S
scottyboy235
Chaps,
I am after some advice regarding a brand new Grundfos UPS2 pump which appears to be drawing excessive current at start up. It is being used in a domestic gravity hot water/pumped heating system and replaced an old Selectric pump which had been in use for > 15 years in the same installation without any problems.
When the UPS2 starts up it causes the relay contacts on the heating programmer to weld themselves together. The programmer contacts have a rating of 3A resistive, 1A inductive which is way more that the 0.42A drawn by the pump when it is running. Three programmers have all gone to meet their maker with the same fault
Now the only other thing which has changed in the installation is the fitting of a one way valve on the inlet side of the pump.
Now I am worried that the one way valve may be contributing/creating this problem -> possibly by creating a temporary flow restriction at pump start up i.e. the valve remains closed until the pump has forced enough water through the system to open it up.
Anyone else had experience of a weird problem like this?
I am after some advice regarding a brand new Grundfos UPS2 pump which appears to be drawing excessive current at start up. It is being used in a domestic gravity hot water/pumped heating system and replaced an old Selectric pump which had been in use for > 15 years in the same installation without any problems.
When the UPS2 starts up it causes the relay contacts on the heating programmer to weld themselves together. The programmer contacts have a rating of 3A resistive, 1A inductive which is way more that the 0.42A drawn by the pump when it is running. Three programmers have all gone to meet their maker with the same fault
Now the only other thing which has changed in the installation is the fitting of a one way valve on the inlet side of the pump.
Now I am worried that the one way valve may be contributing/creating this problem -> possibly by creating a temporary flow restriction at pump start up i.e. the valve remains closed until the pump has forced enough water through the system to open it up.
Anyone else had experience of a weird problem like this?