White Rodgers 57T01-843 Blower Time Delay Relay

The 57t01-843 time delay relay is for use in air handlers installed in compressor-run air conditioning and heat pump systems to delay the blower shut-off after the compressor has shut off. Replaces trane part numbers d155079p01 and rly 2807, rly02807, rly02257. Features allows residual cooled air to be blown into the controlled space, increasing the efficiency of the system in cooling. Depending on electrical hookup in a heat pump system, delay of blower shut-off could also occur in heating.