5
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-DESC:2/17
Description
Series
TFH
The information below provides a general description of the main components of Series TFH filter systems. Details
of standard, optional, and additional components are found in the
Project Specifications
document, on the follow-
ing pages.
MAIN COMPONENT DESCRIPTION
A. HIGH RATE SAND FILTER VESSEL
This permanent media, high-rate sand filter is a vertical pressure vessel constructed of epoxy lined carbon steel
designed for a maximum working pressure of 100 psi with a special influent baffle in the top of the tank, a bed of
filter sand and a mechanical underdrain system which collects the filtered water and directs it to the return piping
system. The filter operates under pressure. When closed properly and operated without air in the water system, this
filter will operate safely. The system is equipped with an automatic air relief valve and 0-160 psi influent and effluent
pressure gauges mounted in a common panel.
B. VALVE ASSEMBLY
The valves are brass, 3-way ball valves with a single, 24VAC electric actuator and mechanical linkage.
C. CONTROL PANEL
The control panel provides all controls for automatic backwash operation. The standard control panel is UL
®
and
cUL
®
Labeled in a NEMA 4X corrosion resistant fiberglass enclosure. Backwash is initiated by: 1) differential pres
-
sure switch (external to the enclosure); 2) manual backwash pushbutton on face of control panel; or, 3) 100 hour
“re-setting” timer (∆P switch closure or manual initiation resets timer) for backup initiation. The sequence of the
operation is described under the Operation section of this manual. The controls automatically stop the system’s
pump whenever valves are to be shifted which prevents water hammer, pipe flexing, and the risk of damage to col-
lection laterals in the vessel. Standard control panels include five sets of dry contacts for BMS interface: 1) alarm on
repeat backwash; 2) remote pump on/off with HOA switch; 3) remote indication of common alarm (motor trip indica-
tion; 4) remote indication of backwash operation; 5) remote initiation of backwash; and 6) conductivity interface.
D. PUMP
The pump on Models
TFH-18, -24, and -30
is self-priming and has a cast brass impeller, motor bracket, and volute
with stainless steel fasteners to resist corrosion. The drip-proof, cool running, mechanical seal virtually eliminates
burnout and provides easy access for replacement. The pump on Models
TFH-36
is flooded suction and has
machined cast iron volute, bronze fittings.
E. MOTOR
The totally enclosed motor with its external fan-cooled construction allows for operation in noncombustible, dusty,
dirty atmospheres. It is double shielded with prelubricated ball bearings on both ends, a high tensile steel shaft,
enclosed in a heavy gauge rolled steel case and is rated at a service factor of 1.15 at 40˚ C over ambient. Motors
are UL approved and CSA stamped.
F. STRAINER
The pump suction strainer assembly on Models
TFH-18, -24, and -30
has a cast brass body, brass lid, and a cyco-
lac strainer basket. The lid is held in place by two brass lockhandles and includes and o-ring for postive seal.
The pump suction strainer on Model
TFH-36
has a cast iron body; stainless steel basket; cast iron cover with gasket,
held in place with a yoke and bolt clamp.
G. MEDIA
Filter media is shipped with the unit for field installation. The filter media is quartzite or silica with a relative size of
.45 to .55 mm. Clean filter media will remove particles 20 microns in size and larger. Accumulated material on the
top of the media bed, called a filter cake, contributes to finer particle removal as the filter becomes “dirtier”. Removal
of over 99% of 10 micron particles and 90% of 5 micron particles can be expected over the course of a filter cycle.
