1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your Atwood 32690 Hydro Flame Corp Medium Furnace. This 12V furnace is designed to deliver 35,000 BTU of heat, ensuring efficient warming for your recreational vehicle or similar application. Please read this manual thoroughly before attempting any installation or operation to ensure safe and correct usage.
The Atwood 32690 furnace features a tubular design residential-style heat exchanger for maximized air distribution, resulting in more even airflow and reduced hot and cold spots. Its design also minimizes air turbulence for quieter operation and increases airflow for faster heating.
2. Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.
- Ensure all gas and electrical connections are made by a qualified technician.
- Always turn off the gas supply and electrical power before performing any service or maintenance.
- Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
- Verify proper ventilation and exhaust clearance as specified in local and national codes.
- Keep the area around the furnace clear of combustible materials, gasoline, and other flammable liquids and vapors.
- Regularly inspect the exhaust system for any blockages or damage.
- Install carbon monoxide detectors in your living space.
3. Package Contents
Verify that all items are present in the package before beginning installation:
- 1 x Atwood Hydro Flame Corp 32690 Furnace Medium 35,000 Btu 12V
Note: Access door and thermostat are sold separately and are not included with the furnace unit.
4. Specifications
| Feature | Specification |
|---|---|
| Model Number | 32690 |
| Manufacturer | Atwood |
| BTU Output | 35,000 BTU |
| Operating Voltage | 12 Volts DC |
| Product Dimensions (H x W x D) | 7-3/8" x 16-1/2" x 20" |
| Item Weight | 29.6 pounds |
| Mounting Type | Vertical or Horizontal |
| Heat Exchanger Design | Tubular, residential style |
Figure 1: Atwood 32690 Hydro Flame Corp Furnace Medium 35,000 Btu 12V. This image displays the furnace unit, highlighting its compact form factor and general appearance.
5. Installation and Setup
The Atwood 32690 furnace can be mounted vertically or horizontally. Careful planning is essential for proper installation.
5.1 Site Selection and Cutout
- Ensure the chosen location provides adequate clearance for the furnace dimensions (7-3/8" H x 16-1/2" W x 20" D).
- The new Medium furnace is slightly deeper than previous 8500 series models. Verify that the existing cutout, if replacing an older unit, will accommodate the new depth.
- Maintain proper clearances from combustible materials as specified by local and national codes.
5.2 Gas Connection
- Connect the gas supply line to the furnace's gas inlet. Ensure all connections are tight and leak-free.
- Use appropriate thread sealant on all pipe threads.
- Perform a leak test on all gas connections using a non-corrosive leak detection solution.
5.3 Electrical Connection
- Connect the furnace to a dedicated 12V DC power supply.
- Ensure proper polarity and secure all electrical connections.
- Install appropriate fusing as recommended by the manufacturer and local codes.
- Connect the thermostat wiring according to the thermostat's instructions and the furnace wiring diagram (not provided in this general manual, refer to specific wiring diagrams included with the product).
5.4 Exhaust System
- Install the exhaust vent and intake according to the manufacturer's instructions.
- Ensure the exhaust is clear of obstructions and directed away from windows or other openings.
- Seal all exterior penetrations to prevent water intrusion.
6. Operation
Once installed and all safety checks are complete, the furnace is ready for operation.
6.1 Initial Startup
- Ensure the gas supply valve is open.
- Turn on the 12V DC power supply to the furnace.
- Set your thermostat to the desired temperature, higher than the current ambient temperature.
- The furnace blower will activate, followed by the ignition sequence. It may take a few cycles for the gas lines to purge air and for the burner to ignite consistently on the first startup.
6.2 Normal Operation
- The furnace will cycle on and off as needed to maintain the set temperature on the thermostat.
- The advanced design of this furnace provides reduced air turbulence for quieter operation and increased airflow for faster heating.
- Monitor the furnace for any unusual noises or odors during operation.
6.3 Shutting Down
- To temporarily shut down, set the thermostat to its lowest setting or to "OFF".
- For extended periods of non-use, turn off the gas supply valve and the 12V DC power to the furnace.
7. Maintenance
Regular maintenance ensures efficient and safe operation of your furnace.
7.1 Annual Inspection
- Have a qualified service technician inspect the furnace annually. This includes checking the heat exchanger, burner, ignition system, and all electrical and gas connections.
- Inspect the exhaust and intake vents for obstructions (e.g., insect nests, debris) and ensure they are clear.
- Check the blower motor for smooth operation and any signs of wear.
7.2 Cleaning
- Keep the area around the furnace clean and free of dust, lint, and debris.
- Ensure return air vents are not blocked.
- Do not attempt to clean internal components without proper knowledge and safety precautions.
8. Troubleshooting
This section addresses common issues you might encounter with your furnace. For problems not listed here, or if solutions do not resolve the issue, contact a qualified service technician.
| Problem | Possible Cause | Solution |
|---|---|---|
| Furnace does not start (no blower, no ignition). | No 12V power; Thermostat set too low or off; Blown fuse. | Check 12V power supply; Ensure thermostat is set above ambient temperature; Check and replace fuse if necessary. |
| Blower runs, but no ignition/heat. | No gas supply; Ignition lockout; Faulty igniter or gas valve. | Verify gas supply valve is open; Reset furnace by turning power off for 30 seconds then on; Inspect gas lines for blockages; Contact service technician for igniter/gas valve issues. |
| Furnace cycles on and off rapidly (short cycling). | Restricted airflow (blocked return/supply vents); Overheating. | Ensure all vents are clear; Check for obstructions around the furnace; Verify proper ductwork. |
| Unusual noises during operation. | Loose components; Blower motor issues; Air turbulence. | Inspect for loose panels or components; If noise persists or is loud (e.g., howling), contact a service technician. |
9. Warranty and Support
For warranty information, please refer to the specific warranty documentation provided with your purchase or contact Atwood customer support directly. Keep your proof of purchase for warranty claims.
For technical assistance or to locate an authorized service center, please visit the official Atwood website or contact their customer service department. Contact information can typically be found on the product packaging or the manufacturer's website.