72 PB
OPERATION
Control logic description
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 stays 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.
Condenser High-temperature Protection
DC‑Inverter outdoor unit
AC will enter T3 protection if any of the following conditions is satisfied.
Condition 1:
Cooling mode: When the outdoor coil temp. T3 keeps higher than T2 for 10
seconds, the compressor and outdoor fan will shut off. When T3 is lower than
T1, the compressor and outdoor fan will restart up.
Condition 2:
Heating mode: When the saturation temperature which is got from high
pressure cycling) T3 stays higher than T2 for 10 seconds, the compressor and
outdoor fan will shut off. When T3 is lower than T1, the compressor and outdoor
fan will restart up.
Figure 404
Figure 405
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