Ultar 155 boiler with buderus dhw

I am installng a weil mclain ultra 155 boiler with a buderus dhw, the intallation directiuons vary depending on if u use the ones of weil mclain or the buderus ones. Can anyone give me the diagram that I should follow. The buderus show using a seperate expansion tank air eliminator ext. I am also using the weil mclain ez up manifold.
On the EZup manifoild does the loop end on each side the supply and return or do u continue the loop back to each other I am using taco zone valves.

 

Either way. I like that way best.
Boiler Piping
See figure 5

 

The ez up link is here. Not sure what you are talking about the loop end.

http://www.weil-mclain.com/en/multim...p-manifold.pdf

Pipe as per page 16 figure 15.

http://www.weil-mclain.com/en/multim...ler-manual.pdf

What buderus dhw do you have? If your potable water is a closed system yes put a expansion tank on it.

Mike NJ

 

on the ez up manifold one end is the supply one is the return on the supply side I need to put a expansion tank then on the dhw opening I also need another expansion tank correct?
yes it is a closed system buderus dhw
after the zone valves are installed does the end of the supply eventually loop back and get connected to the return like a primary loop or is the priamry loop considered already made up in the manifold? I never used one of these pre made manifolds before

 

Lets step back one moment. In this pic the horizontal pipe at the top is the supply to your heating loops on the right. After it goes through your heating loops it will return to the left side of the horizontal pipe.



Now one expansion tank will be installed on the supply side under the air seperator that shows how your system should be piped on page 16..figure 15.....This expansion tank is for your heat/boiler.

Open this link and look at page 16...figure 15. You should have this manual with the boiler.

http://www.weil-mclain.com/en/multim...ler-manual.pdf

Now for your buderus dhw. You see in the diagram above they dont show another expansion tank. You only need a expansion tank on the DHW tank if there is a pressure reducing valve where you main water line comes into the house. Some may be outside at the water meter.
Does your current set up have a expansion tank? If so I would just go ahead and intall one. The pressure reducing valve at your incoming water main will look like this.

If you have this then you need an expansion tank piped to the pipes #23 in the diagram 15..page 16 in the link above.



Page 13 here for the expansion tank explanation and page 16 for diagram.

http://www.buderus.us/files/20101013...al-2010-10.pdf

Mike NJ

 

thank you very much u answered my questions, I didn't think I needed an expansion tank on the dhw although the buderus install instructions showed it. I have well water so the well expansion tank serves as it. The Buderus installation showed using a seperate expansion tank just for the dhw.

 

one more question I am using the bell & gosset flow control valve I think that is shown as item number 10 on the diagram u told me to look at. They show using 2 on that diagram 1 for dhw 1 for heating it is still necessary to use 2 when using the ez up manifold, if not they one would just be used on the heating side I would guess.

 

the buderus instaalation instructions showed using a seperate expansion tank tank just for the dhw on the bioler side, I have well water so I know one on the cold water inside is not needed. I was just wondering in summer use when the heast is not used there would be no air seperator or expansion tank for the dhw is why I was wondering why the buderus instructions showed a seperate one and the weil mclain installation manual did not.

 

opps forgot to iclude the buderus dhw model number ST200/2

 

Yes on the two flow controls. You are using two circs. One for DHW and one for boiler. This is how Weil maclain shows it but you may be able to put a zone valve where the circ for DHW is, but that is out of my knowlage and I will be reading for hours if I try to investagate why. I am the type of person that pipes how the manual says.These engineers put these diagrams in place for a reason. Plus I think you can only run so many zones and circs from the electronics that are in this boiler.

Mike NJ

 

OHHH!!!! sorry to hear your on a well. Do you know your water chemistry??? That boiler will not last long if you have PH and hardness issues which most well water has. I would of went with cast iron.

Good luck.

Mike NJ

 

last question the buderus manual shows the circ going towards the dhw the weil mclain shows it going towards the boiler I am installing the boiler side on the return as shown on the ez up manifold directions, can I have trhe dhw on the supp;ly side of the ez up going towards the dhw and the one on the boiler ciruclating down into the return, seems the same to me but want to double check. And if the dhw circ goes towards the dhw would the flow control valve go after the circ? The orinal boiler that was installed was done wrong and never worked right so I couldn't use as much as a guide I have redone all the plumbing, thanks a million for your help

 

no I have 2 water systems no ph or hardness issues, it sucks that plumbing and heating guy really did a mess on the last boiler it was also a weil mclain cgi bboiler and was less then 10yrs old, it constantly cycled on and off eating bills were off the hook, it quit so I am without heat except for fireplace so thanbks alot for your help

 

Well the buderus shows two circs. One for the boiler to the DHW and one for a recirc so you have hot water at the faucets instantly.

I would pipe to the weil Mclain diagram because of the boiler circ for the weil Mclain.

I WOULD PIPE ALL AND EXACTLY WHAT WEIL MCLAIN SUGGESTS.

Mike NJ

 

I read your other post and a 10 yr old boiler is young. I think you may have had issues that could of been solved with that one. Now you are spending alot of money on a more efficiant boiler but you may experience the same thing.

Like a doctor find a cure for the symptom. Dont just treat the symptom.

What size was the old boiler? How many sq ft is the house? How much heating element? Did they do a heat loss calculation of your home? The old boiler may have been oversized and there are cheap devices out there that would have saved you energy.

I am only saying because I know what it costs to install ultras and it may take years to recoup the costs. My boiler is 30 plus yrs and I dont think I would trade it for any new technology. I will be 6 ft under before I realize any savings with swapping out my boiler. Well maybe sooner then you all because I would do the labor my self.

If I installed a ultra in my home tomorrow it will take me 6 yrs to recoup my cost. And I am installing. If I hired someone it would take 12 yrs. I baseing it on a $250 a yr savings. I can put a ultra in my home and it may cost me total out of pocke $3000. Where homeowners pay $10000 plus for these installs.

Do the math.

Mike NJ

Thats just me. You really have to do the math....

Mike NJ

 

There were a few things wrong with the old boiler the blower motor was shot, along with the control board and one other thing I forget some kind of switch. It was gonna cost me over 2000.00 the havac said so I did the swapout myself and with the 1300.00 rebate and another 300. rebate from the gas co I figured it was worth the additonal cost. I got the boiler at plumbers cost since I have a business. I will have to let you know if it all is worth it, which I sure hope. I probably have about 4000 into the heating system with re-doing alot of the baseboard adding 2 more circulators etc plubing then subtract the rebates.