Benchmark 2.0 LN Installation, Operation & Maintenance Manual
CHAPTER 5 – MODE OF OPERATION
OMM-0046_0J AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 69 of 168
GF-123 Ph.: 800-526-0288 06/18/2015
combo boilers heat water to a constant setpoint temperature. That water is then circulated
through a heat exchanger in a domestic hot water storage tank.
When the space-heating load is such that all the space-heating boilers are at the 100% valve
position, the BMS/ACS will then operate the domestic boilers to become space-heating boilers,
provided the domestic hot water load is satisfied. If the domestic hot water load is not satisfied,
the combo boiler(s) remain on the domestic hot water load. If the combo boilers switch over to
space heating, but there is a call for domestic hot water, the combo units will resume heating
water for domestic needs.
When the combo units are satisfying the domestic load they are in constant setpoint mode of
operation. When the combo units switch over to space heating, their mode of operation changes
to the BMS mode. For more information concerning the operation of the Combination Control
Panel see the AERCO CCP-1 literature (BMS 168 applications) and TAG-0050 (ACS).
5.7.1 Combination Control System Field Wiring
Wiring for this system is between the BMS Model 168 panel, the CCP and the B.M.S. (PWM) IN
terminals in the I/O Box. For ACS applications, the wiring is between the ACS Panel, the ACS
Relay Panel (optional, depending on application), and the RS485 Comm terminals in the I/O
box. Wire the units using a shielded twisted pair of 18 to 22 AWG wire. When wiring multiple
units, each unit’s wiring must conform to the above. For a complete CCP system wiring
diagram, see the AERCO CCP-1 literature (BMS 168 applications) and TAG-0050 (ACS).
5.7.2 Combination Control System Setup and Startup
Setup for the Combination Mode requires entries to be made in the Configuration Menu for
boiler mode, remote signal type and setpoint. The setpoint is adjustable from 40°F to 240°F.
Enter the following settings in the Configuration Menu:
MENU OPTION
SETTINGS
BMS 168 Applications ACS Applications
Boiler Mode Combination Combination
Remote Signal BMS (PWM Input) Network (RS485)
Internal Setpt 40°F to 240°F 40°F to 240°F
Refer to paragraph 3.3 for instructions on changing menu options.
While it is possible to change other temperature-related functions for combination mode, these
functions are preset to their factory default values. These default settings work well in most
applications. It is suggested that AERCO be contacted prior to changing settings other than the
unit’s setpoint. For a complete listing of temperature related function defaults, see Appendix E.
To set the unit to the manual mode, press the AUTO/MAN switch. The MANUAL LED will light.
To set the unit back to the auto mode, press the AUTO/MAN switch. The MANUAL LED will go
off and the REMOTE LED will light.
When the boiler is switched to BMS mode, the AERCO BMS/ACS controls the valve position.
There are no setup requirements to the boiler(s) in this mode.
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