Dosatron D25 Series Istruzioni operative

Troubleshooting for D25 Series

Symptom Cause Solution

Piston

Piston is not clicking The unit is installed in the wrong

direction The arrow on the unit should point in the same

direction as the water flow. Water supply and

demand valves should be open.

Piston locked up/not clicking Reset piston. See instructions.

Broken actuator spring Replaced both actuator springs.

Excessive water flow 1. Reduce the flow rate and slowly restart the

unit.

2. Remove the lid, pull out the piston and check

if the O-rings around the piston valves are

missing or dislodged.

3. Reset piston (see instructions) screw lid back

on.

Water hammer Reset piston (see instructions) and install water

hammer arrestor in the appropriate location.

In-line water filter is clogged Clean the in line water filter.

Worn, scratched/scored piston shell and/

or body Do piston “fit” test (see instructions). replace

piston shell and/or body. Make sure your

installation has a 200 mesh filter before the

Dosatron.

Dosing

Water flowing back into

solution container Check valve dirty, worn, assembled

incorrectly or missing. Clean or replace the check valve assembly. Be

sure the check valveseal is in proper position.

No suction of solution Piston locked up/not clicking Reset piston. See instructions.

Air leak in the suction tube

Check suction tube connection. Inspect suction

tube for pin holes or cracks.

Check tightness of connection nuts.

Cut ½” of top of the hose and reattach it

correctly.

Suction tube or strainer clogged Clean suction tube and strainer or replace hose

assembly.

Raise strainer 2” off the bottom of stock tank

solution.

Check valve worn, improperly

assembled, dirty or damaged Clean or replace check valve assembly. Be sure

the check valve seal is in proper position.

Plunger seal is damaged, swollen or

missing Clean or replace plunger seal.

If plunger seal is missing, check incoming water

pressure; refer to unit manual for specifications.

Page 1

Symptom Cause Solution

Dosing

No suction of solution (cont.) Worn, scratched/scored piston shell and/or

body Do piston “fit” test (see instructions). If neces-

sary replace piston shell and/or body. Make

sure your installation has a 200 mesh filter

before the Dosatron.

Suction of air Check suction tube connection. Inspect

suction tube for pin holes or cracks.

Check tightness of connection nuts.

Cut ½” off top of the hose and reattach it

correctly.

Excessive water flow Listen to the unit clicking, count the

individual clicks, shouldnot exceed 46 clicks

in 15 seconds otherwise is

excessive flow. If excessive flow reduce the

flow rate and restart the unit slowly.

Worn plunger seal Replace plunger seal.

Worn or cracked injection stem (inside and

outside) . Replace injection stem.

Check valve worn, improperly assembled,

dirty or damaged Clean or replace check valve assembly. Be

sure the check valveseal is in proper position.

Leaks

Leaks near the metal collar

under the body. Sleeve O-ring damaged, improperly posi-

tioned or missing Replace sleeve O-ring.

Leaks between adjusting nut

and the anti-lock ring. Dosing stem O-ring damaged, improperly

positioned or missing Clean and replace dosing stem O-ring.

Leaks between body and lid. Lid O-ring damaged, improperly positioned

or missing Clean the seating surface of the O-ring and

position O-ring correctly or replace the lid O

-ring.

Troubleshooting for D25 Series

Page 2

D25 Series Piston “Fit” Test

Insert piston into the body half way down, suspend the unit from the

valve support ONLY

ONLY, then lift it. The piston should be snug in the body

and the body should not fall off. If it does, the piston shell needs to be

replaced. Also inspect the inside of the body and look for deep

vertical scratches. If this is the case, the body needs to be replaced.

Page 3

Reset D25 Series Piston

To reset the piston, remove the lid and push the piston all the way

down. It may click. Pull the piston all the way up. Holding it in the

up position, push down on the vertical rod and it should click.

Push the piston back all the way down and it should click again.

Screw the lid on.

Page 4 2007-39-MAINT003

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