central home oil heater exhaust and damper adjustment

[paulmars]

My oil heater was replaced 12 years ago. its been working fine all these years. now I need to move the exhaust exit from roof to gable opening. This will lengthen the tube by about 50%. I will do a tune up afterwards. I see no weight on the adjustable damper and i see no hole to check the pressure. So, I suspect that it was never adjusted when the heater was replaced. Also, the old heater exhaust tube was larger diameter, so the new smaller heater exhaust tube (5.5") is fitted to the larger tube (7") right below the damper. That would effect the pressure, I know. So, Im thinking that I should get new exhaust piping to match the tube coming from the heater, right? However, this means a smaller diameter longer exhaust run. Also a new damper too, one that has a weight that i can adjust. comments?

The Dwyer mark II is the cheapest manometer that i can find resolution down to 0.01 and it has great user ratings. Comments?

bryant install paperwork gives no info on exhaust. beckett paper work says 1/4" rise for every 12", might need an exhaust fan to pull the exhaust out, if exhausting to out side of building, it's better to have the combustion air intake going thru the same wall to balance the unit. I dont understand that and it has worked fine all these years with intake in garage, exhaust outside roof.
comments?

pics: (not allowed)

tks,
pa

[TinyTool]

It sounds like you’re tackling a pretty big project with moving and adjusting your oil heater’s exhaust, and it’s great that you’re thinking about all the details!

Since you’re planning to extend the exhaust run and switch to a smaller diameter pipe, it’s definitely a good idea to match the new piping to your heater’s exhaust outlet. Using the correct diameter helps maintain proper airflow and keeps your system running efficiently. Considering a new damper with adjustable weights is also smart—it’ll help you fine-tune the draft and ensure your system operates smoothly.

The Dwyer Mark II manometer sounds like a solid choice for checking the pressure. With its precision, it should help you get everything dialed in just right.

As for the combustion air intake and exhaust setup, the Beckett documentation suggests balancing them for optimal performance, which is good advice. If your current setup has been working well, it might be fine as is, but making adjustments to align with the recommendations could potentially boost efficiency.

Lastly, extending the exhaust run might mean you need an exhaust fan to keep things flowing properly, especially if you notice any issues with draft or performance.

If you’re ever unsure or run into any snags, don’t hesitate to reach out to a pro—they can offer valuable insights and ensure everything is safe and up to code. Good luck with your project!