AERCO BMS II BOILER - Manual (Page 15)

INSTALLATION
2-3
WARNING
THE BMS II CAN BE POWERED BY SINGLE-PHASE AC
VOLTAGES RANGING FROM 85 TO 265 VAC. THEREFORE,
EXERCISE EXTREME CARE WHEN CONNECTING POWER
WIRING TO THE UNIT. ENSURE THAT THE EXTERNAL
CIRCUIT BREAKER SUPPLYING LINE VOLTAGE TO THE BMS
II IS TURNED OFF TO AVOID SEVERE ELECTRICAL SHOCK.
2.4 POWER WIRING
Use 14 to 18 AWG wire for AC power connections and proceed as follows:
1. Feed the power wiring through the right-most knock-out in the bottom of the panel enclosure (Figure
2-2).
2. Connect the Line (black), Neutral (white) and Ground (green) wire leads to the L, N and (GND)
terminals. The terminal blocks can be detached from the BMS II headers if necessary to simplify field
wiring connections.
3. Following completion of power wiring, turn on the external circuit breaker or switch and apply power
to the unit. The BMS II display will momentarily show:
AERCO BMSII
REV X.XX
(Where: X.XX represents the revision level of the installed BMS II software)
4. Next, since the Header Sensor is not yet installed, the display will then show:
HEADER TEMP
SENSOR ERROR
The red FAULT LED indicator will also light and a fault message will alternately be displayed as
follows:
HEADER SENSOR
ERROR
5. Press the ON-OFF key on the keypad. The green ON LED indicator will light and the BMS II display
will continue to show the above message.
6. After verifying proper power connections, press the ON-OFF key. The ON LED will turn off.
7. Turn off the external power switch and/or circuit breaker. The BMS II display will go blank.
8. DO NOT apply power to the BMS II until all of the required external connections described in
paragraphs 2.5 through 2.11 have been completed.