PWSR Series Softeners
3
Control Valve Functions
Control Valve Function and Cycles of Operation
This glass filled Noryl fully automatic control valve is designed as the
primary control center to direct and regulate all cycles of a water
softener . The control valve can be set to regenerate on demand
(consumption of a predetermined amount of water) and/or as a time
clock (passage of a particular number of days) .
The control valve is compatible with a variety of regenerants and
resin cleaners . The control valve is capable of routing the flow, of
water in the necessary paths to regenerate or backwash water
treatment systems . The injector regulates the flow of brine or
other regenerants . The control valve regulates the flow rates for
backwashing rinsing and the replenishing of treated water into a
regenerant tank .
The control valve is designed to deliver high service (27 gpm @ 15
psig) and backwash (27 gpm @ 25 psig) flow rates when the bypass
has straight fittings . The control valve uses no traditional fasteners
(e .g . screws), instead clips, threaded caps and nuts and snap
type latches are used . Caps and nuts only need to be firmly hand
tightened because radial seals are used . Tools required to service
the valve include one small blade screwdriver, one large blade
screwdriver, pliers and a pair of hands . A plastic wrench is available
which eliminates the need for screw-drivers and pliers . Disassembly
for servicing takes much less time than comparable products
currently on the market .
The transformer power pack comes with a 15-foot power cord and
is designed for use with the control valve . The transformer power
pack is for dry location use only . The control valve remembers all
settings for two hours if the power goes out . After two hours the
only item that needs to be reset is the time of day, all other values
are permanently stored in the nonvolatile memory . The control valve
does not need batteries .
When the control valve is used as a down flow softener, two
backwashes always occur . The softener will start regenerant
prefill before regeneration, the prefill starts two hours before the
regeneration time set . During the 2-hour period in which the brine is
being made, treated (softened) water is still available . For example:
regeneration time = 2:00 am, prefill option selected, downflow
softener . Fill occurs at 12:00 a .m ., start of backwash cycle occurs at
2:00 a .m .
The softener will adjust the backwash and rinse cycles automatically
increase with increasing, salt dosage . Backwashes can be set
to be NORMAL or LONGER . The option selected will apply to all
backwashes . Tables 4 and 5 show the length of the cycles when the
valve is set up as a softener .
Regeneration Steps and Purpose:
Brine fill –
Brine tank is filled to dissolve salt for next regeneration .
Backwash –
Flow through the resin bed is reversed . Water flows
upward expanding and agitating the resin bed .
Brine in –
Brine is educted from the brine tank and pass-es through
the resin bed in a downward flow, thus removing calcium and
magnesium that has accumulated on the resin beads and is flush to
drain .
Backwash –
A second backwash is performed
Rinse –
The resin is now flushed downward at a set flow rate . This
resettles the bed and rinses out any remaining brine left in the resin
bed .
Service –
Softener goes back into service and ready to soften water .
Exchange Capacity Data
20,000 grain approx . per cu . Ft .
6 lbs . salt-sodium chloride
25,000 grain approx . per cu . Ft .
8 lbs . salt-sodium chloride
30,000 grain approx . per cu . Ft .
15 lbs . salt-sodium chloride
To convert parts per million (PPM) or milligrams per liter (mpl) to
grains divide by 17 .1
Example:
Water hardness of 250 PPM
(250 PPM divided by 17 .1 PPM/gr .) equals 14 .6 gr .
It is recommended that a good grade of solar or pellet salt be used .
One-gallon water will dissolve approximately 3 .0 lbs . of salt
One gallon of saturated brine weighs 10 .74 lbs .
NOTICE
Summary of Contents for PWSR Series
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