Trane 90 Furnace Installation Manual

The Trane 90 Furnace is a high-efficiency gas furnace designed for residential heating applications, featuring 90% AFUE rating, variable-speed blower motor, durable heat exchanger, multi-speed operation, electronic ignition, diagnostic LED system, and compatibility with various thermostat systems. Below are key sections for safety, installation procedures, electrical connections, startup, operation, maintenance, and troubleshooting.

Safety Precautions

Critical safety information for proper furnace installation and operation.

Pre-Installation Requirements

Essential preparations before beginning furnace installation.

1. Verify local codes and obtain necessary permits
2. Check furnace rating matches electrical and gas supply
3. Ensure adequate combustion air and venting space
4. Inspect existing ductwork for compatibility
5. Confirm proper condensate drainage location

WARNING! Installation must comply with all local codes and ordinances.

Installation Procedures

Step-by-step furnace installation instructions.

1. Position furnace: Place on level surface with proper clearances
2. Connect ductwork: Attach supply and return ducts securely
3. Install vent pipes: Use approved PVC materials for high-efficiency venting
4. Connect gas line: Use black iron pipe with proper thread sealant
5. Electrical wiring: Connect line voltage and thermostat wiring
6. Condensate drain: Install trap and route to proper drainage

CAUTION! Furnace is heavy; use proper lifting equipment and techniques.

Electrical Connections

Proper wiring procedures for safe furnace operation.

• Line Voltage: 120V AC, 15 amp circuit required
• Thermostat: Low voltage connections (R, W, G, Y, C)
• Grounding: Proper equipment grounding mandatory
• Blower Motor: Variable speed ECM motor connections
• Control Board: Follow wiring diagram exactly

WARNING! Disconnect all power sources before making electrical connections.

Gas Line Connections

Gas supply connection requirements and procedures.

1. Shut off gas supply at main valve
2. Install sediment trap before furnace connection
3. Use approved pipe thread sealant on all connections
4. Pressure test all joints with leak detection solution
5. Connect flexible gas connector if required by local code

DANGER! Gas leaks can cause explosion or fire. Test all connections thoroughly.

Venting System

Proper vent installation for high-efficiency furnace operation.

Startup and Commissioning

Initial startup procedures and system verification.

1. Verify all connections are secure and proper
2. Open gas supply valve slowly
3. Restore electrical power to furnace
4. Set thermostat to heat mode and raise temperature
5. Check ignition sequence and flame operation
6. Verify proper venting and combustion
7. Measure temperature rise and adjust blower speed

IMPORTANT! Complete combustion analysis for optimal performance.

Operating Instructions

Normal furnace operation and control functions.

Thermostat Settings: HEAT/COOL/OFF, temperature setpoint, fan AUTO/ON

LED Diagnostics: Green - normal operation, Red - fault condition (refer to code chart)

Blower Operation: Variable speed adjusts automatically for optimal airflow

Ignition Sequence: Prepurge, ignition trial, main burner operation, postpurge

Maintenance Procedures

Routine maintenance for reliable furnace operation.

1. Monthly: Check air filter, replace if dirty
2. Annual: Professional inspection and cleaning
3. Seasonal: Verify proper venting and drainage
4. As needed: Clean blower assembly and heat exchanger
5. Biannual: Check gas pressure and combustion

NOTE: Only qualified technicians should perform internal maintenance.

Specifications

• Model Series: Trane 90
• AFUE Rating: 90%
• Input BTU: 40,000 - 120,000 (varies by model)
• Electrical: 120V, 60Hz, 15A circuit
• Gas Type: Natural gas (propane conversion kit available)
• Venting: PVC direct vent system
• Blower Motor: ECM variable speed
• Warranty: 20-year heat exchanger, 10-year parts

Troubleshooting

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

Service: Contact authorized Trane dealer for professional service.