Hubbell Electric Heater Company T - Manual (Page 14)

14
SECTION IV –
TROUBLESHOOTING
Symptom Probable Cause Corrective Action / Remedy
Tubes are fouled. Clean tubes per Section III, annual
scheduled maintenance. Gradual loss of heating
capacity.
Excess silt in bottom of tank. Drain and flush tank per Section III ,
annual scheduled maintenance.
Ruptured tube(s) in heating
coil. Remove / replace heating coil.
Thermostat needs adjusting. Adjust thermostat
Overheating.
Circulator not operating. Repair or replace per separate O&M.
Immediate loss of heating
capacity. Blockage in return line. Clean blockage from return line.
High rate of flow beyond
design conditions. Consult factory. Excessive vibration.
Under sized piping to the
unit. Re-pipe lines to unit using proper
sized lines.
Undersized return lines. Re-pipe return line using proper sized
lines. Water hammer.
Insufficient slope on return
lines causing backup. Increase slope on return lines.
* 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.