Armstrong Furnace User Manual

The Armstrong Furnace is a high-efficiency heating system designed for residential use, featuring advanced combustion technology, multiple heating stages, variable-speed blower motor, electronic ignition, built-in safety controls, programmable thermostat compatibility, and energy-saving operation modes. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Thermostat 7. Operating Modes 8. Maintenance Schedule 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Heat exchanger, blower assembly, gas valve, ignition system, control board, filter compartment, flue pipe connection, safety switches.

Feature	Description
Heat exchanger	Stainless steel construction for efficient heat transfer
Blower motor	Variable-speed ECM motor for quiet operation
Gas valve	Precise gas flow control with safety shutoff
Ignition system	Electronic hot surface ignition
Control board	Microprocessor-based for optimal operation
Filter compartment	Standard 1-inch or 4-inch media filter compatible
Flue connection	PVC pipe compatible for venting
Safety switches	Pressure switch, rollout switch, limit switch
POWER	Main power switch and circuit breaker
STATUS LIGHTS	LED indicators for system status and error codes

Installation

Unpack and inspect contents. Place on level surface in approved location.

Gas connection: Use approved gas pipe and fittings; pressure test for leaks.
Electrical connection: Connect to dedicated 120V circuit with proper grounding.
Vent system: Install PVC vent pipes according to local codes and manufacturer specifications.
Ductwork: Connect supply and return ducts securely with proper sealing.
Thermostat wiring: Connect low-voltage thermostat wires to control board.

WARNING! Installation must be performed by qualified HVAC technician. Gas leaks can cause explosion or fire.

First-Time Setup

Power on furnace; follow startup sequence.

System check: Verify all connections and clear installation area.
Gas pressure adjustment: Set manifold pressure according to specifications.
Blower speed settings: Adjust dip switches for proper airflow.
Thermostat programming: Set heating schedule and temperature limits.
Test operation: Run through complete heating cycle to verify performance.

CAUTION! Ensure proper ventilation and clearance around furnace. Keep combustible materials away.

Specifications

Heating Capacity: 40,000 to 120,000 BTU/h models available
Efficiency: Up to 96% AFUE
Stages: Single-stage, two-stage, or modulating operation
Blower Motor: Variable-speed ECM
Voltage: 120V AC, 60Hz
Gas Type: Natural gas or propane (conversion kit required)
Vent Material: PVC, CPVC, or ABS
Sound Level: As low as 65 dB
Warranty: Limited lifetime heat exchanger, 10 years parts

Controls and Settings

Access control board via front panel. Status lights indicate system operation and error codes.

Thermostat: HEAT/COOL/OFF mode, FAN AUTO/ON, temperature setpoint, program schedule, system status.

Heating: Single-stage, two-stage, or modulating heat output. Blower: Variable speed for optimal airflow and humidity control. Safety: Pressure switch monitoring, flame sensor, high-limit protection. Diagnostics: LED status lights with flash codes for troubleshooting.

Connecting Thermostat

Compatible with most 24V thermostats. Standard wiring: R (power), W (heat), G (fan), Y (cool), C (common).

Turn off power to furnace before wiring.
Match thermostat wires to control board terminals.
Use proper wire nuts and secure connections.
Program thermostat for heating operation.

Tip: Use programmable thermostat for maximum energy savings.

Operating Modes

Supports multiple heating modes for comfort and efficiency.

Single-stage: Basic on/off operation for consistent heating
Two-stage: Low-stage for mild weather, high-stage for cold weather
Modulating: Precise temperature control with variable gas valve and blower
Continuous fan: Circulates air without heating for improved air quality
Vacation mode: Reduced operation for energy savings during absence

WARNING! Do not block air vents or returns. Maintain proper airflow for safe operation.

Maintenance Schedule

Regular maintenance ensures optimal performance and safety.

Frequency	Maintenance Task
Monthly	Check and replace air filter if dirty
Seasonal	Inspect vent system for obstructions
Annual	Professional inspection and cleaning
Annual	Check gas pressure and combustion
Annual	Clean flame sensor and heat exchanger
Annual	Lubricate blower motor if required

Care & Cleaning

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

CAUTION! Do not use water or chemical cleaners on electrical components. Keep area around furnace clean and dry.

Regulatory Information

UL certified for safety standards. ANSI Z21.47 compliant for gas-fired central furnaces. Meets DOE energy efficiency requirements. Copyright © Armstrong Air Conditioning Inc. For support, visit www.armstrongair.com or contact 1-800-448-5872.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, safety switch	Check circuit breaker, thermostat setting, door switch
No heat	Gas supply, ignition, filter	Verify gas valve on, check for ignition failure, replace dirty filter
Short cycling	Dirty filter, airflow, overheating	Clean filter, check vents, verify proper airflow
Blower not working	Motor, capacitor, control board	Check blower door switch, motor capacitor, control board signals
Unusual noises	Loose parts, airflow, motor	Tighten components, check ductwork, inspect blower wheel

Reset: Turn power off for 30 seconds, then restart.

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