Table of Contents
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Benchmark 2.0LN Dual-Fuel Low NOx Boiler
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
2.4.1
Installation Clearances ............................................................................................. 12
2.4.2
Setting the Unit ........................................................................................................ 12
2.5 SUPPLY AND RETURN PIPING ......................................................................... 13
2.6 CONDENSATE DRAIN AND PIPING .................................................................. 14
2.6.1
Exhaust Manifold Condensate Drain ....................................................................... 15
2.7 GAS SUPPLY PIPING ......................................................................................... 16
2.7.1
Gas Supply Specifications. ...................................................................................... 17
2.7.2
Manual Gas Shutoff Valve....................................................................................... 17
2.7.3
IRI Gas Train Kit ..................................................................................................... 17
2.8 AC ELECTRICAL POWER WIRING .................................................................... 18
2.8.1
Electrical Power Requirements ................................................................................ 18
2.9 MODES OF OPERATION AND FIELD CONTROL WIRING ............................... 19
2.9.1
Constant Setpoint Mode ........................................................................................... 19
2.9.2
Indoor/Outdoor Reset Mode .................................................................................... 20
2.9.3
Boiler Management System Mode........................................................................... 20
2.9.4
Remote Setpoint and Direct Drive Modes ............................................................... 20
2.9.5
Combination Mode .................................................................................................. 20
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
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
PR2: 04/22/13
Operation and Maintenance Manual
Table of Contents
GF-127
OMM-0052_0E
Page 3 of 158
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