Liebert TM-10098 service manual iCOM Control Training and Service Manual

iCOM Control Training and Service Manual

As the return air temperature increases Cooling 1, lead compressor unloaded, is activated at 72°F or ½ of the dead band value plus 25% of the cooling control band. If the return air temperature continues to increase Cooling 2, lag compressor unloaded, will activate at 73°F or ½ of the dead band value plus 50% of the cooling control band. If the return air temperature continues to increase Cooling 3, lead compressor unloaded, is activated at 74°F or ½ of the dead band value plus 75% of the cooling control band. If the return air temperature continues to increase Cooling 4, lag compressor loaded, will activate at 75°F or ½ of the dead band value plus 100% of the cooling control band.

When the return air temperature starts to decrease, Cooling 4 is deactivated at 74°F or ½ of the dead band value plus 75% of the cooling control band. If the

return air temperature continues to decrease Cooling 3 will be deactivate at 73°F or ½ of the dead band value plus 50% of the cooling control band. If the return air temperature continues to decrease Cooling 2 will be deactivate at 72°F or ½ of the dead band value plus 25% of the cooling control band and Cooling 1 is deactivated at 71°F or 1/2 the dead band value plus 0% of the cooling control band.

Remember the temperature dead band value is used by the control to shift the cooling on/ off operations away from the temperature set point.

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