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Duplex-Alternating RO Mode
The GBE RO controller controller is capable of coordinating the alternating operation of two RO units plumbed in paral-
lel. This operation mode is designed for situations where RO redundancy is desired. As long as both RO units remain
functional, the controllers will direct one of the units, called "Unit A," to be in the "ready-to-run" mode for a one hour block
of time beginning at the top of the hour. During that one hour block, Unit A will produce RO water as long as the storage
tank is NOT full and as long as there is no pre-treatment-lockout condition in effect. During this first hour, Unit B will be in
standby mode. At the beginning of the next hour, control switches to Unit B and Unit A will switch to Standby. During that
second hour, Unit B will produce RO water as long as the storage tank is NOT full, and as long as there is no pre-treat-
ment-lockout condition in effect. The units will continue to switch over control at the top of each hour indefinitely.
For example, the master RO pumps on even hours (12:00 to 1:00, 2:00 to 3:00, 4:00 to 5:00, etc.), and the slave RO
pumps on odd hours (1:00 to 2:00, 3:00 to 4:00, 5:00 to 6:00, etc.).
If at any time while in duplex-alternating mode either Unit A or Unit B stops functioning, or enters an "error state" (for ex-
ample if the product TDS exceeds the maximum allowable product TDS level) then the other unit will take over operation
and will continue to operate as a single stand-alone mode until an operator clears the error on the first unit.
If at any time while in duplex-alternating mode the two units lose communication with each other (for example if the com-
munication cable is cut or becomes unplugged), then both units will switch into single stand-alone mode until communi-
cations are re-established and an operator instructs the units to return to duplex alternating mode using the GROC menu
screens.
In Alternating-Mode, each RO unit has its own GROC controller. A standard communication cable (P/N 01016327) is
used to connect the two GROC controllers together as shown in
Figure 32
and the units are plumbed as shown in
Figure
33. It is necessary for each RO unit have its own independent storage tank level (or pressure) switch. If a pre-treatment
lockout system is to be used, each RO must also have its own independent dry contact closure signal from the pre-treat-
ment system wired to the individual GROC controllers.
When either unit is the "running" unit, it operates as a single unit.
Connector for Additional Units (used for certain multiple unit configurations)
Unit #1 (Master)
Unit #2 (Slave)
Figure 32.
Wiring for two-pass and alternating mode.
Cat. No. 01021713
Culligan® Series G1 Reverse Osmosis
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