Owner manual

PR2: 04/22/13 Page 3 of 160
Benchmark 2.0LN Dual-Fuel Low NOx Boiler
Operation and Maintenance Manual
OMM-0052_0E
GF-127
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 .......................................................................................... 11
Installation Clearances ............................................................................................. 12 2.4.1
Setting the Unit ........................................................................................................ 12 2.4.2
2.5 SUPPLY AND RETURN PIPING ......................................................................... 13
2.6 CONDENSATE DRAIN AND PIPING .................................................................. 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 ..................................................................................................... 17 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 ........................................................................................... 19 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 ............................................................... 20
2.9.4
Combination Mode .................................................................................................. 20 2.9.5
2.10 I/O BOX CONNECTIONS .................................................................................. 21
Outdoor Sensor In (1) .......................................................................................... 21 2.10.1
Air Temp. Sensor (2) ........................................................................................... 22 2.10.2
Analog In (3) ........................................................................................................ 22 2.10.3
B.M.S. (PWM) In (4) .......................................................................................... 22 2.10.4
Shield (5).............................................................................................................. 23 2.10.5
mA Out (6) ........................................................................................................... 23 2.10.6
RS-485 Comm (7) ................................................................................................ 23 2.10.7
TxD, RxD (8) ....................................................................................................... 23 2.10.8
VFD/Blower (9)................................................................................................... 23 2.10.9
Exhaust Switch In (11) ...................................................................................... 23 2.10.10