Figure 3.4 Compressor Control—Two Step Capacity Using Two Scroll Compressors without Unloaders
Number Description
1 Scroll compressor 1.
2 Scroll compressor 2.
3 ½ of proportional band.
4 Deadband.
One Scroll Compressor with Unloader
• 70° setpoint
• 8° proportional band
• 2° deadband
In Figure 3.5 on the next page :
The compressor starts unloaded at 73° when the cooling requirement is 50%.
At 75° when the cooling requirement is 100%, the compressor operates loaded until 73° is reached when cooling requirement
is 50% and it returns to unloaded operation.
3 Service Operation
31
Vertiv™ Liebert® iCOM™Installer/User Guide
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