Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 2 – INSTALLATION
OMM-0121_D • GF-205 • 5/9/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 34 of 122
2.11 FIELD CONTROL WIRING
Each unit is fully wired from the factory with an internal operating control system. No field control
wiring is required for normal operation. However, the C-More Controller used with all
Benchmark units does allow for some additional control and monitoring features. Wiring
connections for these features are made on the Input/Output (I/O) board located behind the
removable front panel assembly of the unit. The location of the I/O board is shown in Figure 2-
10. The I/O board terminal strip connections are shown in Figure 2-11. All field wiring is installed
from the rear of the panel by routing the wires through one of the four bushings provided on the
sides of the I/O board.
Figure 2-10: Input/Output (I/O) Box Location
NOTE:
Use Figure 2-11 to determine the functions of the I/O board connections. Do not use the
silkscreened label on the I/O board itself, as some labels may not match the functions. There is
also a diagram of the connection functions on the cover of the I/O Box.
WARNING!
DO NOT make any connections to the I/O Box terminals labeled “NOT USED”. Attempting to
do so may cause equipment damage.
I/O BOARD
TERMINAL STRIPS
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