Operation Time Chart; Heat Mode Of “I Feel Control” - Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

Operation time chart

Example
OFF
Thermostat
Indoor fan
OFF
Outdoor fan
OFF
Compressor
3. Coil frost prevention
• The operation is as same as coil frost prevention during COOL mode of "I FEEL CONTROL".
• Indoor fan operates at the set speed and the compressor stops for 5 minutes, because protection (Coil frost
prevention) has the priority.
However, when coil frost prevention works while the compressor is not operating, the speed becomes the set speed.
8-1-3. HEAT mode of "I FEEL CONTROL"
1. Indoor fan speed control
(1) In AUTO the fan speed is as follows.
Set temperature minus room temperature: 4 degrees or more ··········································High
Set temperature minus room temperature: Between 2 and 4 degrees· ·····························Med.
Set temperature minus room temperature: less than 2 degree··········································Low
(2) Cold air prevention control
MSZ09UN
1 When the compressor is not operating,
(1) if the temperature of indoor coil thermistor RT12 is 64°F or less, the indoor fan stops.
(2) if the temperature of indoor coil thermistor RT12 is more than 64°F, the indoor fan operates at Very Low.
2 When the compressor is operating,
(1) if the temperature of RT12 is 72°F or more, the indoor fan operates at set speed.
(2) if the temperature of RT12 is less than 72°F and
(1) if the temperature of room temperature thermistor RT11 is 59°F or less, the indoor fan stops.
(2) if the temperature of room temperature thermistor RT11 is more than 59°F, the indoor fan operates at Very
Low.
MSZ12UN
When the compressor is operating,
(1) if the temperature of indoor coil thermistor RT12 is less than 64°F or, the indoor fan operates at Very Low.
But if the temperature of room temperature thermistor RT11 is 59°F or less, the fan stops.
(2) if the temperature of indoor coil thermistor RT12 is more than 72°F, the indoor fan operates at set speed.
Indoor coil thermistor
RT12 temperature
NOTE : If the temperature of RT12 reads from 64°F to 72°F at the air conditioner starting and also after defrosting,
this control works.
ON
ON
ON
OFF
ON
ON
OFF
3 min.
8 min.
Initial temperature difference
Cold Air Prevention
OFF
ON
OFF
ON
OFF
4 min. 1 min.
Released
64°F 72°F
27
ON
Difference between room
temperature and set
temperature during
Fan speed
operation
4 deg. 7 deg.
2 deg. 3 deg.
Indoor fan speed
Set speed
Very Low or stop