255 datasheet(14/20 Pages) PENTAIR

14 / 20 page

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The technology upon which the Series 255 control is based

is well established and proven in service over many years.

however, should a problem or question arise regarding

the operation of the system, the control can be very easily

serviced. The control module can be quickly replaced or

adjustments can be made at the installation. We recommend

that you contact your local professional water treatment dealer

for most concerns. For parts mentioned, refer to exploded

views in the Replacement Parts section of this manual.

IMPortANt: Service procedures that require the water

pressure to be removed from the system are marked with a !

after the possible cause. Refer to Preventative Maintenance

section for instructions.

Valve troubleshooting

Problem

Cause

Correction

brine tank overflow.

Uncontrolled brine refill flow rate.

Remove brine control to clean ball and seat.

Air leak in brine line to air check.

Check all connections in brine line for leaks. Refer

to instructions.

Drain control clogged with resin or other

debris.

Clean drain control.

Flowing or dripping water

at drain or brine line after

regeneration.

Valve stem return spring weak.

Replace spring. (Contact dealer.)

hard water leakage after

regeneration.

Improper regeneration.

Repeat regeneration after making certain correct

salt dosage was set.

Leaking of external bypass valve.

Replace bypass valve. (Contact dealer.)

O-ring around riser pipe damaged.

Replace o-ring. (Contact dealer.)

Control will not draw brine. Low water pressure.

Make correct setting according to instructions.

Restricted drain line.

Remove restriction.

Injector plugged !

Clean injector and screen.

Injector defective !

Replace injector and cap. (Contact dealer.)

Valve disc 2 and/or 3 not closed.

Remove foreign matter from disc and check disc for

closing by pushing in on stem. Replace if needed.

(Contact dealer.)

Air check valve prematurely closed.

Put control momentarily into brine refill. Replace or

repair air check if needed. (Contact dealer.)

14 •Autotrol® 255 Valve/400 Series Service Manual

255 Datasheet(PDF) 14 Page - Pentair plc. All rights reserved.

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