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difference between 3 port & mid position valves


 
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angelf

from United Kingdom

Joined: 07 Jun 2006
Posts: 235
Location: Kent,
United Kingdom

PostPosted: Mon Apr 26, 2010 12:07 pm Reply with quote

what is the difference between a 3 port valve & a mid position motorised valve?

Can one be replaced with the other?

If not why not?
Cheers
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Mr Smyth

from United Kingdom

Joined: 26 Nov 2005
Posts: 275
Location: Surrey,
United Kingdom
Thanked: 25 times

PostPosted: Mon Apr 26, 2010 12:24 pm Reply with quote

A 3-Port valve lets you select HW or Htg whereas a mid position valve lets you select HW, Htg or both HW and Htg.

Yes you can change a 3-Port to a mid position valve but there will be some simple changes to your wiring.

Hope this helps
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45yearsagasman

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Joined: 14 Mar 2010
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Location: Norfolk,
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PostPosted: Mon Apr 26, 2010 12:32 pm Reply with quote

Both of these have "3 Ports" ie inlet port and hw and heating outlet ports.
A mid position valve is able to allow water to flow to HW only,CH only and to both at once by holding the valve in the Mid Position,These valves normally have 5 wires. A 3 port diverter normally has 3 wires and can only supply CH on its own or HW on its own but not both together.These valves as such are interchangeable with some wiring alterations.
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angelf

from United Kingdom

Joined: 07 Jun 2006
Posts: 235
Location: Kent,
United Kingdom

PostPosted: Mon Apr 26, 2010 7:31 pm Reply with quote

thanks Mr Smyth & 45 year gas man
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