Protection Control
ESIE09-08A
64
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 heating operation [R-410A]
Reach INV freq = MAX INV freq for each HP
• Pe>2.3MPa
or
After 10 sec.
Pe<0.17MPa
Pe<0.17MPa
Pe>0.20MPa
Pe< 0.07MPa
Current step limited
After 15 sec.
Low pressure not limited
Low pressure limited
Pe<0.12MPa Pe>0.17MPa
Hot gas SVP = OFF
Hot gas SVP = ON
Pe: LP pressure sensor detection
value
INV upper limit frequency :
3-step down from current
compressor frequency
INV upper limit frequency :
1-step up from current
compressor frequency
Low pressure
standby
When occurring 3 times within 30 min., the
malfunction code "E4" is output.
Summary of Contents for ALTHERMA HT EKBUHAA6 V3
Page 2: ......
Page 7: ...ESIE09 08A Table of Contents v 1 3 Service Tools 283 Index i Drawings Flow Charts iii ...
Page 16: ...Model Names of Indoor Outdoor Units Tanks ESIE09 08A 4 General Information ...
Page 28: ...Refrigerant Circuit ESIE09 08A 16 Refrigerant Circuit EKHBRD 011 014 016 AB AC V1 Y1 ...
Page 40: ...Functional Parts Layout ESIE09 08A 28 Refrigerant Circuit ...
Page 63: ...ESIE09 08A PCB Layout for EKHBRD 011 014 016 AA AB AC V1 Y1 Refrigerant Circuit 51 ...
Page 64: ...PCB Layout for EKHBRD 011 014 016 AA AB AC V1 Y1 ESIE09 08A 52 Refrigerant Circuit ...
Page 125: ...ESIE09 08A Field Setting Test Operation 113 ...
Page 232: ...Troubleshooting by Indication on the Remote Controller ESIE09 08A 222 Troubleshooting ...
Page 237: ...ESIE09 08A Piping Diagrams Appendix 227 EKHBRD 011 014 016 AB AC V1 Y1 ...
Page 250: ...Wiring Diagrams ESIE09 08A 240 Appendix EKHBRD 011 014 016 AB AC V1 ...
Page 251: ...ESIE09 08A Wiring Diagrams Appendix 241 ...
Page 256: ...Wiring Diagrams ESIE09 08A 246 Appendix EKHBRD 011 014 016 AB AC Y1 ...
Page 257: ...ESIE09 08A Wiring Diagrams Appendix 247 ...
Page 260: ...Wiring Diagrams ESIE09 08A 250 Appendix ...
