Three port valve question

[mrmiles]

Hi,

I have a three-zone system, one HW, one radiator CH, and one zone underfloor heating (ground floor). The HW and CH are controlled by a 3-way valve, the UFH by a separate 2-way valve. It's all working fine, though was only installed a week or two ago.

My question is, what position is the 3-way valve in when there is no CH or HW demand from the controller?

I've just started running the UFH with the HW and CH turned off at the controller, and I _think_ (from feeling some of the pipes) that some of the radiators are coming on even though they're supposed to be off. I'm not certain though as it takes some time to cool down... So really trying to work out if this is a plumbing problem (3-way valve) or an electrical problem (wiring centre) before I phone the appropriate person!

Hope that all makes sense! Thanks in advance for any help you can give me!

 

[seco services]

the 3 port could be in any position depending on what was last called for hw or heating.

 

[picasso]

is there a name and/or numbers on the 3 port valve ?

 

[kevindgas]

should have been installed with 3 zone valves not a mid position valve as a mid position valve is always open on at least one side.
get the installer back to retify his mistake!!

 

[APHSLTD]

the 3 port could be in any position depending on what was last called for hw or heating.

A three port valve will always default to HW position. However if the hot water is satisfied it will go to heating position.

 

[matt1e]

the 3 port could be in any position depending on what was last called for hw or heating.

A three port valve will always default to HW position.

Only if all power is removed

as kev has said it should have been 3 two ports for reasons he has already given

 

[APHSLTD]

Hi,



My question is, what position is the 3-way valve in when there is no CH or HW demand from the controller?

That would be all power removed then With the exception of hot water off from the clock of course

 

[seco services]

Hi,



My question is, what position is the 3-way valve in when there is no CH or HW demand from the controller?

That would be all power removed then With the exception of hot water off from the clock of course

so then it don't always fall to the default position then. does it ?

 

[kevplumb]

depends if its mo mc (w plan)

or spring return

surely

 

[APHSLTD]

Hi,



My question is, what position is the 3-way valve in when there is no CH or HW demand from the controller?

That would be all power removed then With the exception of hot water off from the clock of course

so then it don't always fall to the default position then. does it ?

No, it doesn't but it also has sod all to do with what was last called for does it?

 

[seco services]

go read how a y plan 3 port valve works.
the grey wire will hold the valve in last position of what ever was last calling for heat.

don't come back till you have read how they work.

 

[doitall]

go read how a y plan 3 port valve works.
the grey wire will hold the valve in last position of what ever was last calling for heat.

don't come back till you have read how they work.

Tell him Seco

 

[seco services]

go read how a y plan 3 port valve works.
the grey wire will hold the valve in last position of what ever was last calling for heat.

don't come back till you have read how they work.

Tell him Seco

bl**dy hard work sometimes

 

[APHSLTD]

go read how a y plan 3 port valve works.
the grey wire will hold the valve in last position of what ever was last calling for heat.

don't come back till you have read how they work.

Tell him Seco

Close but no cigar

 

[doitall]

go read how a y plan 3 port valve works.
the grey wire will hold the valve in last position of what ever was last calling for heat.

don't come back till you have read how they work.

Tell him Seco

Close but no cigar

If the cylinder stat is satisfied and the heating shuts off, leaving 240vac on the grey wire the MV will stay in the last position.