Atwood Hydro Flame Furnace Manual MPD 32025

The Atwood Hydro Flame Furnace MPD 32025 is a high-efficiency RV furnace designed for reliable heating performance in recreational vehicles. This forced-air furnace features electronic ignition, variable speed blower, safety shut-off systems, and compatibility with 12V DC power systems. Below are key sections for safety, features, installation, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Electronic ignition system, variable speed blower motor, heat exchanger, combustion chamber, thermostat control, safety shut-off switch.

Installation

Unpack and inspect all components. Ensure proper ventilation and clearance.

1. Select mounting location: Choose well-ventilated area with proper clearances.
2. Install mounting brackets: Secure brackets to RV frame using provided hardware.
3. Connect gas supply: Use approved gas line and fittings; check for leaks.
4. Electrical connections: Connect to 12V DC power source with proper fuse protection.
5. Vent installation: Install exhaust and intake vents according to specifications.
6. Ductwork: Connect heating ducts to outlet plenum.

WARNING! Installation must be performed by qualified technician. Ensure proper ventilation to prevent carbon monoxide buildup.

First-Time Setup

Complete installation checks before initial operation.

1. Gas pressure check: Verify proper gas pressure at furnace connection.
2. Electrical test: Check 12V DC power supply and grounding.
3. Ventilation test: Ensure clear exhaust and intake pathways.
4. Initial startup: Follow lighting procedure in operation section.
5. Temperature calibration: Set thermostat to desired temperature range.
6. Safety check: Verify all safety systems are functioning properly.

CAUTION! Never bypass safety systems. Test carbon monoxide detector before use.

Specifications

• Model: MPD 32025
• BTU Output: 25,000 BTU/hour
• Fuel Type: Propane/LP Gas
• Electrical: 12V DC, 4.5 Amps
• Airflow: 120 CFM maximum
• Dimensions: 17.5" x 10.5" x 9.5"
• Weight: 18 lbs
• Exhaust Vent: 2-inch diameter
• Operating Temp Range: -40°F to 120°F
• Gas Pressure: 11" water column

Controls and Settings

Thermostat control: Set desired temperature. Manual override switch for testing.

Operation Modes: Auto (thermostat controlled), Manual (continuous operation), Test (service mode).

Blower Speed Settings: Low, Medium, High for different heating requirements. Safety Controls: High limit switch, roll-out switch, pressure switch, flame sensor. Ignition System: Direct spark ignition with trial for ignition period. Gas Valve: Regulates gas flow with manual shut-off option.

Connecting to RV Systems

Gas System: Connect to RV propane system with approved fittings. Electrical: 12V DC connection to RV electrical system. Ventilation: Exhaust and intake vent connections.

1. Turn off all power and gas supply before making connections.
2. Use thread sealant approved for gas applications.
3. Ensure electrical connections are secure and properly fused.
4. Test all connections for leaks before operation.

Tip: Use gas leak detector solution to check all gas connections.

Operation

Normal heating cycle operation procedure.

1. Set thermostat to desired temperature.
2. Furnace will initiate startup sequence when temperature drops below set point.
3. Blower motor starts for pre-purge cycle.
4. Ignition system activates spark ignition.
5. Gas valve opens; burner ignites.
6. Flame sensor confirms ignition; main blower activates.
7. Heating cycle continues until thermostat satisfaction.
8. Shutdown sequence: Gas valve closes, blower continues for post-purge.

WARNING! Never operate furnace with cover removed. Ensure proper ventilation at all times.

Maintenance Procedures

Regular maintenance ensures optimal performance and safety.

1. Monthly: Check vent system for obstructions.
2. Seasonal: Clean burner assembly and heat exchanger.
3. Annual: Professional inspection of all safety systems.
4. As needed: Replace air filter and check electrical connections.

Maintenance Schedule: Visual inspection monthly, thorough cleaning annually, professional service every 2 years.

Safety Features

Multiple safety systems protect against hazardous conditions.

• High Limit Switch: Shuts off burner if overheating detected
• Roll-out Switch: Detects flame rollout condition
• Pressure Switch: Ensures proper venting before ignition
• Flame Sensor: Confirms burner ignition
• Overcurrent Protection: Electrical circuit protection
• Thermal Fuse: One-time use safety device

Emergency Shutdown: Turn off gas supply and disconnect power immediately if abnormal operation detected.

Regulatory Information

Certified to ANSI Z21.44 standards for RV heaters. CSA International certified. Complies with NFPA 1192 standards for RV safety. Manufactured by Atwood Mobile Products. For technical support, contact 1-800-888-3378 or visit www.atwoodmobile.com. Keep this manual for future reference.

Troubleshooting

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

Service: 1-800-888-3378; www.atwoodmobile.com