MODULEX EXT 321, 481, 641, 802, 962, 1123 BOILERS
Installation, Operation & Maintenance Manual
Page 124 of 146 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 OMM-0087_0F
07/13/15 Phone: 800-526-0288 GF-143
7.5 Visual Inspection Of The Flame
The burner must flame evenly over the entire surface when operating correctly. The flame must
burn with a clear, ORANGE, stable flame. Check the flame through the flame observation port
(Figure 7-2). The flame pattern should resemble the flame in the illustration below.
FLAME COLOR:
YELLOW = CO2 HIGH NOT SATISFACTORY
BLUE = CO2 LOW NOT SATISFACTORY
ORANGE = OK SATISFACTORY
Figure 7-2: Boiler Flame Observation Port Location
7.6 Proper Reassembly and Resealing of the Vent-Air Intake System
After removing, inspecting, and possibly cleaning the flue pipes and air intake, replace the
piping correctly. Refer to AERCO Venting Application Guide (GF-136-V) for information
concerning Modulex venting requirements.
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