Trane TUX Furnace Manual

The Trane TUX Furnace is a high-efficiency gas furnace designed for residential heating applications. This manual covers the TUX series models with features including variable-speed blower motors, electronic ignition systems, multiple heating stages, and advanced diagnostic capabilities. Below are key sections for safety, operation, installation, maintenance, troubleshooting, and technical specifications.

Features at a Glance

Key components: Variable-speed blower motor, electronic ignition system, multi-stage gas valve, heat exchanger, pressure switches, and integrated control board.

Feature	Description
Variable-speed blower	Provides consistent airflow and quiet operation
Electronic ignition	Hot surface igniter for reliable startup
Multi-stage heating	Two-stage operation for improved efficiency
Integrated control board	Advanced diagnostics and status LED
Pressure switches	Safety monitoring of combustion airflow
Gas valve	Precise gas flow control
Heat exchanger	Stainless steel construction for durability
Filter cabinet	Standard 1-inch or 4-inch media filter compatible
Vent connections	PVC piping for intake and exhaust
Electrical connections	120V AC power and 24V thermostat control

Installation Requirements

Unpack and inspect furnace components. Ensure proper clearances and location requirements.

1. Location requirements: Minimum 24-inch front clearance, 6-inch sides and rear, 1-inch combustible material clearance.
2. Venting: Install PVC intake and exhaust pipes according to local codes and manufacturer specifications.
3. Gas connection: Use approved gas piping materials; pressure test before operation.
4. Electrical: Connect to 120V AC power supply with proper grounding.
5. Ductwork: Ensure proper sizing and sealing for optimal airflow.

WARNING! Installation must be performed by qualified HVAC technician. Improper installation can cause fire, explosion, or carbon monoxide poisoning.

First-Time Setup

Power on furnace; verify proper operation through startup sequence.

1. System check: Verify gas supply, electrical power, and thermostat connections.
2. Startup sequence: Control board will initiate self-test and ignition sequence.
3. Airflow verification: Check blower operation and airflow through registers.
4. Temperature calibration: Adjust thermostat settings for desired comfort levels.
5. Safety checks: Verify proper venting and combustion air supply.

CAUTION! Never bypass safety controls or operate without proper venting. Ensure adequate combustion air supply.

Technical Specifications

• Heating Capacity: 40,000 to 120,000 BTU/h depending on model
• Efficiency Rating: Up to 96% AFUE
• Stages: Single-stage and two-stage models available
• Blower Motor: Variable-speed ECM motor
• Gas Type: Natural gas (LP conversion kits available)
• Electrical: 120V AC, 60Hz, 15 amp circuit
• Venting: 2-inch PVC intake and exhaust
• Sound Rating: As low as 65 dB operation
• Dimensions: Varies by model (typical: 21"W x 21"D x 45"H)
• Warranty: Limited lifetime heat exchanger, 10-year parts

Controls and Operation

Integrated control board manages all furnace operations with LED status indicators.

Control Board Features: Power LED, status LED, diagnostic codes, dip switch settings for blower speeds and heating stages.

Thermostat Connections: R (24V power), W (heat), G (fan), C (common). Advanced models support Y (cooling) and O/B (heat pump).

Operation Modes: Heating mode, continuous fan mode, diagnostic mode. Blower speeds configurable for heating and continuous fan operation.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

1. Monthly: Check and replace air filter as needed.
2. Seasonal: Inspect vent pipes for obstructions or damage.
3. Annual: Professional inspection of heat exchanger, burners, and safety controls.
4. Bi-annual: Clean blower assembly and check motor operation.
5. As needed: Verify proper gas pressure and combustion analysis.

Tip: Keep area around furnace clean and free of combustible materials.

Diagnostic Features

Integrated control board provides diagnostic codes via status LED.

LED Flash Code	Description	Action Required
1 flash	Normal operation	No action needed
2 flashes	Pressure switch error	Check venting and switches
3 flashes	Ignition failure	Check gas supply and igniter
4 flashes	Limit circuit fault	Check airflow and filters
5 flashes	Flame sense error	Check flame sensor and grounding
Continuous flash	Line voltage error	Check power supply and wiring

Safety Features

Multiple safety systems protect against hazardous conditions.

• Flame rollout switches: Detect improper burner combustion
• High limit switches: Prevent overheating conditions
• Pressure switches: Verify proper venting operation
• Flame sensor: Confirms burner ignition
• Gas valve: Automatic shutoff during power loss
• Ignition control: Safe startup sequence with trial for ignition

WARNING! Never disable safety controls. Carbon monoxide detectors required in living spaces.

Cleaning & Maintenance

Turn off power and gas supply before performing any maintenance.

1. Air filter: Replace every 1-3 months depending on usage
2. Blower assembly: Vacuum annually, clean blower wheel as needed
3. Burners: Professional cleaning recommended every 2-3 years
4. Flame sensor: Clean with emery cloth annually
5. Vent pipes: Inspect for obstructions and proper slope

CAUTION! Always disconnect power before servicing. Use only manufacturer-approved replacement parts.

Regulatory Information

ANSI Z21.47: Certified for gas-fired central furnaces. UL 1995: Standard for heating and cooling equipment. CSA International certified. Meets U.S. Department of Energy efficiency standards. For technical support, contact Trane Residential Solutions at 1-800-554-6413 or visit www.trane.com/residential.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Furnace won't start	Power, thermostat, door switch	Check circuit breaker, thermostat settings, ensure door properly closed
No heat	Gas supply, igniter, filter	Verify gas valve on, check igniter glow, replace dirty filter
Short cycling	Dirty filter, limit switch	Replace filter, check airflow, verify proper venting
Blower won't stop	Thermostat fan setting	Check thermostat fan setting (auto vs. on), control board issue
Unusual noises	Blower, motor, ductwork	Inspect blower wheel, motor bearings, check for loose panels
Error codes flashing	Various system faults	Refer to diagnostic code chart, check specific components

Reset Procedure: Turn power off for 30 seconds, then restore power to reset control board.

Service: 1-800-554-6413; www.trane.com/residential