Viessmann Solar system tied into Space Heating

GW

We have a job coming up where we'll do a vac tube system with the dual coil tank, Divicon pump station and the Vitosolic control unit, the whole shootin match, and I want to tie it into the Vitodens/space heating system. It may be a tad complicated because we'll have three radiant systems, however two of them (basement and garage) will be operated off of a non-electric actuated mixer; perhaps I can add a set point control so these pumps do come on until the solar has long since dropped out of the space heating duties?

Has anyone done one of these yet? I know the manuals show this setup in the drawings. Please advise to any tips I may need to know!

My local rep's gonna get me some info as well, but I wanted to check here with the pros.

gary

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ALH_4

solar and vitodens

I assume you are using a dual coil tank for the solar. You will need to use the 3-way motorized mixing valve for your main heating circuit. If you install a motorized 3-way diverting valve between the low loss header and a Viessmann 3-way motorized valve you can switch the diverting valve from boiler to solar using a differential control with one sensor on the outlet of the motorized 3-way and the other in the storage tank. That way you use the solar tank all the way down to the current reset temperature. Why do you need a different temperature for the basement than for the main level? If you want to keep the basement & garage off the solar you can pipe the diverting valve between those zones and the upper level.

-Andrew

GW

cellar and garage

Yes, that's my thinking. I'm quite sure the solar won't heat the house, the garage and the basement. It would be normally abnormal to heat these two areas during 'solar heating' outdoor conditions? I'm led to beleive the solar will contribute during the fall and spring (sunny days of course), so I'm not sure who would heat their garage and basement during those 'mild' outdoor conditions, or at least expect the solar to do it I should say. We're only installing two 20-tube panels. Thanks for the input

Gary

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Paul Pollets

solar info

Gary, I'd advise you to take the Viessmann solar course. Using the system to heat during the winter requires a very large array of vacuum tubes and usually a buffer tank. It's not recommended to use the system for heating because the sun's angle of inclination is the lowest when we need the most BTU's. Best used for DHW production, north of the Mason/Dixon. I have done some heating solar in Northern climes, but the budget was not restrained. Rob Waters at Viessmann is one of the solar experts. Also, try talking to Mahjouri at Thermomax. Their website is most informative.

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GW

solar

I by no means intended to run solar heating during the winter, that's what the boiler is for. I'm talking about the solar 'contributing' to the space heating requirments during mild heating conditions. Hope this clears up my thoughts, gary

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