INSTALLATION
2-5
2.7.3 IRI Gas Train Kit
The IRI gas train is an optional gas train
configuration which is required in some areas for
code compliance or for insurance purposes.
The IRI gas train is factory pre-piped and wired.
See Appendix F, Drawing AP-A-843
for details.
2.8 AC ELECTRICAL POWER WIRING
The AERCO Benchmark 2.0LN Electrical Power
Wiring Guide, GF-2060LN, must be consulted
prior to connecting any AC power wiring to the
unit. External AC power connections are made
to the unit inside the Power Box on the front
panel of the unit. Remove the front door of the
unit to access the Power Box mounted directly
above the Control Box. Loosen the four Power
Box cover screws and remove cover to access
the AC terminal connections inside the Power
Box (Figure 2-7).
NOTE
All electrical conduit and hardware must
be installed so that it does not interfere
with the removal of any unit covers, inhibit
service/maintenance, or prevent access
between the unit and walls or another
unit.
Figure 2-7
AC Input Terminal Block Location
2.8.1 Electrical Power Requirements
The AERCO Benchmark 2.0LN Boiler accepts
120 VAC, single-phase, 60 Hz @ 20A. The
Power Box contains a terminal block as shown
in Figure 2-8. In addition, a wiring diagram
showing the required AC power connections is
provided on the front cover of the Power Box.
Each Boiler must be connected to a dedicated
electrical circuit. NO OTHER DEVICES
SHOULD BE ON THE SAME ELECTRICAL
CIRCUIT AS THE BOILER. A means for
disconnecting AC power from the unit (such as a
service switch) must be installed near the unit
for normal operation and maintenance. All
electrical connections should be made in
accordance with the National Electrical Code
and/or with any applicable local codes.
For electrical power wiring diagrams, see the
AERCO Benchmark 2.0LN Electrical Power
Wiring Guide, (GF-2060LN).
Figure 2-8
AC Terminal Block Configurations
2.9 MODES OF OPERATION AND
FIELD CONTROL WIRING
The Benchmark 2.0LN Boiler is available in
several different modes of operation. While
each unit is factory configured and wired for its
intended mode, some additional field wiring may
be required to complete the installation. This
wiring is typically connected to the Input/Output
(I/O) Box located on the lower portion of the unit
front panel (Figure 2-9) behind the removable
front door.
To access the I/O Box terminal strips shown in
Figure 2-10, loosen the four cover screws and
remove the cover. All field wiring is installed
from the rear of the panel by routing the wires
through one of the four bushings provided.
Refer to the wiring diagram provided on the
cover of the I/O Box (Figure 2-10) when making
all wiring connections.
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