Panasonic (WH-UD12CE5-A-1, Руководство по обслуживанию

Страница: 85 / 158

85
14.1.7 Low Frequency Protection Control 2
š
When all the below conditions comply, the compressor frequency will change to lower frequency.
Temperature, T, for: Heating
Outlet water (°C) T < 14 or T ≥ 48
Outdoor air (°C) T < 4 or T ≥ 24
Indoor heat exchanger (°C) T ≥ 0
14.1.8 High pressure sensor control
š
Purpose:
o
To protect the system operation.
š
Detection period:
o
After compressor on for 5 minutes.
š
Detection conditions:
o
When abnormal high voltage detection, 5V or when open circuit detection 0V for 5 seconds continuously.
š
After detection:
o
When abnormality is detected continue 5 seconds, unit stop operation.
o
OFF/ON control panel LED will blink (H64 error occurs).
14.1.9 Outside Temperature Current Control
14.1.10 Crank case heater control
š
Purpose:
- For compressor protection during low outdoor ambient operation (during heating low temperature operation).
š
Control content:
a. Trigger heater START condition
o
when the outdoor air temperature is 4°C or below, and discharge temperature is 12°C or below.
b. Resetting heater STOP condition
1.
when the outdoor air temperature exceeds entry condition (6°C).
2.
when the discharge temperature exceeds entry condition (19°C).
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.