Grundfos 15-50

[Al-Glasgow]

I got a few questions on this

1) How easy should the internal screw be able to turn with a screwdriver ?.

2) Is there a way to fully bleed this to avoid damage with the boiler off ?.

3) Should the internal screw move back/forward on contact with screwdriver ?.

4) I have a bleed point close to the mid position valve, should i bleed from this point at same time as bleeding the pump ?.

Thanks for looking

Alan

 

[wilhelm]

should be very easy to turn.
yes it does move a few mm in and out.
bleed wherever you want. with pump/bolier off.

 

[croydoncorgi]

Note that the 'screw' is actually the end of the pump spindle.

 

[Al-Glasgow]

Note that the 'screw' is actually the end of the pump spindle.

Is this the same as the impeller then ?.

Are these pumps ever stripped for maintenance, or replaced when faulty ?.

Cheers
Alan

 

[Soggy_weetabix]

Well, obviously replaced when faulty.

More labour time in maintaining than just replacing.

Are you experiencing pump problems then?

David

 

[Al-Glasgow]

Well, obviously replaced when faulty.

More labour time in maintaining than just replacing.

Are you experiencing pump problems then?

David

I had a few teething problems trying to get rid of all air locks from the system.

Now running ok thanks.

I thought this pump could also boost my DHW, as upstairs is pretty poor.

Al

 

[ChrisR]

No it can't, this is for closed water systems only. Would rust in no time on fresh water - you need a shower pump.


You won't need to bleed it with the open end installed above it like that.

 

[Paul Barker]

Looks like ballofix pump valves, when you do have to change it you'll have to drain down 'cause those valves are useless.

 

[Al-Glasgow]

Looks like ballofix pump valves, when you do have to change it you'll have to drain down 'cause those valves are useless.

Are these the balofix u mention on either side of pump ?.

Paul/ChrisR,

The system currently has no protection in the FE cistern, as it has been drained numerous times over last 6 months.

Loads of black sludge flushed from downstairs Rads

Will all this fresh water be damaging the pump ?.

Alan

 

[Paul Barker]

That's the one, typically leaking, will cause premature death of pump if water gets to electrics, common problem.

 

[wilhelm]

quick question..
the balofix ..that leaks immediately a screwdriver blade touches the slot ...never mind turning it.

and the gate valve...which is a bit 50/50.....

its 2006.....youd have thought there would be summat better???

 

[lor]

6 months of fresh water will rust all your rads aswell as the pump and boiler.

 

[Al-Glasgow]

Thanks for input guys,

I guess draining a rad and injecting fernox or similar ?, Do i just need an inhibitor at this stage ?.

Al

 

[broxy]

I would treat with a sludge remover first for a week then drain all the system down then flush out with fresh water and finally treat with an inhibitor such as fernox or sentinal in the F&E.