Inverter Cooling Fin Temperature Control - Daikin SkyAir Service Manual

Frequency Regulating Functions

4.10 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
74
Normal operation
Inverter upper limit frequency
= Maximum frequency
RZQ71C7,
RZQS71·100C7V1B
A°C
B°C
Inverter fin temperature
Compressor frequency
–1 step/2 min
82°C
79°C
≥
A°C
Compressor frequency
–1 step/6 sec
Fin Temperature
≤
B°C lasts for 2 minutes
RZQ100~140C7,
RZQS125·140C7V1B
83°C
80°C
Functional Description
SiBE28-804