York LX Series Furnace Manual

The York LX Series Furnace is a high-efficiency gas furnace designed for residential heating applications, featuring advanced combustion technology, variable-speed blower motors, quiet operation, and energy-saving capabilities. 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. Operating Procedures 8. Maintenance Schedule 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: High-efficiency heat exchanger, Variable-speed blower motor, Electronic ignition system, Multi-speed inducer motor, Diagnostic LED lights.

Feature	Description
Heat Exchanger	Stainless steel construction for durability and efficiency
Blower Motor	Variable-speed ECM motor for quiet operation
Ignition System	Hot surface ignition for reliable startup
Inducer Motor	Multi-speed for optimal combustion airflow
Diagnostic Lights	LED indicators for troubleshooting
Gas Valve	Modulating for precise temperature control
Air Filter	Standard 1-inch or 4-inch media filter
Pressure Switches	Safety switches for combustion verification
Flue Outlet	PVC piping compatible
Electrical Connection	120V AC standard connection

Installation

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

Position furnace: Place on stable, level surface with proper clearances.
Connect gas line: Use approved gas piping and fittings; pressure test required.
Connect venting: Install PVC vent pipes according to local codes.
Electrical wiring: Connect 120V power supply and thermostat wiring.
Ductwork: Connect supply and return ducts securely.

WARNING! Installation must be performed by qualified HVAC technician. Gas connections require leak testing.

First-Time Setup

Power on furnace; follow startup sequence.

Verify gas supply: Ensure gas valve is open and pressure is correct.
Check electrical: Confirm proper voltage at furnace.
Set thermostat: Program desired temperature settings.
Test operation: Initiate heating cycle and verify proper function.
Adjust blower speed: Set appropriate CFM for duct system.

CAUTION! Never bypass safety controls. Ensure proper ventilation.

Specifications

Models: LX 40, LX 60, LX 80, LX 100 series
Input BTU: 40,000 to 120,000 BTU/hr
Efficiency: 95%+ AFUE rating
Blower Type: Variable-speed ECM
Gas Type: Natural gas or LP (conversion kit required)
Electrical: 120V AC, 60Hz
Venting: PVC pipe (2" or 3" diameter)
Sound Level: Ultra-quiet operation
Warranty: Limited lifetime heat exchanger

Controls and Settings

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

Control Board: LED status lights, DIP switches for configuration, reset button.

Temperature: Set via thermostat. Blower Speed: Adjustable via DIP switches (LOW, MED, HIGH). Timing: Adjust blower on/off delays. Diagnostic Codes: LED flash patterns indicate system status. Safety Controls: Limit switches, pressure switches, rollout switches.

Connecting Thermostat

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

Turn off power to furnace before wiring.
Connect thermostat wires to control board terminals.
Match wire colors to terminal labels (R-red, W-white, G-green, C-common).
Program thermostat for heating mode and desired temperature range.

Tip: Use programmable thermostat for energy savings.

Operating Procedures

Automatic operation via thermostat control.

Set temperature: Adjust thermostat to desired setting.
Heating cycle: Furnace ignites and begins heating sequence.
Blower operation: Variable-speed blower adjusts airflow.
Shutdown: System cycles off when temperature reached.
Standby: Furnace remains ready for next heating call.

WARNING! Never operate without proper venting. Monitor for unusual noises or odors.

Maintenance Schedule

Regular maintenance ensures optimal performance and longevity.

Monthly: Check and replace air filter if dirty
Seasonal: Inspect vent system for obstructions
Annual: Professional inspection and cleaning
Every 2 years: Heat exchanger inspection
As needed: Blower motor lubrication (if required)

Care & Cleaning

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

CAUTION! Do not use water or liquid cleaners. Keep combustion area clean and clear.

Regulatory Information

ANSI Z21.47: Certified for gas furnace safety standards. UL listed for electrical safety. Meets DOE efficiency requirements. Copyright © 2025 York; trademarks of Johnson Controls. For support, visit www.york.com or contact 1-800-962-1000.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No heat	Thermostat setting/power	Check thermostat setting; verify power to furnace; check gas supply.
Furnace not starting	Safety lockout	Reset power; check diagnostic lights; verify venting.
Blower not running	Motor/control issue	Check blower door switch; verify motor operation; check capacitor.
Unusual noises	Mechanical issues	Inspect blower wheel; check motor bearings; verify duct connections.
Short cycling	Filter/venting	Replace dirty filter; check for blocked vents; verify thermostat location.

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

Service: 1-800-962-1000; www.york.com