Old(ish) Grundfos proportional pressure control circulator

[Coddey]

I'm trying to set up a Honeywell DU145 ABV with an ALPHA 15-60 130 (Model number 59526443) and work out the speed setting. The pump has one variable dial (no C1/2/3 ect).

Grundfos support have no info on the pump as its from circa 2001, so unable to help. Its running 5 rads in a small 2 bed flat with only one TRV turned down (the rest fully open).


Any advice would be welcome

 

[ShaunCorbs]

Try c1 and see how it goes if all heats up leave it there if not up it to c2

 

[Coddey]

Try c1 and see how it goes if all heats up leave it there if not up it to c2

There is no c1, c2 ect. Just one variable control

 

[ShaunCorbs]

Split the viable speed into 3 and set to 1st 3rd

 

[Coddey]

Split the viable speed into 3 and set to 1st 3rd

???

 

[ShaunCorbs]

Are you trying to set the bypass? Or the pump ?

 

[Coddey]

Are you trying to set the bypass? Or the pump ?

Both ideally.

The pump is currently set on the max setting, and the ABV on number 2. However, the previous owner admitted to playing around with it. So I though it best to start from the beginning. I dont know why the ABV is there has the loo rad has no TRV, just 2 open lock valves unless the ABV is for the hot water?? Its an S Plan system.

 

[ShaunCorbs]

S plan system?

Try turning the pump down to half and see if it heats up

 

[Coddey]

S plan system?

Try turning the pump down to half and see if it heats up

S plan: two separate valves. one for heating and the other for water.

I've tried that a week ago, and it was slightly better than full on. The rads warm up more equally on half. I imagine the next step would be to slow it down another 1/4 or keep where it is?

 

[ShaunCorbs]

Exactly keep notching it down until something stops and notch it up one