Hubbell Electric Heater Company T 用户手册

 

 

14 

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.