AERCO C-More Controls Manual June 2010 - Manual (Page 69)

C-More Controller for Benchmark, Innovation & KC
USER MANUAL
04/22/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 Page 69 of 162
OMM-0032_0E Phone: 800-526-0288 GF-112
In addition to the current and voltage signals described above, the Direct Drive mode can also
be driven by a RS-485 Modbus Network signal from an EMS or BAS.
When in a Direct Drive mode, the boiler is a slave to the energy management system and
does not have a role in temperature control. Direct Drive can be used to drive single as well
as multiple boilers.
NOTE
If a voltage, rather than current signal is used to control the
remote setpoint, a DIP switch adjustment must be made on the
PMC Board in the Control Box. Refer to Appendix D for details.
To enable the Direct Drive Mode, the following menu setting must be made in the Configuration
Menu:
MENU OPTION SETTING
Boiler Mode Direct Drive
Remote Signal 4-20mA/1-5V,
0-20mA/0-5V, or Network
Refer to paragraph 2.2 for instructions on changing menu options.
If the Network setting is selected for RS485 Modbus operation, a valid Comm Address must be
entered in the Setup Menu. Refer to Modbus Communication Manual GF-114 for additional
information.
Direct Drive Field Wiring
The only wiring necessary for Direct Drive mode is connection of the remote signal leads
from the source to the ANALOG IN terminals at the I/O Box. For a Network setting, the
connections are made at the RS-485 COMM terminals in the I/O Box. The signal must be
floating, (ungrounded), and the wire used must be a two wire shielded cable of 18 to 22
AWG. Polarity must be observed. The source end of the shield must be connected at the
source. When driving multiple units, each unit’s wiring must conform to the above.
Direct Drive Startup
Since this mode of operation is factory preset and the valve position is being externally
controlled, no startup instructions are necessary. In this mode, the REMOTE LED will light
when the signal is present.
To operate the boiler in manual mode, press the MAN switch. The REMOTE LED will go off and
the MANUAL LED will light.
To change back to the Direct Drive mode, simply press the AUTO switch. The REMOTE LED will
again light and the MANUAL LED will go off.
5.3.5 Boiler Management System (BMS)
NOTE
BMS Model 168 can utilize either pulse width modulation (PWM)
or RS485 Modbus signaling to the boiler. BMS II and ACS can
utilize only RS485 signaling to the boiler.
The BMS mode of operation is used in conjunction with an AERCO Boiler Management System
(BMS, BMS II)/AERCO Control System (ACS). The BMS mode is used when it is desired to
operate multiple units in the most efficient manner possible. The BMS can control up to 40