AERCO BMK 6000 - Manual (Page 31)

Benchmark 6000 Boiler Installation, Operation & Maintenance Manual
CHAPTER 2 – INSTALLATION
OMM-0086_0D AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 31 of 210
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03/20/14
• When 0-10VDC is selected, the voltage output is used by the controller to modulate the
combustion blower via the I/O Box terminals labeled VFD/Blower (Section 2.10.11).
• If On Board Boiler Sequencing Technology (BST) is enabled, the Analog Output terminals
are used to drive the isolation valve, open and closed.
• When the 4-20mA is selected for the Analog Output, the 0-10VDC is disabled at the
VFD/Blower terminals, and the selected output is available at the terminals labeled
Analog Output +/-.
2.10.9 RS485 Comm Terminals
The RS-485 communication terminals (+, GND, & -) are used when the boiler plant is being
controlled by an Energy Management System (EMS) or AERCO ACS (formerly BMS/BMS-II)
using Modbus (RS-485) communication.
2.10.10 RS232 Comm Terminals
The RS-232 communication terminals (TxD, RxD) permit a laptop computer or other suitable
terminal to be connected to the boiler. The RS-232 communication feature permits viewing or
changing of Control Panel menu options and also provides access to data logs showing fault and
sensor log displays.
2.10.11 VFD/BLOWER Terminals
These terminals (0-10 & AGND) send an analog signal to control the blower speed. When any of
the 4-20mA options is selected for the Analog Outputs (Section 2.10.8), the output from the
VFD/Blower terminals is disabled.
2.10.12 Interlock Terminals
The unit offers two interlock circuits for interfacing with Energy Management Systems and
auxiliary equipment such as pumps or louvers or other accessories. These interlocks are called
the Remote Interlock and Delayed Interlock ((REMOTE INTL’K IN and DELAYED INTL’K IN in
Figure 2-12). Both interlocks, described below, are factory wired in the closed position (using
jumpers).
NOTE
Both the Delayed Interlock and Remote Interlock must be in the
closed position for the unit to fire.
2.10.12.1 Remote Interlock In (OUT & IN)
The remote interlock circuit is provided to remotely start (enable) and stop (disable) the unit
if desired. The circuit is 24 VAC and comes factory pre-wired closed (jumped).
2.10.12.2 Delayed Interlock In (OUT & IN)
The Delayed Interlock terminals can be used in one of two ways:
• In conjunction with the optional external sequencing valve (see section 2.14 and
Chapter 10 – BST), a component of AERCO’s on-board Boiler Sequencing
Technology (BST) solution. By default a cable of the boiler’s wiring harness is
connected to these terminals. If BST is implemented, the other end of that cable is
connected to the sequencing valve.