Hubbell STH Section V - Troubleshooting, See separate component O&M for additional details

Models: STH ST

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SECTION V – TROUBLESHOOTING

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

Symptom

Probable Cause

Corrective Action / Remedy

Gradual loss of heating

Tubes are fouled.

Clean tubes per Section III, annual

capacity.

 

scheduled maintenance.

 

Excess silt in bottom of tank.

Drain and flush tank per Section III ,

 

 

annual scheduled maintenance.

 

Air or water leak in

Repair or replace per separate O&M.

 

temperature control.

 

 

Ruptured diaphragm on air

Repair or replace per separate O&M.

 

or water operated valve.

 

 

Debris in Accritem.

Clean Accritem.

 

 

 

 

Strainers clogged.

Clean strainers per Section III, annual

 

 

scheduled maintenance.

 

Pump impellor deteriorated.

Repair or replace per separate O&M.

 

 

 

Overheating.

Temperature regulator has

Repair or replace per separate O&M.

 

lost its charge, self contained

 

 

valves only.

 

 

Ruptured tube(s) in heating

Remove / replace heating coil.

 

coil.

 

 

Temperature regulator needs

Adjust temperature regulator per

 

adjusting.

Section IV.

 

Circulator not operating.

Repair or replace per separate O&M.

 

 

 

 

Debris under seat of

Repair or replace per separate O&M.

 

temperature control valve.

 

 

Capillary tube pinched on

Repair or replace per separate O&M.

 

temperature control.

 

Immediate loss of heating

Rib blown out of tube side

Remove heating coil and replace

capacity.

gasket.

gasket.

 

Capillary tube pinched on

Repair or replace per separate O&M.

 

temperature control.

 

 

Ruptured diaphragm on

Repair or replace per separate O&M.

 

temperature control valve.

 

 

Defective steam trap.

Repair or replace per separate O&M.

 

Blockage in condensate line.

Clean blockage from condensate line.

 

Loss of air pressure on

Check air pressure to temperature

 

temperature regulator.

regulator. Verify that it is within

 

 

limits. Adjust as necessary.

 

 

 

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Hubbell STH Section V - Troubleshooting, See separate component O&M for additional details, Symptom, Probable Cause