How should I set this bypass valve

[onwards]

Help please....

I have a pressurised CH & HW system with an expansion tank (Boiler is Potterton Suprima 60), both are in the loft.

PS I had problems with the Suprima locking out 2 years ago and fixed it by re-soldering all the joints on the PCB. It has been working ok to now..

My question is:

My pump is 1 floor below, drawing flow down from above.
Immediately below the pump and before the auto valves, there is a bypass valve bridging across to the return flow to boiler.
Both flow and return are 22mm , the bridge is 15mm.
There is an isolating valve here that is partially open.

Should it be open fully ??

Any advice greatly appreciated...
TIA

 

[seco services]

useally about 1/4 turn open.

 

[onwards]

It's one of those valves that just has a screw to adjust it..
So vertical is fully open and horizontal it's shut so when you say 1/4 turn what do you mean in that context please....
TIA

 

[kevplumb]

View media item 14434

be better with View media item 17046

 

[onwards]

TBH I was thinking of replacing the existing valve...and your suggestion looks a bit posher.. what's it called please..

 

[kevplumb]

auto by pass valve

this one is 22 but a pair of reducers would do the sort that

most of them are angled

 

[bengasman]

An added advantage of replacing the current valve with a abv, is that it would make the system slightly more efficient and possibly quite a bit faster in heating up.