Kenmore Gas Furnace Manual

The Kenmore Gas Furnace is a high-efficiency heating system designed for residential use, featuring electronic ignition, variable-speed blower motor, multiple heat stages, safety controls, and energy-saving operation. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

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

Features at a Glance

Key components: Gas valve, heat exchanger, blower assembly, electronic ignition system, pressure switches, flame sensor, limit switches.

Feature	Description
Electronic ignition	Hot surface igniter for reliable startup
Variable-speed blower	Adjustable airflow for efficiency and comfort
Multi-stage heating	Multiple heat levels for energy savings
Safety controls	Pressure switches, flame rollout, high limit
Diagnostic LED	Flash codes for troubleshooting
Gas valve	Precise gas flow control
Filter access	Easy filter replacement
Drain connection	Condensate removal for high-efficiency models
Power switch	Unit on/off control
Thermostat connection	Standard 24VAC control wiring

Installation

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

Gas connection: Use approved gas pipe; apply pipe joint compound on male threads only.
Vent system: Install according to local codes; use approved vent materials.
Electrical: Connect to 120V AC power; install properly grounded outlet.
Thermostat: Connect 24VAC control wires (R, W, G, C, Y).
Drain line: Connect condensate drain for high-efficiency models.

WARNING! Gas appliances can be dangerous; installation must be performed by qualified technician. Ensure proper ventilation.

First-Time Setup

Power on furnace; follow startup sequence.

Gas supply: Open main gas valve; check for leaks with soap solution.
Thermostat setup: Set to HEAT mode; adjust temperature setting.
Initial ignition: System will perform self-check and attempt ignition.
Blower operation: Verify proper airflow and temperature rise.
Safety check: Confirm all safety switches are functioning properly.

CAUTION! Do not bypass safety controls. Ensure proper combustion air supply.

Specifications

Input Capacity: 40,000-120,000 BTU/h (model dependent)
Efficiency: 80-96% AFUE
Gas Type: Natural gas or LP (conversion kit required)
Electrical: 120V AC, 60Hz, 15A circuit
Blower Motor: Variable-speed ECM
Heat Stages: Single or two-stage operation
Vent Size: 2-4 inch PVC or metal
Filter Size: Standard 16x25x1 inch or model specific
Operating Temp: Standard indoor conditions

Controls and Settings

Access control board via front panel. Integrated control module with diagnostic LED.

Thermostat: HEAT/COOL/OFF mode, FAN AUTO/ON, temperature setting, program schedules.

Furnace Controls: Power switch, gas valve, pressure switches, limit controls, flame sensor, igniter. Diagnostic: LED flash codes for troubleshooting (1 flash = normal, 2 flashes = pressure switch, etc.). Settings: Blower speed adjustments, temperature rise verification, cycle rate adjustment.

Connecting Thermostat

Standard 24VAC thermostat wiring: R (power), W (heat), G (fan), C (common), Y (cooling).

Turn off furnace power before wiring.
Match thermostat wires to control board terminals.
Use 18-gauge thermostat wire for connections.
Program thermostat for heating operation.

Tip: Ensure proper wire routing away from high-voltage components.

Operation

Normal heating cycle sequence.

Thermostat calls for heat: Sends 24V signal to control board.
Inducer motor: Starts to prove draft and clear combustion chamber.
Pressure switch: Closes when proper draft is established.
Ignition: Hot surface igniter glows for 17-30 seconds.
Gas valve: Opens to allow gas flow to burners.
Flame detection: Flame sensor confirms ignition.
Blower operation: Delayed start for heat exchanger warm-up.
Cycle completion: Continues until thermostat satisfied.

WARNING! Do not attempt to service gas components. Contact qualified technician.

Maintenance

Regular maintenance ensures efficiency and safety.

Monthly: Check and replace air filter as needed
Annual: Professional inspection and cleaning
Seasonal: Check vent system for obstructions
As needed: Clean flame sensor and burners

Care & Cleaning

Turn off power before cleaning. Use soft brush for burners; vacuum blower compartment.

CAUTION! Do not use water or chemical cleaners on electrical components. Keep area around furnace clear.

Regulatory Information

ANSI Z21.47: Certified for safety standards. UL listed components. For natural gas operation. Installation must comply with National Fuel Gas Code and local regulations. Copyright © Kenmore; trademarks of Sears Brands, LLC. For support, visit www.kenmore.com or contact 1-800-469-4668.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power/thermostat	Check circuit breaker; verify thermostat setting and batteries.
No heat	Gas supply/ignition	Check gas valve; observe LED codes; verify pilot/igniter operation.
Blower doesn't run	Motor/limit switch	Check blower door switch; verify motor operation; check limits.
Short cycling	Filter/overheating	Replace dirty filter; check for blocked vents; verify proper airflow.
Unusual noises	Mechanical issues	Check for loose components; lubricate motor if applicable; inspect blower wheel.

Reset: Turn power off for 30 seconds then restore.

Service: 1-800-469-4668; www.kenmore.com