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2)
If the temperature of 110ºC (model 50 : 115ºC) 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 3 minutes is over, the unit starts again within 1 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 30 rps, the compressor
is stopped immediately. Operation starts again after a delay time of 3 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
3 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 1 A or less for 3 continuous minutes or more.
(b) If the outdoor unit sends a 0 rps signal to the indoor unit 3 times or more within 20 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 150 rpm or
under for more than 30 seconds, the unit enters first in the stop mode and then stops the entire system.
(13) Serial signal transmission error protection
(a) Purpose:
Prevents malfunction resulting from error on the indoor
↔
outdoor signals.
(b) Detail of operation:
If the compressor is operating and a serial signal cannot be received from the indoor control with out-
door control having serial signals continues for 7 minute and 35 seconds, the compressor is stopped.
After the compressor has been stopped, it will be restarted after the compressor start delay if a serial
signal can be received again from the indoor control.
(14) Rotor lock
If the motor for the compressor does not turn after it has been started, it is determined that a compressor lock has occurred and
the compressor is stopped.
(15) Outdoor fan motor protection
If the outdoor fan motor has operated at 75 rpm or under for more than 30 seconds, the compressor and fan motor are stopped.
