Runaway plant temperatures in plant_op scheme tests in 3.9.0 / 24.2.0

[jmarrec]

   **  Fatal  ** CheckForRunawayPlantTemps: Simulation terminated because of run away plant temperatures, too hot
   ...Summary of Errors that led to program termination:
   ..... Reference severe error count=1
   ..... Last severe error=Plant temperatures are getting far too hot, check controls and relative loads and capacitie