Nordyne 1045845R Defrost Board 319852-301 The JB T3-4B Brass Tee

The JB T3-4B Brass Tee is a high-performance 1/4 x 1/4 x 1/4 flare tee engineered for demanding HVACR refrigeration service

It is not intended for steam service

making it a staple for contractors managing critical HVACR steam systems where durability and exact pressure reduction are non-negotiable

Experienced technicians will recognize its standard three-wire configuration: red for 5V power

single-phase motor pulling roughly 2

Nordyne 1045845R Defrost Board 319852-301 The JB T3-4B Brass TeeThe Nordyne 1045845R Defrost Board is the primary OEM replacement for the aging 1035831R and 624813 control modules. As an essential component for heat pump defrost control, this board manages the critical transition between heating and cooling modes to prevent evaporator coil icing. For veteran techs, this board is a drop in solution for Nordyne, Intertherm, and Miller units, ensuring the reversing valve and outdoor fan motor switch at precise