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Topic Title: 4 wire zone valve
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Created On: 29 December 2012 12:45 PM
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 29 December 2012 12:45 PM
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SKElectrical

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Having left my testers at a client's house, I couldn't test voltages on this one...
working on a zone valves, some of them had 4 wires coming out of them - will these have been low voltage valves?
 29 December 2012 12:51 PM
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colinhaggett

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As in a normal domestic heating system? Brown, Blue, Grey & Orange?
 29 December 2012 01:38 PM
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SKElectrical

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As in a normal domestic heating system? Brown, Blue, Grey & Orange?


No it was commercial.
Domestically you would have green/yellow as well.
The colours on this valve were: brown, blue, green/yellow, and black.

I'm thinking low voltage (2 for motor & 2 for microswitch and no cpc).
Valve approx. 15yr old
 29 December 2012 01:56 PM
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colinhaggett

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Might be motor open/ motor close?
 29 December 2012 01:56 PM
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slittle

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I'd go for Brown (live and motor drive)
Blue netural
Green/Yellow CPC
Black switched live from the brown


There are a lot of new valves about without a CPC on them too. many of the newer ones are all plastic case and hence four wires


Stu
 29 December 2012 01:59 PM
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colinhaggett

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Originally posted by: SKElectrical



As in a normal domestic heating system? Brown, Blue, Grey & Orange?




No it was commercial.

Domestically you would have green/yellow as well.

The colours on this valve were: brown, blue, green/yellow, and black.



I'm thinking low voltage (2 for motor & 2 for microswitch and no cpc).

Valve approx. 15yr old


Their is at least one make that doesn't have a earth wire!

 29 December 2012 02:13 PM
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briandoherty

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You call it a 'zone valve' but as you're in a commercial environment it may be a three-position control valve with, as colinhaggett suggested, 'motor open / motor close'. In this case, it is likely brown to drive motor one way, black to drive motor the other way, blue for neutral and green/yellow for earth. These valve actuators can position the valve anywhere between the two extremes as required for control.

-------------------------
Regards,

Brian
 29 December 2012 03:34 PM
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slittle

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Opps, missed the bit about commercial in the OP.

Yep, i'll go with open/close in that case


Stu
 29 December 2012 07:40 PM
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chunk522

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Ive had these where the blue and the black are both switched lives if this helps
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