AERCO C-More Controls - Manual (Page 33)

C-MORE CONTROL PANEL OPERATION
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
F 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.
5.3.4.1 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.
5.3.4.2 Direct Drive Startup
Since this mode of operation is factory preset
and the fire rate 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
Model 5R5-384 can utilize only RS485
signaling to the Boiler.
The BMS mode of operation is used in
conjunction with an AERCO Boiler Management
System. 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 boilers; 8 via pulse width modulation
(PWM) and up to 32 via Modbus (RS485)
network communication. For BMS programming
and operation, see GF-108M (BMS Model 168)
and GF-124 (BMS II Model 5R5-384), BMS
Operations Guides. For operation via an RS485
Modbus network, refer to Modbus
Communication Manual GF-114. The AERCO
BMS monitors all system-related parameters
and modulates the firing rates of the units.
To enable the BMS Mode, the following menu
settings must be made in the Configuration
Menu:
MENU OPTION SETTING
Boiler Mode Direct Drive
Remote Signal BMS (PWM Input)
or
Network (RS485)
Refer to paragraph 2.2 for instructions on
changing menu options.
5.3.5.1 Boiler Management System External
Field Wiring
Wiring for this system configuration is connected
between the BMS panel Model 168, boilers 1
through 8, to the B.M.S. (PWM) IN terminals in
the I/O Box on the Boiler. Refer to the wiring
diagram provided on the cover of the I/O Box.
Wiring connections for RS485 Modbus control
are made between connector JP11 on the BMS
Model 168 (boilers 9 to 40)/or JP6 on BMS II
Model 5R5-384 (boilers 1 to 32 and the RS485
COMM terminals in the I/O Box.
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