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Replaced ugly wall pump for hidden inline pump made it worse

Postby jadell » Mon Jun 06, 2011 11:07 pm

Some advice please as I can not understand what I have done wrong.

I have replaced our shower suite.
Originally I had a bath with shower over which was a wall hung pumped unit gravity fed.

I have removed the bath and built a purpose shower enclosure instead.

Fitted a Salamander RSP50 pump, situated a lot closer to the floor (about 16 inches above behind a false wall. And installed a Triton Capella mixer unit with drench shower and hand held shower.

However. the pump often fails to come on unless the hand unit is put on the floor. Which suggests negative head. And when it does come on it gets slower after a minute or so and sounds like it is struggling to draw water. Swicth off and on and it's Ok for a minute or two again. If you switch it to the overhead drench head it is useless.

what's baffling me is that the new pump is more powerful and is lower than what was orginally there. And the pipe runs are now shorter than before. So why the negative head issue. I wish I'd stuck with the ugly wall mounted pump now.

Any ideas.

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Simply Build It

Postby jadell » Tue Jun 07, 2011 3:47 pm

An update for you.

I disconnected the mixer and ran pipes straight from the outlets in the walls. Like this I get 5litres per minute on both Hot and Cold.

Put the mixer back in and this reduced to 1.5

Removed the valves in the mixer and this increased to 2.4

It is now working but not as good as the old unit. I am not impressed with the small bore of the Triton Mixer.

Lastly, the pump does seem to be getting air in it after about 10 minutes of showering. I am not sure why.

I fear I may now need to remove the mixer to get the air out of the pump again.

Any ideas?
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Postby stoneyboy » Tue Jun 07, 2011 10:15 pm

Everything you have described indicates insuffient head of water. If you can, increase the height of the cold water tank. Also check the hot supply for the shower is from a separate tapping or flange on the hot water tank.
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