Shower pump stalling!! help!

[bikerboy]

I have recently installed a shower with a salamander 2 bar shower pump the installation is correct, but when using the shower the pump stops when the mixer tap is central i.e 50% hot 50% cold. I have fitted non-return valves on the pump outlet but this hasn't helped. any ideas?

 

[hi-spec plumbing heating]

what is the moel of the pump you have monsoon etc?

 

[bikerboy]

Its a Salamander CT75 2.1bar

 

[Breesey]

What do you consider to be correct installation?

 

[hi-spec plumbing heating]

have you fitted isolation valves before the pump ?

 

[bikerboy]

Yes have fitted isolation valves on the inlet side of the pump, and recently had a plumber in to carry out other work and he checked the install and confirmed it was ok, have a surrey flange fitted to the hot water cylinder supplying the hot side and a tap of the main water tank in the loft supplying the cold side.

 

[hi-spec plumbing heating]

what iso's have you fitted ?

 

[bikerboy]

15mm push fit ball valve type ones (all pipework and fittings are 15mm)

 

[hi-spec plumbing heating]

remove them they have a restricted diameter inside fit these

http://www.screwfix.com/search.do;j...ECSTHZOCFFQ?_dyncharset=UTF-8&fh_search=11085

they are full bore and don't have a restriction.

so much for your plumber telling you.

your instructions will tell you not to fit ballofix or restricted valves to the pump supply.

 

[bikerboy]

Would that apply to these as these are the ones i have fitted?

http://www.screwfix.com/app/sfd/cat/pro.jsp?cId=100985&ts=32675&id=25911

 

[hi-spec plumbing heating]

yes i would say so they are restricting the supply.
remove one and look up the hole, the hole is not 15mm.
you need to keep your supply as large as you can or your pump will be pumping and your supply can't cope.