a three-input one-output open feedwater heater
(Forall (?Self ?Time)
(<=> (Active ?Time 3-1-Open-Feedwater-Heater ?Self)
(And (3-1-Open-Feedwater-Heater ?Self)
(Active ?Time 3-1-Port-Thermal-Component ?Self)
(Active ?Time Open-Feedwater-Heater ?Self))))