How should Burnham V8H be configured with an indirect hot water heater?

mgx42

I have a service contract with my oil company. When I bought my house it had an existing Burnham V8H3 burner that used a tankless coil for domestic hot water. I had my oil provider install a Bradford White 50gal indirect with its own zone. I noticed that my burner is still short cycling for about 3mins every hour with my baseboard heat turned off and without us using any hot water. The burner aquastat is set to 160L, 180H, and 10D. The Bradford is set to 130f and has a mixing valve. I called my oil provider and complained about the burner clicking on every hour for 3mins. They sent someone out, who said the settings are fine and that it’s normal for it to do that. Got to the point where I got a phone call from the installation manager who reiterated the same thing. He said maybe in May they can drop the burner’s low point to 140f but he doesn’t recommend going lower than that. He also said he does not recommend a cold start configuration on cast iron boilers for a number of reasons. Worth noting I live in NY and winter is approaching, so that was another point they made to keep the aquastat on the burner as-is. I just feel like hourly short cycles is excessive and is wasting fuel. Would really like the opinion of someone on here.

Robert O'Brien

Turn LL as low as it goes, the indirect will call often enough to keep the boiler warm without maintaining 160F 24/7

mgx42

https://forum.heatinghelp.com/discussion/comment/1909409#Comment_1909409

Thanks Robert. Do you recommend changing the differential on the burner too? Or just the low point?