Protection Control; Protection Control For All Operations - Panasonic CS-TZ25ZKEW Service Manual

16. Protection Control

16.1 Protection Control for All Operations

16.1.1 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.
16.1.2 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 TZ20ZKE
Operation Mode X (A)
Cooling / Soft Dry (A) 3.81
Cooling / Soft Dry (B) 3.30
Heating 4.11
4 The first 30 minutes of cooling operation, (A) will be applied.
16.1.3 IPM (Power transistor) Prevention Control

Overheating Prevention Control
1 When the IPM temperature rises to 120°C, compressor operation will stop immediately.
2 Compressor operation restarts after 3 minutes the temperature decreases to 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, the compressor will stop operate.
2 If the set value is exceeded again more than 30 seconds after the compressor starts, the operation will
restart after 3 minutes.
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).
16.1.4 Compressor Overheating Prevention Control

Instructed frequency for compressor operation will be regulated by compressor temperature. The changes of
frequency are as below.

If compressor temperature exceeds 103°C, compressor will be stopped, occurs 4 times per 20 minutes, timer
LED will be blinking. ("F97" is indicated.)
TZ25ZKE/ TZ35ZKE/
RZ25ZKE RZ35ZKE
Y (A) X (A) Y (A) X (A)
4.77 6.23
15.03 4.33 15.03 5.72
4.69 5.57
39°C
Outdoor air temperature
TZ50ZKE/
TZ42ZKE
RZ50ZKE
Y (A) X (A) Y (A) X (A)
7.40 10.41
15.03 6.82 15.03 9.87
8.21 10.05
(B)
(A) 38°C
118
TZ60ZKE TZ71ZKE
Y (A) X (A) Y (A) X (A)
10.41 13.67
14.66 9.87 14.66 11.77
9.32 12.22
Y (A)
19.01