Mitsubishi Electric MSZ-G09SV Service Manual page 53

9-15. 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 decided 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".
9-16. 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 temper-
ature and determines the set temperature.
Set temperature 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 temperature is 13°C or below.
9-17. HEAT ( ) OPERATION
(1) Press OPERATE/STOP(ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with the OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature.
The setting range is 16 ~ 31°C.
(4) Indoor fan speed control, outdoor fan control, high pressure protection, discharge temperature protection control,
defrosting, R.V. coil control are the same as HEAT mode of "I FEEL CONTROL".
9-18. 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 SR141 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 INDI-
CATOR lamp flashes on and off to show the fan motor abnormality. (Refer to page 70.)
9-19. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approx. 12V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode changes as follows by pressing the VANE button.
Rotational frequency
High
53
High
Med.
Low
time