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Boiler wont heat water past 160 degrees

Customer Question
Boiler wont heat water past 160 degrees
Submitted: 1 month ago.Category: HVAC
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Answered in 1 minute by:
12/29/2017
HVAC Technician: Rick, HVAC Supervisor replied 1 month ago
Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 23,359
Experience: 40+ yrs. experience as a licensed oil & gas technician.
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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your

issue. First I’ll need some more info so I have a more complete picture of your situation.

Is the burner firing all the time? never shuts off?

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Customer reply replied 1 month ago
burner doesn't shut off. Its a Converted Weil oil burner converted to gas. has an air intake adjustment wheel on the burner to adjust flame. I;ve tried more and less air. Also shut off all of my zones so there was no circulation to see if just the water in the boiler would heat up hotter. I popped the relief valve in case the chamber was air locked. Water is in the system as no steam is created and the pressure relief valve holds.
HVAC Technician: Rick, HVAC Supervisor replied 1 month ago

Generally if the burner doesn't shut off on high limit and it's real cold then the boiler can't keep up with the heat demand. Meaning it's undersized or in this case may be under fired.

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Customer reply replied 1 month ago
That would more be the case if it was circulating all four of my zones. It should heat up when I shut the zones down as it only has to heat non circulating water
HVAC Technician: Rick, HVAC Supervisor replied 1 month ago

yes it should shut down on limit fairly quickly if no water is circulating so it's possible the gauge or the limit control is inaccurate.

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Customer reply replied 1 month ago
That's what I thought but thought they're might be another issue. Its a dual gauge, the pressure is on the top and the water temp is on the bottom. If the guage isn't working the high limit should still cut off at some point if I don't have water circulating.
Customer reply replied 1 month ago
The pressure part of the guage is working properly as it rises if I add water through the feed.
HVAC Technician: Rick, HVAC Supervisor replied 1 month ago

Yes unless it's not working. Even if the burner is under fired (unless the flame is very weak) the boiler should shut off in a matter of minutes on limit. Temp and pressure are unrelated gauge functions. 1 can work while the other doesn't.

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Customer reply replied 1 month ago
there is no resolution to this that you know of. Even a weak flame would eventually heat the water above the limit, it would just take longer.
HVAC Technician: Rick, HVAC Supervisor replied 1 month ago

Yes, as far as a resolution you haven't given me enough confirmed info to make a diagnosis. All I can do is speculate based on your description so far.

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Customer reply replied 1 month ago
I told you all the trouble shooting steps Iv'e taken, What other information do you need?
HVAC Technician: Rick, HVAC Supervisor replied 1 month ago

A confirmed water temp. You're relying on a gauge that may not be accurate. There's no way the burner doesn't shut off on limit in a few minutes with no flow. When I say no flow I mean you have positive shut off (manual valve off) to every branch. The burner flame would have to be pretty weak for it to take more than a couple minutes

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Customer reply replied 1 month ago
Was hoping you would offer some other trouble shoot options, but it seems like I've covered them all.Still not sure what the problem is.
HVAC Technician: Rick, HVAC Supervisor replied 1 month ago

I'm completely blind here except for what you tell me. So far what you tell me doesn't add up. So until you can prove water temp there are no other trouble shooting options.

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Customer reply replied 1 month ago
I guess this isn't a suitable forum for this problem. Thanks anyway.
HVAC Technician: Rick, HVAC Supervisor replied 1 month ago

ok

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