Technical Documents

14
TROUBLESHOOTING
TROUBLE SHOOTING GUIDE FOR HWG
PROBLEM POSSIBLE MALFUNCTION SERVICE TO BE PERFORMED
SLOW OR INADEQUATE
HEAT RECOVERY
Dirty or fouled heating surface. Clean the heating surface.
Condensate may be held in coil. Check trap, air vent & vaccum breaker on heating coil.
WATER HAMMER IN
TUBE BUNDLE
Flooded tube bundle. Improper condensate drainage.
This will reduce coil capacity and service life.
Check trap size and capacity, also the condensate piping to
make sure it is not operating at a pressure greater than that

OVERHEATING OF
WATER IN STORAGE
Steam control valve out of calibration. Adjust as necessary.
Valve may not close all the way due to loss of charge

Check bulb and contact manufacturer of same.
A vaccum is created when the steam control valve
closes. This vaccum may be strong enough to hold
valve open and allow steam to bleed through and
overheat stored water.
Check vaccum breaker on heating section to make sure it is
operating.
Valve may not be seating because:
  
  

EXCESSIVE PRESSURE
CAUSING RELIEF
VALVE TO POP:
Relief valve too small or undersized. Check pressure rating and valve operation.
Expansion of water from heating may cause excessive
pressure, as temperature increases so does pressure.
Expansion tank downstream of outlet.