User Manual

MC2: 04/23/13 Page 3 of 144

GF-131

AERCO Control System (ACS)

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288

Installation, Operation, and Maintenance Manual

OMM-0081_0D

Table of Contents

FOREWARD ................................................................................................................... 9

PHRASES, ABBREVIATIONS & ACRONYMS .......................................................... 9

1. ACS GENERAL INFORMATION ........................................................................... 11

1.1 SAFETY PRECAUTIONS AND WARNINGS .................................................. 11

1.2 INTRODUCTION .............................................................................................. 11

1.3 ACS GENERAL DESCRIPTION ...................................................................... 11

1.4 ACS FEATURES ............................................................................................. 12

1.4.1 Simplified Installation and Set-Up ........................................................... 12

1.4.2 User-Friendly Control System Interface ................................................. 12

1.4.3 Retention of Menu Option Settings ......................................................... 13

1.4.4 Application Flexibility .............................................................................. 13

1.4.5 Sequential or Parallel Operation ............................................................. 13

1.4.6 Accuracy ................................................................................................ 13

1.4.7 Bumpless Transfer ................................................................................. 13

1.4.8 Fault Alarm Surveillance ........................................................................ 13

1.4.9 ACS Programming Via RS232 Port. ....................................................... 13

2. ACS INSTALLATION ............................................................................................. 15

2.1 INTRODUCTION .............................................................................................. 15

2.2 SITE SELECTION AND MOUNTING .............................................................. 15

2.2.1 Mounting the ACS .................................................................................. 15

2.3 SITE SELECTION AND MOUNTING .............................................................. 16

2.4 POWER WIRING ............................................................................................. 17

2.5 SENSOR INSTALLATION AND WIRING ........................................................ 18

2.5.1 Header Sensor Installation ..................................................................... 19

2.5.2 Return Sensor Installation ...................................................................... 19

2.5.3 Outdoor Air Sensor Installation............................................................... 20

2.6 RS485 (MODBUS) WIRING AT THE ACS ...................................................... 22

2.6.1 ACS Bias Switches & Loop Termination Resistors ................................. 22

2.7 RS485 (MODBUS) WIRING, BIAS, AND TERMINATION AT AERCO

BOILERS ................................................................................................................... 23

2.7.1 RS485 Wiring, Termination& Bias for Benchmark Series and KC1000 Boilers . 23

2.7.2 RS485 Wiring for Modulex Series Boilers .............................................. 29

2.8 SAMPLE RS485 (MODBUS) NETWORK DIAGRAMS ................................... 30

2.9 RS485 WIRING AT THE ACS ......................................................................... 31