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Old 10-31-2008, 11:06 AM   #1
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boiler question from a warm air guy


Some body helped a scorched air only tech here. Boiler temp has to stay a certain temp to be ready for a heating cycle

I think a hot water boiler's standing temp is like 130F*, yes?, no?

And the aqua stat keeps the boiler water from falling below the 130*F set point. Now my question is are gravity systems still being installed (IE. heating loop in the floor for the whole home.

Now if this system is still used does an aquastat till maintain water temp when no heat is actually being called for or does the burner only turn on during a call for heat

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Old 10-31-2008, 06:42 PM   #2
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boiler question from a warm air guy


My boiler doesn't maintain a low heat point. It cycles between 140 and 180F only when the tstat is calling for heat.

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Old 10-31-2008, 07:15 PM   #3
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boiler question from a warm air guy


Most hot water system boilers set for 180. aqua stat maintains the temp stat actually run zone valves and circulator , at least that is how I understand it.
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Old 10-31-2008, 07:33 PM   #4
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boiler question from a warm air guy


My boiler doesn't have a low cut-on. I think only boilers that provide heating for domestic hot water maintain a minimum temperature. When there is a call for heat my boiler cuts off at 180 and on at 165. When it's real cold outside I'll bump the high limit up to 190-200.
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Old 11-01-2008, 06:56 AM   #5
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boiler question from a warm air guy


If the boiler is providing domestic hot water by tankless coil. Maintaining temp is required.

If by indirect, if it is a high mass boiler, you need to maintain temp, if its a low mass, you don't have to.

Some guys like to maintain temp, to prevent condensation in the boiler from cold starting.

Primary secondary piping can provide the same protection in some applications.
Others need a tempering loop.

Always follow manufacters return water temp guides.

Many boilers don't do well with 20 to 30 minutes of 90F return water temp.
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Old 11-01-2008, 11:25 AM   #6
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Old 11-01-2008, 12:25 PM   #7
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LOL...

Which part is confusing.
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Old 11-01-2008, 01:16 PM   #8
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boiler question from a warm air guy


The part where a pinhole in a super heated steam line can cut a guy in half
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Old 11-01-2008, 06:23 PM   #9
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Quote:
Originally Posted by hvaclover View Post
The part where a pinhole in a super heated steam line can cut a guy in half
Atleast there is no bleeding when that happens.

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