Koolance CTR-CD1224 12V or 24V Pump & Fan Controller With Display The CTR-CD1224 is a pump and fan speed controller and temperature monitoring unit in a 5.25in drive bay profile. The maximum pump output can be set for 12V or 24V. This unit incorporates a 2-line OLED display for user control and feedback. Configure a dynamic fan ramp based on min/max temperature set points. Show flow rate in LPM or GPM (optional Koolance flow meter required).