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13. Protection Control
13.1 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.
13.2 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.
13.3 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 S9*** S12*** S18*** S24*** S28***
Operation Mode X (A) Y (A) X (A) Y (A) X (A) Y (A) X (A) Y (A) X (A) Y (A)
Cooling / Soft Dry (A) 5.5 15.0 6.8 15.0 9.3 14.8 12.0 19.0 13.3 19.3
Cooling / Soft Dry (B) 5.0 15.0 6.3 15.0 8.8 14.8 11.5 19.0 12.3 19.3
• The first 30 minutes of cooling operation, (A) will be applied.
13.4 IPM (Power Transistor) Prevention Control
13.4.1 S9MK, S12MK
• 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. Then, operation
will restart after 3 minutes.
o If the set value exceeds again more than 30 seconds after the compressor starts, the operation will restart
after 2 minutes.
o If the set value exceeds again within 30 seconds after the compressor starts, the operation will restart after 1
minute. If this condition repeats continuously for 7 times, all indoor and outdoor relays will be cut off.
(B)
(A)
Outdoor air temperature
38.5°C
37.5°C
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