Watts PWSR Series, Installation, Operation And Maintenance Manual

Page: 15 / 28

PWSR Series Softeners 15
System Components Described
Drive Cap Assembly
Main Piston and Regenerant Piston
The drive gears turn the main gear of the drive cap assembly, which
moves the piston . The screw-driven, horizontally moving piston stops
at specific positions to direct the flow of water to backwash, regener-
ate, rinse or refill . The PC board determines the position of the piston
by counting pulses produced when the piston is moved . An optical
sensor looking at one of the reduction drive gears generates these
pulses . Each cycle position is defined by a number of pulses . The
counter is zeroed each time the valve goes to the service position .
The PC board finds the service position by noting the increase in cur-
rent delivered to the motor when the mechanical stop at the service
position is reached . This method of controlling piston position allows
for greater flexibility and requires no switches or cams .
One of two main pistons is always used:
1 . The down flow piston which is used when the control valve is
used as a down flow softener, regenerating filter or non regener-
ating filter: or
2 . The up flow piston, which is used when the control valve is used
as an up flow softener .
If the control valve is used as a softener or a regenerating filter, are
generant piston must be attached to the main piston . If the control
valve is to be used on system that does not require a regenerant to
be added the regenerant piston must be removed .
Spacer Stack Assembly
The spacer stack assembly provides the necessary flow passage for
water during the different cycles . The all-plastic spacer stack assem-
bly (patent pending) is a one-piece design, which allows the stack to
be removed using your fingers .
The exterior of the stack is sealed against the body bore with self-
lubricating EPDM o-rings while the interior surface is sealed against
the piston using slippery self cleaning directional (one way) silicone
lip seals . The lip seals are red or clear in color and have a special
slippery coating so that the piston does not need to be coated or
lubricated .
Injector
The screen, injector and/or injector plug(s) are installed under the
injector cap in an easy to access location on top of the valve . The
injector cap contains four slots so no water accumulates in the cap .
The injector cap is designed to be hand tightened .
Under the injector cap there is an easy to clean removable screen to
prevent fouling of the injector . There are two holes under the injector
cap labeled “DN” and “UP” . The holes will be filled with a plug or an
injector .
The plug (#KC113010-IZ) prevents water from traveling a certain
pathway . The injector lets water pass through the pathway . The self-
priming injector increases the velocity of the water, creating a zone of
negative pressure that draws in the concentrated liquid regenerant,
such as sodium chloride (brine), potassium permanganate, sodium
hydroxide, hydrochloric acid, etc . The regenerant blends with the
stream of water, which passes through the media to regenerate the
bed .
The injector provides a consistent regenerant/water mixture ratio
over the entire operating pressure range of the control valve . The in-
jector provides good performance in a variety of applications, which
may involve elevated drain lines and long regenerant draw lengths .
Injectors are chosen by knowing the type, amount, and regenerant
flow rate for a particular type of media . The color coded injectors
give different regenerant draw, slow rinse and total flow rates over
the pressure range . See Table 10 for color codes .
Refill Flow Control Assembly
The refill flow control assembly consists of a refill flow elbow, refill
flow control retainer assembly, refill flow control, poly tube insert and
nut assembly . The refill flow control retainer fits in the refill elbow . The
refill flow control retainer houses the refill flow control, which controls
the flow rate when the regenerant tank is being refilled . The refill flow
control is a flexible washer-like part with a small orifice and a preci-
sion molded contour that delivers a steady 0 .5 gpm regenerant tank
refill rate at varying inlet pressures . Refill is accomplished with treated
water .
The refill flow control assembly is installed in an easy to access
refill elbow located on top of the control valve . The refill flow control
assembly is attached to the control valve with a locking clip . The
locking clip allows the elbow to rotate 270 degrees so the outlet can
be orientated towards the regenerant tank .
Drain Line Flow Control/Fitting
The drain line flow control assembly includes a drain line flow control
and a fitting . The drain line flow control allows proper media bed
expansion by regulating the flow rate to the drain .
The drain line flow control is a flexible washer-like part with an orifice
and a precision molded contour . The flow rates are - 10%
over the pressure range of 1-0 psi to 125 psi . The flexible washer-like
parts are identified with three numbers, which correspond to the flow
rate in gallons per minute . See Table 11 .
The drain line flow control and fitting are located on top of the control
valve and replaceable without the use of special tools .
Table 10: Injector Order Information
Part # Color Tank Dia.
KC11V3010-1D Red 9"
KC11V3010-1E White 10"
KC11V3010-1F Blue 12"
KC11V3010-1G Yellow 13"
KC11V3010-1I Orange 16"
KC11V3010-1K Lt Green 21"
Table 11: Drain Line Flow Control (3/4" Fitting)
Part #
Number on Backwash Flow Rate
Fitting GPM
KC11V3162-022 22 2.2
KC11V3162-027 27 2.7
KC11V3162-042 42 4.2
KC11V3162-053 53 5.3
KC11V3162-075 75 7.5
KC11V3190-110 110 11