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For Commercial Applications
ES-WQ-PWS15
Job Name
Job Location
Engineer
Approval
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Series PWS15
Commercial Water Softening
Systems
Connection Size: 11/2" (40 mm)
Flow Rates: Up to 55 gpm (208 lpm)
Watts Pure Water Series PWS15 water softening systems are
highly efficient conventional cation exchange type water softeners. They are suitable for commercial applications ranging from
60,000 to 300,000 grains of hardness removal and flow rates
up to 55 gallons per minute. Regeneration is meter demand initiated. All cycles of regeneration are fully automatic and do not
require manual actuation.
Watts Pure Water Series PWS15 water softeners are designed
for point of use or point of entry applications where the benefits
of softened water are required. 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, sterilizer make up water, washing, and process water are all common applications for the
Watts Pure Water Series PWS15 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
• 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
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
Contractor
Approval
Contractor’s P.O. No.
Representative
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PURE WATER
Series PWS15
Specifications
A Watts Pure Water Series PWS15 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 instal-
lation 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.
Note: Do not use with water that is microbiologically unsafe or
of unknown quality without adequate disinfection before or after
the 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.
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Dimensions - Weights Feed Water Guidelines
E
E
F
F
C
C
G
G
FRONT
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 in. mm
B
B
D
D
SIDE
PWS15121C11 547/8 1394 553/4 1416 61 1549 1315/16 353 19 483 18 457 40 1016 210 95
15
PWS15121D11 66
PWS15121E11 66
PWS15121F11 68 1727 69 1753 74
PWS15121G11 70 1778 71 1803 76
PWS15121H11 76
/16 1699 677/8 1724 733/8 1864 1415/16 378 1913/16 503 18 457 40 1016 240 109
3
/8 1686 671/4 1708 723/4 1848 1515/16 405 2013/16 528 18 457 40 1016 320 145
3
/8 1940 771/4 1962 823/4 2102 241/8 613 2413/16 630 30 762 50 1270 710 323
7
/16 1890 181/8 460 2113/16 554 24 610 41 1041 380 173
7
/16 1941 211/8 536 235/16 592 24 610 50 1270 585 266
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
A
A
For all other guideline information please contact your Watts
representative.
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.
Specifications
MINERAL TANK BRINE TANK SOFTENING LBS. SALT PER FLOW RATE & PRESSURE
MODEL NO. SIZE Ft
TANK RESIN GRAVEL TANK SALT CAPACITY REGENERATION SERV DROP BKW
3
SIZE FILL MAX MIN MAX MIN GPM PSI GPM
PWS15121C11 12" x 52" 2.0 30 lbs. 18x40 400 60 K 40 K 30 12 15/20 15/25 4.0
PWS15121D11 14" x 65" 3.0 60 lbs. 18x40 400 90 K 60 K 45 18 17/22 15/25 5.0
PWS15121E11 16" x 65" 4.0 80 lbs. 18x40 400 120 K 80 K 60 24 25/40 15/25 7.0
PWS15121F11 18" x 65" 5.0 100 lbs. 24x41 600 150 K 100 K 75 30 30/50 15/25 11.0
PWS15121G11 21" x 62" 7.0 100 lbs. 24x50 800 210 K 140 K 105 42 35/53 15/25 13.0
PWS15121H11 24" x 72" 10.0 200 lbs. 30x50 1400 300 K 200 K 150 60 40/55 15/25 15.0
Ordering Information
MODEL NO. DESCRIPTION PIPE SIZE REQUIRED WEIGHT
PWS15121C11 2 Cubic Foot Simplex Softener with Flow Meter 1.5" 24" x 42" x 75" 210 95
PWS15121D11 3 Cubic Foot Simplex Softener with Flow Meter 1.5" 24" x 44" x 87" 240 109
PWS15121E11 4 Cubic Foot Simplex Softener with Flow Meter 1.5" 24" x 46" x 87" 320 145
PWS15121F11 5 Cubic Foot Simplex Softener with Flow Meter 1.5" 24" x 50" x 87" 380 173
PWS15121G11 7 Cubic Foot Simplex Softener with Flow Meter 1.5" 24" x 52" x 84" 585 266
PWS15121H11 10 Cubic Foot Simplex Softener with Flow Meter 1.5" 39" x 69" x 96" 710 323
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. Flow rates
listed at 25 psi drops are for intermittent peak flow rates and are not to be used as continuous flows.
SPACE
W x D x H LBS KGS
A Watts Water Technologies Company
ES-WQ-PWS15 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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