Circulator Pump Compatibility

[jutso]

Hi,

Over the summer we had a new pump fitted to our open vented system by a *reputable local heating company as the old Grundfos 15/50 had completely died. However since its replacement, with a Bosch 15/60 pump head, we've had trouble with circulation and a huge amount of air in the system.

Therefore my question is this, would a Bosch pump head be compatible with a Grundfos pump base?

I wasn't aware that we'd had a Bosch head fitted until I spoke with another local HE, who suggested that the repair was a bodge and the pump head is defective.

I'm awaiting the original HE to come out to confirm these points.

Thanks

*to be confirmed, potential dispute looming.

 

[cross thread]

15/60 is a bigger output try reducing the setting switch on it to 1

 

[jutso]

Thanks, I've tried running the system in position 1, 2 and 3 and the issue still exists. The current pump is very hot, i.e. too hot to touch.

System is also very noisy due to large quantities of air being circulated with no obvious leaks anywhere, plus multiple rads being cold or luke warm.

I'm working through possible causes and the pump seems the first logical point seeing as the system worked fine up until its replacement.

If not pump then my next move would be to flush the system as its been around 4yrs since the last.

 

[45yearsagasman]

You must first find out where the air is getting into the system and eliminate the cause. Blockages around the feed and vent are common and would cause air to be drawn down the vent pipe. Check this out first and come back. A powerflush will not clear these type of blockages.View media item 39013

 

[jutso]

I'll give that a try.

Seeing as I've got a possible dispute looming, would a Bosch pump head fit on to a Grundfos base? Would there be any cross compatibility issue?

Thanks.

 

[petertheplumber12]

I personally would not even try and fit 1 head make on another make base. very risky it is even possible the head doesn't fit properly and instead of leaking it is sucking air in. is the new head rotating in the same direction as the old head was? is water flowing in the right direction?

 

[petertheplumber12]

If you had the system flushed by power 4 years ago, whenever I powerflush a system I tell the owner they will never have to have it done again since I cure air ingress problems at the same time. It may just need draining and new inhibitor added.

 

[Dan Robinson]

You'd better hope that they don't have any non-barrier pipe and/or hidden leaks lurking under the floors and in the walls.


Also, does the direction of rotation matter?

 

[petertheplumber12]

I don't think you thought about that much pumps go the right way flow is flow and return is return, and air extraction works properly wrong way it doesn't.

 

[petertheplumber12]

what's up dan don't you like someone making a good suggestion?

 

[Dan Robinson]

You were talking about pump head and impellor rotational direction no?

Unless I am drunker than I thought, direction of flow is a result of the pump body...


Happy for you to make a good suggestion... Just been in the game long enough not to make promises that are going to bite me in the a7se - well most of the time

 

[Dan Robinson]

 

[ianmcd]

I'll give that a try.

Seeing as I've got a possible dispute looming, would a Bosch pump head fit on to a Grundfos base? Would there be any cross compatibility issue?

Thanks.

If the pump head says Bosch 15-60 then it is made by Grunfoss and is a compatible swap over just a very expensive way to do it as when badged Bosch they are much more expensive,

 

[matt1e]

You were talking about pump head and impellor rotational direction no?

Unless I am drunker than I thought, direction of flow is a result of the pump body...


Happy for you to make a good suggestion... Just been in the game long enough not to make promises that are going to bite me in the a7se - well most of the time

Your probably drunk Dan, but you are not wrong,
in circulators direction of flow is due to the design of the body
The direction of impeller rotation affects the flow rate and working characteristics of the pump
ie one way is much better than the other

Matt

 

[Dan Robinson]

I know, but I thought I'd go easy on the chap seeing as he's new