Harsco Industrial 1004905923 Installation & Owner's Manual page 44

6.1.2 Terminal Block Assignments – Low Voltage Circuit (TB1)
Terminal
Number
1 Enable / Disable
2
3 Auxiliary Low Water Cutoff External Limit, Contact Closure.
4
5 External Interlock
6
7 Outdoor Temp Sensor
8
9 DHW Stat or Sensor
10
11 Header Temp Sensor
12
13 DHW Flow Switch
14
15 0-10V Analog Input
16 0V Analog Input
17 For Future Use
18 For Future Use
19 MODBUS
20 MODBUS
21 CASCADE A TO A
22 CASCADE B TO B
Label
Boiler Enable, Contact Closure.
DO NOT ENERGIZE.
DO NOT ENERGIZE.
External Limit, Contact Closure.
DO NOT ENERGIZE.
Outdoor Temperature Sensor Circuit
Domestic Hot Water Thermostat (contact closure) or
Temperature Sensor
Header Temperature Sensor
DHW Flow Switch (contact closure)
0-10VDC Remote Control Input
0VDC Remote Control Common
®
COM 1A
®
COM 1B
®
MODU-FIRE Forced Draft Gas-Fired Boiler 2500-3000
Description
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