Special Control
SiAF341904E
90
Part 4 Functions and Control
Note(s)
7. Special Control
7.1 Outdoor Unit Rotation
In the case of multi-outdoor-unit system, this outdoor unit rotation is used to prevent the
compressor from breaking down due to unbalanced oil level between outdoor units.
Details of outdoor unit rotation
In the case of multi-outdoor-unit system, each outdoor unit is given an operating priority for the
control.
Outdoor unit rotation makes it possible to change the operating priority of outdoor units.
Thus, the system becomes free of compressors that stop over an extended period of time at the
time of partial loading, preventing unbalanced oil level.
Timing of outdoor unit rotation
OR
After oil return operation
At the beginning of the startup control
There are outdoor units that stop operation.
Low pressure of all outdoor units in operation is less than 0.25 MPa.
Example) The following diagram shows outdoor unit rotation in combination of 3 outdoor units.
Cooling
1. “Master unit”, “slave unit 1” and “slave unit 2” in this section are the names for installation.
They are determined in installation work, and not changed thereafter. (These names are
different from “master unit” and “slave unit” for control.)
The outdoor unit connected the control wires (F1 and F2) for the indoor unit should be
designated as master unit.
Consequently, The LED display on the main PCB for “master unit”, “slave unit 1” and “slave unit
2” do not change.
N
ormal operation
Priority
1
Priority
2
Priority
3
Priority
3
Priority
1
Priority
2
N
ormal operation
Master Sla
v
e 1 Sla
v
e 2
Master
Sla
v
e 1 Sla
v
e 2
Start
u
p
control
O
u
tdoor
u
nit
rotation
Oil ret
u
rn
operation
O
u
tdoor
u
nit
rotation
N
ormal operation
Priority
1
Priority
2
Priority
3
N
ormal operation
Priority
2
Priority
3
Priority
1
Master Sla
v
e 1 Sla
v
e 2
Master Sla
v
e 1 Sla
v
e 2
·
There are o
u
tdoor
u
nits that stop
operation.
OR
·
Lo
w
press
u
re of all
o
u
tdoor
u
nits in
operation < 0.25 MPa.
O
u
tdoor
u
nit
rotation
Содержание RXQ12AHR
Страница 267: ...SiAF341904E Troubleshooting by Error Code Part 6 Service Diagnosis 261 Reference CHECK 7 Refer to page 293...
Страница 312: ...SiAF341904E 306 Part 7 Appendix 1 Wiring Diagrams 307 1 1 Outdoor Unit 307 1 2 VRV Indoor Unit 310 Part 7 Appendix...
Страница 313: ...SiAF341904E Wiring Diagrams Part 7 Appendix 307 1 Wiring Diagrams 1 1 Outdoor Unit RXQ6 8 10 12ARY1 3D112175E...
Страница 314: ...Wiring Diagrams SiAF341904E 308 Part 7 Appendix RXQ14ARY1 2D112174G...
Страница 315: ...SiAF341904E Wiring Diagrams Part 7 Appendix 309 RXQ16 18 20ARY1 2D112524F...
Страница 317: ...SiAF341904E Wiring Diagrams Part 7 Appendix 311 1 2 2 Auto Grille Panel BYCQ125EASF for FXFSQ 3D108035...
Страница 319: ...SiAF341904E Wiring Diagrams Part 7 Appendix 313 FXMQ40 50 63 80 100ARV1 3D112427A...
Страница 320: ...Wiring Diagrams SiAF341904E 314 Part 7 Appendix 1 2 4 Wall Mounted Type FXAQ20 25 32PVE FXAQ40 50 63PVER1 C 3D076498B...
