Thumping Manifold Value

[byronsmith]

Good moaning!

Let me start my listing what I have:

Worcester Bosch 30 Cdi
Wavin Thermoboard

The systems are fairly new about 3 months old, and we've only just got the UFH working downstairs. Upstairs we have rads . The problem is every now and again, intermittently, the blue value on the Wavin Thermoboard starts thumping.

You can see the blue value I'm referring to on the very left of this picture, below the pump. (http://www.esi.info/Images/profilePics/Wavin_Thermoboard_Composite_manifold_for_underfloor_heating_1.jpg)

I thought it was air in the system or pressure so I bled the rad's and then re-pressurized the boiler to 1.5bar. Although on the UFH manifold the pressure is about 2bar.

Unfortunately this hasn't resolve the issue, any ideas what could be causing this thumping? Should I add more pressure to the system?

I can make the thumping stop whilst it's occuring if I change the value of the value to something else but after awhile it'll start thumping again at that set value. It's as if it starts when it reaches the temperature that the value is set at.

Perhaps a faulty value? What's a safe way of checking this value that it's working?

Here's a vid of the issue.

http://www.youtube.com/watch?v=y4spyRmaYSQ&feature=player_profilepage

Thanks a ton.

 

[Morris40]

does the TRV have an arrow on the body somewhere ?, you probably have a single direction TRV fitted to the return on the Rad,

 

[byronsmith]

Hi, thanks for the reply.

The value in question is fitted to the UFH manifold, no rads involved in the above scenario Unless I'm not understanding you?

Regards
Byron

 

[Morris40]

Oooops sorry, didn't see vid have now

 

[byronsmith]

Just in case anyone does read this, I've removed the entire value now and of course the noise has stopped but I'm wondering what adverse affect that will have.

The manifold has a flow watch protection thermostat which I've set to 60c and the value a.k.a flow water temperature actuator is now removed.

What are the differences between the two and why would I need both?

 

[byronsmith]

I feel like I'm talking to myself but oh well, if it helps solve this problem I'll talk to myself all day long.

I decided to put back the Thermostat Actuator after RTFM. I'd rather not break anything.

But before I did I wanted to see if the thumping was due to the Thermostat Actuator head of the value itself, and this is what I came up with.

http://www.youtube.com/watch?v=y77GUtkfQWs

I don't know what would cause this? Pressure? Faulty Value?

Help.

 

[Norcon]

I think the circulator is on speed setting three. You could try lowering it.
What are the flow indicators on the manifold currently reading?

 

[byronsmith]

Pump: Speed 3 (I've tried all 3 speeds whilst the noise is happening, no luck)
Water Flow Thermostat: 60
Water Watch Thermostat: 70 (Lowering this seems to make it less noisy but still there, and according to the manual this should be 10c more then the water flow. and for my timber floors 60c is the maximum recommended
value)

I've tried increasing/decreasing all of these whilst the noise thumps away nothing seems to stop it.

Still don't know what each of these things are and what their purpose is. Why two temp guages, one for a value and the other for a pump? very odd.

 

[Norcon]

Water Flow Thermostat: 60
Water Watch Thermostat: 70

This doesn't make sense.

You have a temperature dial on the top manifold which is the flow.
This should be reading no more than about 40c. The return dial indicator should deviate between 5- 10c lower.

 

[byronsmith]

Looking at the very left of the image below:

http://www.esi.info/Images/profileP...mposite_manifold_for_underfloor_heating_1.jpg

I have a blue thermostat actuator value, this has values of 1 to 6 and in accordance to the manual the recommended value for timber flooring is 6 which equates to 60c. Also on the left, I then have a white temperature setting at the top of the manifold. This is set to 70c, again, in accordance to the manual which states that this should be 10c more than the blue thermostat actuator.

 

[bengasman]

Good moaning!

Let me start my listing what I have:

Worcester Bosch 30 Cdi
Wavin Thermoboard

The systems are fairly new about 3 months old...

Simple, get the installer back; any diy may void your warrantee.

 

[D_Hailsham]

I have a blue thermostat actuator value, this has values of 1 to 6 and in accordance to the manual the recommended value for timber flooring is 6 which equates to 60c.

Read the manual again! It says:

For Timber Floors the maximum recommended flow temperature is 60°C.

They also say:

Heated floor surfaces should not exceed 9°C above the design room temperature.

Underfloor heating systems are normally run with flow temperatures of 50C or under.

What temperature differential are you getting across the boiler flow and return? The WB30CDi is designed for a 20C differential. If you are getting a smaller differential you need to set the pump to a lower number.

 

[Norcon]

Where is the sensor phial on the capilliary line connected?

 

[byronsmith]

Guys,

Many, many thanks for your help and advice especially regarding the differential between flow and return heat. I will set these accordingly.

I phoned the manufacturer today and before I had finished saying the word thumping the engineer said 'bypass'. Because my area water pressure is high (a good thing in my eyes) its not so good for manifold valve which apparently requires a bypass. The plumber agreed this is the case and is back tomorrow to fit one!! Why the effing hell it took me, a paying customer , to find out this information is beyond me. But anyway, it's related to water pressure but I'll wait for tomorrows installation before I form an opinion.

Does that make sense to you guys? A bypass on the manifold certainly sounds about right from what I've been reading but your opinions matter so it'll be nice to hear them.

Thanks!

 

[D_Hailsham]

I phoned the manufacturer today and before I had finished saying the word thumping the engineer said 'bypass'. Because my area water pressure is high (a good thing in my eyes) its not so good for manifold valve which apparently requires a bypass.

Doesn't make sense at all. The mains water pressure is only relevant for the water coming out of the taps.

If you have a system boiler, the pressure is regulated by the filling valves and will be read on the pressure gauge of the boiler. If you have an open vent boiler, the static pressure is determined by the height of the F&E tank above the pump.

There may be a need for a bypass when the actuators are closed on the various sections of underfloor heating - just as when motorized valves are closed.