Alarms and Events ESIE10-01
3–20 Part 3 – Troubleshooting
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1.4.2 Low Evaporator Pressure
Alarm description (as shown on screen): Evap Press Low N.
Trigger: [Freezestat trip AND Circuit State = Run] OR Evaporator Press < 0.7 bar.
Freezestat logic allows the circuit to run for varying times at low pressures. The lower the pressure,
the shorter the time the compressor can run. This time is calculated as follows:
■ Freeze error = Low Evaporator Pressure Unload - Evaporator Pressure.
■ Freeze time = 70 - 6.25 x freeze error, limited to a range of 20-70 seconds.
When the evaporator pressure goes below the Low Evaporator Pressure Unload set point, a timer
starts. If this timer exceeds the freeze time, then a freezestat trip occurs. If the evaporator pressure
rises to the unload set point or higher, and the freeze time has not been exceeded, the timer will reset.
The alarm cannot trigger if the evaporator pressure sensor fault is active.
Action Taken: Rapid stop circuit.
Reset: This alarm can be cleared manually if the evaporator pressure is above 0.7bar.
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