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For Commercial Applications
ES-WQ-PWS15T
Job Name
Job Location
Engineer
Approval
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Contractor
Approval
Contractor’s P.O. No.
Representative
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PURE WATER
Series PWS15T
Commercial Water Softening
Systems
Connection Size: 11/2" (40 mm)
Flow Rates: Up to 55 gpm (208 lpm)
Watts Pure Water Series PWS15T water softening systems are
highly efficient, twin alternating, conventional cation exchange
type water softeners. They are designed to supply continuous
softened water without interruption.
Series PWS15T water softeners are suitable for commercial
applications ranging from 60,000 to 300,000 grains of hardness
removal per tank and flow rates up to 55 gallons per minute
(208 lpm). Regeneration is meter demand initiated. All cycles
of regeneration are fully automatic and do not require manual
actuation.
Watts Pure Water Series PWS15T water softeners are designed
for point of use or point of entry applications where the benefits
of softened water are required and water demand is round the
clock. These systems exchange scale-forming calcium and
magnesium ions with non scale-forming sodium ions to create
soft water for a variety of applications.
Steam boiler make up water, water heater pretreatment, reverse
osmosis pretreatment, cooling tower make up water, sterilizer
make up water, washing, and process water are all common
applications for the Watts Pure Water Series PWS15T water
softeners.
Softened water provides a wide variety of benefits from not
introducing scale into pipes, valves, water heating equipment,
heat exchangers, and cooling towers to reducing mineral build
up in areas that see excessive splashing such as food preparation counters and sink areas. Softened water also conserves
soaps and cleaning agents by eliminating the formation of soap
curd, so your cleaners can work on cleaning – not reacting with
the hardness in your water.
Features
• Twin alternating design for continuous softened water
• WQA Certified fully automatic metered demand control valve
• Sophisticated digital electronic controls that store operating
history that can be accessed by the user
• Fully adjustable regeneration cycles
• Durable brass bodied control valve for years of service
• Dry contact lock out switch for remote interface is standard
• WQA Certified high capacity resin
• Highly corrosion resistant NSF Certified fiberglass tanks
• Durable polypropylene lower distribution system
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Standards
Control Valve- WQA Certified to NSF/ANSI Std. 61
Ion Exchange Resin- WQA Certified to NSF/ANSI Std. 44
Mineral Tank- NSF Certified to ANSI Std. 44 or 61
Specifications
Watts Pure Water Series PWS15T water softening system shall
be installed on the building’s main water line just after it enters
the building. The installation point shall be after any backflow
prevention or pressure regulating valves. Other installation
options are to install a system just before the water heater or
other types of equipment needing the protection of softened
water. In installations where dedicated cold water make up to a
water heater is the installation point, a backflow preventer and
a thermal expansion tank must be installed as well. The system
shall be installed with a bypass valve to allow for the shut down
and removal of the unit without interrupting the water supply to
the building.
The water softener shall be a down flow regenerated, metered
demand, sodium cycle cation exchange type system with all
components necessary for proper operation. Electrical requirements are 120 volt 60 hertz. A local drain is required to accept
drain water from the system. The feed water pressure must not
fall below 25psi or exceed 125psi. Water temperature must not
fall below 34°F or exceed 110°F (1° - 43°C).
The system shall provide softened water measuring less than
one grain per gallon of hardness as Calcium Carbonate when
operated within the manufacturers operational specifications.
Series PWS15T Twin Alternating
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Feed Water Guidelines
pH .................... 6 to 10
Hardness (maximum) ...... Depends on customers acceptable
hardness leakage level.
Water Pressure .......... 25psi to 125psi (171 kPa to 8.5
bar)
Temperature ............ 34 - 110°F (1 - 43°C)
Free Chlorine (maximum) ... 1mg/L
Iron (maximum) .......... 1mg/L
Oil and H2S ............. None Allowed
Turbidity Less than 5.0 NTU
For all other guideline information please contact your Watts
representative.
Dimensions - Weights
Note: Do not use with water that is microbiologically unsafe or
of unknown quality without adequate disinfection before or after
the system.
