water pump question

[600rob]

Just a quick question..about my grunfos water pump

On the water pump at the base of my water tank there is a switch with positions i, ii & iii what do the different switch positions change?

its set in the middle at position ii at the moment just wondered what the effects of mving the swich position will be

 

[muggles]

It changes the speed of the pump, and therefore the rate of circulation of your heating system. It should not be changed as, assuming the system was commissioned properly when installed, it is set to the optimum speed for an even distribution of heat through your house

 

[600rob]

Thanks mate