motor	Variable-speed ECM motor for efficient operation
Ignition System	Hot surface electronic ignition
Gas Valve	Multi-stage gas valve for precise fuel control
Control Board	Integrated microprocessor control system
Filter System	Standard 1-inch filter slot
Venting	PVC venting compatible
Thermostat Connection	Standard 24V thermostat terminals
Safety Switches	Pressure switches, rollout switches, limit switches
Power Requirements	120V AC, 60Hz

Installation Requirements

Professional installation required. Verify local codes and obtain necessary permits.

Location: Install in clean, dry area with adequate clearance for service access.
Venting: Install PVC vent pipes according to manufacturer specifications.
Gas Connection: Use approved gas piping materials; pressure test before operation.
Electrical: Connect to dedicated 120V circuit with proper grounding.
Ductwork: Ensure proper sizing and sealing of supply and return ducts.

WARNING! Gas furnaces produce carbon monoxide; proper venting is critical. Installation must comply with all local codes and manufacturer specifications.

First-Time Setup

After installation, perform initial startup procedure.

Verify all connections: Gas, electrical, venting, and ductwork.
Install air filter: Ensure proper orientation and seating.
Power on: Turn on electrical power and gas supply.
Thermostat setup: Configure thermostat for furnace operation.
Test operation: Initiate heating cycle and verify proper operation.
Check venting: Verify proper draft and combustion.

CAUTION! Only qualified HVAC technicians should perform initial startup and testing.

Technical Specifications

Model: AUC1B080A9421AG
Heating Capacity: 80,000 BTU/H
Efficiency: 92% AFUE
Gas Type: Natural Gas
Gas Pressure: 3.5" W.C. manifold pressure
Blower Speeds: Multi-speed, adjustable
Electrical: 120V AC, 60Hz, 8.5 amps
Dimensions: 21" W x 21" D x 45" H
Venting: 2" PVC recommended
Weight: 125 lbs

Controls and Operation

Integrated control board manages all furnace functions. Access door switch interrupts power when door is removed.

Thermostat Operation: Standard 24V thermostat connection. Compatible with most single-stage and programmable thermostats.

Control Board LED: Flashing LED indicates operational status and error codes. Refer to diagnostic chart for code interpretation.

Blower Control: Variable-speed operation adjusts airflow based on heating demand for optimal efficiency and comfort.

Venting and Combustion Air

PVC venting system for direct vent operation. Requires separate combustion air and exhaust vents.

Vent Sizing: Minimum 2" PVC pipe for both intake and exhaust.
Vent Length: Maximum 40 feet equivalent length with two 90° elbows.
Termination: Vent terminals must be located according to code requirements.
Combustion Air: Ensure adequate fresh air supply for proper combustion.

Tip: Regularly inspect vent terminals for blockages from snow, ice, or debris.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

Monthly: Check and replace air filter as needed.
Annual: Professional inspection and cleaning recommended.
Blower Assembly: Clean blower wheel and housing annually.
Heat Exchanger: Visual inspection for cracks or damage.
Burners: Clean and inspect for proper flame pattern.
Venting: Inspect for obstructions or deterioration.
Electrical: Check all connections and components.
Gas Connections: Leak test at gas valve and manifold.

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

Safety Features

Multiple safety systems protect against hazardous conditions. Flame rollout switches, high limit switches, pressure switches, and door safety switch.

Care & Cleaning

Keep furnace area clean and free of combustible materials. Use soft brush and vacuum for cleaning internal components.

CAUTION! Never use water or liquid cleaners on electrical components. Always disconnect power before cleaning.

Regulatory Information

UL listed and ANSI certified. Complies with applicable safety standards. Manufactured to meet or exceed industry standards for residential gas furnaces. For technical support, contact Ingersol Rand at 1-800-647-4726 or visit www.ingersolrand.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check power supply; verify thermostat setting; ensure door properly closed.
No heat	Gas supply, ignition, filter	Verify gas valve open; check for ignition failure; replace dirty filter.
Blower won't run	Motor, capacitor, control board	Check motor operation; test capacitor; inspect control board.
Frequent cycling	Filter, limit switch, thermostat	Replace dirty filter; check limit switch; verify thermostat location.
Error codes flashing	Various system faults	Refer to diagnostic chart in service manual for specific code meaning.

Reset: Turn power off for 30 seconds, then restore to reset control board.

Service: 1-800-647-4726; www.ingersolrand.com