-
183
-
'17 • SCM-T-225
(c) Operation check mode
There is no communication with the outdoor unit but it allows performing operation in respective modes by operating the
remote control.
(d) Drain pump test run mode
As the drain pump test run is established, the drain pump only operates and during the operation protective functions by
the microcomputer of indoor unit become ineffective.
(15) Cooling, dehumidifying frost protection
(a) To prevent frosting during cooling mode or dehumidifying mode operation, the of compressor speed is reduced if
the indoor heat exchanger temperature (detected with Thi-R) drops to 1.0°C or lower at 4 minutes after the start of
compressor operation. If the indoor unit heat exchanger temperature is 1.0°C or lower after 1 minutes, the compressor
speed is reduced further. If it becomes 2.5°C or higher, the control terminates. When the indoor heat exchanger
temperature has become as show below after reducing the compressor speed, it is switched to the fan operation. For the
selection of indoor fan speed, refer to item 2).
10
1.0
Indoor heat exchanger temperature (°C)
Fan operation
Cooling operation
SRC40~60
FDC100~140
Model
Symbol
A
4
4
1
1
1.0
1.0
2.5
2.5
B
C
D
(b) Selection of indoor fan speed
If it enters the frost prevention control during cooling operation (excluding dehumidifying), the indoor unit fan speed is
switched.
(i) In the case of FDUM only.
1) When the indoor return air detection temperature (detected with Thi-A) is 23°C or higher and the indoor
heat exchanger temperature (detected with Thi-R) detects the compressor frequency drop start temperature
A°C+1°C, of indoor unit fan speed is increased by 20 min
-1
.
2) If the phenomenon of 1) above is detected again after the acceleration of indoor unit fan, indoor unit fan speed
is increased further by 20 min
-1
.
Note (1) Indoor unit fan speed can be increased by up to 2 taps.
• Compressor frequency drop start temperature
Symbol
Item
A
Temperature - Low (Factory default)
1.0
Temperature - High
2.5
Note (1) Frost prevention temperature setting can be selected with the indoor unit function setting of the wired remote control.
(16) Heating overload protection
(a) If the indoor heat exchanger temperature (detected with Thi-R) at 63°C or higher is detected for 2 seconds continuously,
the compressor stops. When the compressor is restarted after a 3-minute delay, if a temperature at 63°C or higher is
detected for 2 seconds continuously within 60 minutes after initial detection and if this is detected 5 times consecutively,
the compressor stops with the anomalous stop (E8). Anomalous stop occurs also when the indoor heat exchanger
temperature at 63°C or higher is detected for 6 minutes continuously.
56
63
Indoor heat exchanger temperature (°C)
Compressor ON
Compressor OFF
(b) Indoor unit fan speed selection
If, after second detection of heating overload protection up to fourth, the indoor fan is set at Me and Lo taps when the
compressor is turned ON, the indoor fan speed is increased by 1 tap.
