Penn A421ABC-03C User Manual

A421 Series Standard Electronic Temperature Controls Installation Instructions
Refer to the QuickLIT website for the most up-to-date version of this document.
1
Applications
The A421 Series Electronic Temperature Controls are
single-stage, electronic temperature controls with a
single-pole, double-throw (SPDT) output relay.
A421 controls feature a backlit LCD with adjustable
brightness and three-button touchpad interface that
can be set up to restrict user adjustments. An LED
indicates the output relay's On/Off status.
A421 controls have simple On and Off temperature
settings for heating or cooling, an adjustable anti-short
cycle delay, temperature setback, and sensor offset
capability. The temperature control range is
40 to 212°F or -40 to 100°C.
The A421 controls are available either in Type1
(NEMA), IP20 (CE), high-impact plastic enclosures
suitable for surface or DIN rail mounting (Figure 1)
or in Type 4X (NEMA), IP66 (CE) watertight, corrosion
resistant surface mount enclosures (Figure 2).
Dimensions
IMPORTANT: Use this A421 Series Electronic
Temperature Control only as an operating control.
Where failure or malfunction of the A421 control 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 A421 control.
IMPORTANT: Utiliser CE A421 Series Electronic
Temperature Control uniquement en tant que
dispositif de régulation. Lorsqu'une défaillance ou un
dysfonctionnement du A421 control 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
A421 control.
Figure 1: A421 Control with Type 1 (NEMA),
IP20 Enclosure Dimensions, in. (mm)
Figure 2: A421 Control with Type 4X (NEMA),
IP66 Enclosure Dimensions, in. (mm)
A421 Series Standard Electronic Temperature
Controls
Installation Instructions
A421ABC-x, A421AEC-x,
A421GBF-x, A421GEF-x
Part No. 24-7664-3019, Rev. B
Issued November 6, 2015

Penn A421ABC-03C Specifications

General

Brand	Penn
Model	A421ABC-03C
Category	Controller
Language	English

Summary

Applications

Product Overview

Describes the A421 Series Electronic Temperature Controls and their features.

Enclosure Options

Details the available Type 1 (NEMA) IP20 and Type 4X (NEMA) IP66 enclosures.

Parts Included and Mounting

A99 Series Temperature Sensors

Details the A99 sensors required for A421 controls and their characteristics.

Mounting Guidelines

Provides essential advice for locating and securely mounting the A421 control.

DIN Rail and Surface Mounting

Explains the procedures for mounting Type 1/IP20 enclosures on DIN rail or flat surfaces.

Wiring and Safety

Type 4X/IP66 Mounting

Provides specific instructions for mounting Type 4X/IP66 enclosures.

Electrical Safety Precautions

Highlights critical safety warnings regarding electric shock during wiring.

Wiring Best Practices

Outlines essential guidelines for proper and safe wiring connections.

Sensor and Terminal Wiring

Sensor Cable Shielding

Details proper handling of shielded sensor cables to prevent interference.

Terminal Block and Relay Output

Explains the function of the TB2 terminal block and the SPDT relay output.

Wiring Diagrams and Terminal Info

TB2 Terminal Block Overview

Illustrates TB2 terminal block connections for the internal SPDT relay.

Terminal Block Wiring

Details terminal labels, functions, and recommended wire sizes for wiring.

Setup and Parameter Configuration

Front Panel Interface

Describes the LCD display, touchpad, and relay status LED on the control's front panel.

Relay Temperature Settings

Explains how to set the On and Off temperatures and determine heating/cooling mode.

Anti-Short Cycle Delay

Details the function and setting of the anti-short cycle delay for compressor protection.

Advanced Parameter Settings

Sensor Failure and Units

Covers sensor failure modes, temperature units, and temperature limit settings.

Setback, Offset, and Brightness

Explains temperature setback, sensor offset, and backlight brightness adjustments.

Control Menu Navigation

Parameter Setup Menus

Introduces the Basic, Advanced, and Restricted setup menus available for configuration.

Navigation Guidelines

Provides instructions on how to navigate through parameter codes and values.

Basic Menu Operation

Details how to view and change parameters in the Basic menu.

Menu Navigation and Operation

Advanced Menu Overview

Describes the parameters accessible within the Advanced menu.

Restricted User Adjustment

Advanced Menu Operation

Explains how to view and change parameters in the Advanced menu.

Restricted Mode Behavior

Details how the control operates when user adjustment is restricted.

Enabling Restricted Mode

Steps to set up the restricted adjustment feature using a jumper.

Restricted Mode Adjustment and Troubleshooting

Adjusting in Restricted Mode

Guides on how to adjust the OFF value within the restricted range.

Fault Code Definitions

Lists fault codes displayed on the LCD and their definitions.

Troubleshooting Procedures

Voltage and Power Checks

Steps to verify proper voltage supply to the A421 control.

Sensor and Control Verification

Procedures to check sensor operation and the A421 control's performance.

Ordering Information

Technical Specifications

Technical Specifications Details

Emissions Compliance

Information regarding US and Canadian emissions compliance standards.