Reversing flow valve?

Big Ed

What is done to melt a 200' drive way ?? Don't they in Europe have snow melt systems in streets ? Just thinking ??

Unknown

Help us bail out a bad snowmelt

Hey all,

Well, got a call from someone who wants help getting a snowmelt to work.

500' 3/4" loops laid serpentine already in concrete. Yahoo! we're going to piggyback a couple of 0013s to run a 35 degree temperature drop across the loops. However, I am thinking we will need a flow reversing valve to heat both ends of the loops adequately.

Problem is, I've never seen one and I have no idea where to find them.

Any suggestions?

Plumdog_2

me too

I got a guy with two 1000 foot loops of 1/2" already poured. Forgot to look at the directions.

singh

4 way

I am under the impression that you only need a standard 4 way motorized mixing valve , and a timer. Timer available at Grainger?
I have not run into this problem yet, but heard stories at the local supply house.

An illustration from Siggy.

http://www.pmmag.com/CDA/Archives/625c61cba20d7010VgnVCM100000f932a8c0____

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hr

Here is a prototype Paxton

that I have been messing with. A basic 4 way with a Honeywell operator. About 45 seconds to wind open 15 to spring wind back.

I did some data logging with it this past heating season. Siggy will crunch the numbers and write it up at some point.

hot rod

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Big Ed

Whats the Problem

Reading along with this thread . Is the problem with the job ,that the loops are too long for design and your trying to send hotter supply water back and fourth on each side of the loop to make it work ?

Signed
Curious George

[Deleted User]

Over heard conversation on troubled job site...

from the mouth of a Weakend Warrior "Why don't they put instructions on the boxes to keep people like me from installing 1,000 foot long coils???"

The look on my partners face was...PRICELESS!!

ME

Unknown

I have more calcs to do, and if this were counterflow I would be inclined to think a 35 degree drop would be ok, but these loops are serpentine and I'm thinking the water won't be hot enough at the end of the loops to melt adequately at any GPM we can conceivably push

[Deleted User]

I can and have melted 600' driveways...

Put the supply manifold at the beginning, and a return manifold at the end of the driveway, then put a 4 way reversing valve on it. Worked like a CHAMP.

HR will be sharing some data through Siggy soon showing the results. In my personal observations, when the valve switches, you can hear the boiler cycling back (mo-co) as the warmer fluid is retreived, and then you hear it picking back up again as the cooler fluid hits the boiler. Quite the process.

One day next year, I am going to borrow my brothers digital recording/programmable camera and set it up to observe this system and see what it looks like during a snow storm time lapse style. Hopefully, we're done with snow storms this year, although they DID get hit pretty hard down south last week...

ME

Weezbo

bump