Direct Drive Field Wiring; Direct Drive Startup - Watts Aerco Benchmark OMM-0117 Operation And Maintenance Manual

Benchmark 5000-6000 Operation & Maintenance Manual
SECTION 3 – MODES OF OPERATION
NOTE:
If a voltage, rather than current signal is used to control the remote setpoint, a DIP switch
adjustment must be made on the CPU Board located in the C-More Controller Assembly.
Contact your local AERCO representative for details.
To enable the DIRECT DRIVE mode, the following menu setting must be made in the
Configuration menu:
TABLE 3-3: Direct Drive Mode Settings
MENU OPTION SETTING
Boiler Mode Direct Drive
Remote Signal 4-20mA/1-5V, 0-20mA/0-5V, or Network
Refer to Section 2.3 for instructions on changing C-More Controller menu options.
If the Network setting is selected for RS-485 Modbus operation, a valid Comm Address must be
entered in the Setup menu. Refer to Modbus Communication Manual GF-114 for additional
information.

3.4.1 Direct Drive Field Wiring

The only wiring connections necessary for DIRECT DRIVE mode are connection of the remote
signal leads from the source to the unit's I/O Box. For either a 4-20mA/0-5V or a 0-20mA/0-5V
setting, the connections are made at the ANALOG IN terminals in 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) at the I/O Box and the wire used must be a two wire shielded
pair from 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.

3.4.2 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 unit in MANUAL mode, press the AUTO/MAN switch. The REMOTE LED will go
off and the MANUAL LED will light (password required).
To change back to the DIRECT DRIVE mode, simply press the AUTO/MAN switch.
REMOTE LED will again light and the MANUAL LED will go off. This will happen automatically
after 1 hour after the password has expired.
OMM-0118_B • GF-203 • 5/9/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
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