Miller Mobile Home Furnace Manual

The Miller Mobile Home Furnace is a high-efficiency heating system designed specifically for mobile home applications, featuring sealed combustion technology, electronic ignition, multi-speed blower motor, safety shut-off switches, and compatibility with natural gas or propane. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Sealed combustion chamber, electronic ignition system, multi-speed direct drive blower, limit switches, gas valve, venting system.

Installation Requirements

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

1. Location: Install in approved mobile home furnace compartment with proper clearances.
2. Venting: Use only mobile home approved venting materials; maintain proper slope.
3. Gas Connection: Use approved gas pipe; pressure test for leaks before operation.
4. Electrical: Connect to dedicated 120V circuit; proper grounding required.
5. Combustion Air: Ensure adequate fresh air supply for sealed combustion system.

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

First-Time Setup

Initial startup and system verification procedures.

1. Gas Pressure Check: Verify inlet and manifold pressures per specifications.
2. Venting Verification: Confirm proper draft and vent operation.
3. Electrical Check: Verify proper voltage and thermostat operation.
4. Sequence Test: Run complete heating cycle to verify proper operation.
5. Safety Test: Verify all limit switches and safety controls function properly.

CAUTION! Never bypass safety controls. Always test carbon monoxide detectors after installation.

Technical Specifications

• Input Capacity: 40,000 - 100,000 BTU/hr (model dependent)
• Efficiency: 80%+ AFUE rating
• Fuel Type: Natural gas or propane (conversion kit required)
• Electrical: 120V, 60Hz, 5-8 amps
• Blower Motor: Multi-speed, direct drive
• Venting: 3-4 inch mobile home approved vent pipe
• Gas Connection: 1/2 inch NPT
• Operating Temp Range: -30°F to 120°F ambient
• Dimensions: Varies by model (check specific model label)

Controls and Settings

Main control board with LED status indicators. Access door switch for service safety.

Control Board LEDs: Power (green), Heat (yellow), Fault (red).

Blower Speeds: Adjustable for heating mode (HI/MED/LO). Gas Valve: Pressure regulation and shut-off. Limit Switches: Automatic reset for over-temperature protection. Thermostat Connections: R, W, G, C terminals for standard thermostat wiring.

Operating Instructions

Normal heating cycle operation and thermostat settings.

1. Set thermostat to desired temperature above room temperature.
2. Furnace will initiate start sequence: inducer motor, pressure switch verification, igniter warm-up, gas valve opening.
3. Once flame is established, main blower will start after brief delay.
4. When thermostat is satisfied, gas valve closes, blower continues for cool-down period.
5. System returns to standby mode until next heating call.

Tip: Maintain consistent thermostat settings for optimal efficiency.

Maintenance Procedures

Regular maintenance ensures safe and efficient operation.

1. Monthly: Check air filter; replace if dirty.
2. Annual: Professional inspection and cleaning recommended.
3. Burner Cleaning: Remove and clean burners annually.
4. Heat Exchanger: Visual inspection for cracks or damage.
5. Blower Assembly: Clean blower wheel and housing.
6. Venting: Inspect for obstructions or deterioration.
7. Electrical: Check all connections and components.
8. Gas Connections: Leak test at all connections.

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

Safety Features

Multiple safety systems protect against hazardous conditions. Flame Rollout Switch: Detects improper burner flames. Limit Switches: Prevent overheating. Pressure Switch: Ensures proper venting. Flame Sensor: Verifies burner ignition. Door Switch: Cuts power when access panel removed.

Care & Cleaning

Regular cleaning maintains efficiency and safety. Use soft brush and vacuum for dust removal. Never use water or liquid cleaners on electrical components.

CAUTION! Always disconnect power before cleaning. Never operate with dirty air filter.

Regulatory Information

Certified to ANSI Z21.47 standards for gas-fired central furnaces. Mobile Home Construction and Safety Standards (HUD) compliant. For technical support, contact Miller Technical Support at 1-800-XXX-XXXX or visit www.millerfurnace.com.

Troubleshooting

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

Service: 1-800-XXX-XXXX; www.millerfurnace.com