Shower Pump Impellers

[DaveHewitt]

Hi,

I have a salamander twin impeller shower pump (CT50+) and was just wondering what happens if you have a cold shower? I.e. will is sense the cold water flow and run the hot side dry or can these pumps switch-off individual impellers?

Didn't want to damage the unit by only running cold through it so wondered if they can handle it?

Thanks a lot,

 

[ianmcd]

Nothing to worry about just running the cold the impellors are individual

 

[DaveHewitt]

Thank you - much appreciated.

On a similar theme, I need to re-plumb where the hot water is fed from because it is sucking air via the vent.

This means that the pump only pumps cold when first started, then when the mixer is turned off and then on again it works perfectly.

Any idea if sucking air through the pump will cause any damage (if only for say 10-seconds initially) before the hot gets pulled through?

I was assuming that there would be no hot flow so just the cold impeller was running?

Thanks

 

[Jackrae]

Think you will find that these two impellers are driven by a single shaft motor ie both impellers rotate together. Running one side completely dry will do the seal no good but it would be reasonable to assume that both impellers have water swishing around, even if not flowing via the shower head.

As to the problem of drawing air, it sounds like you need to have a look at your feed side plumbing since there's no way such a system should draw air.

 

[DaveHewitt]

Thank you for the information - much appreciated.

Its not a recommended installation so wasn't going to mention too much!

Basically the pump is in-line with the old gravity-fed shower pipework in the loft. The original hot water feed is taken from near the vent pipe.

Spoke to salamanda today and they recommended moving the supply to the below the main T (where the pipe splits after if exits the HWC).

I appreciate that the pump should be near the tank, flanged etc, however, as an interim solution, I'm wondering if what salamander suggested would work?

Dave.