Gledhill pulsacoil 2000 no h/w

[ktguk]

Been to a call out today, to this econ7 system, has x2 immersions and stats which are both fine, a pump and a heat exchanger , and im getting no hot water although water in the tank is nice and hot, im thinking the pump? Has anyone got any experience with these tanks/systems as im not sure in what order it works

thanks

 

[kme]

I`d be tempted to go for the mixing valve, TBH - the mains cold being pushed through the coil is what comes out as heat (its more like a thermal store than a standard type cylinder - works the exact reverse, with the water surrounding the coil being the primary, and the water travelling through the coil being heated by the surrounding water)

IF the tank is hot, but no hot water from taps, it tends to lead to the mix valve, which blends the hot water from the cylinder with the mains cold, to prevent excess temp. at the taps.

HTH

KME

 

[ProDave]

... in which case it's probably a job for a plumber not an electrician (unless you do plumbing as well)

I've done several of these "thermal store" systems. The controls can take a bit of working out, but they give you the advantage of mains pressure hot water, without having to have a mains pressure storage tank or expansion vessel.

 

[ktguk]

yes it is a thermal store,

its sorted pump and a sensor, was only getting around 45v at pump but once 230 to pump system works fine, as KME said nothing being pushed through the coil, a plumber helped with this also

 

[ProDave]

I'm curious to know what was the function of the pump?

Th big advantage of a thermal store system is you have mains pressure water feeding the heat exchange coil, from which emerges mains pressure hot water. No pump needed, ne expansion vessel needed.

The tank contents itself never change. It's normal to feed that from a header tank to allow expansion, and make up of any leaks.

So why complicate such a beautifully simple system by introducing a pump and a pressure switch. I would love to understand it's function and why it's there?

 

[ktguk]

I'm curious to know what was the function of the pump?Th big advantage of a thermal store system is you have mains pressure water feeding the heat exchange coil, from which emerges mains pressure hot water. No pump needed, ne expansion vessel needed.

The tank contents itself never change. It's normal to feed that from a header tank to allow expansion, and make up of any leaks.

So why complicate such a beautifully simple system by introducing a pump and a pressure switch. I would love to understand it's function and why it's there?

from what i can tell going into the heat exchanger theres a loop from the heat store and this is the bit thats pumped and then theres another loop labelled mains in on one pipe and hot water taps on the other pipe and this was going colder when pump wasnt work (water passing right though) so i think its a heat exchage between the heatstore (pumped presure) and mains (mains presure), although i could be completely wrong i'll try upload a pic of it later

link to same system

http://www.plumbteamltd.co.uk/images/gledhill.jpg

 

[kme]

erm........

The thermal store IS a heat exchanger - why the heck would you add another one in circuit???

So, lets get this right - they pump water (presumably in a closed loop) between the thermal store and a seperate heat exchanger, then heat the cold main through this heat exchanger for DHW?

one question - WHY? Makes no sense!

 

[ProDave]

Yes it does look totally weird in that picture, what is the function of that heat exchanger?

I'm thinking that this is NOT in fact a proper thermal store tank, rather, a conventional tank being used as a thermal store.

I would suggest 2 things:

Tell the customer to replace it with, or properly plumb it as a thermal store system without the pump and without the extra heat exchanger.

And fit a jacket to the cylinder. Must be the warmest airing cupboard in town.

And what's that control panel? Is it really open like that, or have you removed a cover to expose the relays. That looks like someone's home made panel.