Join Date: Nov 2004
Location: PA/MD/DE tristate area
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- Twice a day, WFIII initiates, opening its master valve and beginning the watermaking wonderment.
- With our new "bride," RO-DKstyle, we now have a pressurized well tank full of cleaned water goodness. The pressurized tank feeds WFIII for the infusion cycle.
- This is precisely timed and measured, such that at the last 10% of the cycle, the well tank is drawn down enough to trigger the pressure switch on our bride.
- The pressure switch is spliced into our master power supply that controls the entire RO system. The master power supply is 24 vac.
- Once the pressure drops enough in our well tank and the pressure switch is triggered, it closes the circuit to our master power supply, enabling the power supply to put out power to the system.
- When the power supply puts out power to the system, that power triggers some relays.
- One relay closes a circuit that enables powering of a 120 VAC power bank of outlets. This initiates powering anything that is plugged into those outlets, at the SAME time that our master power supply powers up.
- The master power supply feeds into the pressure booster pump, powering it.
- The relay 120 VAC bank powers two solenoid valves.
- Valve one is the master water feed valve to the system. It is configured such that it is open exactly the same time the pump is operational, and closes exactly as the pump stops. This is important because our pump has a bypass circuit that enables water to flow past it even if the pump is not powered. This would cause low pressure leaking all the time the pump is not powered, wasting a lot of water. So we only allow water to the pump when the pump is powered.
- The second valve is tied into a SECOND relay, the Macromatic. The Macromatic is an interval timing relay. The Macromatic is powered by the 120 VAC bank. So when the master power supply turns on, and turns the pressure booster pump on and opens the master water feed valve, the Macromatic is also powered at the same time.
- The Macromatic is tied into the second solenoid valve, which is plumbed into a flush bypass loop for the RO membranes. The Macromatic is fully adjustable for time, so DK can assign it any time she wants.
- When the Macromatic is powered, it starts its time interval. During its time interval, it powers the second solenoid valve, which opens it for that interval.
- After the prescribed time interval, the Macromatic closes the second solenoid valve.
- So, EACH time the RO system is activated, DK's RO membranes get a high pressure high flow power washing before they start their work. DK can control the length of time of this power washing by the twist of a shiny knob and the flip of a few switches on the Macromatic. She likes that, muchly.
- After the second (flush) solenoid closes, the water is then re-channeled to cross the RO membranes.
- The system then runs, producing product RO water, filling the well tank, building more pressure in the tank as it gets more full, until the pressure switch reads the end pressure and tells the master power supply to shut down.
- When the master power supply shuts down, it shuts down the pressure booster pump, the master water valve, and the Macromatic. The system is now quiescent and tight as a drum.
- The system is now re-set for the next draw-down, to be triggered again next time the pressure switch reads the lower threshold pressure.
- Fully automated, gotta love it.