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

outdoor coil＜57℃, the

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

halts during the defrosting stage, remain still for 30 seconds, then conducts defrosting operation if it is still within the defrosting stage, the compressor starts according to the demand of the startup of the defrosting compressor.

•Entering into the defrosting stage, it must be guaranteed that the minimum operation time of the compressor should amount at least to 2 minutes before exit defrosting.

D.Conditions to exit the defrosting stage

The defrosting operation will return to heating operation if any of the following conditions is met.

（1）：The temperature of the outdoor heat exchanger remains above 7 ℃ (Can be adjusted through EEPROM) for over 80 seconds continuously.

（2）：Keep defrosting operation for 9 minutes (Can be adjusted through EEPROM) continuously.

E． After the condition to exit defrosting operation is met, work as

follows.

The compressor stops, the outdoor fan motor stops 50 seconds later, the four-way valve turns on, the compressor starts according to the starting process.

Time sequence of the defrosting operation is as follows: Compressor

Outdoors fan motor

Four-way valve

60×9Max

5.Outdoor condensation temperature control while cooling:

5.1.When the operation frequency F＜ 40HZ, if the temperature of the outdoor coiled pipe T outdoor coil≥52℃, decrease the operation frequency of the compressor 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 outdoor coil ＜ 52 ℃ , the compressor and the fan motor keep their original states;

the compressor runs at the normal operating frequency, and the outdoor fan motor returns to its original state,

5.2.When the operation frequency F≥40HZ, if the temperature of the outdoor coiled pipe T outdoor coil≥57℃, decrease the operation frequency of the compressor 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,

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