Protection Control For Heating Operation - Panasonic CS-XE15SKUA Service Manual

13.2.5 Dew Prevention Control 1

To prevent dew formation at indoor unit discharge area.

This control will be activated if:
Outdoor air temperature and Indoor pipe temperature judgment by microcontroller is fulfilled.
o
When Cooling or Dry mode is operated more than 20 minutes or more.
o

This control stopped if:
Compressor stopped.
o
Remote control setting changed (fan speed / temperature).
o
Outdoor air temperature and indoor intake temperature changed.
o

Fan speed will be adjusted accordingly in this control.
13.2.6 Odor Cut Control

To reduce the odor released from the unit.
Start Condition
o
 AUTO FAN Speed is selected during COOL or DRY operation.
 During freeze prevention control and timer preliminary operation, this control is not applicable.
Control content
o
Depends on compressor conditions:

1. Compressor OFF → Compressor ON.
The indoor unit fan stops temporarily and then starts to blow at minimum airflow for 30 seconds.
2. Compressor ON → Compressor OFF.
The indoor unit fan stops for 90 seconds and then blows at minimum airflow for 20 seconds.

13.3 Protection Control For Heating Operation

13.3.1 Intake Air Temperature Control
Compressor will operate at limited freq., if indoor intake air temperature is 86°F (30°C) or above.
13.3.2 Outdoor Air Temperature Control

The Max current value is regulated when the outdoor air temperature rise above 57.2°F (14°C) in order to avoid
compressor overloading.
13.3.3 Overload Protection Control

The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown
below.

If the heat exchanger temperature exceeds 140°F (60°C), compressor will stop.
13.3.4 Low Temperature Compressor Oil Return Control

In heating operation, if the outdoor temperature falls below 14°F (-10°C) when compressor starts, the
compressor frequency will be regulated up to 600 seconds.
Current Regulated
57.2°F (14°C)
Free Within Max Limit
Outdoor air temperature
OFF
140°F (60°C)
Frequency Reduce
131°F (55°C)
Frequency Limited
120.2°F (49°C)
Free
Indoor Heat
Exchanger Temp.
45
53.6°F (12°C)
125.6°F (52°C)
114.8°F (46°C)