2-10. BACKWASH OF MULTIMEDIA FILTER.
General. Refer to figure 1-5. During the backwash process, water flow through the multimedia filter is
reversed so that water flows from the bottom to the top of the multimedia filter tank.
The direction and rate of water flow through the multimedia filter during backwash is maintained by the
control and backwash diaphragm valves mounted on the multimedia filter frame.
C A U T I O N
On, Models WPES-10, WPES-20, and WPES30, to prevent damage to the equipment,
the OVER-CURRENT PROTECTION PUSH TO RESET switch on the timer must not
be depressed during operation. RESET switch should only be depressed when required
by troubleshooting or maintenance procedures.
Solid State Backwash Timer.
Models WPES-10, WPES-20, and WPES-30 (Refer to figure 2-65):
The solid state timer controls the duration and sequence of the backwash cycle. Inside the timer
box is an OVER-CURRENT PROTECTION PUSH TO RESET switch and six LED (light
emitting diode) indicator lights. The solid state timer operates automatically and does not contain
any operator controls. The six indicator lights illuminate in response to the following backwash
REGEN - Flashing light indicates backwash timer is in operation.
0 - IN SERVICE (Backwash cycle not in operation)
1 - SLOW BACKWASH
2 - FAST BACKWASH
3 - SLOW BACKWASH
4 - RINSE
Figure 2-65. Solid State Timer.
(Models WPES-10, WPES-20, and WPES-30 only)
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