Fits Dayton Heater 2E583, 2E587 .Dayton # 1ZKW3, 23TD87. Qmark MUH-10-2, MUH-07-8; JA2P226N, JA2P226; F33HZW3592, 3900-2014-000, 39002014004, 3900-2014-004, 39002014000, 3900-2014-000. 4 Wires: White = Common; Black = 208 V; Blue = 240 V; Red = 277 V