Mitsubishi MS-18RV Service Manual download pdf (Page 38)

High

Med.

Low

High

9-5. 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

(High,Med.,Low), the microprocessor controls IC141(MS-18/24RV), SR141(MS-30RV) and adjusts fan motor electric

current 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) Fan motor lock-up protection

When the rotational frequency feedback signal has not output for 12 seconds, (or when the microprocessor cannot

detect the signal for 12 seconds) the fan motor is regarded locked-up. Then the electric current to the fan motor is shut

off. 3 minutes later, the electric current is applied to the fan motor again. During the fan motor lock-up, the OPERATION

INDICATOR lamp flashes on and off to show the fan motor abnormality. (Refer to page 49.)

9-3. DRY ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit

turns on with a beep tone.

(2) Select DRY mode with the OPERATION SELECT

button.

(3) The microprocessor reads the room temperature

and determines the set temperature. Set tempera-

ture is as shown on the right chart.

Thermostat (SET TEMP.) does not work.

The other operations are same as DRY mode of “I

FEEL CONTROL”.

(4) DRY operation will not function when the room tem-

perature is 13°C or below.

9-4. FAN( d )OPERATION

(1) Press OPERATE/STOP(ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit

turns ON with a beep tone.

(2) Select FAN mode with the OPERATION SELECT

button.

(3) Select the desired fan speed. When AUTO, it

becomes Low.

Only indoor fan operates. Outdoor unit does not

operate.

9-2. COOL ( ) OPERATION

(1) Press OPERATE/STOP(ON/OFF) button.

OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.

(2) Select COOL mode with the OPERATION SELECT button.

(3) Press the TEMPERATURE buttons.

(TOO WARM or TOO COOL button) to select the desired temperature.

The setting range is 16 ~ 31°C.

w Indoor fan continues to operate regardless of thermostat’s OFF-ON at set speed.

w Coil frost prevention is as same as COOL mode of “I FEEL CONTROL”.

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Mitsubishi MS-18RV Service Manual Page 38

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