E
E D
F
F
C
C
BACK
BACK SIDE
MODEL NO. DIMENSIONS WEIGHTS
A B C D E F G
in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs kgs
A B
A
G
G
D
B
SIDE
PWS15T171C21 555/8 1413 555/8 1413 607/8 1546 141/4 362 4815/16 1242 24 607 41 1041 370 168
PWS15T171D21 67
PWS15T171E21 67
PWS15T171F21 68
PWS15T171G21 70
PWS15T171H21 77
5
/8 1718 675/8 1718 7215/16 1852 151/4 387 50 1270 24 607 41 1041 550 250
1
/8 1705 671/8 1705 723/8 1838 161/4 413 503/4 1289 24 607 41 1041 720 327
15
/16 1750 6815/16 1750 74 1880 181/8 460 513/4 1314 24 607 41 1041 900 409
15
/16 1801 7015/16 1801 76 1930 211/8 536 531/4 1353 24 607 50 1270 1215 552
1
/8 1959 771/8 1959 823/8 2092 241/8 613 543/4 1391 30 762 50 1270 1750 795
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Specifications
MINERAL TANK BRINE TANK SOFTENING LBS. SALT PER FLOW RATE & PRESSURE
TANK RESIN GRAVEL TANK SALT CAPACITY REGENERATION SERV DROP BKW
MODEL NO. SIZE Ft
3
SIZE FILL MAX MIN MAX MIN GPM PSI GPM
PWS15T171C21 12" x 52" 2.0 30 lbs. 24" x 41" 600 60 K 40 K 30 12 15/20 15/25 5.0
PWS15T171D21 14" x 65" 3.0 60 lbs. 24" x 41" 600 90 K 60 K 45 18 17/22 15/25 7.0
PWS15T171E21 16" x 65" 4.0 80 lbs. 24" x 41" 600 120 K 80 K 60 24 25/40 15/25 9.0
PWS15T171F21 18" x 65" 5.0 100 lbs. 24" x 41" 600 150 K 100 K 75 30 30/50 15/25 12.0
PWS15T171G21 21" x 62" 7.0 100 lbs. 24" x 50" 800 210 K 140 K 105 42 35/53 15/25 15.0
PWS15T171H21 24" x 72" 10.0 200 lbs. 30" x 50" 1200 300 K 200 K 150 60 40/55 15/25 15.0
Ordering Information
SPACE
MODEL NO. DESCRIPTION PIPE SIZE REQUIRED WEIGHT
W x D x H LBS KGS
PWS15T171C21 2 Cubic Foot Twin Alt. Water Softener with Flow Meter 11⁄2" 24" x 42" x 75" 370 168
PWS15T171D21 3 Cubic Foot Twin Alt. Water Softener with Flow Meter 1
PWS15T171E21 4 Cubic Foot Twin Alt. Water Softener with Flow Meter 1
PWS15T171F21 5 Cubic Foot Twin Alt. Water Softener with Flow Meter 1
PWS15T171G21 7 Cubic Foot Twin Alt. Water Softener with Flow Meter 1
PWS15T171H21 10 Cubic Foot Twin Alt. Water Softener with Flow Meter 1
1
⁄2" 24" x 44" x 87" 550 250
1
⁄2" 24" x 46" x 87" 720 327
1
⁄2" 24" x 50" x 89" 900 409
1
⁄2" 24" x 52" x 89" 1215 552
1
⁄2" 39" x 69" x 96" 1750 795
Notes: Capacities are based on resin manufacturer’s data and are dependent upon influent water TDS, temperature, bed depth, and
flow rates. Feed water must be free of oil and color. Pipe size, tank size, and space requirements are in inches. Capacities and flow
rates expressed above are per tank. Flow rates listed at 25 psi drops are for intermittent peak flow rates and are not to be used as
continuous flows.
Note: This information is not intended to replace the product
installation and safety information available or the experience of
a trained product installer. Please refer to the product installation and safety instructions for further information.
A Watts Water Technologies Company
ES-WQ-PWS15T 1136 © 2011 Watts
USA: North Andover, MA • Tel. (800) 224-1299 • www.watts.com
Canada: Burlington, ON • Tel. (888) 208-8927 • www.wattscanada.ca
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