Protection Control For Heating Operation - Panasonic WH-SDF09C3E5 Service Manual

14.1.7 Low Frequency Protection Control 2
When all the below conditions comply, the compressor frequency will change to lower frequency.
14.1.8 High pressure sensor control
Purpose:
To protect the system operation.
o
Detection period:
After compressor on for 5 minutes.
o
Detection conditions:
When abnormal high voltage detection, 5V or when open circuit detection 0V for 5 seconds continuously.
o
After detection:
When abnormality is detected continue 5 seconds, unit stop operation.
o
OFF/ON control panel LED will blink (H64 error occurs).
o
14.1.9 Outside Temperature Current Control
14.1.10 Crank case heater control
Purpose:
- For compressor protection during low outdoor ambient operation (during heating low temperature operation).
Control content:
a. Trigger heater START condition
when the outdoor air temperature is 4°C or below, and discharge temperature is 12°C or below.
o
b. Resetting heater STOP condition
when the outdoor air temperature exceeds entry condition (6°C).
1.
when the discharge temperature exceeds entry condition (19°C).
2.
14.2

Protection Control for Heating Operation

14.2.1 Outdoor Air Temperature Control
The maximum current value is regulated when the outdoor air temperature rises above 14°C in order to avoid
compressor overloading.
Temperature, T, for:
Outlet water (°C)
Outdoor air (°C)
Indoor heat exchanger (°C)
85
Heating
T < 14 or T ≥ 48
T < 4 or T ≥ 24
T ≥ 0