Refrigeration compressor and oil segregator are utilized to protect the oil level. In order for them to function, oil level switch needs to be installed in the corresponding maximum or minimum position of the oil level. Adopting the principle of refraction and reflection, single point optic level switch is used for contactless monitor of liquid level, Its small size and adjustment free, bearing many advantages including high pressure resistance, chemical corrosion resistance etc., is favored by equipment manufacturer. Optic level switch, however, can only function normally with power supply, and the voltage is, generally, control power. There are no strict regulations on the control voltage within different countries, for example, some uses 208 -240VAC, some uses 110 -120VAC, some uses 24VAC- 24VDC. Hence, the optic level switches applied to the above supply voltage, assembled on the refrigeration equipment, are likely to be accepted.

OLC-A Level control, developed by GOLDAIR, may use the voltage AC115-240 V±10% and AC/DC 24V±10%. The length of the 6-core-cable is 2m, if the supply voltage is AC 115-240V, connect it to the BROWN and BLUE line;if the supply voltage is AC/DC 24V, connect it to the VIOLET line and BLUE line(note, DC24V, free access method)。

The following diagram is the OLC-A level control wiring diagram：