Model Compatibility: Compatible with diesel air parking heaters operating at 12V or 24V electrical systems and rated for 3KW or 5KW output. Technical Specification: Functions as a motherboard board controller for diesel air parking heater systems with 12V/24V input voltage and 3KW/5KW power rating. Installation Note: Designed as a direct replacement motherboard board controller to restore functionality of compatible diesel air parking heater units. Voltage Compatibility: Supports both 12V and 24V electrical systems as specified for use with diesel air parking heater. Power Rating Compatibility: Matches the 3KW and 5KW power ratings of diesel air parking heater systems requiring this motherboard board controller.