Liebert iCOM Microprocessor TM-10098 Manuel d'utilisateur télécharger pdf (Page 13)

iCOM

Controls Training and Service Manual

The temperature controller deactivates the second stage of cooling (lag

compressor) when the return air temperature decreases to 50% of the cooling

proportional control band value. The first cooling stage (lead compressor) is

deactivated when the return air temperature decreases to the temperature set

point value or 0% of the cooling proportional control band value.

2 Stage Compressorized Cooling – No Dead Band

Temp Set Point: 70°F

Proportional Band: 8°F

70 71 72 73 74 75

Increasin

Temperature

Cool 1 On

Cool 1 Off

Cool 2 On

Cool 2 Off

Temp Set Point + (1/2 Proportional Band)

Note: in the above example that the control band begins at the 70°F temperature

set point and has a length of 4°F, which is ½ of the programmed temperature

proportional band value.

As the return air temperature increases Cooling 1 (lead compressor) is activated at

72°F or 50% of the cooling control band. If the return air temperature continues to

increase Cooling 2 (lag compressor) will activate at 74°F or 100% of the cooling

control band.

When the return air temperature starts to decrease, Cooling 2 (lag compressor) is

deactivated at 72°F or 50% of the cooling control band and Cooling 1 (lead

compressor) is deactivated at the temperature set point of 70°F or 0% of the

cooling control band.

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Liebert iCOM Microprocessor TM-10098 Manuel d'utilisateur Page 13