I have a SCALA2 pump, newly installed, that at certain times will cycle on and off constantly while a tap is open. Essentially what happens is that while a tap is open the pump gets the pressure up to to the set point (70 psi), cuts off, pressure drops to around 60, then the pump kicks back on and it does that all over again. This video (not made by me) is exactly what I am seeing:
At other times, the thing runs like a champ. I open a tap and it runs until the tap is closed. I open another tap and it seamlessly keeps the pressure constant. Another tap, again, seamless. I've had 5 taps open at once all at 70psi, so when it works its pretty cool.
I'll add that I have read the forums and understand there is some difference of opinion on VFDs and grundfos pumps. But, I've got the SCALA2 installed and would like to try to make it work. I have 10 more days to return it for a full refund, so if I cannot get it to work properly i will uninstall and perhaps go with a CSV type solution.
Questions:
1. Does anyone know what causes this issue?
2. Could it be the internal pressure tank? It is precharged at the factory to 18.5 psi. Anyone know what it should be set to for incoming pressure of 40 and outgoing of 70?
3. Could this be caused by fluctuating incoming pressure. I do notice that sometimes my incoming pressure is 40, others its 45, sometimes even 50. I am wondering if adding a pressure reducing valve to the supply side to keep the pressure at 40 (maybe even set it to 35) might resolve the issue?
Thanks!
At other times, the thing runs like a champ. I open a tap and it runs until the tap is closed. I open another tap and it seamlessly keeps the pressure constant. Another tap, again, seamless. I've had 5 taps open at once all at 70psi, so when it works its pretty cool.
I'll add that I have read the forums and understand there is some difference of opinion on VFDs and grundfos pumps. But, I've got the SCALA2 installed and would like to try to make it work. I have 10 more days to return it for a full refund, so if I cannot get it to work properly i will uninstall and perhaps go with a CSV type solution.
Questions:
1. Does anyone know what causes this issue?
2. Could it be the internal pressure tank? It is precharged at the factory to 18.5 psi. Anyone know what it should be set to for incoming pressure of 40 and outgoing of 70?
3. Could this be caused by fluctuating incoming pressure. I do notice that sometimes my incoming pressure is 40, others its 45, sometimes even 50. I am wondering if adding a pressure reducing valve to the supply side to keep the pressure at 40 (maybe even set it to 35) might resolve the issue?
Thanks!