PR1: 04/01/11 Page| 3
Modulex Fireside (24-month) Maintenance
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288
Technical Instruction Document
1. Fireside (24-Month) Maintenance Instructions
Following are the procedures necessary to perform the Fireside Inspection (24 month) maintenance on
all Modulex MLX boiler models and sizes. Each Fireside Maintenance Kit contains a flame detector,
spark igniter, and associated gaskets for burner modules, flue collector, and condensate tray.
A correctly adjusted Modulex boiler needs very little care other than yearly maintenance. The frequency
of cleaning needed depends on the cleanliness of the air used for combustion. Note that dust present in
the air at the combustion intake will result in reduced burn efficiency and, consequently, reduced heat
output.
This document provides instructions for a Fireside (24-Month) maintenance, including maintenance to
the burner modules, flue collector, spark igniter, and flame detector. These instructions contain all
procedures described in the Annual (12-Month) maintenance instructions (P/N TID-0026) as well as
additional procedures concerning the burner modules. For each of the different Modulex boiler models,
there is an associated maintenance kit P/N, as shown in the table on the cover and at the end of these
instructions.
REQUIRED Tasks:
• Inspect igniter and flame sensor (replace, Igniter: P/N 95251245, Detector: P/N 95251246)
• Check flame detection circuitry (See paragraph 1.3)
• Inspect and clean burner modules (clean if needed) (see Section 1.4)
• Inspect flue collector (clean if needed) (see Section 1.5)
• Wash heat exchanger (clean if needed)
• Inspect air filters (replace if needed, AERCO P/N 95261879)
• Inspect condensate drain lines (clean if needed)
• Check for gas leaks using a soapy solution
• Inspect igniter and flame sensor (replace, Igniter: P/N 95251245, Detector: P/N 95251246)
• Check pH of boiler system water (refer to Appendix C, Boiler Water Chemistry and Maintenance
in MLX boiler manual GF-115-H).
RECOMMENDED Tasks:
• Inspect condensate tray (clean if needed)
• Inspect vent pipe (clean if needed)
• Check and adjust air/fuel ratio (see MLX boiler manual GF-115-H, paragraph 7.5.5)
• Inspect heat transfer surfaces (clean if needed)
• Clean strainer mesh (Monthly)
• Check inlet gas pressure. Changes in gas pressure require combustion recalibration (see MLX
boiler manual GF-115-H, paragraph 7.5.5)
• Check vent and inlet air terminations
• Check electrical supply voltages
Tools Required
Common hand tools, plus a spark gap feeler gauge are required to perform the annual maintenance tasks
described in this bulletin.
Prior to performing the following disassembly and inspection procedures, ensure that all electrical
power to the boiler has been turned off and the external gas shut-off valve is fully closed.
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