4.
5. Compressor speed
a) Speed limit
When fitting any compressor from the Unicla range, ensure that the compressor speed does
not exceed the specified limit. This includes both continuous speed and momentary speed.
Crank to compressor drive ratios are recommended to not exceed 1.2:1 to ensure maximisation
of compressor clutch and pulley durability. In low speed governed applications the gearing
ratio may exceed 1.2:1 to provide maximum performance providing the rated compressor
speed is not exceeded. The following chart gives the Unicla speed recommendation for each
model.
b) Pulley ratios
If excessive pulley ratio is
unavoidable, then consideration
should be given to fitment of a
cut – off sensor for over speed.
c) Compressor rotation
The direction of rotation of the compressor must match the application in which it is being
placed. Unicla compressors are designed to operate in both clockwise and counterclockwise
directions. However, the clutch design varies depending on direction of rotation.
Later generation rubber clutches are designed to operate in both directions, making the
compressor and clutch assembly multi directional.
Failure to match the clutch with its direction of rotation may result in premature clutch
failure, especially in applications of high torque engagement spike (high head pressure)
and/or constant high speed cycling.
6. Oil selection
a) Recommended oil
Each Unicla compressor is fitted with specific oil. The following chart outlines the
recommended selection of oil and refrigerant to common applications, however each
compressor is labelled separately with the refrigerant and oil type to be used.
Only this recommended refrigerant and oil should be used. Failure to comply with this
may result in dramatically reduced oil circulation rates with subsequent starvation of the
compressor.
Warranty is void if non-approved oils and refrigerants are used.
Compressor
series
Ideal operation
speed rpm
Maximum
continuous rpm
Maximum
momentary rpm
90
1800-2400
3000
4500
120/150/170
1800-2400
3000
6000
200/330
1500/2500
3000
4500
440/550
1200/2500
3000
4500
