AERCO Modulex E8 Controls Guide - Manual (Page 67)

PR1: 11/30/12 Page 67 of 112
GF-115-C Modulex E8 Controller and BCM
Operations and Maintenance Manual
OMM-0084_0D
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526- 0288
7.4.3 Disconnecting the E8 from the E-Bus on the BCM Board.
NOTE
When the BCM is configured as the primary controller, the E8 will
display the fault code “E200”.
If the BCM was retrofitted in the field utilizing Technical Service Bulletin 2007-07, refer to this
bulletin and disconnect CBL 24 from Connector VII on the E8 Controller. However, if the
Modulex Boiler was shipped with the BCM factory-installed, it will contain a 3-position switch
mounted above the BCM ( Figure 7-8). Refer to the switch matrix in Table 7-1 for descriptions of
how the factory-installed 3-position switch functions with respect to the 2-position ON/OFF
(Enable/Disable) switch on the BCM.
Table 7-1: 3-Position BCM Switch Functions
BCM 2-Pos Switch
(Enable/Disable)
BCM 3-Pos Switch
(Equivalent Terminal in Modulex Wiring Diagram)
Position I
(1b)
(NOTE 1)
Position O (0)
(see NOTE 2)
Position II (1a)
(See NOTE 3)
O (OFF)
(Disable)
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.
I (ON)
(Enable)
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.
NOTES:
1. DO NOT set the 3-Position Switch to Position I.
2. Set the 3-Position Switch to Position O ONLY when controlling Boilers from an external
Controller via Modbus Communication. See Paragraph 3.1.2 for setting HEAT Modes.
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 Paragraph 3.1.2 for setting HEAT Modes.