AERCO BMS II BOILER - Manual (Page 5)

CONTENTS
iii
GF-124 – BMS II BOILER MANAGEMENT SYSTEM
Operating & Maintenance Instructions
TABLE OF CONTENTS
CHAPTER 1 - GENERAL INFORMATION .................................................................................................... 1-1
1.1 SAFETY PRECAUTIONS & WARNINGS ................................................................................................... 1-1
1.2 INTRODUCTION ........................................................................................................................................... 1-1
1.3 BMS II GENERAL description ....................................................................................................................... 1-1
1.4 BMS II FEATURES ........................................................................................................................................ 1-2
Simplified Installation and Set-Up .................................................................................................................... 1-2
User-Friendly Control System Interface ............................................................................................................ 1-2
Retention of Menu Option Settings ................................................................................................................... 1-3
Application Flexibility ....................................................................................................................................... 1-3
Sequential or Parallel Operation ........................................................................................................................ 1-3
Accuracy ............................................................................................................................................................ 1-3
Bumpless Transfer ............................................................................................................................................. 1-3
Fault Alarm Surveillance ................................................................................................................................... 1-3
BMS II Programming Via RS232 Port. ............................................................................................................. 1-3
CHAPTER 2 - INSTALLATION ...................................................................................................................... 2-1
2.1 INTRODUCTION ........................................................................................................................................... 2-1
2.2 SITE SELECTION AND MOUNTING .......................................................................................................... 2-1
Mounting the BMS ............................................................................................................................................ 2-1
2.3 GENERAL WIRING REQUIREMENTS ....................................................................................................... 2-2
2.4 POWER WIRING ........................................................................................................................................... 2-3
2.5 SENSOR INSTALLATION AND WIRING ................................................................................................... 2-5
Header Sensor .................................................................................................................................................... 2-5
Return Sensor .................................................................................................................................................... 2-5
Outdoor Air Sensor ............................................................................................................................................ 2-6
2.6 RS485 (MODBUS) WIRING AT THE BMS II .............................................................................................. 2-8
BMS II Bias Switches & Loop Termination Resistors ...................................................................................... 2-8
2.7 RS485 (MODBUS) WIRING, BIAS & TERMINATION AT AERCO BOILERS ........................................ 2-9
RS485 Wiring, Termination& Bias for Benchmark Series and KC1000 Boilers .............................................. 2-9
RS485 Wiring for Modulex Series Boilers ...................................................................................................... 2-15
2.8 SAMPLE RS485 (MODBUS) NETWORK DIAGRAMS ............................................................................ 2-15
2.9 RS232 WIRING AT THE BMS II ................................................................................................................ 2-17
2.10 INTERLOCK WIRING ............................................................................................................................... 2-18
Interlock 1 (INT 1) Wiring .............................................................................................................................. 2-18
Interlock 2 (INT 2) Wiring .............................................................................................................................. 2-18
2.11 SET BACK WIRING .................................................................................................................................. 2-18
2.12 RELAY WIRING ........................................................................................................................................ 2-18
System Start Relay ........................................................................................................................................... 2-19
Fault Alarm Relay ........................................................................................................................................... 2-19
Auxiliary Relay................................................................................................................................................ 2-19
2.13 4 – 20 mA WIRING .................................................................................................................................... 2-19
CHAPTER 3 - OPERATION ............................................................................................................................. 3-1
3.1 INTRODUCTION ........................................................................................................................................... 3-1
3.2 FRONT PANEL OPERATING CONTROLS AND DISPLAYS ................................................................... 3-1
3.3 BMS II MENU STRUCTURE ........................................................................................................................ 3-3
Menu Processing Procedure .............................................................................................................................. 3-3
3.4 OPERATING MENU ...................................................................................................................................... 3-5
HEADER TEMP and PERCENT OF LOAD .................................................................................................... 3-5
HEADER SETPOINT ....................................................................................................................................... 3-5
OUTSIDE AIR TEMP ....................................................................................................................................... 3-5
I/O STATUS ...................................................................................................................................................... 3-6
RETURN TEMP ................................................................................................................................................ 3-6