Heating Help

thermic bypass and other questions

Are theses thermic bypass valves always included in boilers systems manifolds or just when using condensing cast iron boilers? Hi, I am designing a 5 zone system w/3zone infloor, fan watercoil, indirect DHW, on a new buderus 125kbtu boiler Am gettin conflicting advice on whether to use mixing valves to each infloor zone, whether to use individual circs or 1 circ and zone valves and just how to prioritize the DHW. Any input to shed more lite on the subject? Plus it all needs to come together on the wall like a work of art(demanding client even painted the wall for mounting all the manifold systems) BTW, I used Onyx tubing & it's so easy to work w/ when laying down radiant floor tubes. I see most everyone using pex which seems abit stiff. Just My 2 cents worth. STormin

I would install a low water cut off on the supply riser before the union. Thanks Ray M

Is a LWCO typical even with a auto-fill system that is left on? Tim

LWCO

> Is a LWCO typical even with a auto-fill system
> that is left on?
>
> Tim

The LWCO in westchester county n.y. is code. You wont pass with out it. Thanks Ray M

A LWCO anywhere in NY state

is code and it's just a good idea. Nice work Timco. Mark H To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Just wondering...

> Just have the returns and the gas to finish, and
> the controls. I should be able to fire it
> tomorrow. Any suggestions?
>
> Tim

Looks real nice. Besides the LWCO (I believe it was mandatory per code 2003), why all the foil tape on the single wall vent connector? Are you sure single wall connectors are allowed by the Vent Tables ? How about the appliance with the lowest input being first into a common manifold ? Other than some vent questions, looks nice. I like that Xtank mounting. Just noticed the tee on the water heater what else is on that manifold. I think we need to recheck the Vent Tables. What do you think?

I posted a second ago...Which code deals wit the order of introduction into the manifold? I will bring in my IFGC book. Only two WH's and the boiler. Foil tape comes off. It was temp because helper ran out of screws. It got the cust hot water.... T

nice

Looks nice and neat. Well thought out. Quality parts too. And I like the expansion tank install. What's with the silver tap? Is it rated for high temp? And what is the item on the bottom of the primary loop which ties in to the bottom tee? I'm interested. To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"

Ted

That is a Danfoss ESBE Thermic bypass valve. As installed it will bypass the system, and return all water back to the boiler until the return temp hits 140. It will respond to cold water return temps from the system by adding hot water from the supply header. I really like them, they are simple and only ever had one callback one one. It uses what looks like a standard automotive coolant thermostat, (well I'm talking Ford/Chevy/Dodge anyway) I have the same questions as above on the LWC, the tape, and the Exhaust manifold. I also think the taco circ on the primary needs to be rotated so the wiring box is on the side instead of the bottom where it may be damaged by water leaks per manufacturer. Looks like you spent a lot of time on it, looks very neat and proffesional. I like the expansion tank mount, that is not going anywhere soon, and easily accesible for service. I also like the drain port under the air eliminator. We all look at our installs after we are done and see where we can make improvements..... Cosmo

That is a TV valve. See the post 'ever use a TV?' My helper ran out of screws...and taped it. Needed to get them hot water. I am hoping the tape will come off after it gets hot. Could you point me to the code that concerns the smallest appliance being first? If it needs to be changed, I will. I have had many inspections now and never been asked about a LWCO. Just 30# relief & backflow & vent size. The rest is totally greek to our inspectors here. Thanks for the words...I really try, you know! Tim

Mark that too was my first thought

but after zooming in on the pic it looks like Black, I agree on the galvy and good install Tim

National Fuel Gas Code..

Section 7.10.4 paragraph C Vent Tables Section 11. Gotta go.. keep up the good work BTW combustion air provisions 50 cubic feet per 1000 input?? for unconfined space definition..

I am good on combustion air & and makeup air, but cannot find the code section you refrenced.Ihave Chimneys & vents as section 501, chapter 5. tables are 504. Any ideas why the two IFGC would be so different? I would like to read this & learn! Thanks again, Tim

Nice work Tim

While you are finishing the fuel line for the boiler maybe you could repair the fuel line on the water heater. Customer would probably like to get rid of that flex connector.

Just have the returns and the gas to finish, and the controls. I should be able to fire it tomorrow. Any suggestions? Tim

Near boiler piping...

is that Glavanized steel pipe on the near boiler piping? After seeing what happens in open potable DHW systems with galvy pipe, I never considered it much good for anything but fence posts :-) Nice clean install. ME

I'm learning

what is that piping method? Is that primary-secondary? If so, why the bypass valve? Is this a converted gravity?

Yes it's P/S

And a nice example too. The thermic bypass is to allow the boiler to warm up, much the same way your car does. It recirculates the water inside the boiler until it is warm enough and then lets it through for the heating circuit. The boiler runs better and cleaner this way.

Don't apologize

You have no reason to feel bad, your work is top shelf. You asked for suggestions and we gave them. I could show you some of my jobs that were done ASAP, and when time permitted went back and corrected. The tape is a good idea in lieu of screws, I would have done the same thing. You are a brother wethead.... we are FAMILY!! (think Pointer Sisters) Cosmo

Near boiler piping...

is that Galvanized steel pipe on the near boiler piping? After seeing what happens in open potable DHW systems with galvy pipe, I never considered it much good for anything but fence posts :-) Nice clean install. ME