Liebert iCOM Microprocessor TM-10098 Manuel d'utilisateur télécharger pdf (Page 16)

iCOM

Control Training and Service Manual

4 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 4 On

Cool 3 Off

Temp Set Point + (1/2 Proportional Band)

Cool 2 On

Cool 3 On

Cool 4 OffCool 2 Off

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, the lead compressor unloaded,

is activated at 71°F or 25% of the cooling control band. If the return air

temperature continues to increase Cooling 2, the lag compressor unloaded is

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

continues to increase Cooling 3, the lead compressor is loaded at 73°F or 75% of

the cooling control band. If the return air temperature continues to increase

Cooling 4, the lag compressor is loaded at 74°F or 100% of the cooling control

band.

When the return air temperature starts to decrease, Cooling 4 is deactivated at

73°F or 75% of the cooling control band. If the return air temperature continues to

decrease Cooling 3 is deactivate at 72°F or 50% of the cooling control band. If the

return air temperature continues to decrease Cooling 2 is deactivate at 71°F or

25% of the cooling control band and Cooling 1 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 16