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Topic Title: two port valves
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Created On: 19 January 2013 12:01 PM
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 19 January 2013 12:01 PM
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SKElectrical

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okay two port valves have 5 stinking wires coming out of them.
Concentrating on the grey and orange..
..why do they make it with a grey (perm live), when they could just use the brown as the live feed on the microswitch.
 19 January 2013 12:19 PM
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colinhaggett

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Because if you had more than one it would latch on and not turn off!
 19 January 2013 12:30 PM
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OldSparky

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 19 January 2013 03:18 PM
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SKElectrical

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Because if you had more than one it would latch on and not turn off!


Can you explain please, I don't follow you.
What I'm asking is why doesn't the (stat controlled) brown act as the supply to the micro-switch?
 19 January 2013 03:35 PM
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slittle

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Because if you have the oranges from two or more connected together to feed a boiler when one thermostat stops calling for heat, before the spring can release the valve, it will stay open fed from the other valve's brown supply through it's own contacts.

(edit: did do a drawing with characters but it didn't post properly)

Does that help ??

(About time we could upload diagrams, being as it's a technical forum)

Stu
 19 January 2013 03:38 PM
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colinhaggett

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Originally posted by: SKElectrical



Because if you had more than one it would latch on and not turn off!




Can you explain please, I don't follow you.

What I'm asking is why doesn't the (stat controlled) brown act as the supply to the micro-switch?


The brown motor wire would pick up a live back through the micro switch form any other valve on the heating system. Would act like a latch on a relay.

 19 January 2013 05:04 PM
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SKElectrical

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Originally posted by: slittle
Because if you have the oranges from two or more connected together to feed a boiler when one thermostat stops calling for heat, before the spring can release the valve, it will stay open fed from the other valve's brown supply through it's own contacts.


Hi Stu are you trying to say what colin said:

Originally posted by: colinhaggett

The brown motor wire would pick up a live back through the micro switch form any other valve on the heating system. Would act like a latch on a relay.
 19 January 2013 05:05 PM
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SKElectrical

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Originally posted by: slittle

(About time we could upload diagrams, being as it's a technical forum)

Stu



Agreed. Lets start a topic.
 19 January 2013 06:17 PM
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Martynduerden

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You could always link your grey to the brown, assuming you only have one valve.....

Its all about options, you really would be complaining if you only had 4 wires!

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 19 January 2013 07:29 PM
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slittle

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Originally posted by: SKElectrical

Originally posted by: slittle

Because if you have the oranges from two or more connected together to feed a boiler when one thermostat stops calling for heat, before the spring can release the valve, it will stay open fed from the other valve's brown supply through it's own contacts.





Hi Stu are you trying to say what colin said:



Originally posted by: colinhaggett



The brown motor wire would pick up a live back through the micro switch form any other valve on the heating system. Would act like a latch on a relay.



Yes
 19 January 2013 10:08 PM
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SKElectrical

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okay well you've cleared something up there that's bugged me for ages!! I suppose I have only ever thought of it in the context of one valve...


You could always link your grey to the brown, assuming you only have one valve.....

Its all about options



Thanks guys.

Just took the kids to Frankie & Benny's - £220. I thank you!
 20 January 2013 11:49 AM
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ebee

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I remember some years ago on a system I was working on for some heating bods the valves were only four wire (the L for the feed for the "Turned" microswitch was derived from the L of the valve.

Ended up putting them a relay for each valve for zoning (any valve opened fired up the pump

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Ebee (M I S P N)

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