16. Control logic description
65SS-SVM001A-EM
Compressor running rules:
When the unit starts up in cooling mode, the compressor starts to work, and adjust its operating
frequency according to the system target pressure and the actual pressure. If the actual
pressure is higher than the target pressure, the compressor frequency will rise; if the actual
pressure is lower than the target pressure, the compressor frequency decreases; when the
target pressure is reached, the compressor frequency will keep stable.
Outdoor fan running rules:
Once the outdoor fan starts up, it will follow the rules below:
Single outdoor fan: First, it will run in an invariable speed for a short time; Then it will regulate
the speed by the outdoor-coil temperature.
Double outdoor fan: If it has two outdoor fans, the upper fan regulates the speed by the rules,
and the downer fan speed is lower than the upper fan speed for 30rpm~60rpm.
16.3 Evaporator Low-temperature Protection
DC-Inverter
AC will enter T2 protection if any of the following condition is satisfied.
Condition:
Cooling mode: When the saturation temperature (which is got from low pressure cycling) T2
keeps lower than TE5 for 120 seconds, the compressor and outdoor fan will shut off. When T2 is
higher than TE6, the compressor and outdoor fan will restart up.
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