AERCO BMK 2.0 LN Natural Gas (SN G-11-1861 and above) - Manual (Page 3)

GF-123
Benchmark 2.0LN Boiler
OMM-0046_0E Installation, Operation & Maintenance Manual
PR1 08/20/12 AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288 Page 3 of 170
TABLE OF CONTENTS
CHAPTER 1: SAFETY PRECAUTIONS ...................................................................................................... 9
1.1 WARNINGS & CAUTIONS ................................................................................................................. 9
1.2 EMERGENCY SHUTDOWN ............................................................................................................ 10
1.3 PROLONGED SHUTDOWN ............................................................................................................ 10
CHAPTER 2. INSTALLATION .............................................................................................................. 15
2.1 INTRODUCTION .............................................................................................................................. 15
2.2 RECEIVING THE UNIT .................................................................................................................... 15
2.3 UNPACKING .................................................................................................................................... 15
2.4 SITE PREPARATION. ...................................................................................................................... 16
2.4.1 Installation Clearances .......................................................................................................... 16
2.4.2 Setting the Unit ...................................................................................................................... 17
2.5 SUPPLY AND RETURN PIPING ...................................................................................................... 18
2.6 CONDENSATE DRAIN AND PIPING ............................................................................................... 18
2.6.1 Exhaust Manifold Condensate Drain .................................................................................... 19
2.7 GAS SUPPLY PIPING ...................................................................................................................... 20
2.7.1 Gas Supply Specifications. ................................................................................................... 21
2.7.2 Manual Gas Shutoff Valve .................................................................................................... 21
2.7.3 External Gas Supply Regulator ............................................................................................. 21
2.7.4 IRI Gas Train Kit .................................................................................................................... 22
2.8 AC ELECTRICAL POWER WIRING ................................................................................................ 22
2.8.1 Electrical Power Requirements ............................................................................................. 22
2.9 MODES OF OPERATION AND FIELD CONTROL WIRING ........................................................... 23
2.9.1 Constant Setpoint Mode ....................................................................................................... 24
2.9.2 Indoor/Outdoor Reset Mode ................................................................................................. 24
2.9.3 Boiler Management System Mode ........................................................................................ 24
2.9.4 Remote Setpoint and Direct Drive Modes ............................................................................ 25
2.9.5 Combination Mode ................................................................................................................ 25
2.10 I/O BOX CONNECTIONS ............................................................................................................... 26
2.10.1 OUTDOOR SENSOR IN (1) .............................................................................................. 26
2.10.2 AIR TEMP. SENSOR (2) ................................................................................................... 27
2.10.3 ANALOG IN (3) .................................................................................................................. 27
2.10.4 B.M.S. (PWM) IN (4) .......................................................................................................... 27
2.10.5 SHIELD (5) ......................................................................................................................... 28
2.10.6 mA OUT (6) ........................................................................................................................ 28
2.10.7 RS-485 COMM (7) ............................................................................................................. 28
2.10.8 TxD, RxD (8) ...................................................................................................................... 28
2.10.9 VFD/BLOWER (9) .............................................................................................................. 28
2.10.10 EXHAUST SWITCH IN (11) ............................................................................................. 28
2.10.11 INTERLOCKS (10, 12) ..................................................................................................... 28
2.10.11.1 REMOTE INTERLOCK IN (10)
................................................................................ 29
2.10.11.2 DELAYED INTERLOCK IN (12)
............................................................................... 29
2.10.12 FAULT RELAY (13) .......................................................................................................... 29
2.10.13 AUXILIARY RELAY CONTACTS (14) .............................................................................. 29
2.11 FLUE GAS VENT INSTALLATION ................................................................................................. 29