armstrong furnace manual pdf

The Armstrong Furnace is a high-efficiency heating system designed for residential and light commercial applications. This manual covers installation, operation, maintenance, and troubleshooting for various Armstrong furnace models. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

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

Features at a Glance

Key components: High-efficiency heat exchanger, Electronic ignition system, Multi-speed blower motor, Thermostat interface, Safety shut-off switches, Filter access panel.

Feature	Description
Heat Exchanger	Stainless steel construction for maximum efficiency
Ignition System	Electronic hot surface ignition
Blower Motor	Multi-speed ECM motor for optimal airflow
Thermostat Connection	Standard 24V thermostat interface
Safety Switches	Rollout and limit switches for protection
Filter Access	Easy-access front panel for filter replacement
Gas Valve	Electronic modulating gas valve
Control Board	Microprocessor-based control system
Vent System	PVC venting compatible
Drain Connection	Condensate drain port for high-efficiency models

Installation

Unpack and inspect all components. Ensure proper location with adequate clearance.

Position furnace: Place on stable, level surface with proper clearances.
Connect gas supply: Use approved gas piping and fittings.
Connect electrical: Follow local electrical codes for power connection.
Install venting: Use approved PVC or metal vent materials.
Connect thermostat: Use 18-gauge thermostat wire.

WARNING! Gas appliances require professional installation. Ensure all connections are leak-tested and secure.

First-Time Setup

Power on furnace; follow startup sequence.

Verify gas supply: Ensure gas valve is open and pressure is correct.
Check electrical: Confirm proper voltage at unit.
Set thermostat: Program desired temperature settings.
Test operation: Initiate heating cycle and verify proper function.
Adjust blower speed: Set appropriate CFM for duct system.

CAUTION! Only qualified technicians should perform initial setup and adjustments.

Specifications

Heating Capacity: 40,000 - 120,000 BTU/H
Efficiency: 80% - 96% AFUE
Electrical: 120V AC, 60Hz, 15A circuit
Gas Type: Natural gas or LP (conversion kit required)
Blower Motor: ECM or PSC multi-speed
Dimensions: Varies by model (typical: 21"W x 21"D x 45"H)
Vent Size: 2" - 3" PVC or metal
Filter Size: 16x25x1 or 20x25x1 standard
Warranty: 20-year heat exchanger, 5-year parts

Controls and Settings

Access control board via front panel. Integrated LED status lights for diagnostics.

Thermostat: HEAT/COOL/OFF, FAN AUTO/ON, Temperature setting, Program schedules.

Furnace Controls: Power switch, Gas valve, Blower speed taps, Limit switches, Pressure switches, Control board dip switches. Settings: Temperature rise, Blower delay, CFM settings, Gas pressure adjustment.

Connecting Components

Gas line: Black iron pipe with sediment trap. Electrical: Dedicated circuit. Vent: PVC piping. Thermostat: 5-7 wire connection.

Turn off power and gas before connecting components.
Match connections to specifications (gas, electrical, vent).
Test all connections for leaks and proper operation.

Tip: Use pipe compound on gas threads and electrical tape on wire connections.

Operating Procedures

Standard heating operation with automatic safety monitoring.

Startup: Set thermostat to HEAT mode above room temperature.
Ignition sequence: Inducer motor starts, pressure switch proves, igniter glows, gas valve opens.
Heating cycle: Burners ignite, blower starts after delay, heat exchanger warms.
Shutdown: Thermostat satisfied, gas valve closes, blower runs for cool-down.
Emergency shutoff: Use gas shutoff valve or electrical disconnect.

WARNING! Never bypass safety controls. Monitor for unusual sounds or odors.

Safety Features

Flame rollout switches: Shut off gas if flame escapes burner area. Limit switches: Prevent overheating. Pressure switches: Ensure proper venting. Ignition safety: Prevents gas flow without ignition.

Maintenance & Cleaning

Annual professional maintenance recommended. Monthly filter changes during heating season.

CAUTION! Turn off power and gas before servicing. Use approved replacement parts only.

Regulatory Information

ANSI Z21.47: Certified for gas-fired central furnaces. UL: Listed for electrical safety. Meets DOE efficiency standards. For support, visit www.armstrongair.com or contact 1-800-448-5872.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power/thermostat	Check circuit breaker, thermostat settings, door switch.
No heat	Gas/pilot/ignition	Verify gas supply, check igniter, inspect flame sensor.
Short cycling	Filter/airflow	Replace filter, check for blocked vents, verify blower operation.
Blower won't stop	Thermostat/fan limit	Check thermostat fan setting, test fan limit control.
Unusual noises	Motor/bearings	Lubricate motor (if applicable), check for loose components.

Reset: Power cycle unit or reset control board if equipped.

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