Harsco Industrial 1004905923 Installation & Owner's Manual page 43

6.1.1 High Voltage Terminal Block Assignments (HV)
Terminal Label
Number
1 L1 208-240 VAC
2 L2 208-240 VAC
3 N 208-240V
4 120VAC Switched Output
5 120VAC Switched Output
6 3 Way Valve
7 DHW Pump Relay
8 Circ Pump Relay
9 Damper Relay
10 G 208-240 VAC
11 G 208-240 VAC
12 120VAC Switched Output
13 120VAC Switched Output
14 3 Way Valve
15 DHW Pump Relay
16 Circ Pump Relay
17 Damper Relay
18 Master Alarm Relay
19
20 Flame Detected Relay
21
MODU-FIRE
Description
Boiler Supply Power, 230 VAC, 1 ph , 60 Hz
Boiler Supply Power, 230 VAC, 1 ph , 60 Hz
Boiler Neutral Line
Neutral Line for 120VAC Switched Output
Neutral Line for 120VAC Switched Output
Neutral Line for 3 Way Valve
Neutral Line for DHW Pump Relay
Neutral Line for Circ Pump Relay
Neutral Line for Damper Relay
Boiler Ground
Boiler Ground
120VAC Output when boiler power is switched ON
120VAC Output when boiler power is switched ON
120 VAC 3 Way Valve, De-energized when DHW
enabled, Valve is Normally set to Heating Loop
120 VAC Output when DHW is enabled.
120 VAC Output when Central Heating is enabled
120 VAC Output when Boiler is ready to start
Contacts close when boiler is in alarm state
Contacts close when boiler is firing
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Forced Draft Gas-Fired Boiler 2500-3000