Ducane Furnace CMPE100U4 Manual

The Ducane CMPE100U4 is a high-efficiency gas furnace with 100,000 BTU input capacity, 80% AFUE rating, single-stage operation, natural gas compatibility, electronic ignition, multi-speed blower motor, durable heat exchanger, and safety features including flame rollout and limit switches. Designed for residential heating applications with standard 120V AC power requirement. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Gas valve, burners, heat exchanger, blower assembly, filter rack, control board, pressure switches, flame sensor, igniter.

Installation Requirements

Unpack and inspect all components. Ensure proper location and clearances.

1. Location: Install in dry, well-ventilated area with minimum clearances as specified.
2. Gas connection: Use approved gas pipe and fittings; pressure test for leaks.
3. Electrical connection: 120V AC power supply with proper grounding.
4. Venting: Category I venting system; follow local codes for vent pipe installation.
5. Ductwork: Properly sized and sealed duct system for efficient operation.

WARNING! Gas furnaces produce carbon monoxide; proper venting is critical. Installation must comply with local codes and be performed by qualified technician.

First-Time Setup

Complete installation verification before initial startup.

1. Gas pressure adjustment: Set manifold pressure to 3.5" W.C. for natural gas.
2. Blower speed settings: Adjust cooling and heating speeds as required.
3. Thermostat configuration: Connect compatible 24V thermostat.
4. System checkout: Verify proper ignition sequence and flame characteristics.
5. Combustion analysis: Check CO levels and efficiency parameters.

CAUTION! Never bypass safety controls. Test all safety devices before placing in service.

Specifications

• Input Capacity: 100,000 BTU/h
• AFUE Rating: 80%
• Gas Type: Natural Gas
• Manifold Pressure: 3.5" W.C.
• Electrical: 120V AC, 60Hz
• Blower Motor: Multi-speed PSC
• Airflow Range: 800-1600 CFM
• Venting: Category I
• Dimensions: Standard upflow configuration
• Weight: Approximately 120 lbs

Controls and Operation

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

Operation Sequence: Thermostat call for heat → inducer motor starts → pressure switch verification → hot surface igniter energizes → gas valve opens → flame establishment → blower starts after heat exchanger warm-up.

Status Lights: Green - normal operation; Red flashing - fault condition (refer to fault code chart). Gas Valve: Single-stage operation. Blower Control: Automatic delay on start and stop. Limit Controls: Auto-reset high temperature limits.

Thermostat Connection

Compatible with standard 24V thermostats. Terminal designations: R (24V), W (Heat), G (Fan), C (Common).

1. Turn off power to furnace before thermostat connection.
2. Connect thermostat wires to control board terminals.
3. Ensure proper polarity and secure connections.
4. Program thermostat for heating operation.

Tip: Use 18-gauge thermostat wire for runs under 50 feet.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

1. Monthly: Check and replace air filter as needed.
2. Annual: Professional inspection and cleaning.
3. Burner inspection: Clean burners and check flame pattern.
4. Heat exchanger: Visual inspection for cracks or damage.
5. Blower assembly: Clean blower wheel and housing.
6. Vent system: Inspect for obstructions or deterioration.
7. Safety devices: Test operation of all safety controls.

WARNING! Gas furnace maintenance should be performed by qualified technicians only.

Safety Features

Multiple safety systems protect against hazardous conditions: Flame rollout switches, high limit switches, pressure switches, flame sensor, igniter control, gas valve safety shutoff.

Care & Cleaning

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

CAUTION! Never use water or liquid cleaners on electrical components. Keep combustion area clear of debris.

Regulatory Information

ANSI Z21.47/CSA 2.3: Certified for natural gas operation. UL listed. Installation must comply with National Fuel Gas Code NFPA 54 and local building codes. For technical support, contact Ducane HVAC at 1-800-338-0525 or visit www.ducanehvac.com.

Troubleshooting

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

Service: 1-800-338-0525; www.ducanehvac.com