Munchkin Installation Question

David Toppin

Good afternoon wall,

I have a Munchkin install question. I presently have an old heating system with five zones and circulators on each zone that are called by the thermostats which I believe are 120 volt. Is it OK to leave the circulators controlled like that? It also appears in the Munchkin installation manual that it needs to be a one pipe system? I'm referring specifically to the "closely spaced tees" in Drawing 2C in the manual for the 199M. Is the return and the supply actually supposed to be hooked together at that point?

Thanks


Dave

hot_rod

it depends

Dave,

You can do your secondary piping as you've mentioned and work from hottest zone demand (such as an indirect) to coolest (perhaps a SOG rad zone). Or if all of the zones require the same temp, you can use one set of closely spaced T's and create a manifold branch with the first being your five circs and the second picking up all the returns. That way, all five will see the same supply temps. Flow checks are a must with the second option and (possibly) optional with the first.

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GW

I don't think that's what he meant

Unless I got lost in the translation, he's talking about the boiler needing to be injected. If I'm on the right track David, then yes, you'll need to get the Taco 0010 or whatever pupm they recommend, and inject as the diagram states. You'll build an 1 1/4 header if you don't already have it, and at that point all the zones call do what they're doing now.

Gary

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hot_rod

A picture's worth a thousand words!

Sorry, didn't mean to be confusing. Here's what I meant.

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Rookie

Great Diagram

David I'm a fan of the feed and return taken right off the primary manifold, this elimates any flow problems with older systems. I'm interested in the manifold off of the primary with the bank of circulators, are you using a reverse return on the return side?

Dave Yates (PAH)

depends

If those are five zones for single piping (such as 3/4" BB) I size the manifold for full flow & don't worry about RR piping. On the other hand, if the circs are feeding manifolds (like a 4-tube pex floor circuit), I'll always utilize RR on the pex circuits to balance flow. If thay're of equal length, I can use dumb (without flow meters) manifolds to save $$$.

Watch out for total GPM on the primary loop though to ensure those secondary pumps can't exceed the primary GPM rate. Funny things can happen when commonly manifolded circs begin hunting for missing GPM's!

The Wirsbo ADS program has a nice flow/head calculator for quick as lightening calcs.

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