Design help.

Wayco Wayne_2

I want to run on the low temps, (122 F @ 10 degrees outdooe temps) as much as possible and get the full condensing savings. The radiant floors will be running more than the radiant rads which are upstairs in a loft type set up and will be getting some of their heat from the downstairs. Is the Vision 2 control going to have multiple set point capabilitys. That would be way cool. WW

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Wayco Wayne_2

I am

designing a system that will have a Munchkin at the heart of it. We will have an indirect, a panel rad loop, and 3 radiant floor loops, (wt constat circ, all same temp). I want to make sure the munchkin is seeing the lowest water temps whenever possible. The vision 1 control only can control domestic watr and one heating temp reset circuit. Unforunately I want 2 different temp circuit heating loops. Any suggestions??? WW

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Mike Kraft_2

A simple solution

use a 3 way(manual) and mix down the second temperature.

cheese

Mark Eatherton1

Not sure but...

I think waht you need is the Vision 3 cascade control. Talk to the boyz at HTP and see when it will be available. Sounds like just the ticket for your application.

ME

Alan(CaliforniaRadiant)Forbes

Vision Controls

Vision I system - outdoor reset/indirect domestic priority/2 temperature system.

Vision II system - Multiple temperature zoning system w/ outdoor reset.

Vision III system - Cascade control can control the operation of up to 8 boilers off 1 panel.

Make it easy on yourself: go full-temp. on the radiators and let the Vision I controller reset the radiant............. although I don't know how to by-pass the reset for the radiators. You'd have to treat it as a second indirect.


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Wayco Wayne_2

Thanks guys

Alan, I was thinking along the same lines. Put zone valves on the secondary circuit for the indirect and divide between the high temp and the indirect. Since the Rads shouldn't be on that often I could even just inject heat from the zone valve into a constant circ radiator loop, then add an outdoor re-set later if I think I need to. You guys are a big help when my thinking is foggy. Thanks a lot. WW

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Wayco Wayne_2

Also thinking

I could size the rads for 140 @ 10 degrees and probaly do fine for condensing since it is seldom 10 degrees for very long in this area. Then I could just step down for the radiant floor. Is Vision 2 availible yet? WW

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jwade55_3

Got one operating like this

Vision 1 will let you accept either a aquastat open/closed signal from the indirect or the thermistor. Use an aquastat for the indirect, in parallel with a signal from the panel rad zone. Create a secondary high temp loop with zone pump for indirect and injection pump for panel rad. The only thing to watch is the time function, Min on/off time. I'm not sure how much this is actually adding to efficiency, but kinda got in a jam, panels were added as afterthought, boiler was piped and running.

J

Guy_5

split

Hi Wayne,
How about splitting the high temp. loop? Vision 1 at its most basic level is one high temp zone and one whatever temp zone. You might use a 2 zone priority relay, with one (priority) zone for the hot water maker and the other for the panel rads. Use One circulator on the split loop with zone valves for each load. The only downfall is that those loops will be prioritized within the 925 control.
The radiant loop could then be set at the lower temperature through the 925 control.
We are currently working on developing drawings for designs like this.