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TerenceBooth
 
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Default Central Heating valve problem.

I have a Horstmann timer controlling a fully pumped sytem with a
mid-position valve. If HW and CH are selected and running, then switching CH
off does not cause the valve to move even at the end of the on/off cycle.
The only solution is to disconnect the mains from the system sometime during
the off period when the spring moves the valve to the correct HW-only
position.
Is this a wiring error on my system or a problem with this type of valve?.
Can anyone help with a solution?

Alan Booth



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BillR
 
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Default Central Heating valve problem.

TerenceBooth wrote:
I have a Horstmann timer controlling a fully pumped sytem with a
mid-position valve. If HW and CH are selected and running, then
switching CH off does not cause the valve to move even at the end of
the on/off cycle. The only solution is to disconnect the mains from
the system sometime during the off period when the spring moves the
valve to the correct HW-only position.
Is this a wiring error on my system or a problem with this type of
valve?. Can anyone help with a solution?

Alan Booth


Do your rads actually continue to get hot when CH is satisfied?
I ask this because you usually can't tell what the actuator of the valve is
doing by merely looking at the lever which is for manual override.


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Roger Mills
 
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Default Central Heating valve problem.


"TerenceBooth" wrote in message
...
I have a Horstmann timer controlling a fully pumped sytem with a
mid-position valve. If HW and CH are selected and running, then switching

CH
off does not cause the valve to move even at the end of the on/off cycle.
The only solution is to disconnect the mains from the system sometime

during
the off period when the spring moves the valve to the correct HW-only
position.
Is this a wiring error on my system or a problem with this type of valve?.
Can anyone help with a solution?

Alan Booth




Has it always been like this - or did it previously work in the way you
expected?

If it's always been like this, it could be wired wrongly or - as someone
else has suggested - you may be misenterpreting what it is *actually*
doing.

If its behaviour has changed, it's almost certainly due to a duff
microswitch within the actuator part of the valve. If this is the case, the
simplest solution is to replace the actuator - which you can do without
affecting the water-handling part of the valve. [The alternative is to take
the actuator to bits and replace just the defective parts, Some contributors
to this NG advocate this, but I personally think it's a bit too fiddly!]

Roger


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