Alternety
Like an engineer
I have spent hours trying to figure out the issues involved. I am confused. I am working on this for a friend. He has a Grundfos MQ3-45 pressure pump. The pump is cycling at a short interval when water is being used. It is not clear to me, from much reading, how that pump actually functions. But I believe that action is wrong.
I have read a whole bunch of stuff about this configuration. Many conflicting views. As a help to me, and others with similar problems, can you guys provide some concrete information on how the whole thing works and the failure points. Let us not go to discussions of CSV. I am trying to work with the existing equipment.
As I understand it:
The public water is fed to a Grundfos MQ3-45. Storage for the output of the MQ consists of the small tank included in the MQ and a very small additional pressure tank installed by a wandering plumber. I have no information on what people have done with the internal back flow components of the MQ.
I have not found anything I understand relating to how the pump manages to provide an appropriate pressure to the output. This information is consistently glossed over.
If the MQ sensors are not performing in a useful manor, how do I fix that.
I have a number of thoughts/questions about the system.
So, how do I deal with an MQ that may or may not be operating properly? Trouble shooting suggestions welcomed.
I have read a whole bunch of stuff about this configuration. Many conflicting views. As a help to me, and others with similar problems, can you guys provide some concrete information on how the whole thing works and the failure points. Let us not go to discussions of CSV. I am trying to work with the existing equipment.
As I understand it:
- There is a flow switch on the pump input that must operate (i.e., sense flow) before the pump will begin to operate properly.
- There is a pressure switch which controls the output of the pump (but no control mechanism I can find).
- There is a very small pressure tank that supposedly deals with output fluctuations.
- There is no mechanism I have identified to manage these two parameters
The public water is fed to a Grundfos MQ3-45. Storage for the output of the MQ consists of the small tank included in the MQ and a very small additional pressure tank installed by a wandering plumber. I have no information on what people have done with the internal back flow components of the MQ.
I have not found anything I understand relating to how the pump manages to provide an appropriate pressure to the output. This information is consistently glossed over.
If the MQ sensors are not performing in a useful manor, how do I fix that.
I have a number of thoughts/questions about the system.
- How is the system output pressure controlled. I have seen no way to actually set the output pressure. The documented max MQ pressure seems to be way to high. The pressure switch can be changed if it is removed and adjusted. But it is rather a trial and error adjustment. Nothing on flow control.
- How does one control the threshold for the input flow.
So, how do I deal with an MQ that may or may not be operating properly? Trouble shooting suggestions welcomed.