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SDi Decades Extreme Service Manual www.ecoer.com
May. 2023Manufacturer reserves the right to change specifications or designs without notice.
7.3.3 Cooling Mode
7.3.3.2 Indoor Fan Control
1) In cooling mode, the indoor fan operates continuously. The fan speed can be set to low, medium, high, turbo
and auto.
2) Auto fan action in cooling mode:
• Descent curve
• When T1-Tsc is lower than or equal to 7℉, fan speed reduces to high;
• When T1-Tsc is lower than or equal to 2℉, fan speed reduces to medium;
• When T1-Tsc is lower than or equal to 1℉, fan speed reduces to low;
• Rise curve
• When T1-Tsc is higher than 2℉, fan speed increases to medium;
• When T1-Tsc is higher than 3℉, fan speed increases to high;
• When T1-Tsc is higher than 8℉, fan speed increases to turbo.
7.3.3.3 Outdoor Fan Control
• The outdoor unit will be run at different fan speed according to T4 and compressor frequency.
• For different outdoor units, the fan speeds are different.
7.3.3.4 Condenser Temperature Protection
When the condenser temperature exceeds a configured value, the compressor stops operation.
7.3.3.5 Evaporator Temperature Protection
When evaporator temperature drops below a configured value, the compressor and outdoor fan stop operation.
7.3.4.1 Compressor Control
• If the following conditions are satisfied, the compressor stops operation.
• When the frequency value calculated through GA algorithm is negative compensation.
• T1 is less than or equal to (Tsc-CDIFTEMP). CDIFTEMP is a parameter of EEPROM.
• Compressor running time is greater than or equal to 10 minutes. If compressor running time is less than 10
minutes, even if the above shutdown conditions are met, the compressor cannot be turned off, but will maintain
operation in the minimum frequency FminH(until the running time is over 10 minutes).
• If one of the following conditions is satisfied, the minimum compressor running time(10mins) could be
ignored.
• Compressor running frequency fr is greater than test frequency TestFre.
• When compressor running frequency fr is equal to test frequency TestFre, T4 is greater than or equal to
59℉ or T4 fault.
• Changing remote controller setting temperature.
• Turn on or off these functions: Turbo function, Sleep function, Mute function.
• Any protection occurs.
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