pump speed - no markings ! just a screw slot.How to adjust ?

[slackjawgaze]

Hi

On my c/h pump there is a large screw slot on top...

Which way is max and which way is min ? (no markings).

Thanks

Carl.

 

[wilhelm]

 

[Newboy]

The large slotted screw is not the speed control - it allows access to the rotor and enable you to bleed air from the pump.

Speed control is usually a three position rotary switch on the side of the pump body - not all pumps are variable speed.

 

[doitall]

More too the point Why play with it

 

[slackjawgaze]

I'm thinking of adjusting it because....

A plumbing engineer adjusted it to max recently (from min) !

He did this to try and get air out of the c/h system - i sometimes get
loud banging pipes when having hot water on only (after boiler on for 5mins) - but if i turn on the c/h the noise in the pipes stop !

 

[Slugbabydotcom]

My old thorn olympic has done the same thing for the last 20 yrs. I have a 'just right' setting of 3½ on the boiler stat where my HW is hot enough and the boiler doesnt kettle.

Not enough info to say anything more specific to your case so >>>>

Read this //www.diynot.com/forums/viewtopic.php?t=6026

 

[oilman]

Hi

On my c/h pump there is a large screw slot on top...

Which way is max and which way is min ? (no markings).

Thanks

Carl.

This sounds like the problem I have, sometimes our house gets cold, what should I do?

 

[doitall]

I'm thinking of adjusting it because....

A plumbing engineer adjusted it to max recently (from min) !

He did this to try and get air out of the c/h system - i sometimes get
loud banging pipes when having hot water on only (after boiler on for 5mins) - but if i turn on the c/h the noise in the pipes stop !

Loud banging is telling you theres something wrong with the circulation in hot water only.

Call an engineer that can sort it before the boiler packs up completely

 

[kevplumb]

 

[wilhelm]

kev, you been going to art classes??

 

[kevplumb]

 

[kevplumb]

More too the point Why play with it

wots wrong with that like

 

[wilhelm]

[/img]http://www.prideofmanchester.com/theatres/Palacetheatre/nov28-dodd.jpg
[/img]

thought so

 

[wilhelm]

.....sabotage

 

[kevplumb]

yow made a right dogs wotsits of that