Control behavior when starting or stopping an automatically enabled Defrost Off-Cycle - PENN Controls - A421ABD - A421AED - Electronic Temperature Control - A421 Off‐Cycle Defrost Model

A421 Series Electronic Temperature Controls with Off-Cycle Defrost Installation Guide

Product name
A421 Off‐Cycle Defrost Model
Document type
Installation Guide
Document revision
Revision date

The following behavior is enforced:

  • At power up, the initial Defrost Interval (dI) does not initiate a Defrost Cycle Time (dFt).
  • A defrost cycle occurs at the beginning of each subsequent defrost interval.
  • You can start or stop a defrost cycle using the SdF parameter or binary input (BIN).
  • Starting a defrost cycle terminates the defrost interval (dI) and starts a new defrost cycle.
  • Stopping a defrost cycle terminates the dFt and continues the current defrost interval (dI) until the start of the next regular dI and defrost cycle.