Normal Operation
SiAF341904E
84
Part 4 Functions and Control
5.3 Compressor Capacity Control
Te: Low pressure equivalent saturation temperature
Capacity steps
The compressor rotation speed is changed according to the control pressure.
Cooling: suction pressure sensor value is converted into evaporation saturated temperature
(relation between pressure and evaporating temperature based on characteristics of
refrigerant R-410A). For detailed explanation refer to chapter field settings (
Details of
Setting Mode (m2)
on page 143 and installation manual outdoor chapter Energy saving and
optimum operation).
Initial selection is made between Automatic, Fixed or High sensible.
During operation, the outdoor target evaporating temperature can be changed based on
the selected sub function, taking indoor load into account.
The initial target saturated temperature can be changed. For details refer to
Details of
Setting Mode (m2)
on page 143 for Cooling: Te set based on field setting 2-8.
During operation, outdoor control will take into account the pressure drop so that at indoor
units, the preset target temperature is reached (average). The estimated pressure drop is
calculated based on:
Pressure drop characteristics found during test-operation outdoor (step 7). At several
evaporating temperatures, outdoor control stores difference between outdoor
evaporating temperature and average of indoor heat exchanger (indoor evaporating
temperature).
To have judgment of gas speed in main suction pipe, control takes the capacity step of
the outdoor unit into account. In function of pressure drop characteristics at the different
compressor capacity steps, control concludes the category of system pipe lay out (long,
medium, short).
Target Te outdoor (cooling) = Te set – estimated pressure drop –
A
.
Correction factor
A
depends on the absolute value of the difference between indoor air inlet
temperature and a set temperature after startup period.
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...