Compressor and evaporator fan start delays - 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

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

To control the compressor and evaporator fan operation, the MR5 Controller uses the following time delay features:

  • The anti-short cycle delay (ASD) holds the compressor relay off or open after the relay cycles off. The compressor relay cannot turn on or close again until the ASD elapses, which protects the compressor from short cycling. Select from 0 minutes to 12 minutes for the ASD.
  • The evaporator fan drip-time delay holds the compressor relay and evaporator fan relays off or open after the defrost duration terminates, which allows any remaining moisture on the evaporator to drip off. Select from 0 minutes to 10 minutes for the evaporator drip-time fan delay.
  • The evaporator fan time delay works with the evaporator fan temperature delay. The evaporator fan time delay holds the evaporator fan relays off or open after the defrost termination, drip-time delay, and compressor start in cooling mode. The evaporator coil cools down and freezes any moisture before the evaporator fans start. This delay reduces the moisture and warm air that blows into the refrigerated space. The evaporator fan delay is an adjustable time delay after a defrost cycle. Select from 0 minutes to 15 minutes for the evaporator fan time delay.