Over the weekend I finished what I thought would be the correct programming for my saltwater storage bin. I have a float high and low in the container. I have a solenoid that controls the RODI refill. The high float closes and energizes the solenoid to refill the container. I have the solenoid set up as a switch and that works fine. I also have a heater in the container that is also controlled by the high float. The heater is off when the high float is closed and on when the float is open. There is an alarm set up for the heater.
The piece that I have problems with is the mix/return pump. I have an external pump tied to the storage tank. I use it to mix saltwater and to pump NSW from the storage tank to my display tank during water changes. When I do a water change I want the mix/return pump to be off when the low float closes. As the water level rises when the storage container refills, I want the return/mix pump to ignore the low float and only return to operation when the high float opens. I thought I had this programmed correctly by using a spare output on a PC4 but today both the high and the low floats in the container are open as the container is full but the spare output on the PC 4 is still on.
Let me know how I should program this correctly if you understand my logic and/or operation.
Thanks.