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Control Specification
SiUS091133
43
Function and Control
3.2
Frequency Control
Outline
Frequency is determined according to the difference between the room thermistor temperature and
the target temperature.
The function is explained as follows.
1. How to determine frequency
2. Frequency command from the indoor unit (Difference between the room thermistor temperature
and the target temperature)
3. Frequency initial setting
4. PI control
Detail
How to Determine Frequency
The compressor’s frequency is determined by taking the following steps.
For Cooling Only Model
1. Determine command frequency
Command frequency is determined in the following order of priority.
1. Forced cooling
2. Indoor frequency command
2. Determine upper limit frequency
The minimum value is set as an upper limit frequency among the frequency upper limits of the
following functions:
Compressor protection, input current, discharge pipe temperature, freeze-up protection.
3. Determine lower limit frequency
The maximum value is set as a lower limit frequency among the frequency lower limits of the
following function:
Pressure difference upkeep.
4. Determine prohibited frequency
There is a certain prohibited frequency such as a power supply frequency.
For Heat Pump Model
1. Determine command frequency
Command frequency is determined in the following order of priority.
1. Limiting defrost control time
2. Forced cooling
3. Indoor frequency command
Command frequency
Limit frequency
Skip control
Lower limit function
Four way valve operating compensation (
∗
), etc.
Initial frequency
PI control
Defrost control (
∗
)
Dropping function
Input current control, etc.
Upper limit function
Compressor protection function
Upper limit frequency
FMAX
Lower limit frequency
FMIN
Target frequency
(R14717)
When the shift of the frequency is less than zero (
Δ
F<0) by PI control,
the target frequency is used as the command frequency.
(
∗
): only for heat pump models
Содержание FTXS30LVJU
Страница 8: ...SiUS091133 Table of Contents vii...
Страница 11: ...SiUS091133 1 List of Functions Part 1 List of Functions 1 Functions 2 1 1 FTXS Series 2 1 2 FDXS Series 4...
Страница 15: ...SiUS091133 5 Specifications Part 2 Specifications 1 Specifications 6 1 1 FTXS Series 6 1 2 FDXS Series 11...
Страница 164: ...SiUS091133 Check Service Diagnosis 154 15 18 class 24 30 36 class Power module R16697 R16073 Power module...
Страница 259: ...Indoor Unit FTXS30 36LVJU SiUS091133 249 Removal Procedure 6 Disconnect the connector Step Procedure Points R9558...
Страница 413: ...Wiring Diagrams SiUS091133 403 Appendix...