Haier HSU-12HS03/R2DB, HSU-09HS03/R2DB service manual Domestic Air Conditioner

outdoor coil＜52℃, the

outdoor coil＜52℃, the

Domestic Air Conditioner	HSU-12HS03/R2(DB)
	Model: HSU-09HS03/R2(DB)

and the outdoor fan motor returns to its original state;

The above temperature points, frequency-decreasing step and time interval can all be adjusted through EEPROM

III.Anti over-loading operation while heating:

5.3.When the operation frequency F＜40HZ, if the temperature of the outdoor

coiled pipe T outdoor coil≥52℃, the outdoor fan motor performs forced high-speed operation and the operation frequency of the compressor should be decreased by 2Hz， then examine the temperature of the outdoor coiled pipe at 10-second intervals, if T outdoor coil≥52℃, decrease the operation frequency further by 2Hz， until the frequency is the lowest;

During the frequency-decreasing operation, if 47℃≤T compressor and the fan motor keep their original states;

When T outdoor coil≤46℃, the compressor runs at the normal operating frequency, and the outdoor fan motor returns to its original state;

5.4.When the operation frequency F≥40HZ, if the temperature of the outdoor coiled pipe T outdoor coil≥57℃, the outdoor fan motor performs forced high-speed operation and the operation frequency of the compressor should be decreased by 2Hz， then examine the temperature of the outdoor coiled pipe at 10-second intervals, if T outdoor coil≥57℃, decrease the operation frequency further by 2Hz， until the frequency is the lowest;

During the frequency-decreasing operation, if 52℃≤T compressor and the fan motor keep their original states

When T outdoor coil≤51℃, the compressor runs at the normal operating frequency, and the outdoor fan motor returns to its original state;

The above temperature points, frequency-decreasing step and time interval can all be adjusted through EEPROM

6.. Compressor discharge safeguard:

5 minutes after the compressor starts, when the compressor temperature rises above 105℃, decrease the compressor frequency by 2HZ/stop for 10 seconds, until the compressor temperature falls below 90℃, the compressor returns to normal operation;

When the compressor temperature rises above 115℃, the compressor should stop at once, wait until the compressor temperature falls below 90℃ and the waiting time period exceeds 3 minutes, the compressor returns to normal operation;

After the compressor restarts, if the compressor temperature rises above 115℃ once more within 15 minutes, the compressor should stop at once and give an alarm.

The temperature points are stored in EEPROM

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