Daikin EWADC12C-XL [247/304] Low evaporator pressure unload

ESIE10-01 Alarms and Events

Part 3 – Troubleshooting 3–47

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