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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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