Daikin RZQ100B8V3B Service Manual page 138

Outdoor Unit Functional Concept
3.3.9 Inverter Cooling Fin Temperature Control
1
Outline
2
Flow chart
3
Parameters
4
5
2–54
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.
Normal operation
Inverter upper limit frequency
= Maximum frequency
RZQ71B8V3B
A°C 82°C
B°C 79°C
≥
Inverter fin temperature A°C
Compressor frequency
–1 step/2 min
Fin Temperature
≤
B°C lasts for 2 minutes
RZQ100~125B8V3B
74°C
71°C
ESIE05-03
Compressor frequency
–1 step/6 sec
RZQ100~140B7W1B
71°C
68°C
Part 2 – Functional Description