Service manual
Compressor operates by temperature control and time control.
In the
first
2 min. the system is FAN mode and the indoor fan operates at VLO speed.
Then
2
min. later, the room temperature is read as the initial temperature.
@Set temp. is controlled to minus 2'F as initial set temp.
@When the thermostat is ON, the compressor repeats
8
min. ON/3 min. OFF cycle operation.
When the thermostat is OFF, the compressor repeats
4
min. OFF/1 min. ON cycle operation.
lndoor fan and outdoor operate in same cycle with compressor.
Indoor fan speed is VLO.
Operation
Time
Chart
1st
ON ON
Example
NOTE
*Coil frost prevention during DRY mode of
"I
FEEL CONTROL"
The operation is same as coil frost prevention during COOL mode of "I FEEL CONTROL" except the indoor
fan speed is VLo.
*In DRY mode of
"I
FEEL CONTROL", FAN CONTROL switch is not available.
OFF
Thermastet
!
ON ON
:
ON
Indoor
fan
OFF OFF
I
VLO
speed
.
,
,
.
.
#
,*
,
.
,
. .
,
. .
,
ON
j
:
ON
:
ON
.
.
,
,
-
HEAT
mode
of
"I
FEEL CONTROL"
-
1.
Indoor
fan
speed
control
(1) Following are the fan speed in AUTO.
Temperature condition Fan speed
Room temp. minus
set
temp.
:
more than 4
-
7 deg.
............
HI
Room temp. minus set temp.
:
2
-
7
deg.
..............................
MED
Room temp. minus set temp.
:
less than 2
-
3 deg.
............-..
LO
(2) Cold air prevention control
The defrost lamp lights by the fan control.
The fan runs when the indoor coil thermistor RT12 temp. exceeeds 7TF, when the temp. is below 64F, the fan stops.
(3) New warm air control.
C
When compressor starts in heating operation or after defrosting, the fan changes the speed due to the indoor coil
thermistor RT12 temp. to blow out warm air.
After releasing of cold air prevention, when the indoor coil thermistor RT12 is 1
13'F or above, the fan speed shifts to the
set
speed.
When the indoor coil thermistor RTI 2 is less than 1 13F, the fan speed is controlled by time as below.
Time condition Indoor fan speed
less
than
4
min
.........................
Lo
4
min. to
8
min.
........................
MED
more than
8
min.
........................
HI
The upper limit of the fan speed is the setting speed.
If the thermostat turn off, this operation changes to flow
soft
control.
(4) Flow
soft
control
After a compressor turn off by the thermostat, the indoor fan operates at a lower speed than LO.
NOTE
:
This speed is called Very Low (VLO) in this manual. When the compressor runs, the fan operates at the setting
speed. Due to the cold air prevention control, the fan does not start until the indoor coil thermistor RTI 2 temp.
exceeds 72'F.
(5)
If turn off the POWER button during heat operation, the indoor fan operates for 30
sec.
LO
speed
to eliminate heat.
1
OFF
I
:
Outdoor
fan
OFF
i
cornpresrror
OFF
I
i
1
m
:
I
2
8rnin.
-
:
i
7