motorised valve query
 

Hi All

I've just had a check done by a CH engineer who thinks (not sure) that my
motorised valve is set up wring, in terms of the ports.

At present :
A goes down through the floor
AB connects to the pump (then goes into the loft, where there is a wierd
t-port device which then goes back down through the floorboards) - assumed
to be source from boiler
B goes to the hot water cylinder

So, what he says is the problem is that when the heating is on so too is the
hot water, which cannot switchitself off (thermo stat bypassed in favour of
central heating thermostat).

I must admit to having installed this MV myself but only after going to a
local plumber merchant and asking for like-to-like mv replacement.

Any comments.

Thanks

Matt

In article ,
"MP" writes:
Hi All

I've just had a check done by a CH engineer who thinks (not sure) that my
motorised valve is set up wring, in terms of the ports.

At present :
A goes down through the floor
AB connects to the pump (then goes into the loft, where there is a wierd
t-port device which then goes back down through the floorboards) - assumed
to be source from boiler
B goes to the hot water cylinder

It is more usual to have A (resting position) going to the hot
water cylinder, and B going to the central heating, at least if
you use any of the convensional circuit arrangements.

Of course, you can design a circuit to operate it some other way
(I have A doing downstairs heating, B doing upstairs heating,
and a control box with 4 relays in it).

--
Andrew Gabriel

In an earlier contribution to this discussion,
MP wrote:

Hi All

I've just had a check done by a CH engineer who thinks (not sure)
that my motorised valve is set up wring, in terms of the ports.

At present :
A goes down through the floor
AB connects to the pump (then goes into the loft, where there is a
wierd t-port device which then goes back down through the
floorboards) - assumed to be source from boiler
B goes to the hot water cylinder

So, what he says is the problem is that when the heating is on so too
is the hot water, which cannot switchitself off (thermo stat bypassed
in favour of central heating thermostat).

I must admit to having installed this MV myself but only after going
to a local plumber merchant and asking for like-to-like mv
replacement.

Any comments.

Thanks

Matt

Assuming it's a 3-port mid position valve, it sounds *more or less* ok. AB
is the inlet - so hot water comes into the valve from the boiler via the
pump. A is the CH outlet - so the pipe which goes down through the floor
probably feeds all the radiators. B is the HW outlet, and rightly goes to
the HW cylinder.

I'm not quite sure what you mean about the pipe going into the loft - or
about the "wierd t-port device". Is it a vented system, or is it
unvented/pressurised?

Any chance you could take some digital photos of the valve and of the thing
in the attic, and upload them to the internet somewhere and post the URL
here?

What exactly are the symptoms you are experiencing?
--
Cheers,
Set Square
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In an earlier contribution to this discussion,
Andrew Gabriel wrote:

In article ,
"MP" writes:

It is more usual to have A (resting position) going to the hot
water cylinder, and B going to the central heating, at least if
you use any of the convensional circuit arrangements.

Does it depend on the make of valve? My Danfoss valve *definitely* says
A=Heating and B=Hot Water. That's the way it's connected, and it works as
expected. My valve's unpowered resting position is with B connected to the
input.
--
Cheers,
Set Square
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Please reply to newsgroup. Reply address is invalid.