Budeerus GB142 Questions

Jamie_6

Yes Sir I did, and what a great class it was! We also have installed a few of these bad boys.

Jamie

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John McArthur_2

Questions on first install

I just went to help a friend with our first GB142 install and have a couple of questions.

First, does the DHW circulator need to be a high-flow to allow adequate flow across the HX?

Second, can he use a smaller pump on the in-floor loop since it does not go through the boiler? I don't see a problem with the 007 IRC that he has installed now because it only supplies the infloor zones of a small residence with minimal head loss and the boiler is connected via closely spaced tees. Just want to be sure.

Third, can we use a tekmar 10K sensor for the outdoor sensor or is there a specific one for Buderus?

Last, he has a RC10 control but he did not pre-wire for it. He has standard 24v Honeywell t-stats. Can he or should he try to install the RC10.

I checked the Buderus web site but did not find the info I wanted. I plan on installing several of the GB142's and need to get the bugs worked out.

The install is in a 1,400 sqft house with high-mass radiant floors and a 60 gal indirect at about 8,000' elevation in Colorado.

Thanks for any assistance.

Jamie_6

J,

If you look in the instillation instructions Buderus tells you what pump to use with there indirect.

You are right about the second question. It does not matter what pump you use out side of those closely spaced tees for the boiler. (Just as long as the pump can handle its attached load!

I do not think that the GBs have the capability for outdoor sensing (yet) so that Tekmar sensor will do you no good.

Lastly, the RC10 is a slick control but it can only be used for one area. What we have done is placed the RC10 in the room with the largest load and let that area drive the whole system. Then we place normal stats through out the house tied to zone control panels. But we do not tie the zone control panel to the boiler. Since that RC10 tries to make that large zone have a consistent call for heat the smaller zones handle there loads with no problem.


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John McArthur_2

Thanks for the reply. I don't have all of the manuals because the job is a friend's. The manual I do have indicates the use of an outdoor sensor but does not specify a particular one.

Thanks for the tip on the RC10. I presume I can wire it to the boiler and leave the existing zone valve in manual if it attempts to provide constant circulation. The manual indicates the use of an outdoor sensor with this control.

Looks to be a really slick unit. I like the boiler control board more than the Vitodens.

Joe@buderus

GB142 answers

Jamie, you are right on the mark with the answers! Did you attend the training classes? Thanks for the help!