AERCO BMS II BOILER - Manual (Page 3)

FOREWORD
i
Foreword
The Model 5R5-384 Boiler Management System II (BMS II) is the latest model of AERCO’s BMS line of
flexible boiler plant controllers.. The system can control a boiler plant comprised of AERCO Benchmark
Series, Modulex Series or KC1000 Boilers. The BMS II can stage and coordinate the operation of up to
32 AERCO Boilers with maximized efficiency. With individual boilers with turn-down ratios as high as
20:1, a 5-boiler plant can deliver a system turn-down ratio of 100:1 when the boilers are staged to operate
sequentially.
The BMS II is fully compatible with a wide array of Building Automation Systems (BAS) or Energy
Management Systems (EMS) utilizing Modbus Protocol. The BAS or EMS communicates with the BMS II
utilizing a RS232 interface. If the BAS or EMS does not contain a RS232 port, the BMS II can be ordered
with a RS485-to-RS232 Converter which can be easily installed within the BMS II’ wiring compartment.
PHRASES, ABBREVIATIONS & ACRONYMS
The phrases, abbreviations and acronyms used in this document are listed in the following table
Phrases, Abbreviations and Acronyms
Phrase, Abbreviation or
Acronym
Meaning
A (Amp) Ampere
ADDR Address
ALRM Alarm
AUX Auxiliary
BAS Building Automation System, often used interchangeably with EMS (see
below)
Baud Rate Symbol rate, or simply the number of distinct symbol changes (signaling
events) transmitted per second. It is not equal to bits per second, unless
each symbol is 1 bit long.
BCM Boiler Control Module used with AERCO Modulex Series Boilers
BLR Boiler
BMS II AERCO Boiler Management System, Second Generation
BND Band
Bias Resistors A pair of resistors used to force the communication line to a definite logic
state so that noise is not picked up as invalid data during communication.
BLDG (Bldg) Building
C-More Controller
(or Control Box) A control system developed by AERCO and currently used in all Benchmark
and KC1000 Series product lines.
CNTL Control
DIP Dual In-Line Package
DYN Dynamic
EMS Energy Management System; often used interchangeably with BAS
Ethernet A computer networking technology for Local Area Networks (LANs)
FDX Full-Duplex
FLT Fault
GND Ground
HDR Header
HDX Half-Duplex