Armstrong Air Ultra 80 Furnace Manual

The Armstrong Air Ultra 80 is a high-efficiency gas furnace with 80% AFUE rating, featuring single-stage operation, durable heat exchanger, electronic ignition, multi-speed blower motor, built-in draft inducer, and comprehensive safety controls. Designed for residential heating applications with natural gas or propane capability. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Durable aluminized steel heat exchanger, hot surface ignition, induced draft combustion system, multi-speed PSC blower motor, integrated control board.

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

1. Location: Install in upright position with proper clearances (minimum 1 inch from combustible materials).
2. Gas Connection: Use black iron pipe with proper thread sealant. Test for leaks with soap solution.
3. Electrical: 120V AC, 60Hz power supply with dedicated 15-amp circuit.
4. Venting: Install PVC vent pipes according to manufacturer specifications.
5. Drain Line: Connect condensate drain to suitable drain or condensate pump.

WARNING! Gas furnaces produce carbon monoxide. Proper installation and venting are critical for safety.

First-Time Startup

Qualified technician must perform initial startup and commissioning.

1. Verify installation: Check all connections, clearances, and venting.
2. Electrical power: Turn on furnace disconnect and thermostat.
3. Gas supply: Open main gas valve and appliance shutoff valve.
4. System check: Follow control board startup sequence and verify proper operation.
5. Combustion analysis: Measure flue gas temperatures and CO levels.
6. Customer orientation: Explain operation, filter changes, and basic maintenance.

CAUTION! Never attempt furnace startup without proper training and equipment.

Technical Specifications

• Model Series: Ultra 80 (U80C, U80E)
• AFUE Rating: 80%
• Input BTU/H: 40,000 - 120,000 (varies by model)
• Output BTU/H: 32,000 - 96,000 (80% of input)
• Gas Type: Natural gas or propane (conversion kit required)
• Electrical: 120V AC, 60Hz, 5-8 amps
• Blower Speeds: Multi-speed for heating and continuous fan
• Static Pressure: 0.5 inches w.c. maximum
• Vent Size: 2-inch or 3-inch PVC
• Dimensions: Varies by model (typically 21"W x 21"D x 45"H)

Controls and Settings

Integrated furnace control board with diagnostic LED. Thermostat connections: R, W, G, Y, C.

Control Board LED Codes: Steady green = normal operation, Slow flash = pressure switch error, Rapid flash = ignition failure, Continuous off = no power.

Blower Speeds: Heating speed set at installation, Continuous fan speed adjustable. Temperature Rise: Verify within range on unit rating plate (typically 35-65°F). Gas Pressure: Natural gas 3.5" w.c., Propane 10" w.c. (adjust by qualified technician).

Venting and Combustion Air

Direct vent or conventional vent options available.

1. Direct Vent: Use PVC pipes for intake and exhaust (2-inch minimum).
2. Conventional Vent: Metal B-vent required with proper clearances.
3. Combustion Air: Provide adequate fresh air per local codes.
4. Vent Termination: Locate away from windows, doors, and air intakes.
5. Pitch: Vent pipes must slope back toward furnace for condensate drainage.

Tip: Always verify vent system integrity before operation.

Operation Instructions

Standard heating operation with thermostat control.

1. Thermostat Setting: Set to HEAT mode and desired temperature.
2. Normal Sequence: Thermostat calls for heat, inducer starts, pressure switch proves, igniter heats, gas valve opens, flame established, blower starts after delay.
3. Shutdown: Thermostat satisfied, gas valve closes, inducer runs for post-purge, blower continues for cool-down.
4. Continuous Fan: Set thermostat fan to ON for continuous circulation.
5. Seasonal Startup: Annual inspection recommended before heating season.

WARNING! If you smell gas, evacuate immediately and call gas company from outside.

Maintenance Procedures

Regular maintenance ensures efficiency and safety.

• Monthly: Check and replace air filter as needed.
• Annual: Professional inspection and cleaning.
• Blower: Clean blower wheel and housing annually.
• Heat Exchanger: Visual inspection for cracks or corrosion.
• Vent System: Check for obstructions and proper drainage.
• Drain Lines: Clear condensate drain and trap.
• Safety Devices: Test rollout switches and pressure switch.

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

Safety Information

Carbon monoxide detectors required in home. Keep combustibles away from furnace.

Emergency Shutdown: Turn off gas valve at furnace, turn off electrical power, call qualified technician.

Fire Hazard: Maintain clearances to combustibles. Never store flammable materials near furnace.

Regulatory Compliance

UL listed and ANSI Z21.47 compliant. Meets U.S. Department of Energy efficiency standards. Manufactured to comply with applicable safety and performance standards. For technical support, contact Armstrong Air at 1-800-448-5872 or visit www.armstrongair.com.

Troubleshooting Guide

Reset Procedure: Turn off power for 30 seconds, then restore.

Service: 1-800-448-5872; www.armstrongair.com