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boiler loop
buzzy
Member Posts: 8
i,m installing a new low mass gas boiler into an existing system{old house},i recently learned that 2 close coupled t's should connect the existing system ,then my new boiler would connect to the t's,which requires the existing circ pump to run the existing system while the new pump {manufacturer recommended}would run only the boiler loop,is this right and should they be wired to run at the same time,boiler pump runs on call for heat,
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Whose Boiler
Whose boiler is it? I take it you are zoning with zone valves. In that case yes. The boiler pumps job is to move the water through the boiler the system pumps job is to move the water through the system. They both should run at the same time. What are you doing for domestic hot water?There was an error rendering this rich post.
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no zone valves,one thermostat in whole house,domestic water is seperate[elec]0 -
Boiler?
What make and model boiler? What is the heat loss of your home? What pump did you use for the boiler pump?There was an error rendering this rich post.
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weil-mclean cgi-4,not sure of the pump size,i,m at home now0 -
?
Now I'm really confused. There is no need to primary/secondary this boiler. In case you lost the install manual it is attached. I would strongly suggest you get a pro in your area.There was an error rendering this rich post.
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i am a contractor,i recently attended a 2 day introduction to hydronic heating installation course,while looking back at the course manual it clearly states to do what i suggested,but it does not explain how the pumps should run,hydraulic independence0 -
Not meant to Offend
Sorry didn't realize you were a contactor The boiler you are installing does not need primary/secondary unless you are trying to protect the boiler from cold return water temps because your seconday loop is delivering lower than 140 degree return water temp. If your system is radiant, you are doing outdoor reset, injection pumping etc you may need it but other than that it is not necessary. Here are a few links that may help you understand the reason of why pri/sec is necessary.
http://www.pmengineer.com/CDA/Archives/9c4975fa31298010VgnVCM100000f932a8c0____
http://www.comfort-calc.net/primary-secondary_piping_tutorial.html
If you want a really good book go to Dan's Shop and find Modern Hydronic Heating Second Edition. Best and only reference you may find you will ever need. The installation manual I attached in the previouse post gives you the recommended piping for different applications. You should always fall back to the manufacturers manual when you are in question so that you do not void any warranty due to improper installation. Page 40 shows you how to wire. To answer your original question. Wire boiler circ as show and wire your zone therm to a single zone circ relay take the end switch from the relay to TT as shown. Boiler circ will run on a call for heat.There was an error rendering this rich post.
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