Any plumbing gurus?

Him Her

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I've just fitted a mixer shower and got an odd fault. I'm fairly certain I've got equalised pressure for hot and cold inlet to the pump which is dual. However, when I run it up the pump tends to hunt a bit and I have poor temperature control. After a while it improves and I can actually get a shower.

I tried reversing the outlets in case I'd cocked up my markings but then I get no control at all - just cold.

I THINK the water drops back pulling air in after use so I was toying with a couple of double-check valves on the pump outlets.

Any other suggestions???
 
I've just fitted a mixer shower and got an odd fault. I'm fairly certain I've got equalised pressure for hot and cold inlet to the pump which is dual. However, when I run it up the pump tends to hunt a bit and I have poor temperature control. After a while it improves and I can actually get a shower.

I tried reversing the outlets in case I'd cocked up my markings but then I get no control at all - just cold.

I THINK the water drops back pulling air in after use so I was toying with a couple of double-check valves on the pump outlets.

Any other suggestions???

Water shouldn't drop back,at least not enough as the shower mixer valve itself will act like a check valve i.e it wont let air in when closed,
I presume both are totally separate feeds from tank and cylinder to pump?

What makes you think its the pump hunting and not the mixer valve just taking time to stabilize the temp?
 
On preset temperature from the last shower the pump runs for a few minutes then stops. If I turn it to hot and let it run for a bit it usually settles down.

I picked up the the inlets from the two 20mm feeding the bath. Couldn't trace them all the way back but a nosy with the torch suggests they are equalised feeds from the cylinder cupboard - hot from the cylinder, cold from the header...
 
I picked up the the inlets from the two 20mm feeding the bath. Couldn't trace them all the way back but a nosy with the torch suggests they are equalised feeds from the cylinder cupboard - hot from the cylinder, cold from the header...

Is there any other supply drawn off these before they get to the bath,even a leaking tap/fitting might affect it,

Cannot really say for sure but I personally would only fit them with their own dedicated supplies.
 
Difficult to tell but I'm doing an adjacent bathroom shortly so I think I'll live with it for now and run dedicated supplies when I put the second pump in...

...cheers!
 
So I finally got back to this. I know, it's been a while! This is what I found in the shower-head...

P1010477.JPG

It's a flow restrictor, used in high-pressure systems, not pumped systems. Normally fitted at install time so I didn't check.

Doh!
 
So I finally got back to this. I know, it's been a while! This is what I found in the shower-head...

View attachment 71773

It's a flow restrictor, used in high-pressure systems, not pumped systems. Normally fitted at install time so I didn't check.

Doh!
I had one of them fitted to the shower head on my combi fed system. What a pain in the backside it slowed the flow down and sent a lot of back pressure back to the boiler which in turn blew it all out of the overflow. A waste of time and could damage your combi boiler. Money saving gadgets my a**e. :(
 
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