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13. Protection Control
13.1 Protection Control For All Operations
13.1.1 Time Delay Safety Control
o The compressor will not start for three minutes after stop of operation.
o This control is not applicable if the power supply is cut off and on again or after 4-way valve deices condition.
13.1.2 Total Running Current Control
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 five seconds, the frequency instructed will be increased.
3 However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for
three minutes.
RE18NK RE24NK
Operation Mode
X (A) Y (A) X (A) Y (A)
Cooling / Soft Dry (A) 11.81 14.75 15.03 19.02
Cooling / Soft Dry (B) 8.91 14.75 13.63 19.02
Cooling / Soft Dry (C) - - 15.03 19.02
Heating 10.07 14.75 13.35 19.02
4 The first 30 minutes of cooling operation, (A) will be applied.
13.1.3 IPM (Power transistor) Prevention Control
Overheating Prevention Control
o When the IPM temperature rises to 120°C (RE18NK) and 110°C (RE24NK), compressor operation will stop
immediately.
o Compressor operation restarts after three minutes the temperature decreases to 110°C (RE18NK) and 95°C
(RE24NK).
o If this condition repeats continuously 4 times within 20 minutes, timer LED will be blinking (“F96” is indicated).
DC Peak Current Control
o When electric current to IPM exceeds set value of 30.0 ± 5.0 A, the compressor will stop operate. Then,
operation will restart after three minutes.
o If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will
restart after one minute.
o If the set value is exceeded again within 30 seconds after the compressor starts, the operation will restart
after one minute. If this condition repeats continuously for seven times, all indoor and outdoor relays will be
cut off, timer LED will be blinking (“F99” is indicated).
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