Negative Head operation : normal?

[yeahdisk]

Hi

I've just had my old shower pump pump replace.

The old one was positive head; whereas my setup required a negative head pump to work (my setup is kind of borderline with about 2 feet of head. It meant my old stuart turner didn't always come on).

Anyways the system seems to be working fine - but where my old pump used to stop as soon as I turn the shower off, this new one (salamander esp cpv 50) seems to keep going for about 3 or 4 seconds afterwards??

Is this normal operation or a sign that I might have a leak somewhere?

Cheers

Chris

 

[yeahdisk]

Just checked everything and no leak that I can see

depending on how long I've had the shower on for it is more like 6 seconds.

 

[gaspro1981]

what does it say in the manufacturers instructions

 

[picasso]

negative head pumps use a small pressure vessel to detect a drop in pressure when you have opened a tap, the overrun is the pump repressurising the p/vessel and is normal operation.