AERCO BMS II BOILER - Manual (Page 26)

INSTALLATION
2-14
mA OUT
RS-485
COMM.
+
-
+
-
ANALOG IN
SENSOR COMMON
OUTDOOR SENSOR IN
REMOTE INTL'K IN
B.M.S. (PWM) IN
SHIELD
+
-
+
-
AUX SENSOR IN
NOT USED
EXHAUST SWITCH IN
DELAYED INTL'K IN
FAULT RELAY
120 VAC, 5A, RES
AUX RELAY
120 VAC, 5A, RES
G
NOT USED NOT USED
NC
COM
NO
NC
COM
NO
NOT USED
NOTE
DO NOT TERMINATE THE SHIELDS OF THE
RS485 COMM LEADS TO THE GROUND (G) TERMINAL.
THE SHIELDS MUST BE TERMINATED AT THE
SOURCE ENDS ONLY. CONNECT THE SHIELDS
OF THE INCOMING AND OUTGOING RS485 LEADS
TOGETHER.
DO NOT USE THESE
TERMINALS
CONNECT 120 OHM, 1/2 WATT
RESISTOR BETWEEN + AND –
RS485 COMM TERMINALS ON
LAST C-MORE CONTROL BOX
KC1000
REMOVE SHEET METAL
COVER TO ACCESS I/O BOX
I/O BOARD
METHOD 2 – TERMINATION ACTIVATED AT I/O BOX
Figure 2-8. RS485 (Modbus) Wiring For KC1000 Boilers (Sheet 2 of 2)