4-way mix vlv fixed stop points??? (PAH)

Dave Yates (PAH)

Looooooooooonnnnnnnnnnnnnngggggggggggg run of commercial BB. Looking to reverse flow by timed cycles to cure chilled classrooms. Having trouble finding a set point controller to stop the 4-way mixing vlv paddle where I want it to stop - consistantly and reliably.

Anyone know of a 4-way & control package designed to perform like this?

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Mark Eatherton1

If you need to change the temp...

the mixing valve has to be between the heat source and the reversing valve. "Nother great place for a 4 way, VSI, FI or whatever pickles your tink. Speaking of tink, how's your mom doing?

After having re-read your post, when we do the 4 way reversing thing, the Paxon motors have limit switches on them to keep them in check. As a directional flow reversing valve, they're either one way or the other, never in between. Now your 4 way MIXING motor is an animal of the same color operated differently, but you knew that!

ME

Dave Yates (PAH)

paxon?

She's keeping a low profile after yesterday's festivities. Although we all pitched in so she didn't have to lift a finger, having that many visitors wears out even the hardiest of folks. She's an inspiration to us all, having suffered through extremely difficult back problems twice - 35 years ago and now again. She's bulstered by your (the collective you) support and kind thoughts.

Gave em some DVD's yesterday & Dad was the first to realise what they were. "Thanks, but we can't watch these - we don't have a DVD player". Quitcher belly aching, I replied. The look on their faces as we lent no sympathy about their lack of viewing capacity was priceless! The DVD player followed next(G).

I'm not familiar with Paxon motors or controls. This is for just one zone in a large complex and it serves a long row of classrooms. The thermostat is at one end and the classrooms at the other end are c-c-c-c-cold. Progressively cooler as the fluid travels and those Btu soldiers get off at each station. No cutting fins off of the upstream BB either as its 2" steel. A 4-way will let me reverse the flow in the circuit without affecting the boiler room piping/pumping arrangement. A timer could be utilized to energize the motor, but no guarantees for stopping points lead me to troubled waters (in my minds eye). No mixing of temps in this old system - not yet anyway. We talked about lots of innovations and laid the foundation for new thinking with respect to things like condensing boilers and adaptive controls for remote monitoring.

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hr

Here's one I built

To use on a 1500 foot radiant loop, as a flow reverser. A basic Theromix 4 port with a shutter motor from Graingers.

Seems to work well in my shop testing. the motor powers open, like a zone valve, and spring closes.

hot rod

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Mark Eatherton1

I missed a T...

it's Paxton. A division of Danfoss.

ME

Dave Yates (PAH)

Ahhhhhhhhhhhhh

Thanks guys - I asked the folks at Danfoss this question a while back & they're checking to see how the Germans do it.

The problem, as we all saw it, is to effectively get the 4-way to stop at 45, 135, 225 & 315 degrees on each cycle or to travel 90 degrees from an initial set point each time it cycles.

Is that how yours works HR? If so, can you list the Grainger part #'s?

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hr

Mine

was intended to switch directions without stopping along the way. It makes a full 1/4 revolution form one extreme to the other. Operates almost identically to a Honeywell or Erie motorized zone valve, as far as speed.

hot rod

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Mark Eatherton1

Correction....

the valve is a Paxton, the operator is made by ESBE wich is a wholy owned subsidiary of Dannfoss.

See what happens when you try to think whilst on vacation...

ME

Mr. Bill

Esbe

Mark, don't let the folks at Esbe hear that.

Esbe is an independant company who we have had the pleasure of working with for many, many years. We are their North American Distributor but we don't owm them.

Mark Eatherton1

SOrry...

I guess I misunderstood what I was told by the gentleman from Esbe. Anyway, they have an excellent product that we have used many times without failure.

ME

Dave Yates (PAH)

What if........

we add another sensor to the "return" and a DPDT NC switch that is looking at the "supply" side sensor until energized - which will then cause the controller to "see" the second sensor for its target temp. A simple timer could be incorporated to energize the switch coil. That way, no fixed points need to be programmed into the 4-way valve & it will drive towards the programmed temp.

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Mad Dog

Give Mom, Mad Dog's regards

MD

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Ted_5

Viessmann has

a 4-way valve and motor. It is a step motor, so it will stop in place when power is cut off. 120V needed. Use an off delay relay to stop where you want it to.

Ted