AERCO BMK 3.0 LN Dual Fuel June 2010 - Manual (Page 17)

INSTALLATION
2-7
Figure 2-9
AC Terminal Block Configurations
2.9 MODES OF OPERATION AND FIELD
CONTROL WIRING
The Benchmark 3.0 Dual-Fuel 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 2-10) 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.
TERMINAL
STRIPS
LOWER RIGHT CORNER
OF FRONT PANEL
Figure 2-10.
Input/Output (I/O) Box Location
Refer to the wiring diagram provided on the
cover of the I/O Box (Figure 2-11) when making
all wiring connections.
Brief descriptions of each mode of operation,
and their wiring requirements, are provided in
the following paragraphs. Additional information
concerning field wiring is provided in paragraphs
2.9.1 through 2.9.9. Refer to Chapter 5 for
detailed information on the available modes of
operation.