Modulex EXT Commercial Series Boilers User Manual
CHAPTER 5: E8 Controller and BCM Modules
OMM-0095_0H
AERCO International, Inc.
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GF-139
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09/15/2017
TABLE 5-6: BCM 3-Position and 2-Position Switch Functions
2-POS SWITCH
(ENABLE/DISABLE)
3-POS SWITCH
(I/O/II)
Position I
(NOTE 1)
Position O
(see NOTE 2)
Position II
(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
of the E8 Controller User
Manual (GF-115-C) 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
of the E8 Controller User Manual
(GF-115-C) for setting HEAT Modes.