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COOL mode of "I FEEL CONTROL"
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ON
ON
Compressor &
OFF
1
OFF
Outdoor fan motor
I
ON
Runs all \he time in cooling mode
Indoor fan motor
NOTE
Coil frost prevention during COOL mode of 'I FEEL CONTROL".
There are two types of controls in coil frost prevention.
@ Temperature control
<MS09>
When the indoor coil thermistor RTI 2 reads 47°F or below for 5 min., the coil frost prevention starts. The compressor stops
and the indoor fan operates at set speed or AUTO speed for 5 min. After that if RTI 2 still reads 47°F or below, this function
is prolonged until RTI 2 reads over 47°F.
<MS12/15>
MS12/15 have two indoor coil thermistors RTI 2 and RTI 4. When RTI 2 (or RTI 4) reads 50°F or below for 5 min., the
coil frost prevention starts. The compressor stops and the indoor fan operates at set speed or AUTO speed for 5 min. After
that, if RT12 (or RT14) still read(s) 50°F or below, this function is prolonged until RT12 (or RT14) read(s) over 50°F.
@ Time control
When the three conditions below have been satisfied for 1 hour and 45 minutes, the compressor stops for
3
minutes and
the coil frost prevention mode starts.
(a)The compressor is on continuously.
(b)The indoor fan speed is LO or MED.
(c)The room temperature is below 79°F.
If the compressor turns off half way, the accumulated time is cancelled.
Time counting starts from the beginning when the above three conditions are satisfied again.
If the indoor fan speed becomes HI or the room temperature exceeds 79"F, time counting stops temporarily.
Time counting restarts from the stop point when the above three conditions are satisfied again.
The indoor fan operates at the set speed.
*Indoor fan operates at the set speed by FAN CONTROL switch.
Followings are' the fan speed in AUTO.
Room temperature minus set temperature : 4 to 7 deg.("F) or over-.........--HI
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- - - - - - - - - -
Room temperature minus set temperature : 2 to 7 deg.("F)
..--.-....-.....--.-.
MED
- - - - . -
t
4 deg. 7 deg
Room temperature minus set temperature : 2 to 3 deg.('F) or below -....-.LO
- - -
-
-
f
2deg.
3deg.
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DRY mode of "I FEEL CONTROL"
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The system uses the same refrigerant circuit as the cooling circuit for dry operation.
The compressor and the indoor fan are controlled by both temperature and the microprocessor.
By such controls, indoor flow amounts will be reduced in order to lower humidity without much room temperature decrease.
The operation of the comp. and indoor fan is as follows on the next page.
1. When the room temperature is 73°F or over
Compressor operates by temperature control and time control.
For the first 2 min. the system is FAN mode and the indoor fan operates at very low speed.
Then 2 min. later, the room temperature is read as the initial temperature.
@Set temperature is controlled to fall by 2°F as initial set temperature.
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