If the wire from the differential switch to the heater is broken, what will happen to the oil failure control?

When the wire from the differential switch to the heater is broken, the functionality of the oil failure control gets compromised. The differential switch is designed to monitor the oil levels and conditions within the compressor system. Specifically, it typically activates a heater in case of low oil pressure or other failure conditions to help maintain safe operational parameters.

If the connection is severed, the control system won't receive signals regarding oil pressure or temperature changes, leading it to assume that the system is functioning under optimal conditions. Consequently, the compressor will continue to operate without any intervention, ignoring critical safety measures that would usually shut it down during oil failure. This continuous operation without proper oversight can lead to serious damage to the compressor, as it may run in conditions unsuitable for its safety and efficiency.

Thus, in the event of a broken wire from the differential switch, it is accurate to conclude that the control system will not work correctly, and the compressor will run regardless of the actual differential conditions present in the system.