Sta-Rite S7S50 Installation Manual
SYSTEM 3
®
HIGH RATE SAND FILTERS
O W N E R’ S M A N U A L
INSTALLATION, OPERATION & PARTS
MODELS
S7S50 S8S70
This manual should be furnished to
the end user of this filter; its use will
reduce service calls and chance of
injury and will lengthen filter life.
Pentair Water Pool and Spa, Inc.
© 2007 Pentair Water Pool and Spa, Inc. All rights reserved. This document is subject to change without notice.
1620 Hawkins Ave., Sanford, NC 27330 • (919) 566-8000
10951 West Los Angeles Ave., Moorpark, CA 93021 • (805) 553-5000
Trademarks and Disclaimers:
System 3
®
, Sta-Rite®and Pentair Water Pool and Spa®are trademarks and/or registered trademarks of Pentair Water Pool
and Spa, Inc. and/or its affiliated companies in the United States and/or other counties. Unless noted, names and brands of
others that may be used in this document are not used to indicate an affiliation or endorsement between the proprietors of
these names and brands and Pentair Water Pool and Spa, Inc. Those names and brands may be the trademarks or registered trademarks of those parties or others.
Printed in U.S.A.
November 1, 2007 S282 (Rev. A)
Protected by one or more of the following U.S. Patents and all corresponding foreign counterparts: U.S. Pat. No. 4,995,523, 5,190,651, 5,753,071 and 6,036,853
2
HIGH RATE SAND FILTERS
To avoid unneeded service calls, prevent possible injuries, and get the most
out of your filter, READ THIS MANUAL CAREFULLY!
The Sta-Rite System 3 High Rate Sand Filter:
• Is designed to filter water for swimming pools.
• Is an excellent performer; durable, reliable.
Table of Contents
Safety Instructions..................................................................................2-3
General Information/Specifications............................................................4
Installation.................................................................................................5
Initial Filling ...............................................................................................6
Filter Disassembly/Assembly .................................................................6-7
Startup/Operation .....................................................................................7
Backwash..................................................................................................8
Maintenance ..........................................................................................8-9
Replace Internal Assembly........................................................................9
Winterizing ................................................................................................9
Repair Parts List.................................................................................10-11
Troubleshooting Guide ............................................................................12
READ AND FOLLOW SAFETY INSTRUCTIONS!
This is the safety-alert symbol. When you see this symbol on your valve or in
this manual, look for one of the following signal words and be alert to the potential for personal injury.
DANGER warns about hazards that will cause serious personal injury, death
or major property damage if ignored.
WARNING warns about hazards that can cause serious personal injury,
death or major property damage if ignored.
CAUTION warns about hazards that will or can cause minor personal injury
or property damage if ignored.
The label NOTICE indicates special instructions which are important but not
related to hazards.
Carefully read and follow all safety instructions in this manual and on filter.
Keep safety labels in good condition.
Replace missing or damaged safety labels.
3
Incorrectly installed or tested equipment may fail, causing severe injury or property damage. Read and follow instructions
in owner's manual when installing and operating equipment.
Have a trained pool professional perform all pressure tests.
1. Do not connect system to a high pressure or city water system.
2. Use equipment only in a pool or spa installation.
3. Trapped air in system can cause explosion. BE SURE all air is out of
system before operating or testing equipment.
Before pressure testing, make the following safety checks:
• Check all clamps, bolts, lids, and system accessories before testing.
• Release all air in system before testing.
• Tighten Sta-Rite pump trap lids to 30 ft. lbs. (4.1 kg-cm) torque for testing.
• Water pressure for test must be less than 25 PSI (172 kPa).
• Water temperature for test must be less than 100˚ F. (38˚ C).
• Limit test to 24 hours. After test, visually check system to be sure it is
ready for operation. Remove pump trap lid and retighten hand tight only.
NOTICE: These parameters apply to Sta-Rite equipment only. For non
Sta-Rite equipment, consult manufacturer.
If filter clamp is
adjusted under pressure, tank will blow
off of base, causing
severe injury or major
property damage.
BEFORE WORKING
ON FILTER:
1. Stop pump.
2. Open air release
valve.
3. Release all pressure
from system.
Filter pumps require
hazardous voltage
which can shock,
burn, or cause death
BEFORE WORKING
ON PUMP OR MOTOR
Disconnect power to
motor.
4
GENERAL INFORMATION
• Clean a new pool as well as possible before filling pool and operating filter. Excess dirt and large particles of foreign matter in the system can
cause serious damage to the filter and pump.
Do not operate filter at water temperatures above 120°F (65.5°C).
NEVER operate this filter system at more than 50 pounds per square
inch (50 PSI/345kPa) pressure!
