Penn A5 Series Installation Instructions

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Refer to the QuickLIT website for the most up-to-date version of this document.
A52x Series Refrigeration Controller with Adaptive Defrost Installation Instructions
Application
The A52x Series Refrigeration Controller with Adaptive Defrost provides refrigerated space control and defrost
control for medium and low temperature refrigeration applications.
The A525 Controller has five integral line-voltage, dry-contact relays to control the compressor, defrost heater or
solenoid, evaporator fans, and user-provided alarm devices. The controller can control resistive heat, hot-gas
bypass, or passive defrost. The controller can also control two-speed evaporator fans. The A524 Controller has
four integral line-voltage relays and controls the same devices as the A525 Controller. The LO-SPD AUX relay is
not available on the A524 Controller, which controls a single speed evaporator fan only.
The adaptive defrost feature allows the controller to adjust the defrost schedule to the minimum number of defrost
intervals required to maintain peak efficiency, save energy, and maintain consistent space temperature.
The A52x
Controller has an IP65 enclosure with holes in the enclosure base for wall-surface mounting. An optional DIN rail
mount kit (
Part No. BKT524-1K) is also available.
Refer to the A52x Series Refrigeration Controller with Adaptive Defrost Technical Bulletin (LIT-12012405) for more
details on setting up, operating, and troubleshooting the A52x Controller. You can access and download the A52x
Controller Technical Bulletin from QuickLIT.
Parts Included
Each A52x Series Controller includes two Johnson Controls/PENN® A99B Series Temperature Sensors. See
Sensor Wiring
on page 6, Table 12 on page 11, and refer to the A99B Series Temperature Sensors Product/
Technical Bulletin (LIT-125186) for more detailed installation procedures and technical specifications.
IMPORTANT: Use of this product is subject to and constitutes your agreement to the End User License
Agreement set forth at www.johnsoncontrols.com/buildings/legal/digital Part No. 24-07664-03310
IMPORTANT: Use this A52x Series Refrigeration Controller only as an operating control. Where failure or
malfunction of the A52x 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 A52x Controller.
IMPORTANT : Utiliser ce A52x Series Refrigeration Controller uniquement en tant que dispositif de contrôle de
fonctionnement. Lorsqu'une défaillance ou un dysfonctionnement du A52x 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 A52x Régulateur.
A52x Series Refrigeration Controller with Adaptive Defrost
Installation Instructions
A524/A525
Part No. 24-07664-03310 Rev. C
Issued April 2018

Penn A5 Series Specifications

General

Brand	Penn
Model	A5 Series
Category	Controller
Language	English