Shower pump not activating under hot water demand.

[luke kendall]

Hi

Could anybody figure this one out, I have recently moved my bathroom into an adjacent bedroom, all went swimmingly but I am having problems with the shower,

1, CWS tank increased in size and height into the eaves and 350l tank
2, All pipe work done in 22mm
3, Salamander RSP 75 pump feeding
4, 2 victorian style showers on opposite walls in wet room
5, essex flange
6, 200mm+ anti gravity loop.
7, NRV removed after advice from other thread. (although made no difference to flow)
8, Brand new HWC
9, Bottle type air vent on feed (in between cylinder and pump) side of hot water for pump

One of the showers doesn't start the shower pump when turned on, rotate to cold and back and it activates, all the other hot taps are pumped and activate the pump fine.

Doing me box in a bit any ideas please?

Luke

 

[Iggifer]

Think you’d be better off in the plumbing forum as it sounds like the pump has power!

 

[luke kendall]

I know, I saw that the very second I posted, typical, its on the plumbing one now. Cheers mate, but while your on, how easy is it to air a room stat to a boiler and 2 2 port valves along with a cylinder stat?

Luke

 

[luke kendall]

Wire

 

[Iggifer]

Well it's just a case of following the S-Plan diagram, readily available on google, but use the coloured version not the BW one.

Make sure you have ample of the right cored cable, you'll want some 3, 4 and if you need to extend the zone valves, 5 core flex. You can also use 5 core down to the programmer. LNE + CH + HW.

If you understand how it works, it's really quite straightforward

 

[luke kendall]

thanks, so standard cable is fine I don't need signal cable or anything?

 

[stem]

You will need to use mains rated cables, as mains voltages are present. Also, it's not good practice to use green/yellow wires for any other purpose than earth.

The diagram below is one of the easiest S-Plan diagrams to follow. Note though, unlike the example below, some boilers need to have control of the pump so that it continues to run for a short period after the boiler has gone off. If that is the case with your boiler, there will be a set of terminals inside the boiler specifically for the pump, and it should be wired to them, rather than the orange wires from the motorised valve.