SECTION IV – TROUBLESHOOTING

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.

Overheating.

Ruptured tube(s) in heating

Remove / replace heating coil.

 

coil.

 

 

Thermostat needs adjusting.

Adjust thermostat

 

Circulator not operating.

Repair or replace per separate O&M.

Immediate loss of heating

Blockage in return line.

Clean blockage from return line.

capacity.

 

 

Excessive vibration.

High rate of flow beyond

Consult factory.

 

design conditions.

 

 

Under sized piping to the

Re-pipe lines to unit using proper

 

unit.

sized lines.

Water hammer.

Undersized return lines.

Re-pipe return line using proper sized

 

 

lines.

 

Insufficient slope on return

Increase slope on return lines.

 

lines causing backup.

 

*Red symptom indicates that equipment should be shut down immediately and cause of malfunction corrected before unit is re-started or serious damage may result.

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Hubbell Electric Heater Company manual Section IV Troubleshooting, Symptom Probable Cause Corrective Action / Remedy

T specifications

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