Sta-Rite THS 4272 Installation Manual

PENTAIR POOL PRODUCTS

THS SERIES FILTER

BUTTERFLY VALVE STYLE

FACE PIPING INSTALLATION

INSTRUCTIONS

This manual covers installation and operating instructions for the optional butterfly valve style
face piping kits for use with the THS series filter vessels.

WARNING: This manual contains critical safety information that must be furnished to the end
user. Failure to read and follow the instructions could result in serious personal injury and/or
major property damage.

Pentair Pool Products

1620 Hawkins Ave.

Sanford, NC 27330
Phone: [phone]
Fax: [phone]

TABLE OF CONTENTS

1.0 PRINCIPALS OF OPERATION 2

1.1 SINGLE TANK NORMAL OPERATION 2

1.2 SINGLE TANK DURING BACKWASH 2

1.3 DUAL TANK NORMAL OPERATION 3

1.4 DUAL TANK DURING BACKWASH 3

2.0 FACE PIPING INSTALLATION 3

2.1 SINGLE TANK FACE PIPING INSTALLATION – THS 3461 (4”- GROOVED TANK
CONNECTIONS) 4

2.2 SINGLE TANK FACE PIPING INSTALLATION – THS 3484, THS 4272, THS 4284 AND THS
4296 (6” FLANGE TANK CONNECTIONS) 8

2.3 DUAL TANK FACE PIPING INSTALLATION -THS 3461 (4”- GROOVED TANK
CONNECTIONS) 11

2.4 DUAL TANK FACE PIPING INSTALLATION – THS 3484, THS 4272, THS 4284 AND THS
4296 (6” FLANGE TANK CONNECTIONS) 15

2.5 INFLUENT/EFFLUENT GAUGE PANEL INSTALLATION 19

3.0 OPERATION INSTRUCTIONS 20

3.1 NORMAL FILTRATION MODE 21

3.2 SWITCHING SYSTEM TO BACKWASH MODE 22

3.2.1 Single Tank System With Influent Piping on Right of Tank 22

3.2.2 Single Tank System With Influent Piping on Left of Tank 23

3.2.3 Dual Tank System With Influent Piping on Right of Tank 24

3.2.4 Dual Tank System With Influent Piping on Left of Tank

25

APPENDIX 26
APPENDIX A 27

APPENDIX B 28

Butterfly Valve Face Piping Kit Installation Manual Pg. 1 of 28
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Thank you for purchasing the butterfly valve style face piping kit for your THS series filter
vessel. This kit includes features such as pre-glued subassemblies for ease of assembly and
simple operation of valves for switching to backwash mode.

This manual covers the installation and operation of face piping kits for both one and two
tank filter systems. This manual also includes a trouble-shooting guide to assist with some
typical problems which may occur during operation. If you should have any questions pertaining
to the filter tank itself, please refer to the separate manual provided for the tanks.

Please remember to use proper safety equipment and techniques when installing this
filtration system.

1.0 Principals of Operation

This section will familiarize you with how the face piping kit and valves work in order to
provide a means of backwashing the filter. It will cover the flow of water in a single tank system in
normal filtration and backwash modes, and a dual tank system in normal filtration and backwash
modes. Please note that the gray arrows represent influent water flow and white arrows

represent effluent/waste water flow.

1.1 Single Tank Normal Operation

During normal filtration mode, water is
passed through the influent piping and into
the tank. Water is then passed through the
sand, where the filtration process occurs. It is
then passed through the collection laterals at
the bottom of the tank. It then passes out of
the effluent pipe and continues through the
rest of the system.

1.2 Single Tank During Backwash

During backwash mode, the butterfly valves are
actuated so that a backwash cycle can be run.
Since water cannot enter the tank through the
influent piping, it enters through the effluent
piping. The water is pushed up through the sand
bed, which causes the sand bed to fluidize. This
loosens dirt and debris trapped by the sand.
This debris is then passed through the influent
piping and exits through a waste pipe.

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1.3 Dual Tank Normal Operation

During normal operation in a dual tank
system, water is split between the two
tanks. It passes through the influent piping
and then through the sand beds. It is then
passed through the collection laterals at
the bottom of the tanks and passed out of
the effluent piping and returned to the pool.

1.4 Dual Tank During Backwash

During backwash mode in a dual tank
system, the butterfly valves are actuated
so that a backwash cycle can be run.
Since water cannot enter the tanks
through the influent piping, it enters
through the effluent piping. The water is
pushed up through the sand beds, which
is called “Fluidizing” the sand beds. This
loosens dirt and debris trapped by the
sand. This debris is then passed through
the influent piping and exits through a
waste pipe. On a dual tank system, both
tanks backwash simultaneously.

