Hubbell ST User Manual download pdf (Page 28)

SECTION V – TROUBLESHOOTING

(See separate component O&M for additional details.)

Symptom Probable Cause Corrective Action / Remedy

Tubes are fouled. Clean tubes per Section III, annual

scheduled maintenance.

Excess silt in bottom of tank. Drain and flush tank per Section III ,

annual scheduled maintenance.

Air or water leak in

temperature control.

Repair or replace per separate O&M.

Ruptured diaphragm on air

or water operated valve.

Repair or replace per separate O&M.

Debris in Accritem. Clean Accritem.

Strainers clogged. Clean strainers per Section III, annual

scheduled maintenance.

Gradual loss of heating

capacity.

Pump impellor deteriorated. Repair or replace per separate O&M.

Temperature regulator has

lost its charge, self contained

valves only.

Repair or replace per separate O&M.

Ruptured tube(s) in heating

coil.

Remove / replace heating coil.

Temperature regulator needs

adjusting.

Adjust temperature regulator per

Section IV.

Circulator not operating. Repair or replace per separate O&M.

Debris under seat of

temperature control valve.

Repair or replace per separate O&M.

Overheating.

Capillary tube pinched on

temperature control.

Repair or replace per separate O&M.

Rib blown out of tube side

gasket.

Remove heating coil and replace

gasket.

Capillary tube pinched on

temperature control.

Repair or replace per separate O&M.

Ruptured diaphragm on

temperature control valve.

Repair or replace per separate O&M.

Defective steam trap. Repair or replace per separate O&M.

Blockage in condensate line. Clean blockage from condensate line.

Immediate loss of heating

capacity.

Loss of air pressure on

temperature regulator.

Check air pressure to temperature

regulator. Verify that it is within

limits. Adjust as necessary.

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Hubbell ST User Manual Page 28

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