Field Control Wiring - Benchmark BMK 1500 User Manual

2.10 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 Control system 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 I/O board is located in the upper-left portion on
the front of the unit as shown in Figure 2-11. The I/O board terminal strip connections are shown
in Figure 2-12. 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.
Refer to the wiring diagram provided below the I/O Box (Figure 2-12) when making all wiring
connections.
Figure 2-11: Input/Output (I/O) Box Location
Use Figure 2-12 to determine the functions of the I/O PCB
connections. Do not use the silkscreened labels on the PCB itself,
as these may not match the function names.
There is a diagram of the connection functions on the cover of the
I/O Box as well.
DO NOT make any connections to the I/O Box terminals labeled
"NOT USED". Attempting to do so may cause equipment damage.
Page 26 of 184
Benchmark 1500 - 2000 Boilers
CHAPTER 2 – INSTALLATION
I/O PCB
BOARD
NOTE
CAUTION
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
TERMINAL STRIPS
OMM-0097_0C
GF-142