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12. Protection Control
12.1 Restart Control (Time Delay Safety Control)
• The compressor will not turn on within 3 minutes from the moment operation stops, although the unit is turned on
again by pressing OFF/ON button at remote control within this period.
• This control is not applicable if the power supply is cut off and on again.
• This phenomenon is to balance the pressure inside the refrigerant cycle.
12.2 30 Seconds Forced Operation
• Once the air conditioner is turned on, the compressor will not stop within 30 seconds in a normal operation
although the intake air temperature has reached the thermo-off temperature. However, force stop by pressing the
OFF/ON button at the remote control is permitted or the Auto OFF/ON button at indoor unit.
• The reason for the compressor to force operation for minimum 30 seconds is to allow the refrigerant oil run in a
full cycle and return back to the outdoor unit.
12.3 Total Running Current Control
• When the outdoor unit total running current (AC) exceeds X value, the frequency instructed for compressor
operation will be decreased.
• If the running current does not exceed X value for 5 seconds, the frequency instructed will be increased.
• However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for 3
minutes.
Model S18*** S24***
Operation Mode X (A) Y (A) X (A) Y (A)
Cooling / Soft Dry (A) 9.2 15.0 11.1 19.0
Cooling / Soft Dry (B) 8.1 15.0 10.3 19.0
• The first 30 minutes of cooling operation, (A) will be applied.
12.4 IPM (Power Transistor) Prevention Control
• Overheating Prevention Control
o When the IPM temperature rises to 100°C, compressor operation will stop immediately.
o Compressor operation restarts after 3 minutes the temperature decreases to 95°C.
• DC Peak Current Control
o When electric current to IPM exceeds set value of 18.5A, the compressor will stop operate.
During operation starts, if the DC peak current is detected after 30 seconds, the operation will restart
after 2 minutes.
During operation starts, if the DC peak current is detected within 30 seconds, the operation will restart
after 1 minute.
o After compressor starts for 30 seconds, if DC peak current is detected exceeding 18.5A and this condition
repeats continuously for 7 times, all indoor and outdoor relays will be cut off. Timer LED blinks and “F99”
indicated.
(B)
(A)
Outdoor air temperature
38.5°C
37.5°C
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