Protection Control; Restart Control (Time Delay Safety Control); Seconds Forced Operation; Total Running Current Control - Panasonic CS-S9TKV Service Manual

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 10 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
Operation Mode X (A)
Cooling / Soft Dry (A) 5.5
Cooling / Soft Dry (B) 5.0

The first 30 minutes of cooling operation, (A) will be applied.

13.4 IPM (Power Transistor) Prevention Control


DC Peak Current Control
When electric current to IPM exceeds set value of 13.2 A (S9TK), 13.1 A (S12TK), 17.1 A (S18TK),
o
27.7 A (S24TK) ), 18.5 A (S28TK) within 30 seconds, the compressor will stop operation. Then, operation will
restart after 1 minute.
For second occurrence onwards, if the set value exceeds again within 30 seconds, the compressor will stop
o
operation. Then, operation will restart after 3 minutes.
If this condition repeats continuously for 7 times, all indoor and outdoor relays will be cut off, timer LED will
o
be blinking ("F99" is indicated).

Overheating prevention
When the IPM temperature rises to 120°C the compressor will stop immediately.
o
Compressor operation restarts after 3 minutes the temperature decreases to 110°C.
o
If this condition repeats continuously 4 times within 20 minutes, timer LED will be blinking ("F96" is indicated).
o
S9TKV S12TKV
Y (A) X (A)
15.0 7.0
15.0 6.4
39°C
Outdoor air temperature
S18TKV
Y (A) X (A) Y (A)
15.0 10.4 15.0
15.0 9.9 15.0
(B)
38°C
(A)
86
S24TKV S28TKV
X (A) Y (A) X (A)
12.0 19.0 13.3
11.2 19.0 12.3
Y (A)
19.0
19.0