Panasonic WH-SHF09D3E5, Service Manual

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13.1.6 Low Pressure Protection Control
š
Purpose:
o
To protect the system operation.
o
Detection period:
ƒ After compressor on for 5 minutes.
o
Detection conditions:
ƒ When detection of Tem above 30°C.
ƒ Calculation of average evaporation temperature (Tem).
ƒ
Use outdoor low pressure sensor.
ƒ Tem use the value calculated for discharge temperature setting value
o
After detection:
ƒ Compressor stops restart again after 3 mins.
ƒ When abnormalities continuously generated 60 times within 480 minutes
ƒ Protection is prohibited.
ƒ Error H42 will be displayed.
13.1.7 High Pressure Sensor Control / Low Pressure Sensor
š
Purpose:
- To protect the system operation.
š
Detection period:
- After compressor on for 1 minute.
š
Detection conditions:
- When abnormal high voltage detection, 5V or when open circuit detection 0V for 5 seconds continuously.
š
After detection:
- When abnormality is detected continue 5 seconds, unit stop operation.
- OFF/ON control panel LED will blink (H64 error occurs).
13.1.8 Outside Temperature Current Control
13.1.9 Extreme Low Temperature Control
š
Purpose:
- To improve the compressor reliability during cold start and after deice when running in extreme low outdoor
temperature -20°C.
Starting condition:
1 Heating operation
2 Outdoor air temperature < -10°C
3 Actual
frequency ≥ 50Hz
4 Compressor discharge temperature < 20°C
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.
- Cancel the extreme low temperature control when compressor discharge sensor
≥ 60°C