Panasonic CU-4KE24NBU Low Start Current, Compressor Temperature Control, Control at HEAT Start-up

7-2-3. 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.

7-2-4. 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.

7-2-5. Control at HEAT Start-up

If HEAT operation is started when the outdoor air temperature is 59 °F or below, the unit operates at the HEAT start-up frequency (70 Hz or above).

Reset conditions

(1)The compressor frequency exceeds the start-up frequency of (70 Hz).

(2)The compressor thermostat is OFF.

(3)Frequency reduction for indoor high-load control has occurred.

(4)The outdoor air temperature is above 59 °F.

(5)The main-unit switch on one or more indoor units is set to TEST run.

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