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All installations and services must be performed by qualified service personnel.
C. HEAT EXCHANGER CLEANING INSTRUCTIONS
The heat exchanger must be cleaned by a qualified service person.
:
For oil-fired units, it is important to inspect and clean the heat exchanger once a year, or as
necessary, to remove any build-up of soot. A layer of soot on the inside of the heat exchanger
will act as an insulator, reducing heat transfer, resulting in reduced efficiency
For gas-fired units, the presence of a layer of soot on the heat exchanger is a strong indicator
of incomplete combustion. The burner adjustment should be rechecked as well as the firing
rate, the combustion air supply, and the vent system.
To clean the heat exchanger,
1. First, turn off all power to the unit.
2. Remove the clean-out plate, immediately above the burner (refer to Figure 8), to gain
entry to the cleanout covers.
3. Remove cleanout covers, the vent connector pipe to the chimney, the burner and the
burner mounting plate. When removing the cleanout cover, special care must be taken
not to damage the gaskets or high limit switch.
NOTE: The high limit switch may be removed for easier access to the left-hand cleanout
cover by removing the two (2) limit mounting screws. The limit must be reinstalled in the
original orientation before operating the furnace.
Should the gaskets separate, crack, break, or otherwise not be able to provide the
necessary seal, the gasket must be replaced before reattaching the cleanout cover.
4. With access to the inside of the heat exchanger through the burner cleanout openings and
the vent pipe connection, it is now possible to use a long, flexible wire brush and an
industrial-type vacuum cleaner to remove any soot build-up.
NOTE: A one inch (outside diameter) vacuum cleaner hose will fit into the radiator.
To vacuum and brush the outer radiator of the heat exchanger, go through the cleanout
openings in both directions, as shown in Figure 8.
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