MC2: 10/03/12 Page 35 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
• Ensure that the mode of operation settings have been made per document GF-115-C (Controls).
Upon completion of the above items, perform the initial startup and combustion calibration procedures as
described in the following paragraphs.
All installation procedures specified in this document (GF-115H, Section
3) must be completed before attempting to start the unit. DO NOT
attempt to fire the boiler without a full water level. Failure to observe this
precaution can seriously damage the unit and may result in personal
injury or property damage, and is not covered by warranty.
The Modulex boiler has a maximum allowable working pressure of 92
psi (634kPa, 6.34 bar), and a minimum of 15 psi (103 kPa, 1 bar).
7.5.1 Tools & Instruments Required For Combustion Calibration
The following tools and instrumentation are necessary to perform combustion calibration:
• Digital Combustion Analyser: Oxygen (O
2
) and Carbon Dioxide (CO
2
) accuracy to ±0.4%; Carbon
Monoxide (CO) resolution to 1 ppm
• One 16” W.C. manometer or equivalent gauge
• Small and large flat-tip screwdrivers
• T40 Torx tool
• Length of plastic tubing (3/8” I.D.)
7.5.2 Installing the Supply Gas Manometer
Install the W.C. manometer (or gauge) per instructions below.
Installing the Supply Gas Manometer on the Gas Pressure Tap
1. Turn off the external main gas supply valve to the unit.
2. Remove top panel from boiler to access the gas supply manifold (Figure 7-1, top).
3. Locate the gas pressure tap on the gas supply manifold. (Figure 7-1, lower)
4. Using a flat-tip screwdriver, rotate the pressure tap screw counter-clockwise three full revolutions to
the open position.
5. Attach one end of the length of plastic tubing to the gas pressure tap. Attach the other end to the
W.C. manometer (or gauge).
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