Frequency control

 

 

(Hz)

 

(senconds)

 

 

 

 

 

 

 

 

 

 

Outdoor air temperature is below 32 °F.

Outdoor air temperature is 32 °F or higher.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(25) Hz

 

(120) seconds

(60) seconds

 

 

 

 

 

 

 

 

 

 

(35) Hz

 

(60) seconds

(30) seconds

 

 

 

 

 

 

 

 

 

 

(45) Hz

 

(60) seconds

(30) seconds

 

 

 

 

 

 

 

 

 

 

(55) Hz

 

(180) seconds

(90) seconds

 

 

 

 

 

 

 

 

 

 

 

 

Table 2

 

 

(1/f fluctuation fan)

 

 

 

 

 

 

 

 

 

 

 

 

Control/conditions

 

Unit operation

Explanation

 

 

 

 

 

 

 

SENSOR

The ON/OFF operation

The operation lamp illuminates.

The outdoor unit does not operate for 3 minutes

DRY

button on the remote

The indoor fan operates at the set fan speed.

even after the breaker is turned ON.

 

controller is pressed.

The outdoor unit stops.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The outdoor unit starts.

The frequency is increased at the rate of 0.5

 

 

 

 

 

Hz every 1 seconds.

 

 

 

(Compressor and the outdoor fan start.)

 

 

 

 

 

 

 

 

 

 

 

 

When the frequency reaches Hz,

This is in order to stabilize the return of oil to the

 

 

 

frequency increases are stopped for a period

compressor.

 

 

 

of seconds. (Refer to Table 2.)

 

 

 

 

 

 

 

 

 

 

 

 

The frequency then increases.

If the indoor and outdoor temperatures are high,

 

 

 

 

 

the current peak cut-off activates, stopping

 

 

 

 

 

any increases in frequency.

 

 

 

 

 

 

 

 

The room temperature

DRY operation starts

Operating frequency is stabilized in order to

 

reaches the desired

 

 

maintain a comfortable environment.

 

temperature, and there

DRY A operation

 

 

 

is no need for further

 

 

 

 

 

 

 

 

cooling.

The indoor fan changes between "Low"

Operates to effectively dehumidify the air while

 

 

 

 

 

 

and "LL" (very low) over a 6-minute cycle.

not excessively reducing the indoor

 

 

 

This is 1/f fluctuation fan operation.

temperature.

 

 

 

(Refer to Fig. 2.)

The indoor unit operates at 1/f fluctuation fan

 

 

 

 

 

 

 

 

 

 

operation, at a fan speed that does not cause

 

 

 

 

 

a chilly feeling.

 

 

 

 

 

 

 

 

The room temperature is

DRY B operation

 

 

 

59 °F or higher, and is

 

 

 

 

 

slightly too cold.

(1) The indoor fan changes between "Low"

The compressor operates on a 3-minutes ON,

 

 

 

and "LL" (very low) over a 6-minute cycle.

6-minutes OFF cycle, to prevent the room

 

 

 

This is 1/f fluctuation fan operation.

temperature from dropping too much.

(2)

After appoximately 3 minutes, the

 

 

compressor turns OFF, the outdoor fan

 

 

turns OFF, and the indoor fan turns OFF.

 

(3)

After approximately 6 minutes, the

 

 

conditions return to (1).

 

 

 

 

The room temperature is

Monitoring operation begins.

When monitoring operation begins, the

below 59 °F.

 

compressor stops, and the indoor fan operates at

 

 

"LL" (very low) speed.

74

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Panasonic CU-3KE19NBU, CU-4KE31NBU, CU-4KE24NBU service manual Fluctuation fan, Frequency control

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