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MACH® Series
Gas-Fired Boiler Parts and Technical Support
Page 37
6.1 WIRING DIAGRAMS
6.1.1 Terminal Block Assignments – High Voltage Circuit (TB2)
Terminal Number Label Description
1 115 VAC LINE
2 115 VAC NEUTRAL
Boiler Supply Power, 115 VAC, 60 HZ, 1 ph, 8 amp
3 115 VAC NEUTRAL Aux. Switched Output
4 115 VAC NEUTRAL Boiler Circ. Pump
5 115 VAC NEUTRAL DHW Circ. Pump
6 GROUND Boiler Supply Ground
7 GROUND
8 GROUND
Aux .Ground
9 115 VAC SW. OUTPUT Aux. Switched Output, Pilot duty only, 1 amp max.
10 115 VAC CIRC. PMP
CONTACTOR
Boiler Circ. Pump, Pilot duty only, 1 amp max.
11 115 VAC DHW PMP
CONTACTOR
DHW Circ. Pump, Pilot Duty only, 1 amp max.
12 MASTER ALARM RELAY
13 MASTER ALARM RELAY
Dry Contacts, 24 VAC max, 1 amp max.
14 THREE WAY VALVE RELAY
15 THREE WAY VALVE RELAY
DHW Dry Contacts, 24 VAC max, 1 amp max.
16 DAMPER RELAY
17 DAMPER RELAY
Combustion Air Damper, Dry Contacts, 24 VAC max, 1 amp
max.