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Control Specification
SiUS04-924
Function and Control 29
Indoor Frequency Command (
D signal)
The difference between the room temperature and the temperature set by the remote controller will
be taken as the “
D signal” and is used for frequency command.
Th OFF = Thermostat OFF
Frequency Initial Setting
Outline
When starting the compressor, or when conditions are varied due to the change of the room, the
frequency must be initialized according to the total of a maximum
D value of the indoor unit and
the Q value of the indoor unit.
Q value: Indoor unit output determined from indoor unit volume, airflow rate and other factors.
PI Control (Determine Frequency Up/Down by
D Signal)
1. P control
Calculate
D value in each sampling time (20 seconds), and adjust the frequency according to
its difference from the frequency previously calculated.
2. I control
If the operating frequency is not changed more than a certain fixed time, adjust the frequency up
and down according to the
D value, obtaining the fixed
D value.
When the
D value is small...lower the frequency.
When the
D value is large...increase the frequency.
3. Limit of frequency variation width
When the difference between input current and input current dropping value is less than 1.0 A,
the frequency increase width must be limited.
4. Frequency management when other controls are functioning
When frequency is dropping;
Frequency management is carried out only when the frequency drops.
For limiting lower limit
Frequency management is carried out only when the frequency rises.
5. Upper and lower limit of frequency by PI control
The frequency upper and lower limits are set depending on indoor unit.
When low noise commands come from the indoor unit or when outdoor unit low noise or quiet
commands come from indoor unit, the upper limit frequency must be lower than the usual
setting.
Temperature
difference
°F(°C)
D
signal
Temperature
difference
°F(°C)
D
signal
Temperature
differenc
°F(°C)
D
signal
Temperature
difference
°F(°C)
D
signal
0
Th
OFF
3.6 (2.0)
4
7.2 (4.0)
8
10.8 (6.0)
C
0.9 (0.5)
1
4.5 (2.5)
5
8.1 (4.5)
9
11.7 (6.5)
D
1.8 (1.0)
2
5.4 (3.0)
6
9.0 (5.0)
A
12.6 (7.0)
E
2.7 (1.5)
3
6.3 (3.5)
7
9.8 (5.5)
B
13.5 (7.5)
F
Summary of Contents for FTXS30HVJU
Page 1: ...SiUS04 924 Applied Models Inverter Pair Heat Pump Inverter Pair Wall Mounted Type H Series ...
Page 8: ...SiUS04 924 List of Functions 1 Part 1 List of Functions 1 List of Functions 2 ...
Page 10: ...SiUS04 924 Specifications 3 Part 2 Specifications 1 Specifications 4 ...
Page 50: ...Control Specification SiUS04 924 Function and Control 43 ...
Page 53: ...Instruction SiUS04 924 46 Operation Manual 2 Instruction 2 1 Remote Controller ...
Page 54: ...SiUS04 924 Instruction Operation Manual 47 operation ...
Page 55: ...Instruction SiUS04 924 48 Operation Manual 2 2 AUTO DRY COOL HEAT FAN Operation ...
Page 56: ...SiUS04 924 Instruction Operation Manual 49 ...
Page 58: ...SiUS04 924 Instruction Operation Manual 51 fins fins fins fins angles Inside ...
Page 60: ...SiUS04 924 Instruction Operation Manual 53 2 5 INTELLIGENT EYE Operation fins above ...
Page 61: ...Instruction SiUS04 924 54 Operation Manual ...
Page 62: ...SiUS04 924 Instruction Operation Manual 55 2 6 POWERFUL Operation ...
Page 63: ...Instruction SiUS04 924 56 Operation Manual 2 7 OUTDOOR UNIT QUIET Operation ...
Page 64: ...SiUS04 924 Instruction Operation Manual 57 2 8 ECONO Operation ...
Page 65: ...Instruction SiUS04 924 58 Operation Manual 2 9 TIMER Operation ...
Page 66: ...SiUS04 924 Instruction Operation Manual 59 ...
Page 69: ...Instruction SiUS04 924 62 Operation Manual ...
Page 70: ...SiUS04 924 Instruction Operation Manual 63 ...
Page 71: ...Instruction SiUS04 924 64 Operation Manual ...
Page 72: ...SiUS04 924 Instruction Operation Manual 65 3P228444 2B ...
Page 193: ...SiUS04 924 187 Appendix Part 9 Appendix 1 Piping Diagrams 188 2 Wiring Diagrams 189 ...