A.R.I. NR-010 EN - Manual (Page 2)

Symptom Cause Corrective action
1 The disc doesn’t closes 1) Interference between the
disc motion and an adjacent
shut-off valve (butterfly)
2) Body deformation due to
over tightening of the
positioning bolts.
1) Separate the two devices,
far enough, to avoid any
physical contact between
the NR-020 disc and the
shut-off valve.
2) Check the tightening
moment of the retaining
bolts to a reasoning level
allowing sealing at the
flanges.
2 Swelling of the Rubber seal
disc In the majority of cases, the
swelling is caused by the
presence of dissolved Chlorine in
the water principally near the
chlorinator in swimming pools or
treatment stations. The use of N-020 in water
with more than
4-6 ppm chlorine dissolved is
not recommended.
3 Leakage from the indicator
rode O-Ring Erosion or chemical attack Change the spring chamber
assembly.
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