E15 Defrost Control

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The Invensys Ranco E15 Defrost Control is an electromechanical device designed to control the removal of frost from the outdoor coil of central system and window unit heat pumps.



  • Timed defrost cycle initiation
  • Only one defrost cycle per time period
  • Temperature termination with backup time termination
  • Selectable defrost cycle frequency
  • Separate low-temperature override tool available for field checking defrost cycle

E15 has a temperature sensing bulb and capillary, a timer motor and a switch mechanism. The remote bulb senses the temperature of the outdoor coil. The timer allows for a defrost cycle only at specified intervals. The switch controls the system defrost functions.