Service Manual 205
Function
1.4 subcooling LEV control
Subcooling LEV works with fuzzy rules to maintain the subcooling degree at the outlet of subcooler during
cooling mode
Subcooling degree = Tcondensation -Tliquid
Tliquid : temperature at outlet of subcooler(˚C)
Tcondensation : condensation temperature equivalent to high pressure(˚C)
1.5 Fan control
Main unit's fan motor operates with inverter drive by fuzzy control and sub units°Ø fan motors are all step
motors.
2.1 Oil return control
2.1.1 Oil return control on cooling mode
Fan Step
Left fan
Right fan
0
Stop
Stop
1
Low
Stop
2
High
Stop
3
Low
Low
4
High
Low
5
High
High
Fan frequency
<5 Hz
5 Hz
≤
Frq < 10Hz
10 Hz
≤
Frq < 20Hz
20 Hz
≤
Frq < 30Hz
30 Hz
≤
Frq < 40Hz
Frq
≥
40Hz
Sub unit
Main unit
Inv Compressor
Fan
Main LEV
4 way valve
Subcooling LEV
30 Hz
0 Hz
Full open
Off
min.
Starting
Component
Sub unit ’s
compressor
All off
Hot gas bypass
valve
Off
60 Hz
High pressure
control
Full open
Off
min.
Running
On
Off
30 Hz
High pressure
control
Base pulse
Off
min.
Ending
Off
Off
1. Basic control
Summary of Contents for multi V PLUS
Page 21: ...Service Manual 21 Indoor Unit Indoor Units ...
Page 74: ...74 Indoor Unit ...
Page 86: ...86 Indoor Unit ...
Page 142: ...142 Indoor Unit ...
Page 160: ...160 Indoor Unit ...
Page 179: ...Service Manual 179 Outdoor unit ...
Page 239: ...Service Manual 239 Wiring Diagrams 5 8 60Hz 220V Main Outdoor Unit 8HP 10HP 12HP ...
Page 245: ...Service Manual 245 Trouble shooting guide ...
Page 296: ...296 Trouble Shooting Guide ...
Page 297: ...Service Manual 297 Appendix ...
Page 303: ...Service Manual 303 Exploded View Replacement Parts List ...