29
United Industries, Inc.
P.O. Box 58
Sterling, KS 67579
800-835-3272 • 620-278-3160
Fax 800-500-3115 • 620-278-3115
www.towerflo.com
Data presented here is the best available at the
time of publicaton. United Industries and/or its
representatives assume no liability for its use.
Form TFH-OPER2/2:11/08
Operation
Series
TFH
BACKWASH TIME LINE
TIMER T1
TIMER T2
TIMER T3
TIMER T4
TIMER T5
TIMER T6
PUMP
Filter Mode
Filter Mode
Change
to BW
Return
to Filter
2:30 M
ON
OFF
OFF
ON •
ON
2:30 M
1
2
3
4
5
30 S
100 H
100 H
19 M
5 M : 30 S
VALVES
Backwash Mode
∆P Switch Closure
Manual Pushbutton or T5
AUTOMATIC BACKWASH OPERATION
The series of events controlling automatic backwash are described below. The programmable relay follows these
steps and timer identifications in its program of operation.
1. Differential pressure switch closes, initiates Timer T4, and remains closed for 30 seconds.
2. Timer T4 elapses, or the manual backwash push button is pressed, or Timer T5 elapses, which initiates
Timer T1 and Timer T2. Timer T1 energizes the control relay to the valve actuators changing the valves to
backwash position. Timer T2 interupts the pump motor contactor stopping the pump while the valves rotate.
3. Timer T2 elapses, pump motor contactor is re-energized restarting the pump. Filter is now in backwash mode
for 3 minute flow time.
4. Timer T1 elapses, Timer T3 initiated. T3 interrupts pump motor contactor stopping the pump. Timer T1 de-
energizes the control relay to the valve actuators changing the valves back to filter position.
5. Timer T3 elapses, pump motor contactor is re-energized restarting the pump. Filter is now back in filter
mode.
NOTE:
Timers T5 and T6 are field adjustable through the PARAMETERS screen on the programmable relay. All
other Timers are password protected and can only be changed with consultation from Tower-Flo
®
.
• NOTE:
On filter systems equipped with optional fresh water backwash from municipal water supply, the pump is
not energized for backwash. Factory setting of Timer T2 will be changed to 5:30.