2.0 Face Piping Installation

IMPORTANT: Installation of the face piping should occur after the filter vessels have been
positioned in their permanent location. Please refer to the Tank Owner’s/Operator’s
Manual section on locating the filter vessels. For dual tank systems, it is very important
that the “C-C” dimension listed in Figure 1 on page 5 of that manual is followed. Please
refer to the Tank Owner/Operators Manual for more information.

Butterfly valve face piping kits come in either one or two tank kits. The piping kits come
with pre-glued subassemblies. This means that some sections of the kit will require gluing by the
installer. For single tank systems there will be 2 glue joints required, dual tank systems will
require 8 glue joints. All other connections that need to be made are flanged or grooved coupli ng
connections between mating sections. Please refer to the appropriate drawings in the Appendix
section at the end of this manual for aid in assembly.

IMPORTANT: When tightening flange bolts, it is important to follow a diametrically
opposed pattern. This will ensure that a proper seal between the flanges is obtained.
Refer to Figure 1 (next page) for proper tightening sequence. Torque all bolts to a

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maximum of 40 ft-lbs. Also, it may be beneficial to apply a teflon based lubricant to each
bolt or nut to help relieve stress due to friction.

2.1 Single Tank Face Piping Installation – THS 3461 (4”- Grooved Tank

Connections)

The single tank face piping kit consists of:
(4) Butterfly valves (1) Set of Mounting Brackets and Hardware

(1) Subassembly “A” (32) Zinc plated nuts
(1) Subassembly “B1” (2) 4” Groove Coupling Assembly
(1) Subassembly “B2” (32) 6” Zinc plated bolts
(1) Subassembly “C” (64) Zinc plated washers
(1) 90° Elbow Fitting (32) Lock washers
(2) Socket flange (2) 3/8” OD x ¼” MNPT quick connect fitting
(1) Gauge panel assembly 3/8” OD tubing (not shown)

Prior to installation see “Grooved Coupling Assembly instruction” found on page 5.

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Grooved Coupling Assembly Instruction

1) Seat rubber gasket over end of pipe 1, making sure that the gasket does not cover the

groove cut in the pipe.

2) Insert end of pipe 2 into rubber gasket, again making sure that the gasket does not cover the

groove in the pipe.

3) Fit coupling halves over rubber gasket making sure that coupling halves are seated into the

grooves of the (2) pipes. Make sure one coupling half has standard thru bolt holes and the
other has hexagonal counter-bored thru bolt holes.

Apply an anti-seize lubricant to the threads of the coupling bolts. Insert bolts into the holes in th e coupling,
making sure that the bolt heads fit inside the hexagonal counter-bored holes on one side of the coupling.
Place one washer and nut on each bolt and tighten.

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STEP 1: Influent Subassembly Installation
With gasket of Groove coupling assembly installed on influent

tank grooved pipe connection, Place Subassembly “C” on to
pipe connection, install groove coupling assembly. See
picture at right for proper orientation. Snug the nuts to “hand
tight”, but do not fully tighten. This will allow for adjustments
during the remainder of the installation.

STEP 2: Effluent piping installation
With gasket of Groove coupling assembly installed on effluent tank

pipe connection, Place Subassembly “B1” on to pipe connection,
install groove coupling assembly. See picture at right for proper
orientation. Snug the nuts to “hand tight”, but do not fully tighten.
This will allow for adjustments during the remainder of the
installation.

Place 90° elbow on top of effluent pipe, but DO NOT GLUE. Next
place Subassembly “B2” into elbow, again DO NOT GLUE. Level
the front faces of both tees on the influent and effluent assemblies.
Also ensure that the tee on the effluent piping is level horizontally.
Next, verify that the vertical dimension between the centerlines of
both tees is 17 ¼”. In some cases adjustments or trimming of pipes
may be needed. Once the piping is in its correct position, mark all
of the piping as needed for trimming and gluing. Remove all
components of the effluent assembly from the tank. Make any
necessary trims at this time if needed. Glue all of the pieces
together making sure to align all marks made previously. Use
PVC cement for use with schedule 80 pipe. Please follow the
cement manufacturer’s directions. Once assembly is glued and
allowed ample time to cure, refit the effluent assembly on to the
tank. Re-Install groove coupling assembly on the effluent flange.
Snug the nuts to “hand tight”, but do not fully tighten. This will
allow for adjustments during the remainder of the installation.

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STEP 3: Influent Extension Installation

Install valves on the two flanges on the side of the tank
that the influent piping will be coming from. Orient them
so that when the valves are in the closed position, the
handles are pointing down towards the ground. This
means that the valve handles will rotate counter
clockwise to open. Install the Subassembly “A” on to
the appropriate side of the tank, depending on where
the influent piping is coming from. It may be necessary
to rotate the influent and effluent subassemblies slightly
to properly align Subassembly “A”. Install the 6” zinc
plated bolts, washers, and lock washers on to the two
flanges. Snug the nuts to “hand tight”, but do not fully
tighten.

