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Yep they do, most have a switched 240v output
ready
to connect straight to the pump.
As James says some have a motor and spring
return
the other way is with a rotating shaft with a hole in it, this is turned
through
90 deg to open or close. To achieve this two switch wires are used one to
open
the other to close, this is one reason why programmers and room stats have
change over contacts, to closed the valve when the heating turns
off.
Alancc
----- Original Message -----
Sent: Friday, December 28, 2001 2:24
PM
Subject: RE: [ukha_d] Homevision
control
of Central Heating
No
... I really did not know that.
Phil
Not sure if that was a sarcastic
comment?
Alancc
----- Original Message -----
Sent: Friday, December 28, 2001 1:29
PM
Subject: RE: [ukha_d] Homevision
control of Central Heating
Well I never knew that...
Phil
Most motorised valves have an inbuilt
switch which is used to control the pump, if these are connected
together then the pump will only run when a valve is open.
Alancc
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