Low Pressure Protection Control - Panasonic WH-MDF12C6E5 Service Manual

13.1.6 Low Pressure Protection Control

Purpose:
To protect the system operation.
o
Detection period:
After compressor on for 5 minutes.
o
Detection conditions:
When detection of Tem above 30°C.
o
Calculation of average evaporation temperature (Tem).
o
Use outdoor low pressure sensor.
o
Tem use the value calculated for discharge temperature setting value.
o
After detection:
Compressor stops restart again after 3 mins.
o
When abnormalities continuously generated 60 times within 480 minutes.
o
Protection is prohibited.
o
Error H42 will be displayed.
o
13.1.7 High Pressure Sensor Control
Purpose:
To protect the system operation.
o
Detection period:
After compressor on for 1 minute.
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 remote control LED will blink (H64 error occurs).
o
13.1.8 Outside Temperature Current Control
13.1.9 Extreme Low Temperature Control
Purpose:
- To improve the compressor reliability during cold start and after deice when running in extreme low outdoor
temperature -20°C.
Starting condition:
Heating operation
o
Outdoor air temperature < -10°C
o
Actual frequency ≥ 50Hz
o
Compressor discharge temperature < 20°C
o
When the above condition is fulfilled, this control is activated.
5Hz up every 30 sec. until it reaches the target frequency.
Cancellation condition:
starting condition not fulfill.
o
Cancel the extreme low temperature control when compressor discharge sensor ≥ 60°C
o
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