MC2: 10/03/12 Page 49 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
Unit Disassembly for Annual Maintenance
1. Disconnect electrical power to the unit by turning off the external circuit breaker.
2. Turn off the external gas supply shutoff valve.
NOTE
The cover is secured with spring clips and pins to front, back and side
panels of the unit. In addition, two (2) groups of ground wires from the
frame of the boiler are attached with clips to the underside of the top
cover. Use care when disconnecting these ground wire clips. Note that
all lugs have capture spring clips that are released by pressing a small
nub under lug itself
3. Remove the top cover from the boiler. A screwdriver may be needed to pry the cover from the two
pins on either end.
4. Carefully detach the ground wire clips from the underside of the cover (see note above).
5. Remove the front panel from the boiler to provide access to the spark igniter and flame detector for
each heat module of the boiler (see Figure 9-2).
6. Refer to Figure 9-2 and locate the installed locations of the igniter and flame detector cables.
NOTE
The number of burner sections, and thus the electrical components,
varies by model.
Figure 9-2: Electrical Connection Locations
Igniter
Cable
MLX Rear with Panel Removed
Flame
Detector
Detector
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