SECTION FOUR – Routine Maintenance and Professional Servicing
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Match each of the water system components with its
appropriate function:
____ Heat Exchanger
____ Manifold Adapter
____ Inlet/Outlet Manifold
____ Internal Bypass Valve
____ Thermal Governor
a) The inlet and outlet piping is connected to this com-
ponent by 2-inch union connections.
b) This component is a valve that throttles water flow
to maintain the Heat Exchanger outlet
temperature above 120° F (49° C).
c) This component compensates for variations in
pump flow by opening to allow excess flow to
bypass the Heat Exchanger.
d) This component surrounds the flameholder to
extract heat from the combustion gases.
e) This component provides plumbing connections
and houses the Thermal Governor and the Internal
Bypass Valve.
Respond to the following statements “Yes” or “No”.
The Manifold Adapter should be removed for routine
cleaning.
Yes ____
No ____
When reinstalling the Manifold Adapter, the O-rings on
the Heat Exchanger tubes should be replaced.
Yes ____
No ____
If any one of the Heat Exchanger tubes is damaged, the
entire Heat Exchanger must be replaced.
Yes ____
No ____
The Thermal Governor is non-serviceable. It must be
replaced if defective.
Yes ____
No ____
Before servicing or replacing the Internal Bypass Valve,
the Manifold Adapter must be removed.
Yes ____
No ____
Aplastic exhaust elbow should be replaced with a
metal elbow as soon as possible.
Yes ____
No ____
4-43
Service
