When we had our kitchen refitted some years ago a Myson kick-space fan
heater was installed.

Recently I planned to balance the radiators in the house and I
discovered that the Myson doesn't have any sort of valve on either
side.

Is this normal ? It sounds wrong to me.

On the face of it, it's just a short circuit across the rest of the
heating system.

What's the correct procedure ?

wrote:

When we had our kitchen refitted some years ago a Myson kick-space fan
heater was installed.

Recently I planned to balance the radiators in the house and I
discovered that the Myson doesn't have any sort of valve on either
side.

Is this normal ? It sounds wrong to me.

On the face of it, it's just a short circuit across the rest of the
heating system.

What's the correct procedure ?


I installed ball valves on the pipework going to my (smiths) fan heaters.

wrote:
When we had our kitchen refitted some years ago a Myson kick-space
fan
heater was installed.

Recently I planned to balance the radiators in the house and I
discovered that the Myson doesn't have any sort of valve on either
side.

Is this normal ? It sounds wrong to me.

On the face of it, it's just a short circuit across the rest of the
heating system.

What's the correct procedure ?

Heat output from those is controlled by the onboard electric control
that runs the fan. All radiators are almost short circuits So there
shouldnt be any need to do anything, just make sure your most wanted
heat source has its valve fully open, just as the myson has.

NT

wrote:

wrote:

When we had our kitchen refitted some years ago a Myson kick-space

fan

heater was installed.

Recently I planned to balance the radiators in the house and I
discovered that the Myson doesn't have any sort of valve on either
side.

Is this normal ? It sounds wrong to me.

On the face of it, it's just a short circuit across the rest of the
heating system.

What's the correct procedure ?


Heat output from those is controlled by the onboard electric control
that runs the fan. All radiators are almost short circuits So there
shouldnt be any need to do anything, just make sure your most wanted
heat source has its valve fully open, just as the myson has.


This did not work for me. Distant fan ghetaers were totally starved.

Unlike TRV's which control water flow, these ran blown things simply let
hot warter circulate irrespective of whether heat is called for - the
fan is what is controlled.

The ball valves were definitely needed to get remote units up to temp.


NT

"The ball valves were definitely needed to get remote units up to temp.
"

That's exactly what I imagined.

So what sort of ball valves did you use ?

Do you mean those cheap in-line jobbies that are used to shut off items
for maintenance ?

Or do you mean something more specialised ?

Recently I planned to balance the radiators in the house and I
discovered that the Myson doesn't have any sort of valve on either
side.

Yes, when it was installed, balancing valves should also have been put in.
However, some models may have isolating valves on the input, which might be
useful for balancing.

Fan convectors work best on their own zone. Turning off the fan is not
enough to stop them eating the hot water, so they should have an external
zone valve.

Christian.

On 31 Jan 2005 06:02:28 -0800, in uk.d-i-y wrote:

wrote:
When we had our kitchen refitted some years ago a Myson kick-space
fan
heater was installed.

Recently I planned to balance the radiators in the house and I
discovered that the Myson doesn't have any sort of valve on either
side.

Is this normal ? It sounds wrong to me.

On the face of it, it's just a short circuit across the rest of the
heating system.

What's the correct procedure ?

Heat output from those is controlled by the onboard electric control
that runs the fan. All radiators are almost short circuits So there
shouldnt be any need to do anything, just make sure your most wanted
heat source has its valve fully open, just as the myson has.

Indeed the heat output is controlled by a thermostat that turns the fan
on and off. That, however, has nothing to do with balancing which is all
to do with getting a balanced water flow to all radiators. If any
radiator, Myson kick-spaces included, has no water valves at all it will
indeed be a short circuit which will rob water pressure from distant
radiators.

In short the OP is right - it is wrong and can be rectified by the
addition of an adjustable restricting valve i.e. a lock-shield valve
(LSV) on one side. Putting a control valve on the opposite side while
your at it will enable isolation of the Myson should it need to be
removed in the future. Conventional LSVs are screwed into the radiator
tails themselves, but a ball* valve anywhere in the pipework feeding (or
returning from) the Myson will serve equally well.

Having done that, balance the system according to the FAQ.

From the way this kick-space rad has been installed there is a very good
chance that the rest of the system was never balanced either. You might
be surprised at the improvement in evenness of heating once you have it
all balanced.

* See my next post for clarification

Phil
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On 31 Jan 2005 11:47:52 -0800, in uk.d-i-y wrote:

"The ball valves were definitely needed to get remote units up to temp.
"

That's exactly what I imagined.

So what sort of ball valves did you use ?

Do you mean those cheap in-line jobbies that are used to shut off items
for maintenance ?

Or do you mean something more specialised ?

Those "cheap in-line jobbies" are meant for high pressure cold feeds and
have quite a narrow aperture. Consequently they might restrict the flow
more than is wanted for balancing, resulting in inadequate flow to that
radiator. The alternative is a full bore design.

Phil
The uk.d-i-y FAQ is at http://www.diyfaq.org.uk/
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