Fedders Furnace Manual

The Fedders Furnace is a high-efficiency heating system designed for residential use, featuring advanced combustion technology, multiple heat settings, digital thermostat control, safety shut-off mechanisms, energy-saving modes, and easy maintenance access. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: High-efficiency heat exchanger, Digital control board, Blower motor, Gas valve, Ignition system, Air filter compartment, Safety sensors.

Feature	Description
Heat exchanger	Stainless steel construction for maximum efficiency
Digital control board	Microprocessor-controlled operation with diagnostic LEDs
Blower motor	Variable speed ECM motor for quiet operation
Gas valve	Precision gas flow control with safety shut-off
Ignition system	Hot surface ignition for reliable starts
Air filter compartment	Easy-access slide-out filter tray
Safety sensors	Flame rollout and limit switches
Thermostat connection	Standard 24VAC connection terminals
Pressure switch	Ensures proper venting operation
Service light	LED indicator for maintenance reminders

Installation

Unpack and inspect all components. Ensure proper clearances and ventilation.

1. Position furnace: Place on stable, level surface with adequate clearance.
2. Connect gas line: Use approved gas piping; pressure test for leaks.
3. Connect electrical: 120V AC power supply; proper grounding required.
4. Connect venting: Install approved vent pipe according to local codes.
5. Connect thermostat: Use 18-gauge thermostat wire.

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

First-Time Setup

Power on furnace; follow startup procedure.

1. Verify gas connection: Check for leaks with soap solution.
2. Set thermostat: Install batteries; set to desired temperature.
3. Initial startup: System will go through self-test sequence.
4. Check airflow: Ensure all vents are open and unobstructed.
5. Test operation: Run furnace through complete heating cycle.

CAUTION! Never bypass safety devices. Ensure proper ventilation during operation.

Specifications

• Heating Capacity: 40,000-120,000 BTU/h (model dependent)
• Efficiency: 80-96% AFUE
• Fuel Type: Natural gas or propane
• Electrical: 120V AC, 60Hz
• Blower Motor: ECM variable speed
• Heat Exchanger: Stainless steel
• Warranty: 10-year heat exchanger, 5-year parts
• Operating Temp Range: -30°F to 120°F
• Sound Level: < 65 dB

Controls and Settings

Access control board via front panel. Diagnostic LEDs indicate system status.

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

Furnace Controls: Power switch, Service switch, Diagnostic LED codes, Blower speed taps, Gas pressure adjustment (qualified technician only). Safety: High limit control, Pressure switch, Flame sensor, Rollout switches.

Connecting Thermostat

Standard 24VAC thermostat connection with R, W, G, Y, C terminals.

1. Turn off power to furnace at main disconnect.
2. Remove thermostat cover and connect wires to appropriate terminals.
3. Match wire colors: R (24V), W (Heat), G (Fan), Y (Cool), C (Common).
4. Secure wires and replace cover.
5. Restore power and test operation.

Tip: Use programmable thermostat for maximum energy savings.

Operating Modes

Multiple operating modes for efficiency and comfort.

1. Heating Mode: Primary heating operation with variable output.
2. Fan Only: Continuous air circulation without heat.
3. Standby: System ready but not actively heating.
4. Service Mode: For technician diagnostics and testing.
5. Lockout Mode: Safety shutdown requiring reset.

WARNING! Do not attempt to operate if unusual odors or sounds are present.

Safety Features

Multiple safety systems protect against hazardous conditions.

Safety Feature	Function
Flame rollout switch	Shuts off gas if flame escapes burners
High limit switch	Prevents overheating
Pressure switch	Ensures proper venting before ignition
Flame sensor	Confirms burner ignition
Gas valve	Automatic shut-off if flame not detected

Maintenance & Cleaning

Regular maintenance ensures optimal performance and longevity.

1. Monthly: Check and replace air filter if dirty.
2. Seasonal: Inspect vent system for obstructions.
3. Annual: Professional inspection and cleaning.
4. As needed: Clean flame sensor and burners.

CAUTION! Always turn off power and gas supply before performing any maintenance.

Regulatory Information

UL listed and ANSI certified for safety. Complies with ASHRAE standards for residential heating equipment. Manufactured to meet or exceed DOE efficiency requirements. For technical support, visit www.fedders.com or contact 1-800-474-2147.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, gas	Check power switch; verify thermostat setting; ensure gas valve open.
No heat	Pilot, filter, limit switch	Check ignition; replace dirty filter; reset high limit switch.
Short cycling	Filter, airflow, sensor	Clean/replace filter; check vents; clean flame sensor.
Unusual noises	Blower, motor, ducts	Inspect blower wheel; lubricate motor; check ductwork.
Blower runs continuously	Thermostat, control board	Check thermostat fan setting; inspect control board.

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

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