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(8) Compressor overheat protection
(a) Purpose:
It is designed to prevent deterioration of oil, burnout of motor coil and other trouble resulting from the
compressor overheat.
(b) Detail of operation
1)
Speeds are controlled with temperature detected by the sensor mounted on the discharge pipe.
Discharge pipe temperature (˚C)
Lower limit
()
After lapse of min. or over
()
After lapse of min. or over
()
After lapse of min. or over
()
rps
rps
()
0 rps
(Example) Fuzzy
90 (95)
100 (105)
110 (115)
Notes () When the discharge pipe temperature is in the range of 00~0ºC (model 0, 0 : 0~ºC), the speed is reduced by rps.
() When the discharge pipe temperature is raised and continues operation for 0 seconds without changing, then the speed is reduced again by rps.
() If the discharge pipe temperature is in the range of 0~00ºC (model 0, 0 : ~0ºC) even when the compressor command speed is maintained
for minutes when the temperature is in the range of 0~00ºC (model 0, 0 : ~0ºC), the speed is raised by rps and kept at that speed for
minutes. This process is repeated until the command speed is reached.
(4) Lower limit speed
2)
If the temperature of 0ºC (model 0, 0 : ºC) is detected by the sensor on the discharge pipe, then the compressor
will stop immediately.
When the discharge pipe temperature drops and the time delay of minutes is over, the unit starts again within hour
but there is no start at the third time.
(9) Current safe
(a) Purpose:
Current is controlled not to exceed the upper limit of the setting operation current.
(b) Detail of operation:
Input current to the converter is monitored with the current sensor fixed on the printed circuit board
of the outdoor unit and, if the operation current value reaches the limiting current value, the compressor
command speed is reduced.
If the mechanism is actuated when the compressor command speed is less than 0 rps, the compressor
is stopped immediately. Operation starts again after a delay time of minutes.
(10) Current cut
(a) Purpose:
Inverter is protected from overcurrent.
(b) Detail of operation:
Output current from the inverter is monitored with a shunt resistor and, if the current exceeds the
setting value, the compressor is stopped immediately. Operation starts again after a delay time of
minutes.
(11) Outdoor unit failure
This is a function for determining when there is trouble with the outdoor unit during air conditioning.
The compressor is stopped if any one of the following in item (a), (b) is satisfied. Once the unit is stopped by this function, it is not
restarted.
(a) When the input current is measured at A or less for continuous minutes or more.
(b) If the outdoor unit sends a 0 rps signal to the indoor unit times or more within 0 minutes of the power being turned on.
(12) Indoor fan motor protection
When the air conditioner is operating and the indoor fan motor is turned ON, if the indoor fan motor has operated at 00 rpm or
under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system.
• Figures in ( ) are for
model 50, 60.
Cooling
Heating
Lower Limit Speed
0~
0 rps
0 rps
0, 0
rps
rps
Item
Model
