Cary,
I have had a Grundfos CU301 w/a 15SQE-250 running my combined domestic
and GWHP system for the last 11 months. Recently, I started getting
the "VOLTAGE ALARM" coupled w/the "NO CONTACT WITH PUMP" LEDs lighting
up! Pump still locks in at the 40PSI, but surges at startup and stops
at 90PSI. Very unstable.
Took your advice as I have seen posted on this and several other well
pump related sites. I originally did not side w/the CSV camp and went
w/the VFD camp as seen above. After reviewing many of your well argued
and calculated discussions on these two systems, I decided to purchase
the CSVZ1 and a standard pressure switch (30/50) w/auto-start-stop
switch.
I have attached several pix showing my CSV replacement so you can see
my setup. Also, I attached a diagram of my domestic & GWHP well
system. It is a Standing Column Well (SCW) that recycles back to the
source well and uses the domestic water usage to maintain the well's
thermal dynamics (~54-60 degrees).
I really like the "simplicity" of the CSV as opposed to the "complex
technical & faulty" VFD setups!
Thanks,
Greg
