Watts PWR2511 User Manual

For Commercial Applications

ES-WQ-PWR2511

Job Name

Job Location

Engineer

Approval

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Series PWR2511

Commercial Reverse Osmosis
Systems

Flow Rates: Up to 1,200 gpd (4,542 lpd)

Watts Pure Water Series PWR2511 reverse osmosis (RO)
systems are commercial grade high-pressure RO units for
the reduction of total dissolved solids from water. They are
designed to supply reverse osmosis quality water with pro­duction rates ranging from 150 to 1,200 gallons per day. The
standard units are designed for wall mounting. Where floor
mounting is preferred, the optional floor mounting kit Model
No. PWR2864 can be specified. Reverse osmosis is a process
where high-pressure feed water is fed into a semi-permeable
membrane. In the membrane, pure water is allowed to pass
through the membrane material and exit as purified permeate
water. Dissolved mineral salts are not allowed to pass through
the membrane and become a concentrated reject stream that
is sent to a drain. These RO systems use high-rejection mem­branes to achieve a minimum average NaCl ionic rejection of
95 percent.

Watts Pure Water Series PWR2511 RO systems are a well
designed, rugged line of purifiers. This series comes with a
pre-selected assortment of features for monitoring and opera­tion. Stainless steel membrane housings, inlet and outlet pre­filter pressure gauges, low-pressure switch with delayed auto
restart, permeate pressure switch, adjustable reject recycle,
permeate and reject water flow meters, permeate water check
valve, inlet solenoid valve, membrane feed water pressure
gauge, adjustable reject valve, and membrane auto flush are
all standard features. The standard systems are designed to
feed an atmospheric storage tank or a pressurized bladder
tank. Reverse osmosis water has a wide variety of applica­tions including municipal water treatment, steam boiler and
steam sterilizer make up, laboratory use, spot free rinsing,
ice and beverage water, water for cooking, food processing,
metal plating and finishing, as well as water for humidification.
Reverse osmosis is also the pretreatment of choice for ion
exchange type de-ionization (DI) systems. Using RO water as
make up to a DI system reduces the exhaustion rate of the DI
resin by up to 95 percent saving time, money, and chemicals
associated with DI resin regeneration.

Contractor

Approval

Contractor’s P.O. No.

Representative

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PURE WATER

Series PWR2511

Features

• 304 stainless steel wall mounted support frame

• 316L stainless steel 300psi high-pressure membrane

housings

• Pressure gauges for pre-filter inlet/outlet and membrane
feed pressure

• Low feed water pressure safety switch

• Microprocessor based controller with delayed auto restart

after low pressure shut down

• High-pressure/high-rejection membranes with 95% minimum

average salt rejection

• Permeate and reject water flow meters

• Adjustable reject and reject recycle valves

• Permeate pressure switch and check valve

• Automatic inlet solenoid valve

• Membrane Auto Flush

Standards

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.

• Pre-filter Housing NSF/ANSI Certified 42

• Pre-filter Cartridge NSF/ANSI Certified 42

• Feed water must be pretreated for - Scale prevention
(Softened), dechlorinated (Carbon Filter), and free of

sediment.

Specifications

Watts Pure Water Series PWR2511 reverse osmosis system
shall be installed to provide reverse osmosis quality water. The
RO system shall be installed after a Series PWS water softener
so that scale forming calcium and magnesium hardness cannot
scale the RO membrane(s). Series PWC backwashing carbon
filter shall be installed on the RO feed water line to remove
chlorine and prevent membrane degradation due to chlorine
attack. Series PWM backwashing sediment filter shall also be
installed on the RO feed water line to reduce the silt density
index of the water to prevent particulate fouling of the RO
membrane(s).

