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I have replaced a 15 year old Alpha + with a Alpha 2 15-60. It is positioned 1.5m above the boiler( feeding a 10 rads and hot water on S plan), in the attic with a 0.5m head from a header tank.
I am having great difficulty getting the new pump to self bleed. Setting it to constant fastest speed, it doesn't 'suck' hard enough to clear the air. I have had to replace the header feed with a temporary mains pressure (3 bar) input to clear the air after which it runs fine.
Any suggestions, thanks.
I am having great difficulty getting the new pump to self bleed. Setting it to constant fastest speed, it doesn't 'suck' hard enough to clear the air. I have had to replace the header feed with a temporary mains pressure (3 bar) input to clear the air after which it runs fine.
Any suggestions, thanks.