LT-S-(L) Technical manual
specification
：
300W
；
220V
；
IP54
；
UL certified
10.4.3
Oil level switch
Photoelectric level switch
Application note
：
The photoelectric level switch is used to monitor the lubricating oil level of the
compressor. Its inside contains an infrared light emitting diode and a light receiver.
The light emitted by the LED is directed into the prism at the top of the sensor. When
the liquid is not submerged in the prism, the light is reflected directly from the prism
back to the receiver; when the liquid is submerged in the prism, the light is refracted
into the liquid and the receiver is unable to receive the light. By sensing this change,
the receiver can drive an internal electrical switch to activate an external alarm or
control circuit.
Function Description
：
No.
Features
effect
1
Oil
level
protection
The compressor oil level can be detected in real time to prevent the compressor from
being seriously damaged due to oil loss.
2
Action delay
In order to avoid compressor failure when oil level fluctuation occurs, this product is
recommended to set the delay as 60-90 S before cut off the compressor power supply.
When the oil level is continuously higher than the detection oil level 60-90 S, the
compressor will automatically reset. .
3
Signal indication INT276LN:
The oil level is higher than the detection oil level
The oil level is lower than the detection oil level
When internal fault, input voltage is too low or abnormal
installation
Wiring method and using instructions
：
1) When L1, L2, L3 are connected to the power supply, ensure that the voltage value is
within the allowable range specified by the product, otherwise the product will not
work normally.
2), the blue line and the brown line are respectively connected to the L1 and N power
lines (220V) as the power supply for the liquid-liquid switch;
3), the gray line is connected to L1;
4), the orange wire is connected to the unit protection circuit, and the start and stop of
the compressor motor is indirectly controlled by the opening and closing of the control
relay;
5), pink line connected to the unit alarm circuit.
