Watts PWS20-2 - Manual

For Commercial Applications
ES-WQ-PWS20_S20-2
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Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative ––––––––––––––––––––––––––––––––––––––––
Series PWS20-2 Series PWS20
Series PWS20 and
Series PWS20-2
Commercial Water Softening
Systems
Connection Size: 2" (50mm)
Flow Rates: Up to 105 gpm (397 lpm)
Watts Pure Water Series PWS20 and PWS20-2 water softening
systems are highly efficient conventional cation exchange type
water softeners. They are suitable for commercial applications
ranging from 90,000 to 600,000 grains of hardness removal
per tank and flow rates up to 105 gallons per minute (397 lpm).
Where continuous softened water is required PWS20-2 duplex
alternating systems can be specified for uninterrupted service.
Regeneration is meter demand initiated. All cycles of regenera-
tion are fully automatic and do not require manual actuation.
Watts Pure Water Series PWS20 and PWS20-2 water soften-
ers are designed for point of use or point of entry applications
where the benefits of softened water are required. These sys-
tems 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 PWS20
and PWS20-2 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 prepara-
tion 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.
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 with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
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
Specifications
A Watts Pure Water Series PWS20 and PWS20-2 water soft-
ening 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 with-
out 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 require-
ments 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°C - 43°C).
The system shall provide softened water measuring less than
one grain per gallon of hardness as Calcium Carbonate when
operated within the manufacturer’s operational specifications.
PURE WATER