Fedders Gas Furnace Manuals

Fedders gas furnaces are reliable heating systems designed for residential and light commercial use. These high-efficiency furnaces feature advanced combustion technology, electronic ignition systems, multiple safety controls, and energy-saving operation modes. Below are comprehensive manuals covering installation, operation, maintenance, and troubleshooting for various Fedders gas furnace models.

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

Features at a Glance

Key components: Gas valve, heat exchanger, blower motor, electronic ignition, thermostat connection, safety switches, and venting system.

Feature	Description
Electronic Ignition	Energy-efficient hot surface ignition system
Multi-Speed Blower	Variable speed operation for optimal airflow
Heat Exchanger	Stainless steel construction for durability
Safety Controls	Flame rollout switch, limit switches, pressure switches
Venting System	PVC or metal venting options
Gas Valve	Precise gas flow regulation
Thermostat Connection	Compatible with standard 24V thermostats
Filter System	Standard 1-inch or 4-inch media filters
Efficiency Rating	80% to 96% AFUE depending on model
Control Board	LED diagnostic indicators for troubleshooting

Installation Guidelines

Professional installation recommended. Unpack and inspect all components before beginning.

Location Selection: Choose well-ventilated area with proper clearances.
Gas Connection: Use approved gas piping; test for leaks with soap solution.
Electrical Wiring: Connect to dedicated 120V circuit; proper grounding required.
Venting Installation: Install according to local codes and manufacturer specifications.
Ductwork Connection: Ensure proper sizing and sealing of supply/return ducts.

WARNING! Gas furnaces must be installed by qualified technicians only. Improper installation can cause fire, explosion, or carbon monoxide poisoning.

First-Time Setup

Initial startup and configuration procedures.

System Check: Verify all connections are secure and proper.
Gas Pressure Adjustment: Set manifold pressure according to model specifications.
Blower Speed Setting: Adjust for proper airflow and temperature rise.
Thermostat Configuration: Program heating cycles and temperature settings.
Safety Test: Verify operation of all safety controls and switches.

CAUTION! Never bypass safety controls. Always perform combustion analysis during startup.

Technical Specifications

Input Capacity: 40,000 to 120,000 BTU/h depending on model
Efficiency: 80% to 96% AFUE
Gas Type: Natural gas or propane (conversion kit required)
Electrical: 120V, 60Hz, 15A circuit
Blower Motor: Multi-speed PSC or ECM
Static Pressure: 0.1 to 0.8 inches WC
Venting: Category I or IV depending on efficiency
Dimensions: Varies by model (typically 21"W x 21"D x 40"H)
Warranty: 20-year heat exchanger, 5-year parts

Controls and Settings

Access control board via front panel. Integrated control system with diagnostic LEDs.

Thermostat Settings: HEAT/COOL/OFF, FAN AUTO/ON, temperature setpoints.

Furnace Controls: Power switch, gas valve, blower speed taps, limit switches, pressure switches. Diagnostic LEDs: Flash codes indicate specific operational status or fault conditions. Configuration: Blower off-delay, gas pressure, ignition timing, safety lockout parameters.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

Monthly: Check and replace air filter as needed.
Seasonal: Inspect burners, heat exchanger, and venting system.
Annual: Professional inspection and cleaning recommended.
Blower Maintenance: Clean blower wheel and housing annually.
Safety Check: Test all safety controls and switches.

Tip: Keep area around furnace clear of combustible materials.

Operating Instructions

Normal heating cycle operation and user controls.

Thermostat Call: Set thermostat to desired temperature in HEAT mode.
Ignition Sequence: Inducer motor starts, pressure switch proves, igniter heats, gas valve opens.
Heating Cycle: Burners ignite, blower starts after heat exchanger warms.
Cycle Completion: Thermostat satisfied, gas valve closes, blower continues for cool-down.
Fan Operation: AUTO mode cycles with heat; ON mode runs continuously.

WARNING! Never operate furnace with access panels removed. Keep combustion air openings clear.

Safety Features

Multiple safety systems protect against hazardous conditions. Flame Rollout Switch: Detects flame outside combustion chamber. High Limit Switch: Prevents overheating. Pressure Switches: Verify proper venting operation. Ignition Control: Monitors flame presence. Gas Valve: Automatic shutoff during faults.

Care & Cleaning

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

CAUTION! Do not use water or chemical cleaners on electrical components. Keep flame sensor and igniter clean for proper operation.

Regulatory Information

UL listed and ANSI certified. Complies with ASHRAE standards. Natural gas models designed for 3.5" WC inlet pressure. Propane conversion requires certified kit. Installation must comply with National Fuel Gas Code NFPA 54 and local codes. For technical support, contact Fedders Technical Service at 1-800-474-2147 or visit www.fedders.com.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat settings, ensure door closed properly.
No heat	Gas supply, ignition, filter	Verify gas valve on, check igniter, replace dirty filter.
Short cycling	Filter, limit switch, airflow	Clean/replace filter, check for blocked vents, verify proper airflow.
Blower won't stop	Thermostat, control board	Check thermostat fan setting, inspect control board relay.
Unusual noises	Blower, inducer, ductwork	Inspect blower wheel, check inducer motor, examine duct connections.

Reset: Turn power off for 30 seconds then restart. Check diagnostic LED for error codes.

Service: 1-800-474-2147; www.fedders.com