SiME281501E Function DetailsFunction and Control 38RZQ36/45LVA, RZQ45/48MYL4.2.11 High Pressure Protection ControlIn order to prevent abnormal high pressures in the system and hence avoiding activation of the high pressuresafety device the below control function will be activated.DetailsThe high pressure value will be calculated from the low pressure, power input and compressor frequency. High pressure switch opens at: 4MPa (tolerance: +0 / -0.15) High pressure switch closes at: 3MPa (tolerance: +/- 0.15)Flow ChartNormal operationLp < 0.49MPaNormal operation&(When cooling operation) (When heating operation)• Within 10 minutes after defrosting• Lp < 0.1 MPa continuous for 5 minutes• Lp < 0.05 MPaUpper limit 128 HzCompressor upperlimit frequency67 HzCompressor upperlimit frequency38 HzCompressor upper limitfrequency38 HzCompressor stop: 0 HzAbnormal stop (E4 indication)• Within 5 minutes afterstarting• Within 10 minutesafter defrosting&• OR• Lp < 0.15 MPa& • Lp > 0.59 MPa• 30 sec. elapsed10 times or lessstopping in 200 minutes• Lp < 0.05 MPa• Lp < 0.1 MPa continuesfor 5 minutes 10 times or less stoppingin 200 minutesLp < 0.1 MPa Lp > 0.15 MPaCondition BCondition BLp > 0.25 MPaLp > 0.2 MPaStopped 11 times in 200 minutes• Within 5 minutes after starting• After 10 minutes after defrostingCondition B : &• OR• Lp > 0.25 MPaORNormal operationORHp > (C) MPa15 times orless stoppingin 300 minutesNormal operationCompressor operationfrequency B HzCompressor stopAbnormal stop (E3 indication)Abnormal stop (E3 indication)Compressor stopCompressor operationfrequency A HzCompressor operationfrequency –1 step/10 sec.Compressor operationfrequency +1 step/1 min.Compressor operationfrequency +1 step/5 min.Hp > (D) MPaHp > (C) MPaOROR&&Hp (H) MPa • Hp > (I) MPa• HPS activates• HPS activates• Stopped 16 times in300 minutesHp < (F) MPa• HPS activates• Hp > (E) MPafor 1 minute• HPS activates• Stopped 16 timesin 300 minutes(When cooling operation) (When heating operation)Hp (G) MPa • Hp < 2.94MPa• 30 sec. elapsed
