06/05/13 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526- 0288 Page 10 of 112
Modulex E8 Controller and BCM
Operations and Maintenance Manual
2.2 BCM Features And Functions
The BCM (Boiler Communications Module) is an electronic module in Modulex boilers (one per
burner), which supports full interoperability to BAS (Building Automation Systems) via Modbus
protocol to make remote communications and control possible. In addition, it provides
customers with a remote alarm contact to notify customers of faults detected within any of
boiler's multiple thermal modules. Finally, in the event the boiler's master controller stops
working, the BCM also takes over operations of the boiler.
As a back-up controller, the BCM further increases the reliability of a product line already known
for its uniquely redundant design. Each Modulex boiler combines between two and seven
independent, 151,500 BTU/hr., pre-assembled thermal modules housed in a common
enclosure. Each module has its own dedicated controller with a combustion safeguard, variable-
speed fan, modulating gas valve, electronic ignition, modulating burner, flow temperature
sensor, thermostat and heat exchanger. The independent operation of these thermal modules
increases each boiler's overall reliability. If a single module requires maintenance or repair, the
other module(s) in the boiler can maintain the system load requirements -- thereby providing a
level of redundancy that was previously only realized in multi-boiler installations.
A photo of the module is shown in Figure 2-2 below. Additional information for the BCM
component can be found in Section 7, 9, and 10.
Figure 2-2: Modulex BCM (Boiler Communications Module)
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