Figure 17 Single And Dual Digital Scroll Compressor Activation Points - Emerson Liebert Challenger 3000 User Manual
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- Installation manual (88 pages) ,
- Operation & maintenance manual (72 pages) ,
- User manual (32 pages)
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On single and dual digital scroll compressor systems, the first compressor is started at 25% calculated
output from the temperature proportional band and stopped at 10%. On dual digital scroll compressor
systems, the second compressor is started at 35% and stopped at 20%, see Figure 17. When a com-
pressor is started, the solenoid is energized longer than it is de-energized to match the call for cooling.
When the call for cooling increases to 100%, the solenoid is de-energized for the entire 15 second cycle.
Figure 17 Single and dual digital scroll compressor activation points
Temp Setpoint : 70°F
Proportional Band : 8°F
Deadband : 2°F
Comp 1 On Partially
Loaded
½ Dead-
band
70
71
72
0%
Comp 1
Cooling
Off
Comp 2
Off
½ Proportional Band
Comp 1 & 2 On
Fully Loaded
Comp 2 On Partially
Loaded
73
74
75
Increasing Temperature
21
+ 100 %
Cooling
Operation
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