24-Hour and/or 7-Day Electronic Defrost TimerThe DTAV40E2 Electronic Autovoltage Defrost Timer has flexible 7 day scheduling and to the minute defrost duration control to increase system efficiency (decrease defrost scheduling during low demand periods). It is applicable to air defrost (compressor shutdown) and electric or hot gas defrost systems where the defrost cycle is terminated by the timer. If the coil is frost free, the timer can also be terminated by temperature or pressure switches