ActronAir Coil Temperature Sensor NTC060HP03 "Hercules" 6m is the Carel-supplied coil temperature sensor for Hercules commercial systems, monitoring outdoor coil temperature across a 6-metre cable run to the CM100 commercial control board for defrost management and capacity optimisation. The NTC060HP03 uses a Carel-specific thermistor characteristic that is not interchangeable with generic NTC sensors -- the CM100 board's temperature calculation firmware is calibrated to this specific sensor curve. Isolate power at mains before replacing any Hercules refrigeration sensors.