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Misc. Control
• Control Mode = Drop-down box allows selection of current operating mode, from the list of allowable modes.
• High Motor Amps (Unloading) = This control feature will limit the compressor capacity when the compressor
motor amps reaches these load limiting set-points. When the set-points are set properly, this control feature
will prevent the motor from operating at excessive high amp conditions, which will help to prevent the com-
pressor starter from stopping the compressor on “motor overload” conditions.
• Stop Load = prevents the compressor from loading when the set-point is reached. For a 1.15 SF motor, this
value is the FLA value stamped onto the motor nameplate.
• Force Unload = forces an unload condition when this set-point is reached. For a 1.15 SF motor, this value
is FLA value (from motor nameplate) x 1.15. The unload pulse is released when the motor amps lands just
above the FLA setting.
• High Discharge Pressure (Unloading) = This control feature is active in Suction Pressure or Process Tempera-
ture Capacity Control mode. This control feature will limit the compressor from loading when the compressor
discharge pressure reaches these load limiting conditions. When the set-points are set properly, this control
feature will prevent the compressor from experiencing excessive high discharge pressure that could result in a
high discharge pressure failure. The high discharge pressure unloading set-points over-ride the Suction Pres-
sure or Process Temperature Capacity Control Set-points.
Additional Control Setpoints