The heating furnace is not burning properly; it’s using gas instead
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Both the outlet temperature of the furnace and the temperature inside the furnace chamber are dropping. A cascade control system is in use for the furnace outlet and the gas supply; the gas control valve is almost fully open, yet the temperatures continue to drop. On-site inspection revealed that the burners inside the furnace chamber were causing damage to the furnace tubes, and the situation was quite severe. The gas supply was switched to manual control, with the setting reduced from 97% to 75%, and as a result the situation improved – the temperatures inside the furnace chamber and at its outlet began to rise. Has anyone encountered a similar situation? Please share your experiences
Adjust the air valve; it’s likely that there isn’t enough air supply, resulting in incomplete combustion