Argo 387006118 Technical Data & Service Manual - Page 9

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4. FUNCTIONS

4-1. Operation Functions

■ Functions of the main unit controller

1 OFF

: • Used to stop the unit when the remote

(Self-diagnostics)

controller is unavailable.

• Used when service inspection is performed.

2 ON

: • During normal operation: Starts operation

from the remote controller.

• Emergency operation: When the remote

controller is unavailable, moving this switch

from the OFF position to the ON position

starts automatic operation.

3 TEST

: • Used when operating performance are

checked.

• Used when pump-down is carried out.

(Operates at the rated frequency. At this

time, the main unit lamp flashes, and the

remote controller signal cannot be

received.)

4 DEMO

: • This function is for shop displays. Ordinarily

it is not used.

• Used during servicing.

■ Automatic operation

● Operating mode selection

When automatic operation is selected, the indoor and outdoor

temperature sensors function, and either HEAT, DRY, or COOL

mode operation is selected automatically.

Indoor temperature

15°C

(Approx.)

22°C

20°C

HEAT

mode

18°C

• When multiple indoor units are connected and this unit is

started while another indoor unit is operating, the operating

mode is as shown in the table below.

Operating mode

before change

operating mode

HEAT

COOL

DRY

• If the remote controller is used to start automatic operation, a

differing-mode check is performed if the operating modes are

not the same.

● Desired-temperature memory

• The set temperature in the program can be changed as

desired within the range of ±4°C. This temperature can then

be stored. During automatic operation, press the temperature

setting buttons to change the temperature.

Set

temperature

22°C

27°C

(standard)

27°C

COOL

mode

Temperature

DRY

at which

mode

operation

starts

(Range:

20 – 26°C)

24°C

Multi

Operating mode

after change

COOL

DRY

HEAT

■ SENSOR DRY

During automatic operation, the system adjusts the room

temperature and fan speed according to the conditions in the

room, in order to maintain a comfortable room environment.

SENSOR DRY operation

• DRY operation is as shown in the figure below.

Load

COOL zone

A zone

B zone

Conditions are monitored at all

times when the room temperature

is below 15°C.

DRY A

The compressor operation frequency varies depending on the

relative humidity.

The indoor fan operates with 1/f fluctuation.

DRY B

The compressor operates at a low operating frequency.

The indoor fan operates with 1/f fluctuation.

Monitor

• Monitoring operation takes place when the room temperature

is below 15°C.

• When the monitoring range is entered, the compressor stops,

and the indoor fan operates at LL.

■ PAM-α control

• In order to further improve inverter performance, control is

switched between PWM control at low operation speeds, and

PAM control at high operation speeds, making the most

effective use of power.