Longwood Furnace Owners Manual

The Longwood Furnace is a high-efficiency residential heating system designed for reliable performance and energy savings. This furnace features variable-speed blower technology, electronic ignition, multiple heat stages, smart thermostat compatibility, air filtration system, safety shut-off controls, and energy-efficient operation. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

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

Features at a Glance

Key components: Variable-speed ECM blower motor, electronic hot surface igniter, multi-position installation capability, smart thermostat interface, air filter compartment, pressure switches, flame sensor, and diagnostic LED indicators.

Feature	Description
Variable-speed blower	Provides consistent airflow and quiet operation
Electronic ignition	Eliminates standing pilot light for energy savings
Multi-position installation	Can be installed in upflow, downflow, or horizontal configurations
Smart thermostat compatible	Works with most modern programmable thermostats
Air filter system	Standard 1-inch or 4-inch media filter compatibility
Diagnostic LED	Flashing codes for troubleshooting
Safety controls	Automatic shut-off for overheating or pressure issues
Two-stage heating	Provides efficient operation at lower demand
AFUE rating	High efficiency up to 96% AFUE
Quiet operation	Insulated cabinet and variable-speed technology

Installation Requirements

Professional installation recommended. Ensure proper clearances and venting.

Location: Install in dry, clean area with proper clearances (see specifications).
Venting: Use approved PVC or metal venting materials as specified.
Gas connection: Use proper pipe size and thread sealant approved for natural gas.
Electrical: 120V AC power supply with proper grounding.
Thermostat wiring: Connect to appropriate terminals (R, W, G, Y, C).

WARNING! Installation must comply with local codes and be performed by qualified technician. Improper installation can cause fire, explosion, or carbon monoxide poisoning.

First-Time Setup

After professional installation, complete initial setup procedures.

Power on furnace: Turn on electrical power and gas supply.
Thermostat setup: Program desired temperature settings and schedule.
Test operation: Set thermostat above room temperature to initiate heating cycle.
Verify airflow: Check all supply registers for proper airflow.
Inspect venting: Ensure proper combustion and vent operation.

CAUTION! Never attempt to adjust gas pressure or electrical connections unless qualified. Keep combustibles away from furnace.

Technical Specifications

Heating Capacity: 40,000 to 120,000 BTU/h (model dependent)
AFUE Rating: Up to 96% Annual Fuel Utilization Efficiency
Blower Motor: Variable-speed ECM
Stages: Single or two-stage heating (model dependent)
Voltage: 120V AC, 60Hz
Gas Type: Natural gas (propane conversion kit available)
Venting: PVC, CPVC, or ABS (check local codes)
Filter Size: 1" or 4" media filters
Sound Level: As low as 65 dBA
Warranty: Limited lifetime heat exchanger, 10 years parts

Controls and Settings

Primary control through thermostat. Internal controls accessed via control board.

Thermostat Settings: HEAT/COOL/OFF, FAN AUTO/ON, temperature setpoint, program schedule.

Control Board: Diagnostic LED (flashing codes), pressure switch terminals, igniter control, blower relay, safety limit switches. DIP switches for blower timing, staging configuration.

Gas Valve: Manual shut-off, pressure regulation. DO NOT ADJUST unless qualified.

Operating Instructions

Normal operation is automatic via thermostat control.

Set thermostat to HEAT mode and desired temperature.
Furnace will automatically cycle on when room temperature drops below setpoint.
Ignition sequence: Inducer motor starts, pressure switch closes, igniter heats, gas valve opens, flame established.
Heating cycle: Blower starts after warm-up delay, circulates heated air.
Shutdown: Gas valve closes, blower continues during cool-down period.

Tip: Keep thermostat away from heat sources and drafts for accurate temperature control.

Maintenance Schedule

Regular maintenance ensures efficiency and longevity.

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

WARNING! Turn off power and gas before performing any maintenance. Only qualified technicians should service internal components.

Safety Features

Multiple safety systems protect against hazardous conditions.

Flame Rollout Switch: Shuts off gas if flame detected outside burners
High Limit Switch: Prevents overheating by shutting off burners
Pressure Switches: Ensure proper venting before ignition
Flame Sensor: Confirms flame presence; shuts off gas if no flame
Ignition Lockout: Prevents repeated ignition attempts after failures
Gas Valve: Automatic shut-off in case of system fault

Care & Cleaning

Regular cleaning maintains efficiency and prevents issues.

Air filter: Replace every 1-3 months during heating season
Exterior: Wipe with damp cloth; avoid harsh chemicals
Vents: Keep intake and exhaust clear of debris
Burners: Professional cleaning only
Blower: Vacuum accessible areas during professional service

CAUTION! Never use water or cleaning solutions on electrical components. Keep area around furnace clean and dry.

Regulatory Information

UL listed and ANSI certified. Complies with ANSI Z21.47 standards for gas-fired central furnaces. CSA International certified. Installation must comply with National Fuel Gas Code (NFPA 54) and local building codes. For support, contact Longwood Heating Systems at 1-800-LONGWOOD or visit www.longwoodheating.com.

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, limit switch	Check diagnostic LED, replace filter, reset limit switch
Short cycling	Dirty filter, airflow restriction	Replace filter, check vents and registers
Blower won't stop	Thermostat fan setting	Set thermostat fan to AUTO instead of ON
Unusual noises	Loose parts, airflow issues	Check for loose panels, restricted airflow
Burners won't light	Gas supply, igniter, flame sensor	Check gas valve, inspect igniter and flame sensor

Diagnostic Codes: Refer to control board LED flashing pattern chart for specific error codes.

Service: 1-800-LONGWOOD; www.longwoodheating.com