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MACH® Series
Gas-Fired Boiler Parts and Technical Support
Page 38
6.1.1a Terminal Block Assignments – Low Voltage Circuit (TB1)
Terminal Number Label Description
1 HEAT REQUEST
2 HEAT REQUEST
Boiler Enable, Contact Closure.
DO NOT ENERGIZE.
3 INTERLOCK JUMPER
4 INTERLOCK JUMPER
External Limit (auto reset), Contact Closure.
DO NOT ENERGIZE.
5 DHW TEMP. SENSOR
6 OUTDOOR TEMP SENSOR Thermistor - factory option.
7 CIRC. PMP PWM SIGNAL Pulse Width Modulation.
8 COMMON Common to be used with 5, 6, 7, and 10 when used.
9 COMMON Common to be used with 5, 6, 7, and 10 when used.
10 O-10 V ANAL. INPUT CONTROL Remote control of firing rate or setpoint.
11 +10 VOLT Regulated 10V output.
12 COM 1 RS-485 port A.
13 COM 2 RS-485 port B.
14 OUTSIDE TEMP W/ FILTER Thermistor - factory option.
15 OUTSIDE TEMP W/ FILTER Thermistor - factory option.
16 SPARE
17 SPARE