Refer to the QuickLIT website for the most up-to-date version of this document.
3
Introduction
This document describes the features and functions of the A5xx Series Wall Mount Refrigeration and Defrost
Controller, and provides guidelines and instructions to set up, adjust, and troubleshoot the controller.
Application
The A5xx Series Wall Mount Refrigeration and Defrost Controller provides refrigerated space and defrost control
for low and medium temperature refrigeration applications. The A5xx Controller includes five line-voltage, dry
contact relays to control the compressor, defrost heater or solenoid, evaporator fans, and user-provided alarm
devices. The controller can control two-speed evaporator fans and resistive heat, hot-gas bypass, or passive
defrost.
For information about relay wiring, see the Terminal block and terminal descriptions
section in this document and
refer to the A5xx Series Wall Mount Refrigeration and Defrost Controller Installation Instructions (part no. 24-7664-
3310). The adaptive defrost feature adjusts the defrost schedule to the minimum number of defrost intervals
required to maintain peak efficiency, save energy, and maintain consistent space temperature. The A5xx Controller
includes an IP65 enclosure with holes in the enclosure base for wall and surface mounting. You can also order an
optional DIN rail mounting kit (part no. BKT524-1K).
IMPORTANT: Use the A5xx Series Wall Mount Refrigeration and Defrost Controller only as an operating
control. Where failure or malfunction of the A5xx Controller could lead to personal injury or property damage to
the controlled equipment or other property, additional precautions must be designed into the control system.
Incorporate and maintain other devices, such as supervisory or alarm systems or safety or limit controls,
intended to warn of or protect against failure or malfunction of the A5xx Controller.
IMPORTANT : Utiliser ce A5xx Series Wall Mount Refrigeration and Defrost Controller uniquement en tant que
dispositif de contrôle de fonctionnement. Lorsqu'une défaillance ou un dysfonctionnement du A5xx Régulateur
risque de provoquer des blessures ou d'endommager l'équipement contrôlé ou un autre équipement, la
conception du système de contrôle doit intégrer des dispositifs de protection supplémentaires. Veiller dans ce
cas à intégrer de façon permanente d'autres dispositifs, tels que des systèmes de supervision ou d'alarme, ou
des dispositifs de sécurité ou de limitation, ayant une fonction d'avertissement ou de protection en cas de
défaillance ou de dysfonctionnement du A5xx Régulateur.
A5xx Series Wall Mount Refrigeration and Defrost
Controllers
Technical Bulletin
A525
LIT No. 12012405
Issued December 2018
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