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PROBLEM
Dirty or fouled heating surface.
SLOW OR INADEQUATE
HEAT RECOVERY
Condensate may be held in coil.
WATER HAMMER IN
Flooded tube bundle. Improper condensate drainage.
TUBE BUNDLE
This will reduce coil capacity and service life.
Steam control valve out of calibration.
Valve may not close all the way due to loss of charge
in thermostatic bulb. (ruptured bulb)
A vaccum is created when the steam control valve
OVERHEATING OF
closes. This vaccum may be strong enough to hold
WATER IN STORAGE
valve open and allow steam to bleed through and
overheat stored water.
Valve may not be seating because:
1) Dirt (STM)
2) Line drawn seat - oversized valve
Relief valve too small or undersized.
ExCESSIVE PRESSURE
CAUSING RELIEF
Expansion of water from heating may cause excessive
VALVE TO POP:
pressure, as temperature increases so does pressure.
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trouBle shootInG GuIde for hwG
POSSIBLE MALFUNCTION
14
SERVICE TO BE PERFORMED
Clean the heating surface.
Check trap, air vent & vaccum breaker on heating coil.
Check trap size and capacity, also the condensate piping to
make sure it is not operating at a pressure greater than that
in the hot water generator. If trap size too small (increase).
Adjust as necessary.
Check bulb and contact manufacturer of same.
Check vaccum breaker on heating section to make sure it is
operating.
Replace regulator seat (S S).
Check pressure rating and valve operation.
Expansion tank downstream of outlet.
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