SiUS331604E
Basic Control
Functions and Control
34
2.2
Compressor PI Control
Carries out compressor capacity control to maintain Te at constant during cooling operation and Tc at constant
during heating operation thus ensuring stable unit performance.
Cooling operation
Controls compressor capacity to achieve target Te value (TeS).
Te: Low pressure equivalent saturation temperature
TeS: Target temperature of Te (Varies depending on Te setting, operating frequency, etc.)
(1) VRT control (Default)
When the required capacity of all indoor units (suction air temperature – set temperature) is small, the target
evaporation temperature is further increased in order to adjust capacity. From the outdoor unit side, the
temperature difference for all indoor units (
∆
T) is confirmed, and the target temperature is changed.
(2) Constant pressure control
The target evaporation temperature is not changed.
Heating operation
Controls compressor capacity to achieve target Tc value (TcS).
Tc: High pressure equivalent saturation temperature
TcS: Target temperature of Tc (Varies depending on Tc setting, operating frequency, etc.)
(1) VRT control (Default)
When the required capacity of all indoor units (set temperature – suction air temperature) is small, the target
condensation temperature is further decreased in order to adjust capacity. From the outdoor unit side, the
temperature difference for all indoor units (
∆
T) is confirmed, and the target temperature is changed.
(2) Constant pressure control
The target condensation temperature is not changed.
Te setting (Make this setting while in setting mode 2.)
Lower
Normal
VRT
(Default)
Higher
3°C
(37.4°F)
6°C
(42.8°F)
Variable
8°C
(46.4°F)
9°C
(48.2°F)
10°C
(50°F)
11°C
(51.8°F)
Tc setting (Make this setting while in setting mode 2.)
VRT
(Default)
Normal
Higher
Variable
46°C
(114.8°F)
52°C
(125.6°F)
Summary of Contents for VRV IV-S RXTQ-TAVJU Series
Page 1: ...Service Manual SiUS331604E RXTQ36 48 60TAVJU Heat Pump 60 Hz...
Page 254: ...Wiring Diagrams SiUS331604E 241 Appendix RXTQ48TAVJU 3D100496A...
Page 255: ...SiUS331604E Wiring Diagrams Appendix 242 RXTQ60TAVJU 3D100497A...
Page 260: ...Wiring Diagrams SiUS331604E 247 Appendix FXEQ07 09 12 15 18 24PVJU C 3D098557...
Page 267: ...SiUS331604E Wiring Diagrams Appendix 254 FXTQ12 18 24 30 36 42 48 54PAVJU 3D065036G...
Page 270: ...Wiring Diagrams SiUS331604E 257 Appendix VAM1200GVJU 3D073270C...
Page 271: ...Revision History Month Year Version Revised contents 06 2016 SiUS331604E First edition...
