Pressure Pump - pressure switch setting?

[Woody Allan]

I have a Grundfos CH2-30 pressure pump and no instruction manual and the Grundfos website is of no help. Got someone in to adjust the pressure switch when I wasn't at home so I was unable to watch over their shoulder and thereby avoid paying them to come next time it needs adjusting.

Can anyone help with how you set the pressure switch limits. ie what dial does what with the pressure switch?

Allan.

[outback]

Remove plug from socket. HAve a gander at the pump. Where the electrical cord enters a control box, remove the cover, in there you will find the pressure switch. It will either have a rotary dial which you can grab with ya fist, or a stud requiring a spanner. In either case you shoulod find an indicator arrow or some such thing, maybe even a + and -. By turning the knob/stud this will adjust the pressure at which the pump turns on/off.

Why does the switch require adjusting?

If it is an old pump, it may be due to the spring weakening, but more likely a problem with the pressure tank, or maybe even the pressure switch blocking.

[Woody Allan]

Thanks for that outback. The need is that we have three different tanks feeding at different times and the head of each varies greatly and this seems to effect when the pump kicks in. Particularly a problem in the shower with hot and cold - particularly cold here in Tassie.

[outback]

I don't have a Ch model, I've got a JB. I also use three tanks, whilst two are sorta similar heads, the third is miles different. I have neve noticed any difference, and can't see how there would be any, as it is the output side which the pressure switch is hooked to. Normally this is the pressure tank.

Are you sure there isn't a block in one of the inlets? Are they a flooded suction or does the pump have to "suck" the water up?

[Woody Allan]

Will check out the blockage possibility. Two of the tanks have a good head - could survive without the pump. The main tank we use has the base about level with the pump so it should still feed the pump.

I have noticed it to be more of a problem when the inline filter is close to needing replacement.