Armstrong Air Furnace Installation Manual

The Armstrong Air Furnace is a high-efficiency heating system designed for residential and light commercial applications. This manual covers installation procedures, safety requirements, electrical connections, gas line connections, venting systems, startup procedures, and maintenance guidelines for proper furnace operation and longevity.

1. Safety Precautions 2. Pre-Installation Requirements 3. Unit Specifications 4. Installation Location 5. Venting System 6. Gas Line Connection 7. Electrical Wiring 8. Ductwork Connection 9. Startup Procedure 10. Maintenance Schedule 11. Troubleshooting

Safety Precautions

Critical safety information for proper furnace installation and operation.

Hazard	Precaution
Gas Leaks	Check all connections with leak detection solution
Electrical Shock	Disconnect power before servicing
Carbon Monoxide	Ensure proper venting and combustion air
Fire Hazard	Maintain clearance from combustible materials
Burn Hazard	Allow unit to cool before servicing

Pre-Installation Requirements

Essential preparations before beginning furnace installation.

Verify local codes and obtain necessary permits
Check furnace model matches job requirements
Inspect unit for shipping damage
Ensure adequate clearance around installation area
Confirm proper gas supply and electrical service

WARNING! Installation must be performed by qualified HVAC technician only.

Unit Specifications

Model Series: A95UH1, A80UH1, A70UH1
Input Capacity: 40,000 - 120,000 BTU/H
Efficiency: 80% - 95% AFUE
Gas Type: Natural Gas or Propane
Electrical: 115V/60Hz/1Ph
Venting: Category I or IV depending on model
Dimensions: Varies by model (check specific unit)
Weight: 85 - 150 lbs

Installation Location

Proper furnace placement is critical for safety and performance.

Indoor locations only - protected from weather
Minimum clearance: 1" sides, 6" front, 24" top
Adequate combustion air supply required
Level, solid foundation capable of supporting unit weight
Accessible for service and maintenance

CAUTION! Do not install in corrosive atmosphere or where flammable vapors may be present.

Venting System

Proper venting is essential for safe operation.

Vent Type	Requirements
Category I	B-vent, minimum 3" diameter
Category IV	PVC/CPVC, sealed joints, proper slope
Common Vent	Follow manufacturer specifications
Direct Vent	Separate intake and exhaust

Tip: All vent joints must be sealed with approved high-temperature cement.

Gas Line Connection

Gas piping must meet local code requirements.

Install sediment trap upstream of gas valve
Use pipe thread sealant approved for gas service
Support piping independently from furnace
Install manual shut-off valve within 6 feet of unit
Pressure test system at 14" W.C. for 10 minutes

WARNING! Never use matches or open flame to check for gas leaks.

Electrical Wiring

Electrical connections must comply with NEC and local codes.

Disconnect power before making connections
Use copper conductors only
Install dedicated 15-amp circuit
Connect ground wire to furnace chassis
Verify proper voltage at unit (115V ±10%)
Connect thermostat wiring per diagram

CAUTION! Incorrect wiring can damage controls and create fire hazard.

Ductwork Connection

Proper ductwork ensures efficient airflow and performance.

Seal all duct connections with approved tape or mastic
Install filter rack with proper size filter
Ensure return air duct is properly sized
Provide adequate support for duct connections
Balance system for proper airflow

Startup Procedure

Follow these steps for initial furnace startup.

Verify all connections are complete and secure
Open gas supply valve
Restore electrical power
Set thermostat to call for heat
Check ignition sequence and flame
Measure temperature rise (30-60°F typical)
Verify proper venting operation
Check for gas leaks at all connections

WARNING! If unit fails to ignite after three attempts, wait 5 minutes before retrying.

Maintenance Schedule

Regular maintenance ensures optimal performance and safety.

Frequency	Maintenance Task
Monthly	Inspect/change air filter
Annually	Clean burners and heat exchanger
Annually	Check gas pressure and combustion
Annually	Inspect vent system
Annually	Lubricate blower motor (if required)

Troubleshooting

Symptom	Possible Cause	Corrective Action
No heat	Power, thermostat, gas supply	Check circuit breaker, thermostat setting, gas valve
Short cycling	Dirty filter, airflow restriction	Replace filter, check ductwork, verify blower operation
Blower runs continuously	Thermostat fan setting	Set thermostat fan to AUTO position
Unusual odors	Dust buildup, electrical issue	Clean components, inspect electrical connections
Ignition failure	Gas supply, igniter, flame sensor	Check gas pressure, replace igniter, clean flame sensor

Service: Contact authorized Armstrong Air dealer for technical support

Warranty: Register product within 60 days of installation