52
Culligan® Premier Series Automatic Deionizer
52
Cat. No. 01024000
Backwash Cation
The Failsafe Valve (A2) is closed preventing water and/or chemical from being accidentally sent to the process. The first
regeneration cycle is the Backwash Cation Cycle. The Cation Inlet Valve (C2) is closed, and the inlet raw water is directed
to the bottom of the Cation Column through the Backwash Cation Inlet Valve (C1). The water flows out through the dis-
tributors and up through the cation bed providing for at least 50 percent expansion of the resin. The water then flows out
through the top collector to drain through the Backwash Cation Outlet Valve (C4) and the Backwash Flow Control.
C1
C4
A5
C2
A3
A1
A2
A4
C3
A6
C5
CP
AP
PR
TO DRAIN
Figure 16.
Backwash cation cycle.
The Backwash time is usually ten minutes. It takes approximately six of those minutes before the resin has reached full
expansion. The backwash cycle flushes the particulate matter collected during the service cycle down the drain, and pre-
pares the cation resin for the introduction of the acid regenerant.