Honeywell 2 Port Valve Heads

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4 Jan 2009
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Are the heads interchangable between the 22mm and 28mm valves ?

I just got worried as the 28mm has the extra white? wire for the NO contact. and started to worry whether they will fit (assuming the white wire is not connected)
 
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Yes, you must put the white wire in an insulated terminal block.

Not leave it sticking out uninsulated in a pile of damp towels like a BG fitter did on a job I saw last year!
 
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if you have a c plan then you will need the white wire.
 

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