Owner manual

ManualsBrandsAERCO ManualsEquipmentBMK 1.5 LN July 2011

PR2: 05/09/12 Page 3 of 152

Benchmark 1.5LN Low NOx Boiler

Operation and Maintenance Manual

OMM-0041_0D

GF-120

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 ............................................................................................ 13

2.1 INTRODUCTION ................................................................................................. 13

2.2 RECEIVING THE UNIT ....................................................................................... 13

2.3 UNPACKING ....................................................................................................... 13

2.4 SITE PREPARATION. ......................................................................................... 14

Installation Clearances ............................................................................................. 14 2.4.1

Setting the Unit ........................................................................................................ 15

2.4.2

2.5 SUPPLY AND RETURN PIPING ......................................................................... 16

2.6 CONDENSATE DRAIN ........................................................................................ 16

Exhaust Manifold Condensate Drain ....................................................................... 16 2.6.1

2.7 GAS SUPPLY PIPING ......................................................................................... 17

Gas Supply Specifications. ...................................................................................... 18 2.7.1

Manual Gas Shutoff Valve ....................................................................................... 18 2.7.2

External Gas Supply Regulator ................................................................................ 18 2.7.3

IRI Gas Train Kit ..................................................................................................... 19 2.7.4

2.8 AC ELECTRICAL POWER WIRING .................................................................... 19

Electrical Power Requirements ................................................................................ 20 2.8.1

2.9 MODES OF OPERATION AND FIELD CONTROL WIRING ............................... 21

Constant Setpoint Mode ........................................................................................... 21 2.9.1

Indoor/Outdoor Reset Mode .................................................................................... 21 2.9.2

Boiler Management System Mode ........................................................................... 22 2.9.3

Remote Setpoint and Direct Drive Modes ............................................................... 22

2.9.4

Combination Mode .................................................................................................. 22

2.9.5

2.10 I/O BOX CONNECTIONS .................................................................................. 23

OUTDOOR SENSOR IN (1) ................................................................................ 23 2.10.1

AIR TEMP. SENSOR (2) ..................................................................................... 24 2.10.2

ANALOG IN (3) ................................................................................................... 24 2.10.3

B.M.S. (PWM) IN (4) ........................................................................................... 24 2.10.4

SHIELD (5) ........................................................................................................... 24 2.10.5

mA OUT (6) .......................................................................................................... 25 2.10.6

RS-485 COMM (7) ............................................................................................... 25 2.10.7

TxD, RxD (8) ........................................................................................................ 25 2.10.8

VFD/BLOWER (9) ............................................................................................... 25 2.10.9

EXHAUST SWITCH IN (11) ............................................................................. 25 2.10.10

INTERLOCKS (10, 12) ...................................................................................... 25 2.10.11