
06/05/13 AERCO International, Inc. •100 Oritani Dr. •Blauvelt, NY 10913 •Ph: 800-526- 0288 Page 4of 112
Modulex E8 Controller and BCM
Operations and Maintenance Manual
5.3 0 to 10 Volt Remote Set Point Mode.............................................................48
5.3.1 Remote Signal Source Wiring Connections........................................................ 48
5.3.2 Configuring Remote Signal Source..................................................................... 49
5.3.3 Setting the Voltage and Set Point Limits for U1/U2 and T1/T2......................... 50
5.3.4 Setting the Curve 11-UO Voltage....................................................................... 51
5.3.5 Viewing the Set Point.......................................................................................... 52
5.4 Domestic Hot Water Operation Using A Tank Sensor ................................52
5.4.1 Sensor Wiring Connections................................................................................. 52
5.4.2 Configuring the Controller for DHW With a Tank Sensor................................. 53
5.4.3 Setting the DHW Set Point ................................................................................. 54
5.4.4 Displaying Temperatures Associated With DHW .............................................. 55
5.5 DHW Operation Using an Aquastat ..............................................................56
5.5.1 Sensor Wiring Connections................................................................................. 56
5.5.2 Configuring the Controller for DHW With an Aquastat..................................... 56
5.5.3 Setting the DHW Set Point ................................................................................. 56
5.5.4 Displaying Temperatures Associated With DHW.............................................. 56
5.6 Boiler & Pump Enable/Disable......................................................................56
6. CONNECTION DIAGRAMS..............................................................58
6.1 Power Terminal Assignments.......................................................................59
6.2 Sensor Terminal Assignments......................................................................60
7. BOILER COMMUNICATIONS MODULE (BCM)................................62
7.1 Boiler Communications Module (BCM) Description ...................................62
7.2 BCM Fault Relay.............................................................................................64
7.2.1 BCM Fault Relay Wiring.................................................................................... 64
7.2.2 Clearing Faults .................................................................................................... 64
7.3 BCM Configured as Back-Up Controller ......................................................65
7.3.1 BCM Back-Up Controller Wiring....................................................................... 65
7.4 BCM Configured as Primary Controller Utilizing Modbus..........................66
7.4.1 Operating Scenario.............................................................................................. 66
7.4.2 Physical Modbus RS485 Wiring......................................................................... 67
7.4.3 Disconnecting the E8 from the E-Bus on the BCM Board................................. 68
7.4.4 AERCO BMS II/ACS Master to BCM Slave Wiring Connections.................... 69
7.4.5 EMS or BAS Master to BCM Slave Wiring Connections.................................. 69
7.5 RS485 Loop Termination Resistors and Bias..............................................69
7.5.1 Master AERCO BMS II/ACS or EMS/BAS Terminating Resistor and Bias..... 69
7.5.2 BCM Controller Terminating Resistor and Bias................................................. 70
7.6 Modbus Network Wiring Diagram.................................................................70
7.7 Modbus Software Set-Up...............................................................................74
7.7.1 BCM Set-Up for Modbus Operation................................................................... 74
7.7.2 Monitoring and Configuration Only ................................................................... 75