Starting or stopping a Defrost Cycle using the binary input (BIN) - 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

About this task

In this task, you start or stop a Defrost Cycle using the Binary Input (BIN).


Connect a momentary contact switch between BIN and COM on the T3 terminal block.
Each time the momentary contact switch is pressed, the defrost cycle starts or stops depending on whether the defrost cycle is running or not. See Figure 1.
Figure 1. Starting and stopping a dFT: behavior using SdF parameter and momentary contact switch