3. Compressor Control
W-2WAY ECO-i SYSTEM Control Functions
3-3. Compressor Capacity Control
The compressor operating conditions vary depending on the indoor unit operating conditions and the effects of indoor heat load, outdoor temperature and other factors. Unit No. 1 (CCU) calculates the required capacity accord- ing to these operating conditions, and allocates the capacity requirement among the outdoor units, according to the compressor start/stop rules. Fine adjustments to system capacity control are made by the inverter compressors. (Depending on the conditions, all inverter compressors may be operating for fine adjustment.)
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(1)The inverter compressor has a center limit value and upper limit value for the operating frequency. These limits are set for each outdoor unit capacity.
(2)The inverter frequency during operation may be lower than the frequency listed above due to overload current protection control.
*If Quiet mode is selected, the inverter may stabilize at a frequency lower than those stated above. For information about Quiet mode, refer to the field application functions.
*If the Power Demand Mode is selected, the inverter may stabilize at a frequency lower than those stated above. Refer to the Field Application Function for the detail.
3-5. Forced Compressor Stop
Once a compressor stops, it will not start for a period of 3 minutes
3-6. Roadmap Control
(1)The below mentioned Roadmap Control are performed according to the pressure sensor on the outdoor unit, and the 2 temperature sensors attached to the indoor unit heat exchanger coil.
* With the roadmap control in heating mode, the pressure detected by the pressure sensor at high pressure side is converted to the saturation temperature. This converted saturation temperature is called the “High Pressure Saturated Temperature”.
(2)This control is performed every 15 seconds.
(3)The evaporation temperature control and the temperature used to determine the area (A, AB, B, C) for the con- densation control shown in the figure on the next page, may vary depending on the relationships among factors including the difference between the room temperature setting and the air intake temperature (=air intake tem- perature difference) and the difference between the air discharge temperature setting and the air discharge temperature (=air discharge temperature difference).
(4)Definitions of evaporation temperature and condensation temperature
Evaporation temperature (Te): Lowest heat exchanger temperature (E1, E3) at any indoor unit
Condensation temperature (Tc): Highest temperature among the outdoor unit pressure sensor temperature and the heat exchanger temperatures (E1) at all indoor units where the heating thermostat is ON.
Ordinarily, this is the outdoor unit pressure sensor temperature. (If multiple outdoor units are connected, this is the highest outdoor unit pressure sensor temperature. )
*E3 temperature in heating mode is not used for the condensation temperature detection, because it may indi- cate the temperature of superheated gas.
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