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Installation & Operation Manual
7 Field wiring
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
ALARM
CONTACTS
RUN TIME
CONTACTS
TANK
THERMOSTAT
ENABLE
LOUVER
PROVING
LOUVER
RELAY
AUX
SWITCH 1
AUX
SWITCH 2
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
CASCADE
SYSTEM PUMP
IN
BMS
IN
OUTDOOR
SENSOR
SENSOR
SENSOR
SENSOR
TANK
SYSTEM SUPPLY
SYSTEM RETURN
BOILER PUMP
OUT
OUT
RATE
MODBUS
SHIELD
SHIELD
B
A
-
+
+
-
-
-
+
+
SHIELD
SHIELD
B
A
BUILDING
MANAGEMENT
SYSTEM
TANK
THERMOSTAT
ENABLING
DEVICE
LOUVER
PROVING
SWITCH
LOUVER
RELAY
AUX
SWITCH 1
AUX
SWITCH 2
FROM PREVIOUS BOILER
TO NEXT BOILER
A
B
B
A
SHIELD
SHIELD
0-10V INPUT
SYSTEM PUMP
OUTDOOR SENSOR
TANK SENSOR
SYSTEM SUPPLY SENSOR
SYSTEM RETURN SENSOR
0-10V OUTPUT
BOILER PUMP
MODBUS
COMMUNICATION BUS
SHIELD
A
B
B
A
SHIELD
Figure 7-3 Low Voltage Field Wiring Connections