Longwood Furnace Manual

The Longwood Furnace is a high-efficiency residential heating system designed for reliable performance and energy savings. This gas furnace features variable-speed blower technology, electronic ignition, multi-stage heating, quiet operation, built-in diagnostics, smart thermostat compatibility, and energy-saving modes. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Burner assembly, heat exchanger, blower motor, electronic control board, gas valve, pressure switches, flame sensor, and diagnostic LED.

Feature	Description
Variable-speed blower	Adjusts airflow for optimal efficiency and comfort
Multi-stage heating	Two-stage operation for energy savings
Electronic ignition	Reliable spark ignition system
Built-in diagnostics	LED status lights for troubleshooting
Smart thermostat ready	Compatible with modern thermostat systems
Quiet operation	Sound-absorbing insulation
Energy-saving modes	Programmable for reduced energy consumption
Safety switches	Pressure and temperature safety controls
Filter monitoring	Reminder system for filter replacement
Service light	Indicates when professional service is needed

Installation

Unpack and inspect contents. Ensure proper location with adequate clearance.

1. Position furnace: Place on stable, level surface with proper clearances.
2. Connect gas line: Use approved gas piping and fittings.
3. Connect venting: Install proper vent pipes according to local codes.
4. Electrical connections: Connect to 120V AC power supply.
5. Connect thermostat: Wire according to terminal designations.
6. Install air filter: Insert clean filter in filter compartment.

WARNING! Installation must be performed by qualified HVAC technician. Gas connections require proper sealing and testing.

First-Time Setup

Power on furnace; follow startup sequence.

1. Check gas supply: Ensure gas valve is open and supply is available.
2. Set thermostat: Program desired temperature settings.
3. Test operation: Initiate heating cycle to verify proper function.
4. Check airflow: Verify proper airflow from all registers.
5. Monitor diagnostics: Observe LED status lights for normal operation.

CAUTION! Do not bypass safety controls. Ensure proper ventilation during initial operation.

Specifications

• Heating Capacity: 40,000 - 120,000 BTU/h (model dependent)
• Efficiency: Up to 96% AFUE
• Stages: Single or two-stage operation
• Blower Type: Variable-speed ECM motor
• Voltage: 120V AC, 60Hz
• Gas Type: Natural gas or propane (conversion kit required)
• Venting: PVC or approved metal venting
• Dimensions: Varies by model (check specific model label)
• Sound Level: As low as 65 dB
• Warranty: Limited lifetime heat exchanger, 10 years parts

Controls and Settings

Access control board via front panel. LED status lights indicate system operation.

Thermostat Controls: Temperature setting, fan control, system mode, program schedules.

Operating Modes: HEAT, OFF, FAN ON. Blower Settings: AUTO, ON. Temperature Settings: Programmable schedules. Diagnostic Codes: LED flash patterns indicate specific issues. Safety Controls: High-limit switch, pressure switches, flame sensor, rollout switches.

Connecting Thermostat

Compatible with most 24V thermostats. Standard terminal designations: R, W, Y, G, C.

1. Turn off power to furnace before wiring.
2. Match thermostat wires to control board terminals.
3. Use proper wire gauge and connections.
4. Program thermostat according to manufacturer instructions.

Tip: For smart thermostats, follow specific manufacturer installation guide.

Operating Modes

Multiple operating modes for efficiency and comfort.

1. Heat Mode: Primary heating operation with multi-stage capability.
2. Fan Mode: Continuous or intermittent blower operation.
3. Energy Saver: Reduces energy consumption during mild weather.
4. Vacation Mode: Maintains minimum temperature during absence.
5. Diagnostic Mode: Service mode for troubleshooting.

WARNING! Do not operate furnace with access panels removed. Keep combustible materials away from furnace.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

1. Monthly: Check and replace air filter as needed.
2. Seasonal: Inspect vent system for obstructions.
3. Annual: Professional inspection and cleaning.
4. As needed: Clean flame sensor and check burners.
5. Monitor: Check condensate drain line for blockages.

CAUTION! Annual professional maintenance recommended. Turn off power and gas before servicing.

Care & Cleaning

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

CAUTION! Do not use water or liquid cleaners. Keep electrical components dry.

Regulatory Information

UL certified for safety standards. ANSI Z21.47 compliant for gas appliances. Meets DOE energy efficiency requirements. For support, visit www.longwoodfurnace.com or contact 1-800-555-HEAT. Copyright © 2025 Longwood Heating Systems.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, gas supply	Check circuit breaker, thermostat settings, gas valve position.
No heat	Pilot/ignition, filter	Check for ignition failure, replace dirty air filter.
Short cycling	Filter, thermostat location	Clean/replace filter, check thermostat placement.
Blower not working	Power, motor, controls	Check power to blower, motor capacitor, control board.
Unusual noises	Mechanical issues	Check for loose components, blower wheel, motor bearings.

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

Service: 1-800-555-HEAT; www.longwoodfurnace.com