EQUIPMENT INSTALLATION
Autotrol 255 Valve Control Module Features
400 Series Control
Variable Brine
Control
Injector Access Plug
Air Check
Optional i-lid Cover
Figure 1
Tank Adapter Module Features
B
Y
P
A
S
S
B
Y
P
A
S
S
Optional Bypass
Probe Connection Slot
Air Check
Brine Line Fitting
Connection 1/4-inch NPT
Tank Thread 2-1/2 inch - 8 male
Inlet Connection
3/4-inch or 1-inch
NPT or BSPT
Drain Connection
3/8-inch or
1/2-inch NPT or
BSPT
Outlet connection
3/4-inch or 1-inch
NPT or BSPT
Figure 2
System Regeneration Cycles
1. Service (Downflow):
Untreated water is directed down through the resin bed and up
through the riser tube. The hardness ions attach themselves
to the resin and are removed from the water. The water is
conditioned as it passes through the resin bed.
2. Backwash (Upflow):
The flow of water is reversed by the control valve and directed
down the riser tube and up through the resin bed. During the
backwash cycle, the bed is expanded and debris is flushed to
the drain.
3. Brine/Slow Rinse (Downflow):
The control directs water through the brine injector and brine
is drawn from the regenerant tank. The brine is then directed
down through the resin bed and up through the riser tube to
the drain. The hardness ions are displaced by sodium ions and
are sent to the drain. The resin is regenerated during the brine
cycle. Brine draw is completed when the air check closes.
4. Fast Rinse (Downflow):
The control directs water down through the resin bed and
up through the riser tube to the drain. Any remaining brine
residual is rinsed from the resin bed.
5. Brine Refill (Downflow):
Brine refill occurs during a portion of the fast rinse cycle.
Water is directed to the regenerant tank at a controlled rate, to
create brine for the next regeneration.
6. Repressurize Cycle — (No Flapper Open):
This cycle closes all flappers for a short time to allow the
air and water to hydraulically balance in the valve before
continuing the regeneration.
SERVICE BACKWASH BRINE/SLOW RINSE
FAST RINSE
From Regenerant
Tank
To Regenerant
Tank
BRINE REFILL
REPRESSURIZE
C0 C1 and C6 C2 and C3
C4 C5 and C7 C8
Figure 3
NOTE: All plumbing must conform to local codes. Inspect
unit carefully for carrier shortage or shipping damage.
Location Selection
1. The distance between the unit and a drain should be as
short as possible.
2. If it is likely that supplementary water treating equipment
will be required, make certain adequate additional space
is available.
3. Since salt must be added periodically to the brine tank, the
location should be easily accessible.
4. Do not install any unit closer to a water heater than a total
run of 10 feet (3 m) of piping between the outlet of the
conditioner and the inlet to the heater. Water heaters can
sometimes overheat to the extent they will transmit heat
back down the cold pipe into the unit control valve. Hot
water can severely damage the conditioner. A 10 foot (3-m)
total pipe run, including bends, elbows, etc., is a reasonable
distance to help prevent this possibility. A positive way to
prevent hot water from flowing from heat source to the
conditioner, in the event of a negative pressure situation,
is to install a check valve in the soft water piping from
the conditioner. If a check valve is installed, make certain
the water heating unit is equipped with a properly rated
temperature and pressure safety relief valve. Also, be
certain that local codes are not violated.
5. Do not locate unit where it or it’s connections (including
the drain and overflow lines) will ever be subjected to room
temperatures under 34°F (1°C) or over 120°F (49°C).
6. Do not install unit near acid or acid fumes.
7. The use of resin cleaners in an unvented enclosure is
not recommended.
4 •AUTOTROL
®
255 Valve/400 Series Service Manual
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