R
RichardBothwell
How's it goin Glasagas, hope you had a good Christmas & Hogmanay. Hows your mother-in-laws health, improving I hope??
Y plan system locking on.
- Thread starter Agile
- Start date
evening Mr Bothwell
M I A stable but no progression
as always many thanx for the kind words
and give `em hell!!!!
M I A stable but no progression
as always many thanx for the kind words
and give `em hell!!!!
Now we have wished Dick a happy new year we can get back to my friends problem which has now become mine!
I have not been into her loft yet and hope that I dont need to.
Even if there was a frost stat anywhere I dont see that dissing the orange would make it cease working.
Its a standard genuine Honeywell mid position.
Its non working boilers that I am expected to get working on one visit. Not odd and intermittent faults on friends systems.
Not only was she there to talk to me but someone else I know too was there fixing draught proofing to her front door. I even refused her two offers of coffee as I had other jobs to go and do.
Its in the open forum because there are a couple of people who are not gas registered who might just come up with a suggestion.
Part of my problem is that in the lab one can just disconnect bits and try that out. She is not really the kind of lady that would let me interfere with it overnight and I would get into trouble if I stayed there !
Tony
I have not been into her loft yet and hope that I dont need to.
Even if there was a frost stat anywhere I dont see that dissing the orange would make it cease working.
Its a standard genuine Honeywell mid position.
Its non working boilers that I am expected to get working on one visit. Not odd and intermittent faults on friends systems.
Not only was she there to talk to me but someone else I know too was there fixing draught proofing to her front door. I even refused her two offers of coffee as I had other jobs to go and do.
Its in the open forum because there are a couple of people who are not gas registered who might just come up with a suggestion.
Part of my problem is that in the lab one can just disconnect bits and try that out. She is not really the kind of lady that would let me interfere with it overnight and I would get into trouble if I stayed there !
Tony
in answer to your question Mr Glazier, what do you think the problem is?
The operating cam correctly activated and deactivated the microswitches at the appropriate positions.
Both switches clicked and sounded OK. I did not have time to electrically test them. However as dissing the orange stopped the problem without the valve moving so I think the valve may not be the problem.
Tony
Both switches clicked and sounded OK. I did not have time to electrically test them. However as dissing the orange stopped the problem without the valve moving so I think the valve may not be the problem.
Tony
Is it not with worcesters that a low voltage back feed from 3 port valves cause the boiler to stay on, I was lead to beleive that fitting a capacitor (or some such thing) will stop it - don't know where you would fit it, either.
I still think its a failed resistor, power passing across to orange
http://www.diyfaq.org.uk/plumbing/controls/midpositionvalve.htm
http://www.diyfaq.org.uk/plumbing/controls/midpositionvalve.htm
N
namsag
Agile i think what your really trying to say is D Hailsham please help me 
Tony,
Y plan electrical faults are confusing to diagnose as the presence of a voltage does not indicate the source or path it is taking. Only when you start disconnecting wires can you track which switches are open or closed etc, but then of course the operation of the circuit is altered! The temorary insertion of a 240v switch in series with the MV / stat / programmer wires (a lightswitch will do) can be a quick and helpful method to isolate the fault.
Y plan electrical faults are confusing to diagnose as the presence of a voltage does not indicate the source or path it is taking. Only when you start disconnecting wires can you track which switches are open or closed etc, but then of course the operation of the circuit is altered! The temorary insertion of a 240v switch in series with the MV / stat / programmer wires (a lightswitch will do) can be a quick and helpful method to isolate the fault.
I dont think a failed resistor can have occured as that would not create this fault condition UNLESS the 270K was open circuit AND the motor was not returning under spring pressure.
However, if its a know fact that the call for heat connection on the Worcester is over sensitive then a simple resistor of perhaps 47K between orange and neutral would cure any problem like that. However at that resistance it would dissapate about 1w and so practically it would need to be say 270K to reduce the dissapation to below 1/4W so a standard power component could be used. I will aim to try that shortly.
Having said that, I still don't see how that could occur under normal operating conditions!
Still those are two helpful suggestions and I will go and check the two resistors in the valve head ( although the 13k is obviously OK as the valve is locking ).
Thanks for these ideas.
Tony
Edited to correct suggested resistor values to achieve more acceptable power dissipation.
However, if its a know fact that the call for heat connection on the Worcester is over sensitive then a simple resistor of perhaps 47K between orange and neutral would cure any problem like that. However at that resistance it would dissapate about 1w and so practically it would need to be say 270K to reduce the dissapation to below 1/4W so a standard power component could be used. I will aim to try that shortly.
Having said that, I still don't see how that could occur under normal operating conditions!
Still those are two helpful suggestions and I will go and check the two resistors in the valve head ( although the 13k is obviously OK as the valve is locking ).
Thanks for these ideas.
Tony
Edited to correct suggested resistor values to achieve more acceptable power dissipation.
The mid position valve has two microswitches. Both have to be switched over for CH to work. See these diagrams
View media item 17313
Came across this which might help. The post by Tony Jones May 2009
http://www.gas-news.co.uk/cgi-bin/discus/show.cgi?tpc=18&post=18927
http://www.gas-news.co.uk/cgi-bin/discus/show.cgi?tpc=18&post=18927
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