Electra OU10-47T ST Manual de servicio descargar pdf (Pagina 40)

CONTROL SYSTEM

11-5

SM SAFRPM 1-A.0 GB

11.8 “SLEEP” mode

When the SLEEP button is pressed, the SLEEP mode is selected as following:

1. The indoor fan speed is set at the low speed, the power lamp and the sleep lamp is on, the

temperature off after 5 minutes.

2. When selecting COOLING/DRY operation with SLEEP mode, the set temperature will be raised by

C 1 hour later and 2

C 2 hour later.

3. When selecting HEATING operation with SLEEP mode, the set temperature will be dropped by 1

1 hour later and 2

C 2 hour later.

4. After the system operates in SLEEP mode for 8 hours, it will stop automatically.

11.9 Fan motor control

(1) Rotational frequency feedback control

The indoor fan motor is equipped with a rotational frequency sensor, and outputs signal to the

microprocessor to feedback the rotational frequency. Comparing the current rotational frequency with

the target rotational frequency, the microprocessor adjusts fan motor electric to make the current

rotational frequency close to the target rotational frequency. With this control, when the fan speed is

switched, the rotational frequency changes smoothly.

(2) When the rotational frequency feedback signal has not output for 5 seconds (or when the

microprocessor can’t detect the signal for 5 seconds), the fan motor is regarded locked-up. Then the

electric current to the fan motor is shut off. 10 second later, the electric current is applied to the fan

motor again. During the fan motor lock-up, the POWER indicator lamp flashes on and off 6 times/cycle

or E6 to show the fan motor abnormality.

11.10 Auto fan speed control

11.10.1 When the auto fan speed is selected,

the indoor fan motor speed is automatically controlled by the room temperature and the set

temperature.

11.10.2 In COOLING mode,

the indoor fan motor operates as following:

11.10.3 In HEATING mode, the indoor fan motor operates as following:

11.11 Auto vane operation control

11.11.1 Vane motor drive

The unit is equipped with a stepping motor for the vane. The rotating direction, speed, and angle of the

motor are controlled by pulse signal transmitted from indoor microprocessor.

Fan Speed

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Electra OU10-47T ST Manual de servicio Pagina 40