Features and benefits - PENN Controls - LIT-12012219 - A421ABD - A421AED - Electronic Temperature Control - A421 Off‐Cycle Defrost Models

A421 Series Electronic Temperature Controls with Off-Cycle Defrost Product Bulletin

Brand
PENN Controls
Product name
A421 Off‐Cycle Defrost Models
Document type
Product Bulletin
Document number
LIT-12012219
Revision date
2023-03-07
Language
English
Off-cycle defrost
Shut off the refrigeration system for a defined defrost time interval and frequency. You can also start or stop a manual-only defrost off-cycle.
Control front panel LCD
Displays the temperature, parameters, and status. You can adjust the backlight brightness for ambient light conditions. Custom icons display the system and control status.
Basic and advanced programming menu
Provides two levels of parameter adjustment and control. You can set up advanced features in one menu and easily adjust basic parameters in the other menu.
On and Off temperature adjustment
Select the temperature values at which the relay turns on and off, which automatically defines the mode of operation.
Switch-activated temperature setback
Shift the On or Off temperature by an adjustable setback. When a user-supplied switch closes the binary input control circuit, temperature setback is enabled.
Adjustable anti-short cycle delay
Select the minimum time the output relay remains off before the next on-cycle. By selecting this minimal time, you can avoid short cycling, hard starts, and nuisance overload outages on compressors and other inductive applications.
Adjustable sensor offset
Adjust the displayed temperature to the actual sensed temperature.
Optional restricted adjustment mode
Restrict On or Off adjustment to your defined temperature range.
Sensor failure mode
Run the control continuously in the event of a sensor or sensor wire failure or shut it down.
Backlight brightness level
Adjust the LCD backlight intensity. You can apply the backlight brightness level during normal operation. When you set up or adjust the parameters, the LCD automatically goes to the brightest level.