Panasonic CU-4KS31NBU Low Start Current, Compressor Temperature Control, Current control

(2) Current control

The operating frequency upper limits shown in the figure below are established for frequency reduction and increase-prohibit.

Current(A) Example of operation during cooling

	Trip	Hz reduction
Hz reduction
		Hz increase prohibit
Hz increase
	prohibit
	(16)	Hz reduction
		Hz increase prohibit
	(15.6)
	0	Frequency (Hz)
		(30)
7-2-2.	Low Start Current

Operation starts at (8 Hz), and the start current is less than the normal operating current. This prevents the flickering of fluorescent lights or television screens that occurs when ordinary A/C units start.

7-2-3. Compressor Temperature Control

To protect the compressor coil from overheating, the operating frequency is controlled based on the compressor discharge temperature.

Compressor discharge temperature

(°F)

Trip

(230)

5Hz every 30 sec. reduction

(223)

2Hz every 30 sec. reduction

(212)

Increase

prohibit range

No control

(Hz reduction)

(194)

*Within the increase-prohibit range, the range changes to the Hz reduction range (2 Hz every 30 seconds) if the compressor temperature rises by 4 °F.

70