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35
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(k)
Condensate pump motor (DM) Control [FDT and FDUM models only]
(a) Drain motor is started no sooner than the compressor is turned ON during cooling or dehumidifying operation. The drain
motor continues to operate for 5 minutes after the stop of unit operation, stop with the error stop, thermostat stop and at
switching from cooling or dehumidifying operation to blowing or heating operation. When there is any unit subjected to oil
return control, the drain motor is operated for 5 minutes at such occasion.
(b) Overflow detection is performed by the float switch at all times regardless of the operating mode. If the float switch
circuit is detected to be open continuously for 3 seconds (or when the float switch is disconnected or a wire is broken), an
abnormal stop (E9) is performed and the condensate pump motor runs until the float switch recovers.
(l)
Air flow mode control
Air flow mode control can be changed using DIP switch SW9-4 on the indoor PCB.
Abnormal stop
63
Indoor heat exchanger temperature(˚C)
56
Heating operation possible
Cooling operation
10
Indoor heat exchanger temperature (˚C)
1.0
Fan operation
SW9-4 OFF
(Mild Mode Control)
SW9-4 ON
(Powerful mode Control)
Air flow mode
Item
DIP SW
FDT, FDEN models
Hi, Me, Lo
UHi, Hi, Me
(m) Compressor inching prevention control
1) 3-minute timer
If the compressor stops due to operation of the thermostat, the Run switch on the remote controller or some trouble, it is not
restarted after 3 minutes. However, when the power is turned ON, the 3-minute timer becomes inactive.
2) 3-minute forced operation timer
a) For 3 minutes after the compressor goes ON, it does not stop. However, it will stop if the Run/Stop button is pressed
and through a change in the operation mode, it sill stop immediately when the thermostat goes OFF.
b) During 3-minute forced operation timer control in heating operation, if the thermostat goes OFF, the louver position
is set in the horizontal position.
Note (1) The compressor stops when protection control starts.
(n)
Heating overload porotection
If an overload condition is sensed continuously for 2 seconds by the indoor heat exchanger temperature during heating
(sensed by Thi-R1 or R2), the compressor is stopped. After a 3-minute delay, the compressor is restarted. If the overload is
sensed 5 times within 60 minutes of the first time it was detected, an abnormal stop is performed (E8). Also, if the overload
state is sensed continuously for 6 minutes, it results in an abnormal stop.
(o)
Frost prevention during cooling, dehumidification
In order to prevent frost during cooling and dehumidification, 3 minutes after compressor operation starts, if the indoor heat
exchanger temperature (sensed by Thi-R1 or R2) is 3.5˚C or lower for 30 seconds, the compressor’s speed is lowered. 30
seconds later, if the indoor heat exchanger temperature is 3.5˚C or lower, the speed is reduced still more. If the temperature
becomes lower than 3.5˚C continuously, this control is terminated. Furthermore, even if the compressor’s speed is lowered, if
the indoor heat exchanger becomes as shown in the diagram below, the unit switches to fan operation.
(p)
Thermistor (Air return, heat exchanger) disconnected wire detection.
If the temperature sensed by the thermistor is –50
°
C or lower continuously for 5 seconds, the compressor stops. After a 3-
minute delay, the compressor is restarted, but if a recurrence is detected within 60 minutes of the 1st time, or if it is sensed
continuously for 6 minutes, it results in an abnormal stop (E6, E7).
Notes (1) When the unit is shipped, SW9-4 is turned ON.
Notes
(2) If SW9-4 is ON, the fan operates in Me even during hot start and
when the heating thermostat is OFF.
SW9-4 OFF
(Standard)
SW9-4 ON
(High speed)
Air flow mode
Item
DIP SW
FDUM model
Hi, Me, Lo
UHi, Hi, Me
Notes (1) When the unit is shipped, SW9-4 is turned OFF.
Notes
(2) If SW9-4 is ON, the fan operates in Hi even during hot start and
when the heating thermostat is OFF.
