SiUS092230EA
Control Specification
Part 4 Functions and Control
81
PI Control
1.
P control
The
D value is calculated in each sampling time (20 seconds), and the frequency is adjusted
according to its difference from the frequency previously calculated.
2.
I control
If the operating frequency does not change for more than a certain fixed time, the frequency is
adjusted according to the
D value.
When
D value is low, the frequency is lowered.
When
D value is high, the frequency is increased.
3.
Frequency control when other controls are functioning
When frequency is dropping:
Frequency control is carried out only when the frequency drops.
For limiting lower limit:
Frequency control is carried out only when the frequency rises.
4.
Upper and lower limit of frequency by PI control
The frequency upper and lower limits are set according to the command of the indoor unit.
When the indoor unit quiet or QUIET OUTDOOR UNIT operation command comes from the
indoor unit, the upper limit frequency is lower than the usual setting.
5.3 Controls
at
Mode Changing/Start-up
5.3.1 Preheating Control
Outline
The inverter operation in open phase starts with the conditions of the outdoor temperature, the
discharge pipe temperature, the radiation fin temperature and the preheating command from the
indoor unit.
Details
Outdoor temperature
≥
–2.5°C (27.5°F)
Control A (preheating for normal state)
Outdoor temperature < –2.5°C (27.5°F)
Control B (preheating of increased capacity)
Control A
ON condition
Discharge pipe temperature < 0°C (32.0°F)
Radiation fin temperature < 85°C (185°F)
OFF condition
Discharge pipe temperature > 2°C (35.6°F)
Radiation fin temperature
≥
90°C (194°F)
Control B
ON condition
Discharge pipe temperature < 10°C (50.0°F)
Radiation fin temperature < 85°C (185°F)
OFF condition
Discharge pipe temperature > 12°C (53.6°F)
Radiation fin temperature
≥
90°C (194°F)
Summary of Contents for RX-W Series
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Page 239: ...SiUS092230EA Piping Diagrams Part 8 Appendix 233 RX24WMVJU9 3D141502 ...