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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 2 – INSTALLATION
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.
BMK 750/1000
BMK 1500/2000/2500-3000
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.
OMM-0121_D • GF-205 • 5/9/2019
I/O BOARD
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
TERMINAL STRIPS
Page 34 of 122
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