AERCO BMK 1.5 LN Dual Fuel Feb 2013 User Manual

Page 3

PR2: 05/09/12 Page

3 of 162

Benchmark 1.5LN Dual-Fuel Low NOx Boiler

Operation and Maintenance Manual

OMM-0043_0C

GF-121

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288

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 .............................................................................................. 11

2.1 INTRODUCTION ................................................................................................. 11

2.2 RECEIVING THE UNIT ....................................................................................... 11

2.3 UNPACKING ....................................................................................................... 11

2.4 SITE PREPARATION. ......................................................................................... 12

Installation Clearances ............................................................................................. 12

2.4.1

Setting the Unit ........................................................................................................ 13

2.4.2

2.5 SUPPLY AND RETURN PIPING ......................................................................... 14

2.6 CONDENSATE DRAIN ........................................................................................ 14

Exhaust Manifold Condensate Drain ....................................................................... 15

2.6.1

2.7 GAS SUPPLY PIPING ......................................................................................... 16

Gas Supply Specifications. ...................................................................................... 17

2.7.1

Manual Gas Shutoff Valve ....................................................................................... 17

2.7.2

IRI Gas Train Kit ..................................................................................................... 18

2.7.3

2.8 AC ELECTRICAL POWER WIRING .................................................................... 18

Electrical Power Requirements ................................................................................ 18

2.8.1

2.9 MODES OF OPERATION AND FIELD CONTROL WIRING ............................... 19

Constant Setpoint Mode ........................................................................................... 20

2.9.1

Indoor/Outdoor Reset Mode .................................................................................... 20

2.9.2

Boiler Management System Mode ........................................................................... 20

2.9.3

Remote Setpoint and Direct Drive Modes ............................................................... 21

2.9.4

Combination Mode .................................................................................................. 21

2.9.5

2.10 I/O BOX CONNECTIONS .................................................................................. 22

Outdoor Sensor In (1) .......................................................................................... 22

2.10.1

Air Temp. Sensor (2) ........................................................................................... 23

2.10.2

Analog In (3) ........................................................................................................ 23

2.10.3

B.M.S. (PWM) In (4) .......................................................................................... 23

2.10.4

Shield (5).............................................................................................................. 23

2.10.5

mA Out (6) ........................................................................................................... 24

2.10.6

RS-485 Comm (7) ................................................................................................ 24

2.10.7

TxD, RxD (8) ....................................................................................................... 24

2.10.8

VFD/Blower (9) ................................................................................................... 24

2.10.9

Exhaust Switch In (11) ...................................................................................... 24

2.10.10