Haier HSU-12HS03/R2DB, HSU-09HS03/R2DB ． Conditions to enter into the defrosting stage

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

4.Heating mode

4.1.The four-way valve is electrified 2 seconds after the compressor is electrified

4.2.Malfunctions of the discharge temperature sensor will not be tested within five minutes after the compressor is started

4.3.Outdoor fan motor control: The fan motor starts five seconds after the compressor starts, switching conditions for the two gears of wind volume are

as follows:	T ambient temp.	<16 ℃ ,	High	wind
volume	T ambient	temp. ≥ 16 ℃ , Low
wind volume	When the		fan	motor

starts up, and the ambient temperature is at the return difference (±2℃), it runs at the low wind volume.

4.4.Compressor control: Frequency range: 30HZ---------120HZ

T ambient temp. >22℃, the maximum frequency is 70HZ

9℃≤T ambient temp.≤22℃，the maximum frequency is 90HZ 2 ℃ ≤ T ambient temp.≤9℃，the maximum frequency is

100HZ

T ambient temp. <2℃，the maximum frequency is 110HZ

Actual temperature and frequency can be adjusted through EEPROM 4.5.Conditions to enter into the defrosting stage:

A． Conditions to enter into the defrosting stage

After the heating operation has begun, and the operation time of the compressor adds up to 45 minutes (The total operation time of the compressor will be reset to zero after defrosting or the operating mode switched into cooling), through examining the defrosting sensor TE (Examining the frosting status of the outdoor heat exchanger) and the ambient temperature sensor TA, if the following conditions are met continuously up to 5 minutes, then defrosting operation is entered:

TE≤C×TA－α

Of which：C：TA＜0℃，C=0.8 TA≥0℃，C=0.3

αmaybe adjusted through EEPROM

For places easy to frost, set α as H; For places not easy to frost, set α as L; It is set as M when leaving factory.

Temperature limit to enter into the defrosting stage -15℃E≤C×TA－α≤2℃E

B．Time interval of defrosting

•While the calculated data of C×TA－α fall within the range of -15℃E≤C ×TA－α, the time interval between two defrosting operation is 45 minutes

•While the calculated data of C×TA－α fall within the range of C×TA－α ≤-15℃E, the time interval between two defrosting operation is 55 minutes

C．Defrosting operation

•When defrosting begins, the compressor and the outdoor fan motor stops, and the four-way valve turns OFF 50 seconds later.

•The compressor starts and stays at the frequency of 60HZ for 30 seconds, then operates towards the target frequency (Can be adjusted through

EEPROM)

•The current safeguard and the compressor discharge safeguard and other means of safeguard remain valid while defrosting. If the compressor

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