Panasonic S-45PU1E5 Technical Data & Service Manual page 580

6) Cooling Freeze Prevention Control
The following control is performed during cooling operations (including dry mode operation), in accordance
with whichever of the indoor heat exchanger temperatures (E1 or E2) is lower. (See the chart below.)
(a) Frequency will not be decreased less than 6 minutes after thermostat ON.
(b) The threshold value is increased in accordance with the indoor load (differences of temperature).
min. (E1, E2)
Frequency increased
5+β
Frequency increases prevented
2+α
Frequency decreased
7) Discharge Temperature Control
4
The following control is performed to prevent the discharge temperature from rising abnormally in order to protect
the inverter compressor.
In accordance with the temperature of the discharge sensor TD, such controls are performed as to limiting the
increase of inverter frequency, decreasing it or halting operation of the compressor.
TD (Discharge Temperature)
°C
Outdoor unit operations halted
106
Frequency decreased
103
Frequency increases prevented
101
Frequency increased slower than normal
97
Normal operations (no control)
* If the discharge temperature exceeds 106°C, operations of the compressor are halted and restarted after 3
minutes.
If this start/stop activity is repeated 5 times, the alarm "P03" (abnormal discharge temperature) occurs.
Outdoor EEPROM : Amendment of α and β values
EEPROM setting in outdoor unit
CODE: 3F (for α setting)
Setting No. -15
α
-15
CODE: 40 (for β setting)
Setting No. -15
β
-15
*
Setting at factory shipment
4-20
can be made due to 3F or 40.
*
0
0
*
0
0
9
9
9
9