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Protection Control
SiUS39-602
60
Function
4.2
Low Pressure Protection Control
This low pressure protection control is used to protect compressors against the transient
decrease of low pressure.
[In cooling operation]
[In heating operation]
Low pressure not limited
Pe<50 psi
Low pressure standby
Low pressure limited
All STD compressors
stop.
Master unit:52 Hz + OFF
Slave unit:Stop
Pe<36 psi
Pe>58 psi
Pe<10 psi
Pe: LP pressure sensor detection
value for master unit
When occurring 3 times within 30 min.,
the malfunction code “ E4 ” is output.
Pe<23 psi
Pe<19 psi
Pe >36 psi
INV upper limit frequency = 210 Hz
Pe<10 psi
&
Low pressure not limited
Low pressure standby
Low pressure limited
124 Hz + OFF
INV upper limit frequency: 1-step /
20 sec up from current compressor
frequency
52 Hz + OFF
Pe: LP pressure sensor detection
value for each outdoor unit
Pe>28 psi
Pe<23 psi
When occurring 3 times within 30 min.,
the malfunction code “E4” is output.
Summary of Contents for REYQ72
Page 35: ...Specifications SiUS39 602 24 Specifications...
Page 121: ...Field Setting SiUS39 602 110 Test Operation...
Page 129: ...Troubleshooting by Remote Controller SiUS39 602 118 Troubleshooting...
Page 225: ...Troubleshooting OP Unified ON OFF Controller SiUS39 602 214 Troubleshooting...
Page 232: ...SiUS39 602 Piping Diagrams Appendix 221 1 3 BS Unit BSVQ36MVJU BSVQ60MVJU 4D045338...
Page 235: ...Wiring Diagrams for Reference SiUS39 602 224 Appendix REYQ144 168 192MTJU C 3D050354A...
Page 240: ...SiUS39 602 Wiring Diagrams for Reference Appendix 229 2 4 BS Unit BSVQ36M 60MVJU 3D045069A...
Page 249: ...Example of Connection R 410A Type SiUS39 602 238 Appendix...
Page 255: ...Method of Replacing The Inverter s Power Transistors and Diode Modules SiUS39 602 244 Appendix...
Page 265: ...Precautions for New Refrigerant R 410A SiUS39 602 254 Precautions for New Refrigerant R 410A...
Page 269: ...SiUS39 602 iv Index...