Service manual

Outdoor Unit Functional Concept ESIE05-03
2–54 Part 2 – Functional Description
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3.3.9 Inverter Cooling Fin Temperature Control
Outline This control will restrict the compressor upper limit frequency in order to protect the electronic
components in the switch box from overheating (L4-error activation).
By lowering the compressor frequency, the current drawn by the compressor will be reduced and as
a result the temperature inside the switch box will drop.
Flow chart
Parameters
Fin Temperature
≤ B°C lasts for 2 minutes
Normal operation
Compressor frequency
–1 step/2 min
Compressor frequency
–1 step/6 sec
Inverter fin temperature
≥ A°C
Inverter upper limit frequency
= Maximum frequency
RZQ71B8V3B RZQ100~125B8V3B RZQ100~140B7W1B
A°C 82°C 74°C 71°C
B°C 79°C 71°C 68°C
ESIE05-03.book Page 54 Wednesday, April 6, 2005 4:09 PM