Wide Applications - Our 8330-752 Control Box is designed for ductless air conditioning systems equipped with wall-mounted thermostats. It converts air conditioning units with two knobs to be controlled using a standard thermostat and allows you to connect it to a standard thermostat. Powerful Functionality - This kit includes a control box assembly. An evaporator antifreeze sensor is housed in an envelope and can be installed via a quick connector to the "antifreeze" terminal block. These low-voltage controllers are capable of driving rooftop air conditioners as well as any furnace with a 12V DC control circuit. Replacement Part Numbers: 7330D3211, 7330B5551, 7330C5551, 7330A751, 7330B751, 8330-752, 8330-5551, 8330-3851. Applicable to ceiling components/ventilation ducts with the following product : Recessed ceiling ventilation ducts 7330B750, 7330C750, 7330751 (7330-751), 7330A751, 7330B751, 7330752 (7330-752); Recessed ceiling components 8330633 (8330-633), 83306332 (8330-6332), 8330731 (8330-731), 8330733 (8330-733), 83307332 (8330-7332), 8330A731, 8330A733, 8330A7333; Refrigerated grilles 8330B623, 8330B6332; Refrigerated grilles 2 8430633 (8430-633), 8430634 (8430-634), 8430A633, 8430A6332, 8430A634. Color: As Shown Material: ABS Package Contents: 1 * air conditioning control box assembly set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.