Armstrong Ultra 80 Furnace Manual

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

1. Features at a Glance 2. Installation Requirements 3. First-Time Startup 4. Technical Specifications 5. Controls and Settings 6. Venting and Combustion Air 7. Operating Instructions 8. Maintenance Procedures 9. Safety Information 10. Regulatory Compliance 11. Troubleshooting Guide

Features at a Glance

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

Feature	Description
Heat Exchanger	Aluminized steel clamshell design for durability
Ignition System	Electronic hot surface ignition (no standing pilot)
Blower Motor	Permanent split capacitor multi-speed
Draft System	Induced draft combustion blower
Gas Valve	Single-stage automatic gas valve
Safety Controls	Limit switches, pressure switches, flame sensor
Filter System	Standard 1-inch filter slot
Electrical	120V AC, 60Hz operation
Venting	Category I venting (B-vent compatible)
Thermostat Connection	Standard 24V thermostat terminals

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

Location: Install in approved locations with proper clearances to combustibles.
Venting: Install approved Category I vent system with proper slope and termination.
Gas Supply: Connect to properly sized gas line with sediment trap and shut-off valve.
Electrical: Connect to dedicated 120V circuit with proper grounding.
Ductwork: Ensure proper return and supply duct sizing and sealing.

WARNING! Gas furnaces produce carbon monoxide. Proper installation and venting are critical for safety. Installation must comply with NFPA 54/ANSI Z223.1 and local codes.

First-Time Startup

Initial startup must be performed by qualified technician.

Verify installation: Check all connections, clearances, and venting.
Gas pressure check: Measure and adjust manifold gas pressure to specifications.
Electrical check: Verify proper voltage and polarity.
System check: Test ignition sequence, flame proving, and safety controls.
Combustion analysis: Verify proper combustion and vent operation.
Blower adjustment: Set appropriate blower speeds for heating mode.

CAUTION! Never attempt to adjust gas pressure without proper training and equipment.

Technical Specifications

AFUE Rating: Up to 80% Annual Fuel Utilization Efficiency
Input Capacity: 40,000 to 120,000 BTU/hr models available
Gas Type: Natural gas or propane (conversion kit required)
Electrical: 120V AC, 60Hz, 5-8 amps depending on model
Blower Capacity: 800-1600 CFM depending on model and speed tap
Static Pressure: Maximum 0.8 inches water column
Vent Size: 4-inch to 7-inch diameter depending on model
Filter Size: Standard 16x25x1 inch or as specified
Sound Rating: Ultra-quiet operation with insulated cabinet

Controls and Settings

Integrated control board manages all furnace operations with LED status indicator.

Control Board: Monitors safety devices, controls ignition sequence, manages blower operation, provides diagnostic codes via LED flash patterns.

Blower Speed Taps: Multiple speed selections for heating operation (typically labeled HEAT, COOL, FAN). Gas Valve Adjustment: Factory set - do not adjust without proper training. Limit Switches: Automatic high-temperature protection. Pressure Switches: Verify proper venting operation. Flame Sensor: Proves flame during operation.

Venting and Combustion Air

Proper venting is critical for safe operation and efficiency.

Vent System: Use approved Category I vent materials with proper slope toward furnace.
Vent Termination: Locate according to local codes (typically 12 inches minimum from openings).
Combustion Air: Provide adequate combustion and ventilation air per local codes.
Vent Clearances: Maintain proper clearances to combustibles as specified.

Tip: Inspect vent system annually for obstructions, deterioration, or damage.

Operating Instructions

Normal operation is controlled by thermostat.

Thermostat Setting: Set thermostat to desired temperature and HEAT mode.
Startup Sequence: Control board initiates draft inducer, checks safety controls, ignites burners.
Normal Operation: Burners heat heat exchanger, blower circulates warm air through ducts.
Shutdown Sequence: Burners extinguish, blower continues for post-purge cooling.
Fan Operation: Use thermostat FAN setting for continuous or automatic blower operation.

WARNING! If you smell gas, immediately turn off gas supply, evacuate area, and call gas company or fire department.

Maintenance Procedures

Regular maintenance ensures efficiency, reliability, and safety.

Monthly: Check and replace air filter as needed.
Annual Professional Service: Clean burners, heat exchanger, and blower assembly.
Inspect vent system: Check for obstructions or deterioration.
Check safety controls: Verify proper operation of all safety devices.
Lubrication: Most models have permanently lubricated bearings (verify specific model).

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

Safety Information

Carbon monoxide detectors required in all homes with fuel-burning appliances.

WARNING SIGNS: Soot around furnace, moisture on windows, unfamiliar odors, chronic illness symptoms. If furnace fails to ignite after several attempts, locks out and requires professional service.

Regulatory Information

UL listed and certified to ANSI Z21.47/CSA 2.3 standards. Manufactured to comply with U.S. Department of Energy efficiency standards. For technical support or warranty service, contact Armstrong Air Conditioning Inc. at 1-800-448-5872 or visit www.armstrongair.com.

Troubleshooting Guide

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat setting, ensure door properly closed.
No heat	Gas supply, ignition	Verify gas valve on, check for locked-out control board (LED code).
Short cycling	Filter, limit switch	Replace dirty filter, check for restricted airflow or overheating.
Blower doesn't run	Motor, capacitor, control	Check for power to blower, inspect capacitor, verify control signal.
Unusual noises	Motor, blower wheel	Inspect for loose components, debris in blower, worn bearings.
Burners won't stay lit	Flame sensor	Clean flame sensor with emery cloth (power off).

Reset Procedure: Turn thermostat off, turn off power for 30 seconds, restore power, turn thermostat on.

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