PR1: 02/23/12 Page 62 of 112
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526- 0288
7. BOILER COMMUNICATIONS MODULE (BCM)
When installed and enabled, the BCM enhances the range of control functions offered by the
Modulex Boilers. These additional control functions include the following:
• BCM provides a fault relay which energizes when any fault condition occurs in the Modulex
Boiler.
• BCM serves as a Back-up Controller in the event that the primary E8 Controller fails.
• BCM can be selected as the Primary Controller instead of the E8.
• BCM can function as a “Slave” to a “Master” Energy Management System (EMS), Building
Automation System (BAS) or AERCO’s Boiler Manage
• ment System II (BMS II/AERCO Control System (ACS) on a Modbus Network.
Paragraphs 7.1 through 7.7, which follow, provide detailed descriptions of the BCM and each of
the additional control functions listed above.
7.1 Boiler Communications Module (BCM) Description
The BCM shown in Figure 7-1 is housed in a compact enclosure measuring 4.13” (105 mm) x
3.50” (89 mm). The BCM is installed on the front of the Modulex Boiler, behind the removable
front panel.
Figure 7-1: Boiler Communications Module (BCM)
Input/Output (I/O) connections to the BCM are made via four connectors mounted on the
Printed Circuit Board (PCB) of the BCM. Two Control Switches are mounted on the clear
plastic cover on the front of the BCM. Three LED Status Indicators are mounted directly on the
BCM PCB and can be viewed through the clear plastic cover. In addition, the PCB contains an
on-board, screwdriver-adjustable 10-position address switch. The control and indicator
functions are illustrated and described in Figure 7-2.
If the Modulex Boiler was shipped with the BCM factory-installed, a third Control Switch is
mounted above the BCM. This switch is used to enable/disable the e-Bus connection between
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