AERCO Modulex E8 Controller (and BCM) For Modulex EXT Boilers - Manual (Page 79)

E8 Controller and BCM for Modulex EXT
Installation, Operation & Maintenance Manual
CHAPTER 8: BOILER COMMUNICATION MODULE (BCM)
OMM-0093_0A AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 79 of 108
GF-136-C Ph.: 800-526-0288 PRI: 06/24/2013
The BCM Change-Over Series/Parallel 3-Position Switch and the Enable/Disable (I/0) 2-
Position Switch function as described in Table 8-1.
Table 8-1: Two and Three Position Switch functions
2-POSITION
SWITCH
(BCM Backup)
O
(OFF / DISABLED)
(To NOT use BCM
as backup)
I
(ON \ ENABLED)
(To use BCM as
backup)
3-POSITION
SWITCH
(Internal/External Boiler Control)
I
(NOTE 1)
O
(NOTE 2)
II
(NOTE 3)
DO
NOT
USE
The BCM is the Gate-way
for Modbus and external
control. The E8 does not
control the boiler and the
BCM will NOT take over the
boiler if the Modbus signal
fails.
The E8 is the primary
controller and the BCM
allows monitoring through
Modbus, but will NOT take
over boiler if the E8 fails.
DO
NOT
USE
The BCM is the Gate-way
for Modbus and external
control. The E8 does not
control the boiler and the
BCM WILL take over the
boiler if the Modbus signal
fails. If E8 is in Standby
Mode, BCM will cycle the
pump with the boiler. If E8
is in Day Mode, the E8 will
continuously run the pump.
The E8 is the primary
controller and the BCM
allows monitoring, and the
BCM WILL take over the
boiler if E8 fails. If E8 is in
Standby Mode, E8 will cycle
the pump (must use
Enable/Disable). If E8 is in
Day Mode, the E8 will
continuously run the pump.
NOTE 1
DO NOT set the 3-Position Switch to Position I.
NOTE 2
Set the 3-Position Switch to Position O ONLY when controlling
Boilers from an external Controller via Modbus Communication.
See Section 3.1.2 for setting HEAT Modes.
NOTE 3
Position II is the Default position for the 3-Position Switch. Ensure
it is set to this position when it arrives from the Factory. See
Section 3.1.2 for setting HEAT Modes.
8.2 BCM Fault Relay
The BCM Fault Relay is activated (energized) when a fault condition occurs in the Modulex
Boiler. When activated, the Fault Relay provides contact closure across pins 3 and 4 of
connector Y4 on the BCM board. In addition, the red LED on the BCM board will light
continuously.