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- Thread starter Reshweb
- Start date
Yes, if the boiler needed an external one for pump overrun clearly it would no longer be required as water would circulate between the tee's.
You would need to look at the main pump & circuits to see if anything was required on that side but it is doubtful as the pump will simple stop when the last zone valve closes (if as we did wire it from the SWL) If you are using a variable speed it should be able to deal with all the zones closing or opening with out too much noise from TRV's & the like.
A small 5M head pump set on fixed min speed should be fine for your WB 30 but you would normally check what the MI require.
T spacing is important no more than a couple of diameters apart at the most & keep bends & other fittings away both up & down stream to stop turbulence.
P.S. Where am I sending the bill for all this design work Graham ??
T spacing is important no more than a couple of diameters apart at the most & keep bends & other fittings away both up & down stream to stop turbulence.
P.S. Where am I sending the bill for all this design work Graham ??
I can send you a cheque Chris.
Looking at the best practice low loss header article mentioned in one of the posts it suggests the primary pump should be on the return but your photo showed it apparently on the flow (F drawn on the pipe).
Does this matter ?
And one "hopefully" final question :-
In this CCT arrangement and with only one zone radiator calling for heat, the minimum flow rate will be maintained but the system may still not be able to dissipate the minimum heat output is it fair to assume that the boiler will still over heat and go into its overheat cycle ?
Looking at the best practice low loss header article mentioned in one of the posts it suggests the primary pump should be on the return but your photo showed it apparently on the flow (F drawn on the pipe).
Does this matter ?
And one "hopefully" final question :-
In this CCT arrangement and with only one zone radiator calling for heat, the minimum flow rate will be maintained but the system may still not be able to dissipate the minimum heat output is it fair to assume that the boiler will still over heat and go into its overheat cycle ?
I was looking at the position of the expansion vessel (neutral point) and the pump to ensure that the system was under positive pressure as far as possible.
Not sure why you would want it on the return.
The boiler will not be over heating, it will be reacting to the fact that the return water temperature is rising & it needs to modulate down to a low burn rate. Once it reaches the lowest setting & if the temperature continues to rise, as there is little system load, then it must turn the burner off until the temp fall & it can turn back on.
The point as previously stated is that it always has a good flow rate to base its this on.
Not sure why you would want it on the return.
The boiler will not be over heating, it will be reacting to the fact that the return water temperature is rising & it needs to modulate down to a low burn rate. Once it reaches the lowest setting & if the temperature continues to rise, as there is little system load, then it must turn the burner off until the temp fall & it can turn back on.
The point as previously stated is that it always has a good flow rate to base its this on.
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