Problem With Boiler Replacement

[joben1]

Hi All,

I have a thermal store central heating system which has 2 pumps, one for hot water and one for central heating. My boiler has been replaced and I know they had trouble with the wiring. They told me that one of the pumps wasn't calling for heat but now all is ok. However, I have found that both the hot water and central heating are using just one of the pumps. I called them and they told me that it seems that modern boilers don't work with 2 pump systems, and the solution is to remove one of the pumps and fit a valve that diverts the flow of water depending on what's calling for heat (presumably a Y plan 3 port valve that allows both to call for heat?).

This doesn't sound right to me. Surely there are boilers that would work with my system? Are they pulling a fast one? Any advice would be much appreciated.

 

[garygvl]

so youve got electrical training so at least use a multimeter to confirm which pumps are being run at what time

 

[ballvalve]

One pump takes water out of the store back to boiler for reheat and the other puts water in to the rads.Hot water is off cold main, cold in hot out via blender.

 

[joben1]

you say the old store has been replaced like for like where are the pics of the new one

New store

 

[joben1]

so youve got electrical training so at least use a multimeter to confirm which pumps are being run at what time

Don't have one, was a telephone engineer not an electrician and have been out of the game for 20 years.

 

[ballvalve]

Who cut the pipe and left an open end and is the cold main.

 

[ballvalve]

Pump on the 28mm pipe i would is the boiler pipe work.

 

[joben1]

Who cut the pipe and left an open end and is the cold main.

Like I said, that pic was taken in the middle of renewing the old store.

 

[garygvl]

that store stat is extremly low on new cylinder

 

[king of pipes]

This explains a bit more bud get a electrician to check the wiring . Kop

 

[joben1]

This explains a bit more bud get a electrician to check the wiring . Kop

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Thanks, just the diagram needed.

 

[dan_the_plumber]

Thermal store pump should be wired in to come on with the boiler demand (grey in perminant live, switch live orange to pump and boiler)
Then heating pump controlled via time clock and room stat.