System and method for reducing water pump cycling and TDS creep when producing purified water

A control system for reducing pump cycling and TDS creep when producing purified water, wherein the control system comprises:

• a feed water source, wherein the feed water source is at least a fresh water source, wherein the feed water source is in fluid communication, via a feed water conduit, with an ingress of a processing reservoir configured for storing processing water;
• an adjustable fresh water flow valve for controlling a fresh water flow from the fresh water source to the processing reservoir;
• a pressure vessel assembly in fluid communication with the processing reservoir and having a reverse osmosis membrane for producing purified water from the processing water received from an egress of the processing reservoir;
• a pump for forcing the processing water from the processing reservoir though the reverse osmosis membrane to produce the purified water;
• a purified water reservoir in fluid communication with the pressure vessel assembly and for receiving the purified water from the pressure vessel assembly;
• a purified water conduit providing fluid communication from the pressure vessel assembly to the purified water reservoir;
• a second purified water conduit downstream from the pressure vessel assembly providing fluid communication between the purified water conduit back to the processing reservoir;
• a purified water valve for diverting a purified water flow through the second purified water conduit back to the processing reservoir;
• a first waste water conduit providing fluid communication from the pressure vessel assembly to an egress of the system;
• a second waste water conduit downstream from the pressure vessel assembly providing fluid communication from the second waste water conduit to the processing reservoir;
• a waste water valve for diverting a waste water flow through the second waste water conduit to the processing reservoir;
• a central control unit, wherein the central control unit is in electrical communication with a processing reservoir water level sensor, the purified water valve, the waste water valve, and the adjustable fresh water flow valve;
• wherein the purified water valve is configured to divert the purified water flow through the second purified water conduit to the processing reservoir and the waste water valve is configured to divert the waste water flow through the second waste water conduit to the processing reservoir to maintain the pump in a pumping condition such that the amount of processing water is at least as great as a processing water minimum threshold, thereby reducing cycling of the pump and TDS creep;
• and
• wherein the central control unit is configured for controlling the fresh water flow from the fresh water source by sending signals to adjust the adjustable fresh water flow valve such that the fresh water flow maintains the amount of processing water within the processing reservoir at a level that satisfies the processing water minimum threshold thereby reducing a frequency at which the adjustable fresh water flow valve moves between a fully open and a fully closed position and to prevent water hammering at the fresh water source.

A method for reducing pump cycling and TDS creep when producing purified water from a water source, the method comprises:

• providing a feed water conduit providing fluid communication from a feed water source to the processing reservoir;
• providing a processing reservoir for storing processing water from the feed water source;
• providing a pressure vessel assembly in fluid communication with the processing reservoir and having a reverse osmosis membrane for producing purified water;
• providing a pump for forcing the processing water though the reverse osmosis membrane to produce purified water;
• providing a processing reservoir water level sensor for monitoring an amount of the processing water in the processing reservoir;
• providing a purified water reservoir in fluid communication with the pressure vessel assembly and for receiving purified water from the pressure vessel assembly;
• providing a purified water conduit providing fluid communication from the pressure vessel assembly to the purified water reservoir;
• providing a second purified water conduit downstream from the pressure vessel assembly providing fluid communication between the purified water conduit back to the processing reservoir;
• providing a purified water valve for diverting a purified water flow through the second purified water conduit back to the processing reservoir;
• providing a first waste water conduit providing fluid communication from the pressure vessel assembly to an egress of the system;
• providing a second waste water conduit downstream from the pressure vessel assembly providing fluid communication from the second waste water conduit to the processing reservoir;
• providing a waste water valve for diverting a waste water flow through from the second waste water conduit to the processing reservoir;
• providing a central control unit for receiving signals, wherein the signals comprise signals from the processing reservoir water level sensor, signals from controlling the purified water valve, and signals from the waste water valve;
• and
• wherein if the amount of the processing water in the processing reservoir is less than a processing water minimum threshold, then diverting at least one of the waste water flow and the purified water flow back to the processing reservoir to raise the amount of the processing water to maintain the pump in a pumping condition such that the amount of the processing water is at least as great as the processing water minimum threshold, thereby reducing cycling of the pump and TDS creep.