GD Midea Refrigerant Equipment Co. Ltd Service manual for F Dehumidifier
3
2 Electronic function
2.1 When the unit is just powered on
When the unit is just powered on or the dropped
power is just restored, the unit will immediately
perform the self-diagnosis. The check items include
the water-full, temperature sensor and humidity
sensor. If there is no defect, the power indicator will
flash at 0.5Hz while all other indicators are off. All
buttons are invalid except the ON/OFF button.
2.2 Operating under setting humidity
When the ON/OFF button is pressed for the first
time after the unit is powered on or the power is just
restored from dropping, the unit will operate with a
original factory humidity 60%RH and the power
indicator will light. Under this condition, the humidity
can be set by pressing the Humidity Up/Down
buttons. When the indoor humidity is 5% higher than
the setting humidity, the compressor will be on.
When the indoor humidity is lower than the setting
humidity, the compressor will be off and the fan will
stop operating 3 minutes after the compressor is
shut down. If the indoor humidity is getting 5%
higher than the setting humidity, the fan will be on
immediately and the compressor will start too.
2.3 Continuous Dehumidifying mode
The compressor and the fan motor will always
be on and the Continue and power indicator will be
on. The LED will display the indoor humidity. Setting
humidity is not available.
2.4 Stop operation
When the unit is stopped operation by pressing
the ON/OFF button, the compressor and the fan will
shut down and all indicators will be off. The time for
defrost will be cleared. When the unit is restarted by
pressing the ON/OFF button, the unit will start with
previous set mode. Whether the defrost function
starts need to be prejudged. The self-diagnosis
function will just check the water-full defect. The fan
motor will work same as the compressor.
2.5 Compressor delay start
When the mode is changed but the compressor
does not start or the unit restart after stop working, if
the compressor accord with it’s starting condition,
the fan motor will start immediately while the
compressor will delay 3 seconds to re-start.
2.7 Protection and failure mode
2.7.1 Water full protection. When the water tank is
full , the compressor and fan motor will shut down
and the water full indicator will flash with LED
displaying P2. Under this situation, all button is out
of service. After the water is poured, the unit will
restore operating as previous setting.
2.7.2 Anti icing protection.
2.7.2.1 If the time accumulates up to 15 minutes
with compressor operating and the temperature of
evaporator lower than -1
o
C, the Anti-icing protection
function will be activated.
2.7.2.2 When the protection is activated, the
compressor will be off while the fan motor is on with
high speed, and the Turbo indicator will be on with
the LED displaying P1. The time will also be
cleared.
2.7.2.3 If the situation that compressor is off and fan
is on has lasted for 6 minutes or the ON/OFF button
is pressed, the unit will stop anti-icing protection
function.
2.7.2.4 After the Anti-icing function is completed, the
unit will restore operation as previous mode or stop
if the Anti-icing function is completed by pressed the
ON/OFF button.
2.7.3 Sensor failure check. When the output voltage
of sensor is lower than 0.5V or higher than 4.95V,
the unit will alarm and the LED displays E1 for
humidity sensor failure and E2 for temperature
sensor failure. Under this situation, the compressor
and the fan motor will shut down and the Power
indicator will flash at 5Hz. All buttons is out of
service. After the defect is cleared, the unit will not
work until the power to the unit is re-stored.
2.7.4 When the water full and sensor failure occur
together, the water full alarm has the priority on
display.
2.7.5 compressor protection: under all modes, the
compressor will delay 3 minutes to start after it stop.
