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g. After Side A’s chemical has been replenished, EMPTY and STAND-BY lights flash indicating Side A
source has been replaced.
h. The operator depresses RESET push-button completing side A source replenishment and placing side
A source in stand-by status for subsequent automatic switchover to Side A source when Side B on-line
source becomes depleted.
i. When the side B on-line source is depleted, the EMPTY light for Side B illuminates and feed transfers
automatically to Side A.
j. Valve B closes as indicated by the flashing CLOSED light while Valve A stays closed and Side A
remains in stand-by.
k. Only when Valve B is completely closed does Valve A open now feeding from Side A.
l. Side B source is replaced. EMPTY and STAND-BY lights flash indicating Side B source has been replaced.
m. The operator depresses RESET push-button completing Side B source replenishment and putting Side
B source in stand-by status for subsequent automatic switchover to Side B source when Side A on-line
source becomes depleted.
Side
Empty
Open
Closed
Stand-by
A
O
O
O
B
O
O
Valve A open and Side A feeding. Side B in stand-by.
Side
Empty
Open
Closed
Stand-by
A
O
O
O
B
*
O
*
Side B source has been replaced.
Side
Empty
Open
Closed
Stand-by
A
O
O
O
B
O
O
Side B empty and Valve B closed. Valve A open and Side A feeding.
Side
Empty
Open
Closed
Stand-by
A
O
O
B
O
*
O
Side B empty and Valve B closing. Side A remains in stand-by.
Side
Empty
Open
Closed
Stand-by
A
O
O
B
O
O
O
Valve B open and side B feeding. Side A in stand-by.
•
Side
Empty
Open
Closed
Stand-by
A
*
O
*
B
O
O
O
Side A source has been replenished.
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
