BM2000 wiring question

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BM2000 wiring question

Post  Rich01 on Mon Apr 24, 2017 1:15 pm

Having just needed a new pump and circuit board for my bm2000, I have had the manual out and been looking at how it all works.
The bm2000 has been installed with a permanent live connection to the boiler (classic slimline se9 ff) and no switched live connection, ie terminal 6 is connected and terminal 7 isn't. Is this correct?
Everything seems to work ok, but the boiler switches itself on even though there is no demand from the bm2000.

Many thanks in advance.

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Re: BM2000 wiring question

Post  mike on Thu May 04, 2017 12:12 pm

Boiler does not run according to demand as such.
The BM will ask for heat if & when the unit temperature drops approx 8 to 10 degrees.
So you could wash your hands and the boiler will not work.

Check your boiler book ref wiring
If in garage the boiler might have frost stat.

If all works can not be far out. Been like it a good while?

Mike
MGC/H2O
Norfolk

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Re: BM2000 wiring question

Post  Rich01 on Thu May 04, 2017 1:17 pm

Hi, thanks for the reply.
The boiler is in the kitchen, so no frost protection. The boiler manual isn't very helpful. The closest it gets is to say to wire timers in series.
Without the radiators on, the bm is calling for heat every 11 hours or so. The boiler is firing every 15 mins.
It's about 12 years old, but it's had 2 boiler pumps and 2 circuit boards. Maybe when one goes it takes the other with it.
I'll swap it round to a switched live and see how it goes. I've got 12 years of gas readings to compare it against!

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