Too Much Pressure for Actuator?

....jc

CazzBrass Manifold<BR>
PZ656104 Actuators

I'm getting massive vibration coming from the manifold(actuators) during actuator operation(open & close). It's loud enough to wake people up at night. There is a Taco 11 7' from the manifold, feeding from the near boiler piping. There is a valve between the pump and the manifold, and closing the valve about 80%, seems to help. Due to the design(a retrofit), the actuators are on the supply manifold.

Is it possible that there is too much pressure from the pump causing a problem with the operation of the actuators? The people at Watts don't have a solution. Any Ideas?

Thanks,<BR>
....jc

ALH_3

Ideas

Are you using a differential pressure bypass? That's a lot of head when the last actuators are trying to close.

Are the zone valves in the right orientation? That will make really loud noise also.

-Andrew

....jc

Andrew,

There is nothing but 7' of 1-1/4" pipe between the T11 and the manifold, so no bypass is installed there.

I assume that the manifold was assembled at the factory. Zone valves on the bottom, pex supplies on the top.

The T11 was left in it's original spot(prior to the retro).
What do you suggest?

Thanks,

....jc

ALH_3

I would install a bypass in the 1 1/4" line between the pump and the manifold from the supply pipe to the return pipe. That pump has a lot of head, and the bypass will let you set the head at a constant and let the flow vary.

Danfoss AVDO25

-Andrew

Joe Mattiello

Fast closing valve perhap?

Because of the velocity of the water, and the fast closing valve (Assumption) you might be experiencing water hammer.
Taco, Inc.
Joe Mattiello
Technical Service Technician
joemat@taco-hvac.com
401-942-8000 X 484
www.taco-hvac.com

....jc

A bypass valve, huh? Sounds like a lot of work? Would a smaller pump be a better option?

Water hammer? That is sure what it sounds like. Bang, bang, bang.

The main difference between this system, and the prior one, is the fact that the actuators are on the Supply manifold vs the Return manifold. I guess the pressure is a lot higher in this configuration than the prior one?

Thanks,

....jc