4.9.11 Primary Heat Exchanger
Function
1.
Main part for heat transfer from the burner.
2.
There are multiple paths of water pipes on the heat exchanger surface as well as inside the
combustion chamber which minimizes the heat loss.
Failure Event
1.
Water and/or exhaust gas leakage through a crack.
2.
Improper heat transfer can cause the water in the heat exchanger to boil due to possible scale
formation.
Effects
1.
Exhaust gas leakage.
2.
Excessive heating of the water that produces boiling noises.
Diagnostic
1.
Visual inspection: Check if there is a crack on the surface of heat exchanger.
2.
Sound inspection: Check if boiling occurs inside the unit.
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