AERCO BMS II BOILER - Manual (Page 21)

INSTALLATION
2-9
BIAS DIP
SWITCHES
NOTE:
THE BIAS DIP SWITCHES CAN BE ACCESSED
FROM THE WIRING COMPARTMENT WITHOUT
REMOVING THE FRONT PANEL FROM THE UNIT.
WIRING COMPARTMENT
Figure 2-6. Location of BMS II DIP Switches
2.7 RS485 (MODBUS) WIRING, BIAS & TERMINATION AT AERCO
BOILERS
The RS485 wiring connections at the AERCO Boilers will depend on the type of AERCO Boilers and
Control Systems being used on the Modbus Network. Benchmark Series and KC1000 Boilers currently
utilize C-More Control Systems. Modulex Series Boilers utilize Boiler Control Modules (BCMs) with E8
Controllers.
RS485 Wiring, Termination& Bias for Benchmark Series and KC1000 Boilers
RS485 wiring connections are made at the RS485 COMM terminals of each boiler’s I/O Box (Figures 2-7
or 2-8). However, activating bias and loop termination can be performed using one of two available
methods as described below: