Sensor failure mode - 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

The sensor failure mode defines how the A421 control operates the equipment in the event of a sensor or sensor-wiring failure. The A421 control can be set to run the equipment continuously or to shut it down if the sensor or sensor wire fails. When a failure is detected, SF flashes alternately with OP on the LCD if the sensor circuit is open, or SF and SH if the sensor circuit is shorted.