Ducane 95 Furnace Manual

The Ducane 95 Furnace is a high-efficiency gas furnace with 95% AFUE rating, featuring advanced combustion technology, variable-speed blower motor, electronic ignition, multi-speed operation, diagnostic LED system, and compatibility with standard thermostat controls. Designed for residential heating applications with natural gas or propane capability. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Stainless steel heat exchanger, variable-speed blower motor, electronic ignition system, pressure switches, gas valve, flame sensor, diagnostic LED, and control board.

Installation Requirements

Professional installation required. Verify local codes and obtain permits.

1. Location: Install in dry, clean area with proper clearances (24" front, 6" sides, 1" rear).
2. Gas Connection: Use black iron pipe with proper thread sealant; pressure test required.
3. Electrical: 120VAC, 15A dedicated circuit; proper grounding essential.
4. Venting: PVC pipe system per manufacturer specifications.
5. Combustion Air: Ensure adequate fresh air supply per code requirements.

WARNING! Gas appliances can be dangerous if improperly installed. Use licensed professional for installation.

Initial Setup & Startup

Professional startup procedure required for warranty validation.

1. Verify installation: Check all connections, clearances, and venting.
2. Gas pressure adjustment: Set manifold pressure per specifications (3.5" WC natural gas).
3. Blower speed settings: Adjust cooling and heating speeds per application.
4. System check: Test ignition sequence, safety controls, and temperature rise.
5. Customer orientation: Explain operation, filter maintenance, and basic troubleshooting.

CAUTION! Never bypass safety controls. Carbon monoxide hazard possible with improper installation.

Technical Specifications

• AFUE Rating: 95%
• Input BTU/H: 40,000 - 120,000 (model dependent)
• Gas Type: Natural gas or propane (conversion kit required)
• Electrical: 120VAC, 60Hz, 5.0A max
• Static Pressure: 0.1" to 0.8" WC maximum
• Temperature Rise: 35°F to 65°F
• Venting: 2" or 3" PVC/CPVC
• Sound Level: < 65 dBA
• Dimensions: Varies by model (typical: 21"W x 21"D x 45"H)
• Warranty: 20-year heat exchanger, 5-year parts

Controls and Operation

Integrated control board manages all furnace functions with diagnostic capabilities.

Thermostat Operation: Compatible with standard 24VAC thermostats; two-stage heating capability with appropriate thermostat.

Control Board Functions: Ignition sequence control, blower operation, safety monitoring, diagnostic LED codes. LED Flash Codes: 1 flash - normal operation, 2 flashes - pressure switch error, 3 flashes - ignition failure, 4 flashes - flame sense error, 5 flashes - high limit switch open.

Venting and Combustion Air

Direct vent system using PVC pipe for intake and exhaust.

1. Vent Pipe: Schedule 40 PVC, CPVC, or ABS; minimum 2" diameter.
2. Vent Termination: 12" minimum above ground, 3' from operable windows.
3. Combustion Air: Dedicated PVC pipe or louvers providing adequate airflow.
4. Slope: 1/4" per foot back to furnace to drain condensation.

Tip: Ensure vent pipes are properly supported and sealed to prevent separation.

Maintenance Procedures

Regular maintenance essential for efficiency and safety.

1. Monthly: Check and replace air filter as needed.
2. Annual Professional Service: Clean burners, heat exchanger, and blower assembly.
3. Inspect vent system: Check for obstructions or damage.
4. Check drain system: Clear condensate trap and drain lines.
5. Test safety controls: Verify proper operation of all safety devices.
6. Lubrication: Blower motor bearings if required (most are permanently lubricated).

WARNING! Turn off electrical power and gas supply before performing any maintenance.

Safety Features

Multiple safety systems protect against hazardous conditions.

• Flame Rollout Switches: Detect improper burner combustion
• High Limit Switches: Prevent overheating
• Pressure Switches: Verify proper venting operation
• Flame Sensor: Confirms burner ignition
• Ignition Control: Safe start-up sequence
• Gas Valve: Automatic shut-off on system fault

Cleaning & Care

Regular cleaning maintains efficiency and extends equipment life.

Exterior: Wipe with damp cloth only. Interior: Professional cleaning required. Burners: Clean annually with soft brush. Heat Exchanger: Visual inspection for cracks or corrosion. Blower Wheel: Remove and clean annually. Drain System: Flush with clean water seasonally.

CAUTION! Never use harsh chemicals or excessive water. Electrical components can be damaged by moisture.

Regulatory Compliance

ANSI Z21.47/CSA 2.3: Certified for gas-fired central furnaces. UL 1995: Heating and cooling equipment. Meets U.S. Department of Energy efficiency standards. Manufactured to comply with all applicable safety and performance standards. For technical support, contact Ducane HVAC at 1-800-ducane5 or visit www.ducanehvac.com.

Troubleshooting Guide

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

Service: 1-800-ducane5; www.ducanehvac.com