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Installation & Operation Manual
7 Field wiring (continued)
1 ALARM
LBL20052 REV B
30 SHIELD GND
MOD BUS
0 - 10V INPUT
2 CONTACTS
3 RUN TIME
4 CONTACTS
5 LOUVER
6 PROVING
8 FLOW SWITCH
10 FLOW SWITCH
29 A
26 SENSOR
25 TANK
24 SENSOR
23 OUT DOOR
22 SENSOR
21 SYSTEM
20 (-)
19 (+)
18 SHIELD GND
17 B
16 A
15 SHIELD GND
14 W
13 R
11 TANK
12 THERMOSTAT
28 B
27 SHIELD GND
CASCADE
ENABLE
A
B
A
B
A
B
BUILDING
MANAGEMENT
SYSTEM
LOUVER
PROVING
SWITCH
TANK
THERMOSTAT
ENABLING DEVICE
SYSTEM SENSOR
OUTDOOR SENSOR
TANK SENSOR
SHIELD
SHIELD
FROM PREVIOUS BOILER
TO NEXT BOILER
SHIELD
HEAT
EXCHANGER 2
FLOW SWITCH
HEAT
EXCHANGER 1
FLOW SWITCH
A
B
SHIELD
MODBUS COMMUNICATION BUS
TO NEXT BOILER
9 HEX 1
7 HEX 2
Figure 7-3 Low Voltage Field Wiring Connections