Genius or a Problem (New Whole House Pump)

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ChrisNason

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Kingston, London
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Just in the middle of an install where the plumber has left us connected but very untidy pipe work (interim?)
We have a new downstairs bathroom being created and first fit plumbing in place. The system is open vented and the embedded picture is the cold side of the pump (hot is similar) Pump (Grundfos) is in place and pipes fitted. We can still shower with this pipe arrangement.
However, I can see a circular loop through the existing pipes. But it will also allow flow to bypass the pump if we flush a toilet downstairs in the night with the pump turned off. Potentially allowing silence overnight (with a timer on the pump)
Thoughts?

IMG_3992.jpg
 
1. Shower pumps are meant to have their own supply from the cold water storage cistern (CWSC), not use the existing one. Check the manufacturer's instructions for the Grundfos pump. The take off from the CWSC is meant to be below the take off for the hot water cylinder (HWC), so that if the water is exhausted, the hot cuts out before the cold.
2. As it stands, there is nothing to stop water being pumped back into the CWSC.
3. The hot side cannot be similar:
3.1 As the hot supply is taken from the top of the HWC.
3.2 It requires an air free hot water supply from the HWC.
 
So plenty of problems.
When I said the hot is similar I meant the pipe arrangement after the exit from the HWC. It has a separate supply from the cold water tank to the base of the HWC (existing). Then from the top of the HWC (Surrey Flange to be fitted) it drops down in the existing hot water supply to the rest of the house but has a similar arrangement to my drawing of the cold. A new pipe out to the pump input then a pipe from the output that has a tee feeding the existing house hot supply one way and the new bathroom the other way.
Perhaps he is returning to cut the route to the existing system so that the pump inherits the tank feed?
 
Starting to think this is just an interim pipe arrangement to keep us connected.

But can a whole house pump be turned off to prevent overnight noise when flushing a toilet?
 
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