350zedd Posted February 15, 2017 Share Posted February 15, 2017 I've got a negative head salamander pump which boosts the hot water to the whole house. System is about 3 yrs old new build. Recently the pump has started locking out for a few seconds due to aeration. Nothing has been altered and there are no leaks. Its worked fine for 3 yrs but has recently been playing up. Any ideas? Quote Link to comment Share on other sites More sharing options...
Rich260 Posted February 15, 2017 Share Posted February 15, 2017 Possibly pulling in air through an auto air admittance valve? Partial blockage in the feed pipe causing cavitation in the impeller? Are you getting a air through any of the outlets or a reduced flow? Quote Link to comment Share on other sites More sharing options...
350zedd Posted February 15, 2017 Author Share Posted February 15, 2017 I dont think there are any auto valves on the system. There is no reduced flow when the pump is running and no noticeable air at the outlets, although when the shower goes on first thing in the morning you can hear a large air bubble going up the pipes. Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 15, 2017 Share Posted February 15, 2017 Dodgy pump internals? As in, when they spin up to create pressure they're creating turbulence in the pump itself, so essentially it's creating it's own air. Quote Link to comment Share on other sites More sharing options...
350zedd Posted February 15, 2017 Author Share Posted February 15, 2017 I cant hear any excessive noise/turbulence in the pump and there's no drop in performance when its running Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 15, 2017 Share Posted February 15, 2017 Any awkward vibrations? Might be worth taking it out and checking the impeller anyway, easy thing to rule out. Quote Link to comment Share on other sites More sharing options...
Rich260 Posted February 15, 2017 Share Posted February 15, 2017 Would also be worth checking any non return valves or strainers on the system. A drawing of the system layout could help us be a bit more accurate to Quote Link to comment Share on other sites More sharing options...
350zedd Posted February 15, 2017 Author Share Posted February 15, 2017 Dan...will probably end up taking the pump out to check if I cant find any other cause Rich...There are no non-return valves or strainers as far as I know. Quote Link to comment Share on other sites More sharing options...
Ekona Posted February 15, 2017 Share Posted February 15, 2017 Check the vent, make sure it's not circulating round into the tank. Very unlikely, but an easy check. Quote Link to comment Share on other sites More sharing options...
Rich260 Posted February 15, 2017 Share Posted February 15, 2017 I'm with Dan, sounds like an issue with the pump. Very unlikely to be pumping over the vent as that should be under negative pressure when the pumps is in operation. Quote Link to comment Share on other sites More sharing options...
gsexr Posted February 15, 2017 Share Posted February 15, 2017 might help you mate http://www.salamanderpumps.co.uk/faq/ Quote Link to comment Share on other sites More sharing options...
350zedd Posted February 15, 2017 Author Share Posted February 15, 2017 yep, the vent is on the suction side of the pump gsexr......already been there...thanks. If it was a new installation, then I'd say it needed an essex flange on the top of the cylinder to draw water from further down and miss any rising air bubbles, but its been fine for 3 years. I'll get the pump off when I get chance and have a ganzy. Thanks for your input so far. Quote Link to comment Share on other sites More sharing options...
ioneabee Posted February 15, 2017 Share Posted February 15, 2017 its the felange .............. its always the felange (I'm sure someone will get the reference ) Quote Link to comment Share on other sites More sharing options...
350zedd Posted February 16, 2017 Author Share Posted February 16, 2017 its the felange .............. its always the felange (I'm sure someone will get the reference ) Que? Quote Link to comment Share on other sites More sharing options...
AliveBoy Posted February 17, 2017 Share Posted February 17, 2017 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.