Cooling operation, Ts +, +1.0, +0.5, Tsc

Item

Operation flow and applicable data, etc.

Description

1.Basic 2. Cooling/Heating operation

operation

The operations are performed in the following parts by controls according to cooling/heating conditions.

1)Receiving the operation ON signal of the remote controller, the cooling or heating operation signal starts being transferred form the indoor controller to the outdoor unit.

2)At the indoor unit side, the indoor fan is operated according to the contents of “2. Indoor fan motor control” and the louver according to the contents of “9. Louver control”, respectively.

3)The outdoor unit controls the outdoor fan motor, compressor, pulse motor valve and 4-way valve according to the operation signal sent from the indoor unit.

*1. The power coupler of 4-way valve is usually turned off, and it is turned on during defrost operation. (Only in heating)

Operation ON

Setup of remote controller

Indoor unit control

Indoor fan motor control / Louver control

Sending of operation command signal

Compressor revolution control / Outdoor fan motor control /

4-way valve control

In cooling operation: ON

Outdoor unit control

[

In heating operation: OFF ]

Pulse motor valve control

3. AUTO operation

1) Detects the room temperature (Ta) when

Selection of operation mode

the operation started.

2) Selects an operation mode from Ta in

As shown in the following figure, the operation starts by

selecting automatically the status of room temperature

the left figure.

(Ta) when starting AUTO operation.

3) Fan operation continues until an

*1. When reselecting the operation mode, the fan

operation mode is selected.

speed is controlled by the previous operation mode.

4) When AUTO operation has started

within 2 hours after heating operation

stopped and if the room temperature is

Cooling operation

20°C or more, the fan operation is

performed with ”Super Ultra LOW” mode

Ts + 1

for 3 minutes.

Monitoring (Fan)

Then, select an operation mode.

5) If the status of compressor-OFF

Ts – 1

continues for 15 minutes the room

Heating operation

temperature after selecting an operation

mode (COOL/HEAT), reselect an

operation mode.

4. DRY operation

1) Detects the room temperature (Ta) when

DRY operation is performed according to the difference

the DRY operation started.

between room temperature and the setup temperature as

2) Starts operation under conditions in the

shown below.

left figure according to the temperature

In DRY operation, fan speed is controlled in order to

difference between the room tempera-

ture and the setup temperature (Tsc).

prevent lowering of the room temperature and to avoid air

Setup temperature (Tsc)

flow from blowing directly to persons.

= Set temperature on remote controller

[˚C]

(Ts) + (0.0 to 1.0)

3) When the room temperature is lower

L– (W5)

1°C or less than the setup temperature,

turn off the compressor.

+1.0

(W5+W3) / 2

+0.5

SL (W3)

Tsc

Fan speed

– 27 –

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