Proto-Aire EZ I/O Manual
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3090249_E
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Electronic Oil Level Control
Electronic oil regulators monitor oil levels. The units are powered by a 208V power supply.
When the oil level in the compressor drops below ½ sightglass, the fill light comes on and the
oil solenoid is energized. If after 90 seconds, the oil level does not rise above ½ sightglass, the
unit opens the compressor control circuit. If oil becomes available, the control will re-set and the
compressor will resume operation.
Auxiliary Systems
This form of sensor inputs can be programmed for analog operation (case temperature sensor)
or digital operation (such as Klixon). The auxiliary sensors are typically used to provide
information to control regarding a particular defrost circuit.
Temperature Termination (Digital Mode)
The following information is required for proper operation when an auxiliary sensor is used to
connect a defrost termination thermostat (Klixon*) device to the control in order to terminate
defrost on high temperature. (*No case temperature sensor present.)
Note: It is assumed that while in refrigeration, the defrost termination thermostat (which is a
close on rise device) should be open.
