boiler protection options

Ted_9

I think Taco has made some great economical controls.

I don't know what your btu requirments are, but the RMB-1 and the I Series mixing valve are something you can look at.

http://www.taco-hvac.com/

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CC.Rob

boiler protection options

For my next endeavor, I want to figure out the most economical way to achieve boiler protection when I go to outdoor reset with DHW priority. Conventional gas-fired boiler. I've run a bunch of ODT, heat loss, water temp and BTU output scenarios using observations and Slantfin's HE2 and it looks like I can heat my house at ~140-160F for all but a few days a year. Problem is, I don't know what's ok, piping-wise. Something between a simple bypass with a ball valve and full-on primary-secondary piping, but what? In this situation, I'd like to go fairly simple if possible.

The options seem many. Input appreciated. Thanks.

Brad White_9

Simplest method

in my estimation for boiler protection only (not P/S reset control) is the return water protection system offered by Burnham. I have specified this on their commercial boilers; not sure if it is available to the residential market but the principle is the same; you could mimic it.

Essentially it does require a boiler circulator separate from the radiation circulator. A 3-way valve modulates to maintain a minimum HWR temperature to the boiler while diverting the remainder to the system. Perhaps Glenn Stanton could elaborate.

The bypass valve does not seem responsive to temperature. Like a stopped watch it will be right twice a day

Left to itself it will not save energy hence defeat or work against the reset benefits you seek.

I am sure that there are other methods, and the ones I can come up with get you into a 4-way mixing valve, which is a really sweet way to go both for control and with proper priority sensors, boiler protection.

bob elmore

protection

I have used the taco i series 3 way mixing valves with
great success. you have to order extra sensor for
boiler protection.

Ted_9

I have two and they both have one outdoor sensor and two strap on sensors.

they are the 3 wat outdoor reset models.

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Boilerpro_3

My simple

Is to pipe P/s and install a Danfoss Esbe Thermix Valve on the boiler return. This setup enusre full flow through the sytem during bypass and requires no wiring.... The valve is self actuating like TRV's.

Boilerpro

Ted_9

Couldnt you also use the two way version for boiler protection?

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Jed_2

Pumped by-pass

If it is a pumped by-pass, the Taco 00-VS series of circulators is the way to go. Go with the limiting setpoint, direct acting set up, and header/bypass pipe sizing is more flexible. SP temp range 75-165°.

Jed

Mike T., Swampeast MO

I'll have to look, but surely there's a simple, inexpensive reset control that stops the reset curve below a threshold of your choosing. e.g. regardless of outdoor temp or curve, 130 or whatever is the minimum supply temperature.

Dave_12

Danfoss / Esbe

I agree with Boilerpro, the small little thermostatic valves used in a primary - secondary seem to work great. I can post a picture and data sheet tomorrow at work if you would like.

Jed_2

typically used

as a variable flow injection valve. Possibly and probably. Piping and circulator location come into play.

Jed

Pat_11

boiler protection

Attached is the link to the Taco 00-VS info that Jed refers to.

http://www.taco-hvac.com/uploads/FileLibrary/TD02.pdf

I've used it and it's easy to work with.
Pat

[Deleted User]

K.I.S.S.

http://www.danfossheating.com/products/pdf/TV_ thermic valve.pdf

ME

CC.Rob

Great. Thanks all for all the things to think about. I like the 3-way KISS idea. Probably a summer project.

Dave_12

Dave_12

Here is our generic drawing for the Danfoss valve and our cut sheet for it. When we first started selling them the Danfoss/ESBE lit wasn't worth the paper its printed on.

hr

Simplest yet

Would be a 140 aquastat in the boiler. it's the old Viessmann trick that they use on their entry level ast iron boilers. When the temperature at the return falls below 140 it turns off the boiler pump.

Works best on a high mass cast iron boiler.

Also most OD reset controld have a boiler return sensor in the package tekmar, etc. But it does require P/S piping to isolate that circ.

I just installed a Lochinvar Solutions copper tube boiler. It comes with a piped and wired bypass pump. It also has two stage firing standard. An updated version of the old standby copper tube boiler. Reset control is also an option. Not a bad boiler, all in all for high temperature applications.

hot rod

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