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6. Remove the recuperator coil turbulators individually by slowly
pulling each turbulator forward firmly.
7. Clean the recuperator coil tubes using a long handle wire brush,
such as a gun cleaning brush.
8. Clean the primary heat exchanger tubes using a wire brush
attached to a length of high grade stainless steel cable, such
as drain cleanout cable. Attach a variable speed reversible
drill to the other end of the cable. Slowly rotate the cable with
the drill and insert it into one of the heat exchanger tubes.
While reversing the drill, work the cable in and out several times
to obtain sufficient cleaning. Repeat for each tube.
9. Clean residue from furnace using a vacuum cleaner.
10. Replace the parts removed in the previous steps in reverse
order.
11. Turn on electrical power and gas to furnace. Check for leaks
and proper unit operation.
12. Severe heat exchanger fouling is an indication of an operational
problem. Perform the checks listed in Section XIV, Startup
Procedure and Adjustments to reduce the chances of repeated
fouling.
XX. BEFORE LEAVING AN INSTALLATION
• Cycle the furnace with the thermostat at least three times.
Verify cooling and fan only operation.
• Review the Owner’s Manual with the homeowner and
discuss proper furnace operation and maintenance.
• Leave literature packet near furnace.
XXI. REPAIR & REPLACEMENT PARTS
• When ordering any of the listed functional parts, be sure to
provide the furnace model, manufacturing, and serial
numbers with the order.
• Although only functional parts are shown in the parts list, all
sheet metal parts, doors, etc. may be ordered by description.
• Parts are available from your distributor.
Functional Parts List-
Gas Valve Blower Motor
Gas Manifold Blower Wheel
Natural Gas Orifice Blower Mounting Bracket
Propane Gas Orifice Blower Cutoff
Igniter Blower Housing
Flame Sensor Capacitor
Rollout Limit Switch Heat Exchanger
Primary Limit Switch Coil Front Cover
Auxiliary Limit Switch Integrated Control Module
Pressure Switch Transformer
Induced Draft Blower
Door Switch