The RO system shall be a high-pressure/high-rejection type

unit complete with permeate and reject water flow meters, pre-

filter inlet/outlet and membrane feed water pressure gauges,
316L stainless steel membrane housings, automatic inlet sole-

noid valve, low feed water pressure switch, permeate water
pressure switch, reject and recycle valves, auto flush feature,
micro electronic controller, high-pressure pump, and all other
components necessary for proper operation. The system shall
be a wall mount design with an optional leg kit for floor mount
installations. The RO permeate water shall be collected in an
atmospheric storage tank or a pressurized bladder tank. A per­meate water pressure switch is provided on the RO system for

automatic on/off operation when using a pressurized bladder

tank. 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 20psi. The feed water tem-

perature must not fall below 35°F or exceed 100°F (2 - 38°C).

The system shall produce reverse osmosis quality water with
95 percent minimum average ionic rejection of total dissolved
solids when operated within the manufacturer’s operational
specifications.

Feed Water Guidelines

pH ......................... 6 to 9

Hardness (maximum) ........... Less than 1 grain per gallon as

CaCO3 (Softened) or anti scale

chemical injection if not softened
(contact your Watts representative)

Feed Water Pressure (minimum) ..20psi

Temperature .................35 - 100°F (2 - 38°C)

Free Chlorine (maximum) ........None Allowed

Iron (maximum) ................Less than .1mg/L

Oil and H2S ..................None Allowed

Turbidity ....................Less than 1.0 NTU

Silt Density Index ..............Less than 5.0 SDI

Dimensions - Weights

C

FRONT

MODEl NO. DIMENSIONS WEIghTS

A B C

in. mm in. mm in. mm lbs. kgs.

PWR25111011 9 229 30 762 21 533 50 23
PWR25112011 9 229 32 813 21 533 50 23
PWR25113011 9 229 51 1295 21 533 60 27
PWR25113021 9 229 51 1295 21 533 70 32

A

SIDE

B

Notes:

For all other guideline information please contact your Watts
representative.

Performance

Maximum Productivity (gallons per day) 150 250 600 1200
Quality (average membrane rejection) 98 % 98 % 98 % 98 %
Recovery (user adjustable) 15 - 75 % 15 – 75% 15 - 75 % 25 - 75 %

Membrane Size 2.5” x 14” 2.5” x 21” 2.5” x 40” 2.5” x 40”
Number Of Membranes 1 1 1 2
Prefilter (system ships with one 5 micron cartridge) 10"
Feed Water Connection ½" NPT

Product Water Connection (tubing OD)
Reject Water Connection (tubing OD)
Feed Water Required (maximum) 2.4 gpm
Feed Water Pressure (minimum) 20psi
Drain Required (maximum) 2.4 gpm

Electrical Requirement 120 VAC 60 Hz 8 amps

Motor Horse Power ½
Dimensions W x H x D (approximate) 22" x 32" x 12" 22" x 52" x 12"
Shipping Weight (estimated pounds) 50 50 60 70

3

⁄8"

3

⁄8"

Ordering Information

MODEl NO. DESCRIpTION

PWR25111011 150 Gallon Per Day Reverse Osmosis System With Auto Flush
PWR25112011 250 Gallon Per Day Reverse Osmosis System With Auto Flush
PWR25113011 600 Gallon Per Day Reverse Osmosis System With Auto Flush
PWR25113021 1200 Gallon Per Day Reverse Osmosis System With Auto Flush
PWR2864 Optional Stainless Steel Leg Kit For All Models

Notes:

• Maximum production based on a feed water of 77°F, SDI < 3, 1000 ppm

TDS, and pH 8.

• Individual membrane productivity may vary (± 15%). May be operated on

other feed waters with reduced capacity.

• Percent Rejection is based on membrane manufacturer’s specifications;

overall system percent rejection may be less.

A Watts Water Technologies Company

USA: North Andover, MA • Tel. [phone] • www.watts.com

Canada: Burlington, ON • Tel. [phone] • www.wattscanada.ca

ES-WQ-PWR2511 1122 © 2011 Watts