Panasonic CS-PS12NKH, Service Manual, Page: 55 / 123

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12. Protection Control
12.1 Restart Control (Time Delay Safety Control)
š
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.
š
This control is not applicable if the power supply is cut off and on again.
š
This phenomenon is to balance the pressure inside the refrigerant cycle.
12.2 30 Seconds Forced Operation
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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.
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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
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When the outdoor unit total running current (AC) exceeds X value, the frequency instructed for compressor
operation will be decreased.
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If the running current does not exceed X value for 5 seconds, the frequency instructed will be increased.
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However, if total outdoor unit running current exceeds Y value, compressor will be stopped immediately for 3
minutes.
Model PS9*** PS12*** PS18*** PS24***
Operation Mode X (A) Y (A) X (A) Y (A) X (A) Y (A) X (A) Y (A)
Cooling / Soft Dry (A) 5.6 15.0 6.5 15.0 10.8 15.0 13.0 19.0
Cooling / Soft Dry (B) 5.2 15.0 6.2 15.0 10.3 15.0 12.5 19.0
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The first 30 minutes of cooling operation, (A) will be applied.
12.4 IPM (Power Transistor) Prevention Control
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DC Peak Current Control
o
When electric current to IPM exceeds set value of 13.2A (PS9,12NK), 17.1A (PS18NK), 27.7A (PS24NK)
within 30 seconds, the compressor will stop operation. Then, operation will restart after 1 minute.
o
For second occurrence onwards, if the set value exceeds again within 30 seconds, the compressor will stop
operation. Then, operation will restart after 2 minutes.
o
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).
š
Overheating prevention
o
When the IPM temperature raises to 120°C the compressor will stop immediately.
o
Compressor operation restarts after 3 minutes the temperature decreases to 115°C
o
If this condition repeats continuously 4 times within 20 minutes, timer LED will be blinking (“F96” is indicated).
(B)
(A)
Outdoor air temperature
38.5°C
37.5°C