STEP 4: Effluent/Waste Flange Installation

On the remaining two flanges install the remaining two
valves. Again, orient them so that when the valves are in
the closed position, the handles are pointing down
towards the ground. The means that all of the valve
handles will rotate counter clockwise to open. Install the
socket flanges provided on to each valve. Install the 6”
zinc plated bolts, washers, and lock washers on to the
two flanges. Snug the nuts to “hand tight”, but do not fully
tighten.

STEP 5: Final Adjustments
Once all piping is in place, make necessary adjustments and fully tighten all flange bolts and

groove coupling assemblies. For flange connection be sure to follow the tightening pattern
explained at the beginning of Section 2.0. Tighten all bolts to a maximum of 40 ft-lbs.

Note: All piping should be fully supported with adequate bracing and hangers to
prevent damage from weight and vibration.

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2.2 Single Tank Face Piping Installation – THS 3484, THS 4272, THS 4284
and THS 4296 (6” Flange Tank Connections)

The single tank face piping kit consists of:
(4) Butterfly valves (1) Set of Mounting Brackets and Hardware

(1) Subassembly “A” (48) zinc plated nuts
(1) Subassembly “B1” (16) 4” zinc plated bolts
(1) Subassembly “B2” (32) 7” zinc plated bolts
(1) Subassembly “C” (96) zinc plated washers
(2) 90° Elbow Fitting (48) lockwashers
(3) Flange gaskets (2) 3/8” OD x ¼” MNPT quick connect fitting
(2) Socket flange 3/8” OD tubing (not shown)
(1) Gauge panel assembly

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STEP 1: Influent Subassembly Installation
Place a flange gasket on the influent tank

flange. Align the holes in the gasket with the
holes of the flange ring on the tank. Place
Subassembly “C” on to flange, making sure to
align the bolt holes on the tank flange and the
subassembly. See picture at right for proper
orientation. Install 4” zinc plated bolts, nuts,
washers, and lockwashers on the influent
flange. Snug the nuts to “hand tight”, but do
not fully tighten. This will allow for adjustments
during the remainder of the installation.

STEP 2: Effluent piping installation
Place a flange gasket on the effluent tank flange.

Align the holes in the gasket with the holes of the
flange ring on the tank. Place subassembly “B1” on
to the effluent tank flange, making sure to align the
bolt holes of the tank flange and the subassembly.
Install 4” zinc plated bolts, nuts, washers, and
lockwashers on the efffluent flange. Snug the nuts to
“hand tight”, but do not fully tighten.

Place 90° elbow on top of effluent pipe, but DO
NOT GLUE. Next place Subassembly “B2” into
elbow, again DO NOT GLUE. Level the front faces
of both tees on the influent and effluent assemblies.
Also ensure that the tee on the effluent piping is
level horizontally. Next, verify that the vertical
dimension between the centerlines of both tees is
19 ¾”. In some cases adjustments or trimming of
pipes may be needed. Once the piping is in its
correct position, mark all of the piping as needed

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for trimming and gluing. Remove all components of the effluent assembly from the tank. Make
any necessary trims at this time if needed. Glue all of the pieces together making sure to align all
marks made previously. Use PVC cement for use with schedule 80 pipe. Please follow the
cement manufacturer’s directions. Once assembly is glued and allowed ample time to cure, refit
the effluent assembly on to the tank. Make sure that the flange gasket is placed back between
the flange connection on the effluent pipe from the tank. Re-Install zinc plated hardware on the
effluent flange. Snug the nuts to “hand tight”, but do not fully tighten. This will allow for
adjustments during the remainder of the installation.

STEP 3: Influent Extension Installation
Install valves on the two flanges on the side of the tank that the

influent piping will be coming from. Orient them so that when the
valves are in the closed position, the handles are pointing down
towards the ground. This means that the valve handles will rotate
counter clockwise to open. Install the Subassembly “A” on to the
appropriate side of the tank, depending on where the influent
piping is coming from. It may be necessary to rotate the influent
and effluent subassemblies slightly to properly align Subassembly
“A”. Install the 7” zinc plated bolts, washers, and lock washers
on to the two flanges. Snug the nuts to “hand tight”, but do not
fully tighten.

STEP 4: Effluent/Waste Flange Installation
On the remaining two flanges install the remaining two valves.

Again, orient them so that when the valves are in the closed
position, the handles are pointing down towards the ground.
The means that all of the valve handles will rotate counter
clockwise to open. Install the socket flanges provided on to
each valve. Install the 7” zinc plated bolts, washers, and lock
washers on to the two flanges. Snug the nuts to “hand tight”,
but do not fully tighten.

STEP 5: Final Adjustments
Once all piping is in place, make necessary adjustments and

fully tighten all flange bolts. Be sure to follow the tightening
pattern explained at the beginning of Section 2.0.
Tighten all bolts to a maximum of 40 ft-lbs.

Note: All piping should be fully supported with
adequate bracing and hangers to prevent damage
from weight and vibration.

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