MC2: 10/03/12 Page 62 of 90
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
Modulex MLX Series Gas Fired Boiler System
Operation and Maintenance Manual
Replacement of Aluminum Burner Sections
1. Remove any residual silicone from the exposed surfaces of sections being kept in service with a
sharp blade and/or appropriate solvent.
2. Apply two (2) new beads of grey silicone acetyl on each section side that will mate with another
section as indicated by the white lines in Figure 8-22; two (2) places on each side for middle sections
or two (2) places on one side for end sections. Use enough silicone to ensure a water-tight seal.
3. Place the new replacement section(s) together and reassemble with the four (4) metal rods, washers,
and nuts. Tighten hardware and wipe away any oozing excess silicone.
Figure 9-20: Applying Silicone Beads on Replacement Section
9.4.3 Replacing the Condensate Tray Top Gasket
The aluminum burner assembly rests directly on top of the condensate tray gasket so it is necessary to
hoist the entire burner assembly up at least a little to access the gasket. Use a hoisting frame to avoid
damage to components by the tensioned straps. Follow instructions below to replace the gasket.
Replacement of Condensate Tray Top Gasket
1. Wrap hoisting straps around top left & right metal rods (holding sections together) at four points
where the rod enters a section, to avoid bending the rod. If boiler frame is used to anchor the hoisting
straps, make sure straps are securely fastened and not twisted before working under the burner
assembly.
2. This gasket is in four pieces which fit together into the appropriate shape. Remove each of four
gasket sections and any residual adhesive from the condensate tray top flange.
3. Install each of the four separate replacement gasket sections to the top flange of the condensate tray
from each side of the tray. Apply a long bead of silicone to affix the gasket to the tray and a long bead
of silicone to the top of the gasket to create a watertight seal between tray and burner assembly.
4. Lower the aluminum Burner Assembly back onto condensate tray.
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