AERCO BMS II BOILER - Manual (Page 25)

INSTALLATION
2-13
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.
C32
Q1
C41
C29
C20
C31
C35
C47
C44
R29 R30
HB
C53
R74 C4
C3
U1
CBS3
R69
C50
R67
R68
Y1
C52 C57
J2
CR1
C1
C5
U17
R76
C51
R71
R73 R72
C2
JP 2
R70
U21
C56
C6
C64
R75
J4
U13 U20
C59
C49 C48
C61
CBS4
U14
R78
R79
DS5 DS4
RS232
TX RX
C60 C62
C46
U19
U15
U18
C58
C55
C54
DS3
R77
Y2
U16
C63
B1
R16
U11 R66
U10
R15 C45
R14
C19
C16
R32 R17
C18
R18
C34
U4
R33
C27
R31
C26
U6 R47
C39
R55
U2
R1
C7
U8
R53
C36 R81
R45 R44
C37
R48
S2
R46
C38
R49
J1
BIAS 1 TERM BIAS 2
R50 C40
CBS1
RS485
C11
J3
R51
R9
BH1
U3
R10
C12
C13
DS 1
RS485
TX RX
R52
U7 DS 2
R54
R5
C10 R7
R8
R6
S1
R11
R65 C9
R34
R12
R13
C14
C15
R36
C28 C25
R35
C23
R37 R38
C30 U5
C43
C65 R2
R3
R58 C8 R62 R4
R80
OFF = VOLT
CURR/VOLT
ON = CURR
Q2 R57 C66
R64
R56
CBS2
R25
U12
R20
U9
R19 C17
R27
R23
R21
R22
C21
R28 R26
C24
R60
R41
R40
R24
R39
C22
R42 R43
C33
R61
R63
C42
R59
CR2
PMC BOARD
ACTIVATE BIAS1, BIAS2 & TERM
DIP SWITCHES ON PMC BOARD
OF LAST C-MORE CONTROL BOX
DO NOT USE THESE
TERMINALS
KC1000
REMOVE SHEET METAL
COVER TO ACCESS I/O BOX
RS485 COMM CONNECTIONS
(See NOTE)
I/O BOARD
METHOD 1 – BIAS & TERMINATION ACTIVATED AT C-MORE PMC BOARD
Figure 2-8. RS485 (Modbus) Wiring For KC1000 Boilers (Sheet 1 of 2)