TDR Time Delay Relay Dinosaur Electronic TDR Time Delay Relay replacement Time delay relay is for use in older furnaces that use a standard 12VDC ignitor board. The TDR has a 4 second delay before applying power to the fan motor, and a 2 minute cool down period at the end of the heat cycle before removing power from the fan motor.

TDR (Time Delay Relay)  Furnace Time delay relay

12 VDC operation Micro controlled

few second delay 2 minute cool down cycle

Size: 1.5″ x 1.5″ Potted