17
The Water Saver has three sub programs.
1. Startup program
2. Main program
3. Shutdown program
Each program is comprised of multiple steps. Transition from program to program and step to step is controlled by the PLC.
Programming of individual steps is performed at the factory.
Startup Program
The purpose of Startup is to prepare the cylinder’s conducting capacitors for ion removal. Once Startup program has completed,
the PLC automatically engages the Main program.
Main Program
The Main program supplies ion reduced makeup water to a tank or directly to the evaporative unit’s cold-water basin. The Main
program loops through a series of steps. The two primary steps in the Main program are “Clean” and “Flush”. During the “Clean”
step, ions are removed as water flows through the cylinders. Reduced ion water is directed to the makeup tank or directly to the
evaporative cooling unit. To maintain efficient ion removal, collected ions must be periodically purged. “Flush” step(s) purge the
collected ions. Water flow during the “Flush” step(s) is directed to drain. Other steps are also part of the Main program. These
steps maximize “Clean” water recovery. The Main program repeats until a stop signal is received.
Shutdown Program
The purpose of the Shutdown program is to prepare the superconducting capacitors for Standby status once water demand has
been satisfied. The Shutdown program consists of multiple steps to purge collected ions from the superconducting capacitors. The
Shutdown program automatically engages when the Water Saver receives a signal from the EWLC that water demand has been
satisfied. Once Shutdown steps are complete, the Water Saver awaits a signal to restart (Standby). If a start signal is received by
the Water Saver during the Shutdown steps, the Shutdown program will complete before the Water Saver restarts.
Five-Probe Electronic Water Level Control
Electronic water level control device has five probes and an electrical enclosure. The probes are threaded into connections of
the enclosure. Probes are connected to relay cards that control the operation of the Water Saver and bypass valve.
Water level is sensed in the makeup tank or evaporative unit by the probes. Each probe has a unique length. One probe is used
as reference. Reference probe tip is always submerged. When the tips of the reference and another probe are submerged, an
electrical circuit is completed resulting in a change of relay status. The water level in the tank triggers action of the devices
connected to the level sensor control.
Makeup Tank Size
(gal) [ltr]
Ref Length (in)
[mm]
Bypass On Length
(in) [mm]
EWS Start Length
(in) [mm]
EWS Stop Length
(in) [mm]
High Alarm Length
(in) [mm]
300 [1136]
77 [1956]
62 [1575]
50 [1270]
16 [406]
12 [305]
500 [1893]
59 [1499]
47 [1194]
38 [965]
16 [406]
12 [305]
750 [2839]
89 [2261]
71 [1803]
54 [1372]
17 [432]
13 [330]
850 [3218]
103 [2616]
79 [2007]
63 [1600]
17 [432]
13 [330]
1500 [5678]
101 [2565]
83 [2108]
63 [1600]
19 [483]
15 [381]
2000 [7571]
108 [2743]
105 [2667]
78 [1981]
21 [533]
17 [432]
2500 [9464]
73 [1854]
66 [1676]
51 [1295]
24 [610]
20 [508]
Table 3: EWLC Probe Lengths
Operation
