AERCO C-More Controls Manual June 2010 - Manual (Page 71)

C-More Controller for Benchmark, Innovation & KC
USER MANUAL
04/22/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 Page 71 of 162
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3.08.xx can control up to 8 Innovation Water Heaters utilizing RS485 Modbus communication.
Detailed information and set-up instructions for implementing a WHM System are provided in
Section 8 of this manual.
5.3.7 Boiler Sequencing Technology (BST)
Integrated Boiler Sequencing Technology for Benchmark boilers allows for sequencing
operation up to 8 units, for optimal plant efficiency and uptime reliability. This flash upgradeable
control system can be linked directly to BAS via Modbus protocol and includes options for
integrated valve control and remote monitoring. AERCO also offers a Communications
Gateway to support BACnet, Lonworks and N2 system integration.
NOTE
See Chapter 9 AERCO Boiler Sequencing technology for a
complete description of this solution and instructions for
implementing it.
5.3.8 Combination Control System (CCS)
NOTE
Only the BMS Model 168 and ACS can be utilized for the
Combination Mode, not the BMS II or BST system.
A Combination Control System is one that uses multiple boilers to cover both space-heating and
domestic hot water needs. A BMS and a Combination Control Panel (CCP) or an ACS and ACS
Relay Panel (optional, depending on application) are necessary to configure this system.
Typically, enough boilers are installed to cover the space-heating load on the design day,
however one or more units are used for the domestic load.
The theory behind this type of system is that the maximum space-heating load and the
maximum domestic hot water load do not occur simultaneously. Therefore, boilers used for the
domestic hot water are capable of switching between constant setpoint and BMS modes of
operation. These boilers are the combination units and are referred to as the combo boilers. The
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 (firing rate), 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 go
back to domestic heating.
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)/TAG-0049 (ACS).