14.1.5Compressor Overheating Prevention Control
Instructed frequency for compressor operation will be regulated by compressor discharge temperature. The changes of frequency are as below.
If compressor discharge temperature exceeds 224.6°F, compressor will be stopped, occurs 4 times per 20 minutes, timer LED will be blinking. (“F97” is indicated.)
14.1.6Low Pressure Prevention Control (Gas Leakage Detection)
Control start conditions
o For 5 minutes, the compressor continuously operates and outdoor total current is between 0.64A and 0.85A. o During Cooling and Soft Dry operations:
Indoor suction temperature - indoor piping temperature is below 39.2.°F. o During Heating operations:
Indoor piping temperature - indoor suction is under 41°F.
Control contents
o Compressor stops (and restart after 3 minutes).
o If the conditions above happen 2 times within 20 minutes, the unit will:
Stop operation
Timer LED blinks and “F91” indicated.
14.1.7Low Frequency Protection Control 1
When the compressor operates at frequency lower than 24Hz continued for 240 minutes, the operation frequency will be changed to 25Hz for 2 minutes.
14.1.8Low Frequency Protection Control 2
When all below conditions comply, minimum limit of compressor will be set.
Temperature, T, for: | Cooling / Soft Dry |
|
|
Indoor intake air (°F) | T < 57.2 or T ≥ 86 |
|
|
Outdoor air (°F) | T < 55.4 or T ≥ 100.4 |
|
|
Indoor heat exchanger (°F) | T < 86 |
|
|
Heating
-
T < 57.2 or T ≥ 82.4
T ≥ 32
14.2Protection Control For Cooling & Soft Dry Operation
14.2.1Outdoor Air Temperature Control
The maximum current value is regulated when the outdoor air temperature rise above 57.2°F in order to avoid compressor overloading.
38
