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I am not real familiar with the hydronic system but I suppose the sequencer is enerigizing a solenoid valve on the pump.
In that case the M3 terminal would indeed go to the pump solenoid to send power to the solenoid the same as it would to a heating element.
Now one thing we would want to verify is if the solenoid is high or low voltage.If low voltage (24v), then we would want to take the low voltage wire that goes to sequencer coil to the valve.Do you have any pictures or wiring diagrams?
Not familiar enough with that to know for sur.I will open to other experts who may be.