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2 bcm (boiler communication module), 1 bcm features and functions, 2 bcm description – AERCO Modulex EXT 1530 - 3060 User Manual

Page 78: Modulex ext

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MODULEX EXT

1530, 1912, 2295, 2677, 3060 Boilers

Installation, Operation & Maintenance Manual

4.2 BCM (Boiler Communication Module)

NOTE

Only the basic features and functions of the BCM are described in

the following sections. Refer to the E8 Controller User Manual (GF-

115-C) for detailed information and diagrams for wiring and using

the BCM in its various capacities.

The BCM (Boiler Communication Module) is an electronic module in MODULEX boilers, 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 the 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 four and eight

independent, 382,000 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 4-6. Additional information for the BCM component

can be found in Section 7, 9, and 10 of the E8 Controller User Manual (GF-115-C).

4.2.1 BCM Features and Functions

When installed and enabled, the BCM enhances the range of control functions offered by the

Modulex Boilers. These additional control functions include the following:

Providing a fault relay which energizes when any fault condition occurs in the Modulex

Boiler.

Serving as a Back-up Controller in the event that the primary E8 Controller fails.

Providing a 0-10V output to control a variable speed primary pump

May be selected as the Primary Controller instead of the E8.

Functioning as a “Slave” to a “Master” Energy Management System (EMS), Building

Automation System (BAS) or AERCO’s Boiler Management System II (BMS II/AERCO

Control System [ACS]) on a Modbus Network.

4.2.2 BCM Description

The BCM shown in Figure 4-6 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 control panel.
Input/Output (I/O) connections to the BCM are made via four connectors mounted on the

Printed Circuit Board (PCB) of the BCM. Three 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, which is used to set the

corresponding address of the boiler on the input Modbus or EBUS Network.
Refer to Tables 4-5 and 4-6 for details on the features and functions of the BCM.

Page 78 of 138

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913

OMM-0095_0E

12/01/14

Phone: 800-526-0288

GF-139