Starving pump with vaccum

[jorivesud]

Replaced my pump recently, and now with this new TriStar VS I'm seeing starvation when I use the manual vaccum (thru skimmer). Any idea in preventing this?
can I use 2" vaccum hose? Would it help?
Plumbing is 1.5" from skimmer to pump, than 2" for about 1.5 feet and 1.5" all the way thru 3 way valve, filter, heat pump, SWG and back to pool. Only 1 skimmer and 1 return.

 

[mas985]

Reduce the RPM. The suction is too high and it is causing air leaks.

Also, it might help to lube the pump lid gasket and drain plug gaskets.

 

[jorivesud]

Ok, will try reducing RPM.
I was actually trying the other way around.
i will see if it works better at lower RPM next time I vaccum.
I already have the gasket lubbed and have teflon tape on drain plugs.

as a note, as soon as I unplug the vaccum hose, pump goes back to normal.

 

[denniswiseman]

That is quite normal (not right) for vacuuming to create a problem because of the extra load through the hose