AERCO BMS 168 - Manual (Page 11)

Section 3 ______________________________
Installing the
BMS________
Please follow the installation procedure in
the order presented. Incorrect wiring may
damage the unit and void the AERCO
warranty Do not omit steps, and do not
substitute other types of wiring for those
specified. Figure 1 shows a typical BMS
installation.
3.1 M
OUNTING
T
HE
BMS
Use the mounting plate (Figure 2) supplied
with the BMS to securely mount the unit
away from moisture, and at an appropriate
height for easy reading of the display. To
reduce the possibility of electrical noise
entering the system, mount the BMS at
least 6 feet away from electrical devices
such as power panels, high voltage
transformers and transmission lines,
motors, and fluorescent lights.
All wiring and fusing must be in compliance
with the National Electrical Code and with
local electrical codes. Control wiring for the
sensors and communications links must run
in separate conduit and not in the conduit
providing line voltage in order to ensure
immunity from electrical noise.
All wiring should be installed in conduit
leading up to the bottom of the BMS panel.
There are five knock-outs in the bottom of
the panel by which wiring must enter the
BMS.
3.2 G
ENERAL
W
IRING
Shielded, twisted-pair cable should be used
for sensor and communication wiring. This
wiring should be 18 to 24 AWG. Examples
of suitable sensor and communication wire
are: Belden 9841, 8761, 3105A or equiv-
alent. AC power wiring should be 16 to 18
AWG. A BMS wiring diagram is included in
Appendix I. Once mounting is complete and
the BMS is secured in place, loosen the two
captive screws on the wiring cover plate
with a Phillips screwdriver. Feed all wiring
through the knock-outs provided on the
bottom of the panel. All pulse width
modulation (PWM) and RS485 control wires
should be fed through the two knock-outs
furthest to the left.
Shock Hazard!
Extreme caution must be exercised
when connecting power wiring to
the BMS. The external circuit
breaker supplying Line voltage to
the the BMS must be turned off to
avoid electrical shock
Power wiring should be fed through the
right-most knock-out in the bottom of the
panel (Figure 3). The remaining knockouts
are for control wiring located on the middle
terminal block. The terminal blocks can be
detached from the BMS headers to simplify
field wiring.
Once power wiring is completed, apply line
voltage to the BMS, and press the ON key
on the BMS keypad to verify proper
connection. The display should show
INITIALIZING EPROM REV. n where n is
the current EPROM version.
3-1