Protection Control ESIE09-0858 Function4.2 Low Pressure Protection ControlThis low pressure protection control is used to protect compressors against the transientdecrease of low pressure.In heating operation [R-410A]Reach INV freq = MAX INV freq for each HP• Pe>2.3MPaorAfter 10 sec.Pe<0.17MPaPe<0.17MPaPe>0.20MPaPe< 0.07MPaCurrent step limitedAfter 15 sec.Low pressure not limitedLow pressure limitedPe<0.12MPa Pe>0.17MPaHot gas SVP = OFFHot gas SVP = ONPe: LP pressure sensor detectionvalueINV upper limit frequency :3-step down from currentcompressor frequencyINV upper limit frequency :1-step up from currentcompressor frequencyLow pressurestandbyWhen occurring 3 times within 30 min., themalfunction code "E4" is output.
