Aerco Benchmark G-00-711, User Manual

Page: 11 / 79

INSTALLATION
2-5
Figure 2.8
AC Input Terminal Location
2.5.1 ELECTRICAL REQUIREMENTS
The Benchmark boiler is available in one of the
three following electrical configurations:
220/1O/60 ---@ 20 amps
208-230/3O/60---@15 amps
Each Benchmark boiler must be supplied by a
dedicated electrical circuit. No other devices
should be on the same electrical circuit as the
BENCHMARK 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
Benchmark Electrical, Power Wiring Guide, GF-
2060. When wiring, conduit should be run from
the knockouts provided on the control box in
such a manner that it does not interfere with the
removal of any sheet metal covers (see figure
2.9 for knockout location).
2.6 MODE OF OPERATION and FIELD
CONTROL WIRING
The BENCHMARK Boiler is available in several
different modes of operation. While each unit is
factory configured and wired for a particular
mode, some field wiring may be required to
complete the installation. This wiring is typically
run to the Control Box located on the front of the
unit behind the removable Front Door (see Fig.
2.10). Field wiring for each particular mode of
operation is described in the following sections.
Figure 2.9
AC Power Knockout Locations
Figure 2.10
Control Wiring Terminal Location
2.6.1 CONSTANT SETPOINT MODE
No wiring connections other than electrical
supply connections are required for this mode.
Although fault monitoring or enable/disable
interlock wiring can be utilized (see sections 2.7
and 2.8).
TOP OF CONTROL BOX
TERMINAL BLOCK
LOWER PART OF CONTROL BOX
FIELD WIRING TERMINAL