pump speed query

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pump speed query

Post  hazetimesfive on Tue Feb 26, 2013 9:51 am

This pulsacoil has a British gas 3sp grunny fitted and it has been wired with L bypassing the speed controller, what is the sequence of the controller from switch on/cold?

I will replace the pump but I would like to know if this was done because a) wrong pump b) faulty controller c) all of the above

Also any thoughts on both rod stats overheated, look pretty new and the contacts appear to work normally.

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Re: pump speed query

Post  mike on Tue Feb 26, 2013 3:56 pm

Wrong pump.
Fit the correct one and see how you go.
What rods stats have you?
Mike
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Norfolk

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Re: pump speed query

Post  hazetimesfive on Tue Feb 26, 2013 3:58 pm

rod stats look kosher, elements appear to be pulsacoil specified from electric water heating ltd.

im assuming the bottom one is boiling out, tripping both stats eventually, I cant believe what the other engineer has done with the pump, the water coming out of the taps is far far too hot.

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Re: pump speed query

Post  mike on Tue Feb 26, 2013 4:06 pm

Are the rod stats sealed?

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Re: pump speed query

Post  hazetimesfive on Tue Feb 26, 2013 4:20 pm

yeah, sealed at 73 degree's

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Re: pump speed query

Post  mike on Tue Feb 26, 2013 4:22 pm

Could be a lot of sludge or scale making the bottom one over heat.
Has your unit got a relay?

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Re: pump speed query

Post  hazetimesfive on Wed Feb 27, 2013 12:10 am

Yes it does

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Re: pump speed query

Post  mike on Wed Feb 27, 2013 2:19 pm

Check the relay has not stuck or jammed on.
Mike

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Grundfos 15-50X18

Post  sunny.sahdev on Wed Sep 11, 2013 4:30 am

Grundfos 15-50X18 is the correct modulating pump. Also one of the stats maybe failing.

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