ESIE10-01 Alarms and Events
Part 3 – Troubleshooting 3–47
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1.5.2 Low Evaporator Pressure - Unload
Event description (as shown on screen): EvapPressLowUnload N.
Trigger: This event is not enabled until the circuit startup is complete and the unit mode is Cool. Then,
while running, if evaporator pressure <= Low Evaporator Pressure Unload set point the event is
triggered. The event is not to be triggered for 90 seconds following the capacity change of the
compressor from 50% to 60%.
Action Taken: Unload the compressor by decreasing the capacity by one step every 5 seconds until
the evaporator pressure rises above the Low Evaporator Pressure Unload set point.
Reset: While still running, the event will be reset if evaporator pressure gets above the Low Evaporator
Pressure Hold setpoint plus a difference. The event is also reset if the unit mode is switched to Ice, or
the circuit is no longer in the run state.
HP Hold Evap.
1.9 b
hold capacity area
load down area
unit switched off by LP switch
P Down Evap.
1.80 b
LP Switch
0.6 b
LP (bar)
Time
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