Experiencing excessive smoke from your Herman Nelson BT400 NEX-G heater can be concerning and may indicate underlying issues that need attention. Addressing these problems promptly ensures your heater operates efficiently and safely. In this guide, we’ll walk you through common causes of excessive smoke and provide practical solutions to resolve them.

Common Causes of Excessive Smoke

1. Restricted Airflow

   Cause: Obstructions in the air intake or exhaust system can limit airflow, leading to incomplete combustion and smoke production.

   Solution: Regularly inspect and clean the air intake and exhaust areas. Remove any debris, dust, or blockages to ensure unobstructed airflow.

2. Engine Operating Below Normal Speed

   Cause: An engine running at lower than optimal speeds can cause inefficient fuel combustion, resulting in excessive smoke.

   Solution: Check the engine’s RPM and adjust it to the manufacturer’s recommended settings. Regular maintenance and timely oil changes can help maintain proper engine performance.

3. Incorrect Fuel Nozzle Spray Pattern

   Cause: A malfunctioning or dirty fuel nozzle can disrupt the spray pattern, causing improper fuel atomization and smoky exhaust.

   Solution: Inspect the fuel nozzle for signs of wear or clogging. Clean or replace the nozzle as necessary to ensure a proper spray pattern.

4. Carbon Buildup in Exhaust System

   Cause: Over time, carbon deposits can accumulate in the exhaust system, restricting airflow and leading to smoke emission.

   Solution: Perform regular cleaning of the exhaust system to remove carbon buildup. This maintenance step helps maintain optimal airflow and reduces smoke.

5. Excessive Fuel Pressure

   Cause: High fuel pressure can lead to an overly rich fuel mixture, causing incomplete combustion and smoke.

   Solution: Check the fuel pump and adjust the fuel pressure to the specifications outlined in the user manual. Proper calibration ensures efficient fuel combustion.

Preventive Measures

• Regular Maintenance: Adhere to a routine maintenance schedule, including checking and replacing air filters, inspecting fuel lines, and ensuring all components are in good working condition.

• Use Quality Fuel: Utilize clean, high-quality fuel to prevent contaminants from entering the system and causing combustion issues.

• Monitor Performance: Keep an eye on your heater’s performance. Unusual noises, reduced efficiency, or increased smoke are indicators that maintenance is needed.

By understanding the common causes of excessive smoke and implementing these solutions, you can ensure your Herman Nelson BT400 NEX-G heater operates efficiently and safely. Regular upkeep not only resolves current issues but also prevents future problems, extending the lifespan of your equipment.

If you continue to experience issues or need further assistance, don’t hesitate to reach out to our expert team. We’re here to help you maintain optimal performance of your heating equipment.