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For electric heat, hot gas or compressor shutdown defrost. The DTAV40 Series Auto Voltage Defrost Timer 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 before the programmed defrost termination time has been reached. The time termination functions as a fail-safe and terminates the defrost cycle if the temperature or pressure switch fails to do so.


  • Thermistor probe connections are not an isolated Class 2 circuit
  • Only use a thermistor probe specified for use with DDFM model


  • Walk-in Refrigeration Cooler/Freezer


Input Voltage Range(s) 120/240 VAC, 60 Hz Mounting Options Bracket
Time Initiation Temperature, Time Maximum ON/OFF Times 23 hours, 45 min
Mechanism Type Digital/Electrical Warranty Period 1-Year limited
Application Compatibilities Commercial Refrigeration, Walk-in Cooler, Walk-in Freezer Category Defrost Timers Web
Connector Wire Length 6 ft (1.83 m) Country of Origin (Graesslin) Mexico
Defrost LED Indicator Blue Diagnostics and Efficiency LED Indicator Blue
Refrigeration LED Indicator Blue RoHS Certification Yes
Thermistor Probe Wire Length 10 ft (3.05 m) Thermistor Rating 10 K ? @ 25° C (77° F)
Thermistor Type NTC Wire Size Max #24 AWG
Wire Size Min #24 AWG Working Range -40° F to 152° F (-40° C to 67° C)
Product Depth (in) 17/32 Product Depth (mm) 13.49
Product Height (in) 8 Product Height (mm) 203.2
Product Width (in) 4 13/16 Product Width (mm) 122.24
Unit Carton Height (in) 8.5 Unit Carton Length (in) 5.25
Unit Carton Weight (lb) 0.45 Unit Carton Width (in) 2.25

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