Table 3 Methods of fault imposition.

From: Dataset of low global warming potential refrigerant refrigeration system for fault detection and diagnostics

Fault types

Fault scenarios

Methods of fault imposition

Open LT display case door

5%, 10%, 15% of the time

Program an automatic door open device to control the door open time

Ice accumulation on LT evaporator coil

Mild, moderate, severe

Manually set the daily defrost times to build up the ice on the evaporator coil

LT evaporator expansion valve failure

Partially closed, Fully closed

Manually adjust the evaporator expansion valve opening position

MT evaporator fan motor failure

25%, 50%, 75%

Sequentially turn off three of four MT evaporator fans

Condenser air path blockage

25%, 50%, 75%

Block the condenser coil inlet air path

MT evaporator air path blockage

25%, 50%, 75%

Block the MT evaporator coil return air path

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