TABLE I - OUTLINE DIMENSIONS IN INCHES (mm)
Sand A B C D E F
Model No. of Clamps
S7S50 28-1/2(724) 42(1067) 7 36(914) 53-1/2(1360) 2” NPT
S8S70 32-1/2(825) 42-1/4(1073) 8 40(1020) 54-1/4(1380) 2” NPT
TABLE ll - FILTER SPECIFICATIONS AND OPERATING INFORMATION
FILTER MODEL: S7S50 S8S70
Filter Area 2.4 Ft.2(.223M2) 3.4 Ft.2(.316M2)
Flow Rate Range 33-48 GPM(125-182 L/m) 47-68 GPM(178-257 L/m)
Public Pool Flow Rate 48 GPM(182 L/m) 68 GPM(257 L/m)
Max. Operating Pressure 50 PSI(345 kPa) 50 PSI(345 kPa)
Freeboard (See Fig. 1B)* 11” (28 cm) 11” (28 cm)
Turnover in Hours:
6 Hours 17,200 Gal.(65 102 liters) 24,400 Gal.(92 354 liters)
8 Hours 23,000 Gal.(87 055 liters) 32,600 Gal.(123 391 liters)
10 Hours 28,800 Gal.(109 008 liters) 40,800 Gal.(154 428 liters)
Qty. of Media Required:
Cu. Ft. 2(56 540cm
3
) 3(84 960cm3)
Weight (Pounds) 200(90,7 kg) 300(136 kg)
* Freeboard is the open space between the top of the sand bed and the tank backwash outlet.
NOTICE: 1 cubic foot (28 320 cm
3
) of sand weighs approximately 100 lbs. (45,4kg). DO NOT
use a finer grade of sand than recommended.
RECOMMENDED SAND GRADES:
Use only: #20 Silica Sand, Size Range .40-.55mm., Uniformity Coefficient
less than 1.75.
NOTICE: Use of other sands will reduce filter performance, may damage
pump,and will void warranty.
Recommended:
1. Wedron Silica/Best Sand Co., Sand Grade: Wedron .45-.55mm.,
Effective Size .46mm, Uniformity Coefficient 1.22.
2. U.S. Silica - Silurian Filter Sand, Sand Grade.45-.55 mm., Effective Size
.48mm, Uniformity Coefficient 1.18.
Hazardous pressure.
Can cause severe
injury or major
property damage
from tank blow up.
Release all pressure
and read instructions
before working on filter.
A
B
C
D
E
INLET
OUTLET
7.812"
19.85 cm
9.19"
23.3 cm
F
SAND BED
11"
TANK
FLANGE
DISTRIBUTOR
11" (28 cm)
FREE BOARD
12.5"
31.75 cm
Figure 1 - Dimensions
Figure 2 - Freeboard measurement
0
10
20
30
40
50
60
70 80
0
1.0
2.0
3.0
4.0
Gallons Per Minute
P
ressure
D
rop
(PSI)
5.0
6.0
14.0
2.0
4.0
6.0
8.0
10.0
12.0
Pressure Drop (Feet)
S8S70S7S50
015 0893
5
INSTALLATION
Installation of filter should only be done by qualified, licensed personnel. For assembly and filling instructions, see pages 6 and 7.
Filter mount must:
• Provide weather and freezing protection.
• Provide space and lighting for easy access for routine maintenance. (See Figure I
and Table 1, Page 4, for space requirements.)
• Be on a reasonably level surface and provide adequate drainage.
• Be as close to pool as possible to reduce line loss from pipe friction.
Piping:
• Piping must conform to local/state plumbing and sanitary codes.
• Use pipe joint sealing compound or Teflon tape on all male connections of metal
pipe and fittings (except unions). Use Teflon tape or Plasto-Joint Stik
®
on all male
connections of plastic pipe and fittings. DO NOT use pipe dope on plastic pipe; it
will cause stress cracking of the pipe. Do not use sealant or tape on unions – assemble them dry and hand tight.
• Do not damage union sealing surfaces and O-Rings.
• Support pipe independently to prevent strains on filter or valve.
• Use 2” pipe to reduce pressure losses as much as possible.
NOTICE: Filter may be located away from pool, but for adequate flow larger pipe
may be needed. For more information about hydraulic design, call
Sta-Rite Customer Service.
• Fittings restrict flow; for best efficiency use fewest possible fittings.
• Keep piping tight and free of leaks: pump suction line leaks may cause trapped air
in filter tank or loss of prime at pump; pump discharge line leaks may show up as
dampness or jets of water.
• NOTICE: Overtightening can crack filter ports.
Valves:
• A check valve installed ahead of filter inlet will prevent contaminants from draining
back into pool.
• A check valve installed between filter and heater will prevent hot water from backing up into filter and deforming internal components.
• Install Sta-Rite Two Position Slide Valve or Multiport Selector Valve with filter. See
Table lll.
• Filter ports and valve ports are furnished with union connections.
DO NOT use pipe sealants on union collar (nut).
• Use care before assembly not to damage union sealing surfaces or O-Ring.
Wastewater:
• Be sure all provisions for waste water disposal meet applicable local, state or national codes. 100 gallons (379 liters) or more of pool water will be discharged during filter backwashing. Do not discharge where water will cause flooding or
damage.
Assembly:
See Pages 6 and 7 for assembly filling instructions.
Port Part
Size Number
Multi-port
2" 18202-0200
1-1/2" 18202-0150
Brass Slide
2" WC212-136D
Plastic Slide
2" WC212-134P
TABLE III - Sta-Rite valves
for use with filters
NOTICE: Use of
valves other than
those listed above
could cause reversed water flow
through filters and
damage to internal filter components.
Plasto-Joint Stik® is a registered trademark of La-Co Industries, Inc.
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