Is this how they work?

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Is this how they work?

Post  ex_directory on Thu Apr 03, 2014 1:57 pm

First I am not a plumber! Just interested how my BM2000 works!

Is it right to say ...

The right most pump is on a internal loop only taking water from the thermal store and passing it through the plate heat exchanger (PHE) and back in to the thermal store?

This right pump is controlled by the ACB based on a temp sensors for DHW that determines how much hot water to pass in to the PHE to get the DHW to the right temp, colder = less/no flow, hotter = more flow?

And finally, that the cold mains initially passes through some central coil in the thermal store before finally passing through the PHE and out to the taps?


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Re: Is this how they work?

Post  mike on Thu Apr 03, 2014 2:50 pm

Nearly right.
DHW sensor does the temperature.
PHE does the pump.
Cold goes into PHE (half of it) gets heated and out to hot taps.
Thermal store water goes round the other half of PHE
Pump voltage goes from about 130 to 230 ish.
Speeds up and down to keep the DHW 50 to 55C
Mike

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Re: Is this how they work?

Post  ex_directory on Thu Apr 03, 2014 4:18 pm

Mike, thanks for clarification!

You didn't mention the coil, is there one as it looks like the cold mains disappears inside the BM2000 before appearing again I guess at the very top, down through PHE and finally out to taps?

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Re: Is this how they work?

Post  mike on Fri Apr 04, 2014 4:16 pm

BM 2000
cold mains goes in the PHE heated then out to taps.
The DHW pipe goes into the casing but comes out of the bottom (red herring)
That is why you always get a slug of really hot water after a long period of no DHW draw off (DHW being used)
Mike

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Re: Is this how they work?

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