Whole house pumping and secondary circulation .
- Thread starter Bigburn
- Start date
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Don't even think about it.
The secondary return would be under presure, therefore the storage tank would flood, what would control the pump as any movement would hold it on.
What you should do is install a break tank, pump set and an un-vented cylinder, and pump the cold feed, the secondary circuit can then be connected as normal for an unvented cylinder.
The secondary return would be under presure, therefore the storage tank would flood, what would control the pump as any movement would hold it on.
What you should do is install a break tank, pump set and an un-vented cylinder, and pump the cold feed, the secondary circuit can then be connected as normal for an unvented cylinder.
This will work if the flow switch in the main pump is directional.
The triangles in circles are pumps, the one with the bar is a one-way valve, and the cross is a gate valve to restrict flow.
If the main pump flow switch is not directional but you reduce the 2ndr circ enough it won't switch on.
It is not a neg head type pump.
There are other ways...
The triangles in circles are pumps, the one with the bar is a one-way valve, and the cross is a gate valve to restrict flow.
If the main pump flow switch is not directional but you reduce the 2ndr circ enough it won't switch on.
It is not a neg head type pump.
There are other ways...
O dear Chris, back to the drawing board please.
The first drawing will no work because you are trying to circulate cold/warm water, and in any case it will not return through the booster pump.
The second drawing will blast the water through the cylinder and into the storage tank every time the booster pump runs.
The first drawing will no work because you are trying to circulate cold/warm water, and in any case it will not return through the booster pump.
The second drawing will blast the water through the cylinder and into the storage tank every time the booster pump runs.
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Your second drawing Chris.
Surely when the whole house delivery pump operates (as and when someone opens a tap or turns on a shower ) then the water will take the secondary return water route back to the cylinder.
thats assuming the WHP (whole house pump) fires up via the flow switch as another outlet is provided to the taps lower down which could deliver cooler water.
I think it also rules out using a negative head system.
(and thanks for the replys by the way, much appreciated)
Surely when the whole house delivery pump operates (as and when someone opens a tap or turns on a shower ) then the water will take the secondary return water route back to the cylinder.
thats assuming the WHP (whole house pump) fires up via the flow switch as another outlet is provided to the taps lower down which could deliver cooler water.I think it also rules out using a negative head system.
(and thanks for the replys by the way, much appreciated)
OK guys, get a load of this, you can shoot me down if you wish.
I specify a cylinder with a second coil fitted in the top section.
The WHP (whole house pump) pumps the hot through this coil any time someone opens a tap.
On the return leg of the secondary loop is fitted the secondary circulation pump (could be the grundfos comfort with integral timer)
then NRV and T's into the main supply branch before the top coil.
The secondary circulation now takes it heat from the top coil inside the pressurised side of system so the negative head system can be used.
I specify a cylinder with a second coil fitted in the top section.
The WHP (whole house pump) pumps the hot through this coil any time someone opens a tap.
On the return leg of the secondary loop is fitted the secondary circulation pump (could be the grundfos comfort with integral timer)
then NRV and T's into the main supply branch before the top coil.
The secondary circulation now takes it heat from the top coil inside the pressurised side of system so the negative head system can be used.
The WHP gets its water as usual via a surrey or essex flange Doitall.
The cylinder remains vented as usual .
Basically what I am suggesting is circulating the secondary loop through the top coil
The heat is then delivered indirectly to the loop instead of directly when pumped through the cylinder as in conventional systems.
The cylinder remains vented as usual .
Basically what I am suggesting is circulating the secondary loop through the top coil
The heat is then delivered indirectly to the loop instead of directly when pumped through the cylinder as in conventional systems.
Bigburn said:
No,
If you insist there are two ways of doing it.
The obvious way is to pump into the cold feed of an unvented cylinder.
The only other way and it can starve the pump unless you install oversize pipes, and that is to feed the WHP from the secondary circuit.
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