Operation
28
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
Form TFH-OPER1/2:3/13
Data presented here is the best available at the
time of publicaton. United Industries and/or its
representatives assume no liability for its use.
Series
TFH
ALARM
The control panel on your Tower-Flo filter is equipped with a ∆P switch repeat alarm (Timer T6). When an alarm
condition occurs, the filter will automatically shut itself off, energize its alarm light, close the dry contacts provided
for remote indication of alarm condition, and require manual attention at the filter's control panel to restart the filter
system.
An alarm condition will occur:
1) If a ∆P switch closure tries to initiate a second backwash within 15 minutes after a previous ∆P switch initiated
backwash.
2) If the ∆P switch gets stuck in the closed position.
The Alarm condition is cleared by rotating the H/O/A switch on the face of the control panel from H to O and back
or from A to O and back. When an alarm occurs, the operator must investigate the cause of the alarm. The ∆P switch
is normally open. Check continuity through the ∆P switch across control terminals #2 and #3. If there is no continu
-
ity, condition #1 exists indicating there is most likely a problem with the media bed and media inspection must be
conducted. If there is continuity, condition #2 exists and the ∆P switch must be replaced.
AUTOMATIC BACKWASH
All permanent media filter systems have a difference in pressure between fluid entering the filter (influent) and the
fluid exiting the filter (effluent). This pressure drop, commonly referred to as differential pressure or ∆P, will be
approximately 3 psi when the filter media is clean. As system water passes through the media bed, particles in the
water become trapped in the media. As the amount of trapped particles increases, so does the resistance to flow
and the ∆P. As the filter becomes increasingly loaded with trapped particles, the influent pressure will increase and
the effluent pressure will decrease.
Your Tower-Flo
®
filter is equipped with an automatic backwash control system. Primary initiation of an automatic
backwash is by the ∆P switch, factory set to close on a 10 psi difference between the influent and effluent pressures.
When this switch closes, a 30 second delay timer (T4) is initiated, and the switch must remain closed for the duration
of that 30 second time delay before backwash is initiated. This prevents random pressure surges from initiating an
unnecessary backwash.
Your Tower-Flo filter’s automatic backwash operation can also be initiated by two other means: 1) by depressing the
manual backwash push button on the face of the control panel; or 2) by the 100-hour (field adjustable)”re-setting”
backup timer (T5) which will force a backwash every 100 hours in the event that neither ∆P nor Manual initiated
backwash has occurred (∆P or manual initiation resets T5).
When any of these three backwash initiations occur, the programmable relay in the control panel will execute its
pre-programmed timing sequence as described and time lined on the next page.
