Benchmark 2.0 LN Installation, Operation & Maintenance Manual
OMM-0046_0J
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
Page
3
of
168
GF-123
Ph.: 800-526-0288
06/18/2015
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 ............................................................................................... 19
2.6.1 Exhaust Manifold Condensate Drain .......................................................................................... 20
2.7 GAS SUPPLY PIPING....................................................................................................................... 21
2.7.1 Gas Supply Specifications. ......................................................................................................... 22
2.7.2 Manual Gas Shutoff Valve .......................................................................................................... 22
2.7.3 External Gas Supply Regulator .................................................................................................. 22
2.7.4 IRI Gas Train Kit ......................................................................................................................... 23
2.8 AC ELECTRICAL POWER WIRING ................................................................................................. 23
2.8.1 Electrical Power Requirements ................................................................................................... 23
2.9 MODES OF OPERATION AND FIELD CONTROL WIRING ............................................................ 24
2.9.1 Constant Setpoint Mode ............................................................................................................. 25
2.9.2 Indoor/Outdoor Reset Mode ....................................................................................................... 25
2.9.3 Boiler Management System Mode.............................................................................................. 25
2.9.4 Remote Setpoint and Direct Drive Modes .................................................................................. 25
2.9.5 Combination Mode ...................................................................................................................... 26
2.10 I/O BOX CONNECTIONS ............................................................................................................... 26
2.10.1 Outdoor Sensor In
(1)
............................................................................................................. 27
2.10.2 Air temp. Sensor
(2)
................................................................................................................ 27
2.10.3 Analog In
(3)
............................................................................................................................ 27
2.10.4 B.M.S. (PWM) IN
(4)
............................................................................................................... 28
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
2.12 COMBUSTION AIR ......................................................................................................................... 30
2.12.1 Combustion Air From Outside the Building .............................................................................. 30
2.12.2 Combustion Air From Inside The Building ................................................................................ 30
2.12.3 Sealed Combustion .................................................................................................................. 30
2.12.4 Ducted Combustion Air ............................................................................................................. 31
2.12.5 Temporary Combustion Air Filtering During Construction ........................................................ 31
2.13 BENCHMARK PUMP RELAY OPTION .......................................................................................... 32