Panasonic CU-3KS19NBU Service Manual download pdf (Page 66)

Control/conditions

COOL

The ON/OFF operation

button on the remote

controller is pressed.

The room temperature

has reached the

desired temperature.

The outdoor unit does not operate for 3 minutes

even after the breaker is turned ON.

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

compressor.

The outdoor unit starts.

(Compressor and the outdoor fan start.)

When the frequency reaches Hz,

frequency increases are stopped for a period

of seconds. (Refer to Table 1.)

If the indoor and outdoor temperatures are high,

the current peak cut-off activates, stopping

any increases in frequency.

The frequency then increases.

Operating frequency is stabilized in order to

maintain a comfortable environment.

The indoor temperature and the desired

temperature are approximately equal.

The thermostat turns

ON again.

After 3 minutes, the outdoor unit begins operating

automatically.

During these 3 minutes, a pressure balance is

achieved, allowing the compressor to start

more easily.

After the thermostat turns ON again, the

outdoor unit will not operate for 3 minutes,

even if the room temperature increases

above the desired temperature.

Operation is restarted

within 4 hours (only when

AUTO mode is selected

with the remote

controller).

Within 4 hours after operation was stopped, it is

assumed that there has been no significant

change in the indoor and outdoor temperatures,

and the previous conditions (COOL) are stored.

Starts operating in the same operating mode

(COOL) and with the same temperature

settings as before operation was stopped.

Operation starts after 4

hours or more have

passed.

New operating mode is determined based on

the temperature conditions at the time the

ON/OFF operation button is pressed.

Stop All indicator lamps turn OFF. The indoor and

outdoor units stop.

Freeze prevention In order to protect against freezing, the

compressor stops temporarily, until the

temperature of the indoor heat exchanger has

risen.

The thermostat turns

OFF.

The outdoor unit stops. (It does not stop if the

thermostart for another indoor unit is ON.)

Unit operation Explanation

The operation lamp illuminates.

The indoor fan operates at the set fan speed.

The outdoor unit stops.

When the temperature of the indoor heat

exchanger drops to approximately 35.6 °F

or below, the compressor turns OFF, the

outdoor fan turns OFF, and the indoor fan

continues operating with no changes.

Approximately 3 minutes later, if the

temperature of the indoor heat exchanger

is adove 46.4 °F, the system returns to its

original conditions.

The frequency is increased at the rate of 0.5

Hz every 1 seconds.

Frequency control

(Hz)

(25) Hz

(35) Hz

(45) Hz

(55) Hz

Outdoor air temperature is below 32 °F.

(120) seconds

(60) seconds

(180) seconds

Table 1

(senconds)

Outdoor air temperature is 32 °F or higher.

(60) seconds

(30) seconds

(90) seconds

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 113 114

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Panasonic CU-3KS19NBU Service Manual Page 66

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