AERCO BMK 1.5 LN Dual Fuel Feb 2013 - Manual (Page 21)

CHAPTER 2: INSTALLATION
PR2: 05/09/12 Page 21 of 162
Benchmark 1.5LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0041_0C
GF-121
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
108M (BMS), GF-124 (BMS II Model 5R5-384), and GF-131 (ACS) operation manuals.
Remote Setpoint and Direct Drive Modes 2.9.4
The Benchmark 1.5 Boiler can accept several types of signal formats from an Energy
Management System (EMS), Building Automation System (BAS) or other source, to control
either the setpoint (Remote Setpoint Mode) or air/fuel valve position (Direct Drive Mode) of the
Boiler. These formats are:
• 4 to 20 mA/1 to 5 VDC
• 0 to 20 mA/0 to 5 VDC
• PWM – (Pulse Width Modulated signal. See para. 2.10.4)
• Network (RS485 Modbus. See para. 2.10.7)
While it is possible to control a boiler or boilers using one of the previously described modes of
operation, it may not be the method best suited for the application. Prior to selecting one of
these modes of operation, it is recommended that you consult with your local AERCO
representative or the factory for the mode of operation that will work best with your application.
For more information on wiring the 4 to 20 mA / 1to 5VDC or the 0 to 20 mA / 0 to 5 VDC, see
paragraph 2.9.3.
Combination Mode 2.9.5
NOTE
Only BMS Model 168 and ACS can be utilized for the Combination
Mode, not the BMS II (Model 5R5-384).
With a Combination Mode unit, field wiring is between the unit’s I/O Box wiring terminals, the
CCP (Combination Control Panel), and the BMS (Boiler Management System). For ACS
applications, the wiring is between the ACS panel, the ACS Relay panel (optional, depending on
applications), and the RS485 comm terminals in the I/O box. The wiring must be accomplished
using twisted-shielded pair wire from 18 to 22 AWG. Polarity must be maintained.
For further instructions and wiring diagrams, refer to the GF-108 Boiler Management System
Operations Guide and the CCP-1 data sheet (BMS 168 applications)/GF-131 and TAG-0050
(ACS applications).