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15. Protection Control
15.1 Protection Control For All Operations
15.1.1 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.
15.1.2 Total Running Current
1 When the outdoor unit total running current (AC) exceeds X value, the frequency instructed for compressor
operation will be decreased.
2 If the running current does not exceed X value for 5 seconds, the frequency instructed will be increased.
3 However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for
3 minutes.
Model E7PKE E9PKE E12PKE E15PKE E18PKE E21PKE
Operation Mode X (A) Y (A) X (A) Y (A) X (A) Y (A) X (A) Y (A) X (A) Y (A) X (A) Y (A)
Cooling / Soft Dry (A) 3.69 15.06 4.54 14.98 6.57 14.91 7.96 14.91 11.81 14.75 12.27 14.75
Cooling / Soft Dry (B) 3.24 15.06 4.12 14.98 6.13 14.91 7.45 14.91 8.91 14.75 11.1 14.75
Heating 4.20 15.06 5.49 14.98 7.23 14.91 8.18 14.91 10.07 14.75 11.81 14.75
Model E24PKE E28PKE
Operation Mode X (A) Y (A) X (A) Y (A)
Cooling/Soft Dry (A) 14.39 19.05 14.82 19.05
Cooling/Soft Dry (B) 11.78 19.05 13.7 19.05
Heating 12.75 19.05 14.91 19.05
4 The first 30 minutes of cooling operation, (A) will be applied.
E7/9/12/15/21/24PK
E28PK
15.1.3 IPM (Power transistor) Prevention Control
• Overheating Prevention Control
1 When the IPM temperature rises to 110°C (E28PK) and 120°C (E7/9/12/15/24/24PK), compressor operation
will stop immediately.
2 Compressor operation restarts after 3 minutes the temperature decreases to 95°C (E28PK) 110°C.
3 If this condition repeats continuously 4 times within 20 minutes, timer LED will be blinking (“F96” is indicated).
• DC Peak Current Control
1 When electric current to IPM exceeds set value of 16.0 ± 2.0A (E7/9/12/15PK) and 30.0 ± 3.0A
(E18/21/24/28PK), the compressor will stop operate. Then, operation will restart after 3 minutes.
2 If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will
restart after 1 minute.
3 If the set value exceeded 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, timer
LED will be blinking (“F99” is indicated).
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