Haier HSU-09HS03/R2DB, HSU-12HS03/R2DB service manual Outdoor Unit Part

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

OUTDOOR UNIT PART

Chapter I: Indoor Unit and Main board for Outdoor Unit

Notice:

During operations under any mode, if short circuit, open circuit and other malfunctions of the temperature sensors are detected, the main engine should come to a halt immediately.

1. Outdoor-board:

1.1.Forced cooling operation switch:

Short circuit this switch before electrifying, data communication to indoor unit will be ignored:

Forced cooling will function, the 3-minute delay will be cancelled, and the following output will be ON simultaneously:

High wind volume (H) for outdoor fan motor; Compressor operates at the frequency of 80Hz.

1.2.Forced heating operation switch:

Short circuit this switch before electrifying, data communication to indoor unit will be ignored:

Forced heating will function, the 3-minute delay will be cancelled, and the following output will be ON simultaneously:

High wind volume (H) for outdoor fan motor; Compressor operates at the frequency of 80Hz. CPU checks all A/D ports

B．When safeguarding action happens outdoors, the actions in A should be OFF, and other inputs are independent of the actions in A.

C．LED output: Goes along even if safeguarding action happens outdoors; Cut this switch and go back to the original state. (The out-door safeguarding action will continue)

Chapter II: Basic Functions

3. Cooling mode

3.1.The four-way valve does not work (not electrified)

3.2.The discharge temperature sensor will not be tested within five minutes after the compressor is started

3.3.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. <21				, Low wind volume
					℃
		T	ambient		temp.	>21 ℃ , High 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.
3.4.Compressor control: Frequency range: 30HZ---------					120HZ		frequency is
	T ambient temp. <16			, the maximum
65HZ	16		℃			30	the maximum
		℃≤	T ambient temp.
					≤ ℃，
frequency is 90HZ	T ambient temp. 41				the maximum frequency is
30
	℃≤		≤	℃，
110HZ
	≥	℃，
T ambient temp.		41	the maximum frequency is 85HZ

Actual temperature and frequency maybe adjusted through EEPROM

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