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Boiler bypass plumbing diagram (Read 18453 times)
Victorious1_1
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Boiler bypass plumbing diagram
Nov 24th, 2004, 5:53pm
 
Hello, I'm replacing my old ineffiecient boiler with a newer hi efficiency boiler with domestic water heating.

Does anyone here have a diagram of a bypass line and valve setup?  What exactly is the bypass function and how is it adjusted for optimum efficiency?

Your experience is greatly appreciated.

Vic
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The_Trician
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Re: Boiler bypass plumbing diagram
Reply #1 - Nov 24th, 2004, 6:06pm
 
Don't do it Vic - Put up with the inefficiency mate - I made that particular mistake - chucked a perfectly servicable Glow worm away in favour of a Baxi Combi.

Boy oh boy do I regret doing that, Had nothing but trouble with it since.

TT
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Victorious1_1
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Re: Boiler bypass plumbing diagram
Reply #2 - Nov 24th, 2004, 7:54pm
 
What kind of problems did you run into TT?  

The boiler I've purchased is a high quality unit that has proven itself over the course of two years of operation.

I bought it used.  The reason it is used is because the person that owned it passed away, then her house was torn down, but, the boiler was salvaged because it was so new.

The factory is aware of how I purchased it and will stand behind the warranty.

Basically all I need is an accurate plumbing diagram so that I can properly incorporate the bypass system. My current boiler does not have a bypass installed I would imagine due to its age.

Vic
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billythekid
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Re: Boiler bypass plumbing diagram
Reply #3 - Nov 24th, 2004, 7:57pm
 
Do you have the paperwork for the boiler, check it actually needs a by-pass. If so, many installers just make one radiator "always on" with 2 lockshield valves rather than one lockshield and one regular valve head. Usually the bathroom rad, but can be done theoretically on any. Wont work on a one pipe system, which i doubt is what you have.
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Victorious1_1
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Re: Boiler bypass plumbing diagram
Reply #4 - Nov 24th, 2004, 8:01pm
 
In the paprework it does recommend a bypass so that 160 degrees F. will be maintained in the boiler for domestic water supply and so that the technician can be assured of the return water temperature.

None of my baseboard heaters have a valve to turn them off like the radiator types do. Possibly I do not need a bypass on this type of system.

Vic
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« Last Edit: Nov 24th, 2004, 8:05pm by Victorious1_1 »  
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supersparky
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Re: Boiler bypass plumbing diagram
Reply #5 - Nov 24th, 2004, 8:11pm
 
would you not need to be corgi to change the boiler?

ss
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Victorious1_1
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Re: Boiler bypass plumbing diagram
Reply #6 - Nov 24th, 2004, 8:16pm
 
Possibly, but, here I'm just talking theory and not actually installing it.

Vic
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billythekid
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Re: Boiler bypass plumbing diagram
Reply #7 - Nov 24th, 2004, 8:16pm
 
yes for the boiler change a corgi regd installer would be required, but not for the bypass.
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billythekid
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Re: Boiler bypass plumbing diagram
Reply #8 - Nov 24th, 2004, 8:17pm
 
by baseboard do you mean warm air heaters?
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Victorious1_1
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Re: Boiler bypass plumbing diagram
Reply #9 - Nov 24th, 2004, 8:25pm
 
What I have inuse at this time is a 1" pipe that circles my basement.  This 1" pipe feeds to "T's" on the pipe that circles the basement, to the radiators, in each room of the house,  that are made of 1/2' copper pipe with aluminum fins across the length of the pipe.  There is a door in each radiator that controls the air flow through the radiator, unlike other types that regulate temperature by turning water flow off or on.

What I'm asking is on this type of system is that bypass line and valve necessary or can the pump do the job of keeping the return water temp at 160 degrees F?

Vic
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« Last Edit: Nov 24th, 2004, 8:29pm by Victorious1_1 »  
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billythekid
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Re: Boiler bypass plumbing diagram
Reply #10 - Nov 24th, 2004, 9:18pm
 
if there are no valves and no means of isolating it, it sounds like its already a 'big' bypass all on its own. One pipe system.
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Victorious1_1
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Re: Boiler bypass plumbing diagram
Reply #11 - Nov 24th, 2004, 11:00pm
 
Therefore in essence, if the Lo setting is 160 degrees F. the return water should always be essentially 160 F. because it is in a continuous bypass pattern, correct?

If this setup did not prove to maintain the return water temp. at 160 F., then I would have to regulate return water temperature by using the circulating pump?

Thanks for your experience and knowledge.

Vic
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thescruff
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Re: Boiler bypass plumbing diagram
Reply #12 - Nov 25th, 2004, 12:01am
 
[quote author=Victorious1_1  link=1101318798/0#11 date=1101337200]Therefore in essence, if the Lo setting is 160 degrees F. the return water should always be essentially 160 F. because it is in a continuous bypass pattern, correct?

If this setup did not prove to maintain the return water temp. at 160 F., then I would have to regulate return water temperature by using the circulating pump?

Thanks for your experience and knowledge.

Vic
[/quote]

Not correct the return will be lower depending on the heatloss which is quite a bit with finned rads.

but then you want it to be lower anyway.

scruff
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Victorious1_1
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Re: Boiler bypass plumbing diagram
Reply #13 - Nov 25th, 2004, 12:38am
 
Hi scruff, if what you are saying is correct, then I must need a bypass line and valve to maintain return water temp at 160 F.

Maintaining that 160 F. return temperature is critical to domestic hot water supply as well as to boiler longetivity.

How would you, scruff, set it up so that the return water temp would always be at 160 degrees F. ?

Vic
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The_Trician
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Re: Boiler bypass plumbing diagram
Reply #14 - Nov 25th, 2004, 1:13am
 
I wouldn't have thought you'd be able to achieve this - simple laws of physics dictate that you will inevitably encounter and accumalate losses - heat or otherwise, from the start to the end of the system.
Unless you have something along the lines of a perpetual motion machine which is totally free of losses of any kind!

Whatever means you have to provide heating to the rooms will inevitably give up heat to atmosphere as the hot water circulates, so you'd have to begin by delivering the heated water at a lot higher temperature than the temp you eventually wish to achieve on the return.

So there is a clue to your starting point.
Insulation, plus a larger boiler possibly?

One for a REAL heating engineer methinks.
Though I cannot understand why you need to dictate the fact that the 167' value HAS to be maintained?

TT










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Victorious1_1
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Re: Boiler bypass plumbing diagram
Reply #15 - Nov 25th, 2004, 1:36am
 
Maybe a picture will help you understand what I' m trying to achieve, but, I can't figure out how to insert a pic here.  Can anyone help?


All I need to do is keep the return water temp up to a minimum of 160 F. while the outlet temp is 190 F.

If a bypass line is installed, the outlet water will immediately go back into the boiler and maintain the return water temp as it mixes with the colder return water.

What I need to know is what are the different methods of plumbing that I may choose  to accomplish this bypass.

Vic



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« Last Edit: Nov 25th, 2004, 1:42am by Victorious1_1 »  
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bripl
Re: Boiler bypass plumbing diagram
Reply #16 - Nov 25th, 2004, 9:45pm
 
you will need to regulate the flow by cutting in valves to the feeds to the baseboard [skirting heaters] to regulate the temp across the heaters.would be more cost effective to alter to a two pipe sys and incorperate a abv to maintain the temp difference
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