Description - PENN Controls - LIT-12011972 - A421ABC - A421ABG - A421ABJ - A421AEC - A421AEJ - A421GBF - A421GEF - Electronic Temperature Control - A421 Standard Model

A421 Series Standard Electronic Temperature Controls with and without Power Cords Product Bulletin

PENN Controls
Product name
A421 Standard Model
Document type
Product Bulletin
Document number
Revision date

The A421 Series Standard Electronic Temperature Controls are single-stage electronic temperature controls with a single-pole, double-throw (SPDT) output relay. The controls feature an adjustable backlit LCD for viewing the temperature and status of other functions, and a three-button touchpad for setup and adjustment. An LED indicates the On or Off status of the output relay.

The A421 Controls are available in low-voltage 24 VAC and high-voltage 120 VAC or 240 VAC models, which provide options for most refrigeration and HVAC applications.

The A421 Controls provide heating or cooling control, sensor offset, temperature setback, adjustable anti-short cycle delay, and a restricted user adjustment mode. The control can display the temperature units in °F or °C. The temperature adjustment range is -40°F to 212°F or -40°C to 100°C.

The A421 Controls are available in Type 1/IP20 high-impact plastic enclosures suitable for surface or DIN rail mounting, as shown in the following figure, and Type 4X/IP66 watertight, corrosion-resistant, surface-mount enclosures.

Figure 1. A421 temperature control

Some A421 Series Control models are equipped with factory-installed power cords. The power cords provide convenient plug-in connection and control of 120 VAC heating and cooling equipment.