Ducane MPGA Furnace Manual

The Ducane MPGA Furnace is a high-efficiency gas furnace designed for residential heating applications. This multi-position gas furnace features advanced combustion technology, electronic ignition, variable-speed blower motor, and comprehensive safety controls. Below are key sections covering safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Multi-position cabinet design, electronic ignition system, variable-speed blower motor, aluminized steel heat exchanger, integrated control board.

Installation Guidelines

Proper installation is critical for safe and efficient operation. Follow all local codes and manufacturer instructions.

1. Location selection: Choose well-ventilated area with adequate clearance for service access.
2. Gas line connection: Use approved black iron pipe with proper thread sealant.
3. Electrical wiring: Connect to dedicated 120V circuit with proper grounding.
4. Venting installation: Install PVC vent pipes according to manufacturer specifications.
5. Ductwork connection: Ensure proper sealing and insulation of all duct connections.

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

First-Time Setup

Initial startup and configuration procedures for new installation.

1. Gas pressure adjustment: Verify and adjust manifold pressure to specifications.
2. Blower speed settings: Configure cooling and heating speeds for optimal performance.
3. Venting verification: Confirm proper draft and vent pipe integrity.
4. Combustion analysis: Check CO levels and combustion efficiency.
5. System testing: Run complete heating cycle to verify operation.

CAUTION! Only qualified technicians should perform initial startup and adjustment procedures.

Technical Specifications

• Model Series: MPGA
• Input Capacity: 40,000 - 120,000 BTU/H (varies by model)
• Efficiency Rating: 80% AFUE minimum
• Gas Type: Natural Gas (LP conversion kits available)
• Electrical: 120V, 60Hz, 1.5-3.0 Amps
• Blower Motor: ECM variable speed
• Maximum External Static Pressure: 0.8 inches w.c.
• Vent Pipe Size: 2-inch or 3-inch PVC
• Dimensions: Varies by model (typically 21"W x 21"D x 40"H)
• Weight: 90-130 pounds depending on model

Controls and Operation

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

Control Board Features: Self-diagnostic capability, status LED, dip switch settings, terminal connections for thermostat.

Operating Modes: Heating cycle, blower operation, safety lockout, diagnostic mode. Status Lights: Green for normal operation, flashing codes for troubleshooting. Temperature Control: Responds to thermostat signals for heating demand. Blower Control: Variable speed operation with timed delays.

Venting Requirements

Proper venting is essential for safe operation and efficiency.

1. Vent pipe material: Schedule 40 PVC or CPVC only.
2. Vent termination: Minimum 12 inches from ground level, 3 feet from openings.
3. Combustion air: Provide adequate fresh air intake as per local codes.
4. Vent slope: Horizontal runs should slope upward 1/4 inch per foot.
5. Clearances: Maintain required clearances to combustible materials.

Tip: Always verify vent system integrity before furnace operation.

Maintenance Procedures

Regular maintenance ensures optimal performance and longevity.

1. Filter replacement: Change filters every 1-3 months depending on usage.
2. Blower cleaning: Vacuum blower wheel and housing annually.
3. Heat exchanger inspection: Check for cracks or corrosion during annual service.
4. Burner cleaning: Remove and clean burners to ensure proper flame pattern.
5. Vent system inspection: Verify vent pipes are clear and properly connected.
6. Gas pressure check: Verify manifold pressure remains within specifications.
7. Safety controls: Test all safety switches for proper operation.
8. Electrical connections: Check for loose wires or corrosion.

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

Safety Features

Multiple safety systems protect against hazardous conditions.

Flame Rollout Switch: Detects flame outside combustion chamber. Pressure Switch: Ensures proper venting before ignition. High Limit Switch: Prevents overheating by shutting off burners. Ignition Control: Monitors flame presence during operation. Gas Valve: Includes manual shutoff and pressure regulation.

Care & Maintenance

Regular care extends furnace life and maintains efficiency.

Keep area around furnace clear of combustible materials. Ensure proper airflow by maintaining clean filters. Schedule professional annual inspection and cleaning. Monitor for unusual noises, odors, or performance changes.

CAUTION! Never block combustion air openings or vent terminations. Keep furnace area clean and dry.

Regulatory Information

UL listed and ANSI certified for safety standards. Complies with Department of Energy efficiency requirements. Manufactured to meet or exceed industry standards for gas-fired furnaces. For technical support, contact Ducane Customer Service at 1-800-ducane1 or visit www.ducanehvac.com.

Troubleshooting Guide

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

Service: 1-800-ducane1; www.ducanehvac.com