-
172
-
(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 (Except FDK)
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.
(b)
Selection of indoor fan speed
If
it enters the frost prevention control during cooling operation (excluding dehumidifying), the indoor fan speed is
switched.
(i)
When
the indoor return air detection temperature (detected with Thi-A) is 18°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 fan speed is increased by 20min
-
1
.
(ii)
If the phenomenon of
(i) above is detected again after the acceleration of indoor fan, indoor fan speed is increased
further by 20min
-
1
.
Note (1) Indoor fan speed can be increased by up to 2 taps.
• Compressor frequency drop start temperature
Hs
>
50% Hs
≦
50%
Item
Symbol
Low High
Item
Symbol
Low High
A 1.0 2.5 A -0.5
1
.0
B 2.5 4.0 B
1
.0 2.5
Note (1) Frost prevention temperature setting can be selected with the indoor unit function setting of the wired remote control.
(14) Cooling, dehumidifying frost protection
(a)
T
o prevent frosting during cooling mode or dehumidifying mode operation, the compressor-OFF if the indoor heat
exchanger temperature (detected with Thi-R) drops to 1.0 °C or lower at 4 minutes after the compressor-ON. If the indoor
unit heat exchanger temperature is 1.0 °C or lower after 5 minutes, the indoor unit is controlled compressor-OFF. If it
becomes 10°C or higher, the control terminates. When the indoor heat exchanger temperature has become as show, the
indoor unit send outdoor unit the “Anti-frost” signal.
10A
Indoor heat exchanger temperature (°C)
Thermostat-OFF
5 minutes
Thermostat-ON capable
SRC40~60
FDC100~140
Model
Symbol
A
4
4
1
1
1.0
1.0
2.5
2.5
BC D
• Frost prevention temperature setting can be selected with the
indoor unit function setting of the wired remote control.
Symbol
Item
A
Temperature - Low (Factory default) 1.0
Temperature - High 2.5
-
125
-
'16 • PAC-T-251
(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 (Except FDK)
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.
(14) 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).
101.0
Indoor heat exchanger temperature (°C)
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 fan speed is
switched.
(i) When the indoor return air detection temperature (detected with Thi-A) is 18°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 fan speed is increased by 20min
-
1
.
(ii) If the phenomenon of (i) above is detected again after the acceleration of indoor fan, indoor fan speed is increased
further by 20min
-
1
.
Note (1) Indoor 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.
(15) 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 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.
(15) Anomalous fan motor
(a) After starting the fan motor, if the fan motor speed is 200min
-1
or less is detected for 30 seconds continuously and 4 times
within 60 minutes, then fan motor stops with the anomalous stop (E16).
(b) If the fan motor fails to reach at -50min
-1
less than the required speed, it stops with the anomalous stop (E20).
(16) Plural unit control – Control of 16 units group by one remote control
(a) Function
One remote control can control a group of multiple number of unit (Max. 16 indoor units). “Operation mode” which is set
by
the remote control can operate or stop all units in the group one after another in the order of unit. No.
(1)
. Thermostat and
protective function of each unit function independently.
Note (1) Unit No. is set by SW1, SW2, and SW5-2 on the indoor control PCB.
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