Defrost termination types - PENN Controls - LIT-12013106 - MR534AFDN - MR534AFDV - Electronic Refrigeration, Defrost, and Multi-Purpose Controller - MR5xx Panel‐Mount Refrigeration and Defrost Controller

MR5 Series Panel Mount Case Controller Product Bulletin

Brand
PENN Controls
Product name
MR5xx Panel‐Mount Refrigeration and Defrost Controller
Document type
Product Bulletin
Document number
LIT-12013106
Revision date
2019-10-08
Product status
Discontinued
Language
English

The MR5 Controller can terminate defrost durations based on time or temperature. Temperature termination applications use a temperature sensor (SN2) that you install on the evaporator.

  • Time-based defrost terminates the defrost cycle when the user-defined maximum defrost duration elapses.
  • Temperature-sensor defrost terminates the defrost cycle when the temperature sensed at the evaporator sensor (SN2) reaches the user-defined defrost termination temperature.
  • Temperature-switch based defrost terminates the defrost cycle when the temperature at the defrost termination switch on the evaporator reaches the switch’s cutout temperature.
Note: The maximum defrost duration overrides both temperature-sensor and temperature-switch defrost termination and terminates the defrost cycle, even if the evaporator does not reach the termination temperature.