TimCL
New Member
I have had the Grundfos CU301 and 10SQE05-160 (10gpm 1/2hp 160' of head) in a 24" 40' bored well with 12gpm flow for 5 years with no issues until a month ago.
Issues started one night where the CU301 indicated overload, I believe this happens in pumps built in electronics/VFD when the pump pulls more then 4.7Amps. Waiting 5 minuets or turning off power to the system restores water every time. So after some simple trouble shooting I realized my pressure tank was holding no air and the air valve appeared to be broken, I replaced the valve and filled the take with air and the bladder held air and appears to be good. Once the tank was fixed the water pressure is perfect when it is working, but still cuts out.
According to Grundfos the overload error is most likely a problem with the pump being blocked or worn out, so I pulled the pump. I opened and cleaned the pump components. Nothing seemed worn or even dirty, just a bit of iron that rubbed of easily.
After doing some more reading I have seen all kinds of people complain about the wireline communications creating errors and overload warnings. Based on this I deiced to install a pressure switch with a CSV1A. I have to say I was doubtful about the CSV but after installing it, it's a pretty cool little valve. It is easy to use and install. That being said IMO a VFD in the house with a 3 phase pump is they way to go on a new install. Even with the pressure switch and CSV my pump still cuts out and goes into the overload mode. I now see only two options the motor on the pump is worn out and needs to be replaced or the conductors from the house to the pump are damaged. I can run a temporary wire above ground and connect the pump to see if this makes a difference.
Now finally, my question. If it is the pump what should I do. I am not a huge fan of buying another Grundfos SQE pump due to the VFD being in the well and I feel like this is what failed. I could replace the whole system with a VFD in the house and install a 3 phase pump in the well (I have 4 conductors going to the well from the house) I am not a huge fan of the cost of replacing the whole system due to it being around 3k CAN. Last option, I could buy a 2 phase standard pump and throw it in the well with the current pressure switch and CSV, this is the cheapest easiest option. What pump would you recommend for my application, I need a 10GPM pump with a minimum of 150' of head.
Cheers,
Issues started one night where the CU301 indicated overload, I believe this happens in pumps built in electronics/VFD when the pump pulls more then 4.7Amps. Waiting 5 minuets or turning off power to the system restores water every time. So after some simple trouble shooting I realized my pressure tank was holding no air and the air valve appeared to be broken, I replaced the valve and filled the take with air and the bladder held air and appears to be good. Once the tank was fixed the water pressure is perfect when it is working, but still cuts out.
According to Grundfos the overload error is most likely a problem with the pump being blocked or worn out, so I pulled the pump. I opened and cleaned the pump components. Nothing seemed worn or even dirty, just a bit of iron that rubbed of easily.
After doing some more reading I have seen all kinds of people complain about the wireline communications creating errors and overload warnings. Based on this I deiced to install a pressure switch with a CSV1A. I have to say I was doubtful about the CSV but after installing it, it's a pretty cool little valve. It is easy to use and install. That being said IMO a VFD in the house with a 3 phase pump is they way to go on a new install. Even with the pressure switch and CSV my pump still cuts out and goes into the overload mode. I now see only two options the motor on the pump is worn out and needs to be replaced or the conductors from the house to the pump are damaged. I can run a temporary wire above ground and connect the pump to see if this makes a difference.
Now finally, my question. If it is the pump what should I do. I am not a huge fan of buying another Grundfos SQE pump due to the VFD being in the well and I feel like this is what failed. I could replace the whole system with a VFD in the house and install a 3 phase pump in the well (I have 4 conductors going to the well from the house) I am not a huge fan of the cost of replacing the whole system due to it being around 3k CAN. Last option, I could buy a 2 phase standard pump and throw it in the well with the current pressure switch and CSV, this is the cheapest easiest option. What pump would you recommend for my application, I need a 10GPM pump with a minimum of 150' of head.
Cheers,