Panasonic CU-3KS19NBU Service Manual download pdf (Page 70)

Current(A)

Frequency (Hz)

Trip

Hz reduction

Hz increase

prohibit

Hz reduction

Hz increase prohibit

Hz reduction

Hz increase prohibit

(16)

(15.6)

(30)

Example of operation during cooling

The operating frequency upper limits shown in the figure below are established for frequency reduction and

increase-prohibit.

(2) Current control

(230)

(223)

(212)

Trip

5Hz every 30 sec. reduction

2Hz every 30 sec. reduction

No control

Increase

prohibit range

(Hz reduction)

(°F)

Compressor discharge temperature

(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.

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.

7-2-2. Low Start Current

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

discharge temperature.

7-2-3. Compressor Temperature Control

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Panasonic CU-3KS19NBU Service Manual Page 70