Haier Arc Series User manual

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HSU-24C03/Z HSU-24H03/Z Introduction
1
Domestic Air Conditioner
1. Introduction
1.1 Safety Cautions
Be sure to read the following safety cautions before conducting repair work.
The caution items are classified into “Warning” and “Caution”. The “Warning” items are especially important
since they can lead to death or serious injury if they are not followed closely. The “Caution” items can also lead
to serious accidents under some conditions if they are not followed. Therefore, be sure to observe all the safety
caution items described below.
About the pictograms
This symbol indicates an item for which caution must be exercised.
The pictogram shows the item to which attention must be paid.
This symbol indicates a prohibited action.
The prohibited item or action is shown inside or near the symbol.
This symbol indicates an action that must be taken, or an instruction.
The instruction is shown inside or near the symbol.
After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates
normally, and explain the cautions for operating the product to the customer.
1.1.1 Caution in Repair
Warning
Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for
a repair.
Working on the equipment that is connected to a power supply can cause an electrical shook.
If it is necessary to supply power to the equipment to conduct the repair or inspecting the circuits, do not
touch any electrically charged sections of the equipment.
If the refrigerant gas discharges during the repair work, do not touch the discharging refrigerant gas.The
refrigerant gas can cause frostbite.
When disconnecting the suction or discharge pipe of the compressor at the welded section, release the
refrigerant gas completely at a well-ventilated place first.
If there is a gas remaining inside the compressor, the refrigerant gas or refrigerating machine oil
discharges when the pipe is disconnected, and it can cause injury.
If the refrigerant gas leaks during the repair work, ventilate the area. The refrigerant gas can generate
toxic gases when it contacts flames.
The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit.
Be sure to discharge the capacitor completely before conducting repair work.A charged capacitor can
cause an electrical shock.
Do not start or stop the air conditioner operation by plugging or unplugging the power cable plug.
Plugging or unplugging the power cable plug to operate the equipment can cause an electrical shock or
fire.

HSU-24C03/Z HSU-24H03/Z Introduction
2
Domestic Air Conditioner
Warning
Do not repair the electrical components with wet hands. Working on the equipment with wet hands can
cause an electrical shock.
Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical
shock.
Be sure to provide the grounding when repairing the equipment in a humid or wet place, to avoid electrical
shocks.
Be sure to turn off the power switch and unplug the power cable when cleaning the equipment. The
internal fan rotates at a high speed, and cause injury.
Do not tilt the unit when removing it. The water inside the unit can spill and wet the furniture and floor.
Be sure to check that the refrigerating cycle section has cooled down sufficiently before conducting repair
work. Working on the unit when the refrigerating cycle section is hot can cause burns.
Use the welder in a well-ventilated place. Using the welder in an enclosed room can cause oxygen
deficiency.
1.1.2 Cautions Regarding Products after Repair
Warning
Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to
conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools can
cause an electrical shock, excessive heat generation or fire.
When relocating the equipment, make sure that the new installation site has sufficient strength to
withstand the weight of the equipment.
If the installation site does not have sufficient strength and if the installation work is not conducted
securely, the equipment can fall and cause injury.
Be sure to install the product correctly by using the provided standard installation frame.
Incorrect use of the installation frame and improper installation can cause the equipment to fall, resulting
in injury.
For
integral
units only
Be sure to install the product securely in the installation frame mounted on a window frame.
If the unit is not securely mounted, it can fall and cause injury.
For
integral
units only

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4
Domestic Air Conditioner
1.1.3 Inspection after Repair
Warning
Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet
all the way.
If the plug has dust or loose connection, it can cause an electrical shock or fire.
If the power cable and lead wires have scratches or deteriorated, be sure to replace them.
Damaged cable and wires can cause an electrical shock, excessive heat generation or fire.
Warning
Do not use a joined power cable or extension cable, or share the same power outlet with other electrical
appliances, since it can cause an electrical shock, excessive heat generation or fire.
Caution
Check to see if the parts and wires are mounted and connected properly, and if the connections at the
soldered or crimped terminals are secure. Improper installation and connections can cause excessive
heat generation, fire or an electrical shock.
If the installation platform or frame has corroded, replace it. Corroded installation platform or frame can
cause the unit to fall, resulting in injury.
Check the grounding, and repair it if the equipment is not properly grounded. Improper grounding can
cause an electrical shock.
Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 M
ohm or higher.
Faulty insulation can cause an electrical shock.
Be sure to check the drainage of the indoor unit after the repair.
Faulty drainage can cause the water to enter the room and wet the furniture and floor.
HSU-24C03/Z HSU-24H03/Z Introduction

5
Domestic Air Conditioner
1.1.4 Using Icons
Icons are used to attract the attention of the reader to specific information. The meaning of each icon is described in
the table below:
1.1.5 Using Icons List
Icon Type of Information Description
Note: Note
A “note” provides information that is not indispensable, but may
nevertheless be valuable to the reader, such as tips and tricks.
Caution Caution
A “caution” is used when there is danger that the reader, through
incorrect manipulation, may damage equipment, loose data, get an
unexpected result or has to restart (part of) a procedure.
Warning Warning A “warning” is used when there is danger of personal injury.
Reference
A “reference” guides the reader to other places in this binder or in
this manual, where he/she will find additional information on a
specific topic.
HSU-24C03/Z HSU-24H03/Z Introduction

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4. Printed Circuit Board Connector Wiring Diagram
4.1 Indoor Unit
Connectors PCB1˄control PCB˅
1) CN1 connector for ION unit
2) CN2 connector for DC fan motor
3) CN4 connector for N in the terminal block
4) CN7 connector for louver motor
5) CN8 connector for ambient temp. sensor and piping temp.sensor
6) CN9 connector for PCB2
PCB2
CN101 connector for CN9 of PCB1
Other designations˖
1) SW1 in PCB1 is touch key.
PCB1
Sw1
CN9
CN8
CN6
CN4
CN2
CN7
CN3
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Note: Sequence of defrosting actions:
9minutes
Compressor ON
OFF
Four-way valve ON
OFF
Outdoor fan ON
OFF
55s 55s
1min 1min
5.1.7 Freezing prevention function
Under refrigerating and dehumidifying state, the air conditioner will control the outdoor fan as per
the temperature Tp of the indoor coil pipe according to the following conditions:
Compressor ,outdoor fan Zone of return deference
OFF after 5 minutes Fan,compressor ON
0 7 Tp(ć.)
5.1.8 3minutes stand-by time
When the compressor ceases due to the sensor OFF, unit On or OFF or fault, it will maintain
pause for 3 minutes.
5.1.9 Overload protection during heating running
Temperature protection of indoor coil pipe: Under heating state, the air conditioner will control the
running of the fan as per the temperature Tp of the indoor coil pipe and according to the following
conditions:
a.. 65ć=Tp, outdoor fan ceases; Tp=60
ć, outdoor fan resumes; the time from ceasing to
resuming is about 45 seconds;
b. 72ć=Tp, outdoor fan of compressor ceases after 5 seconds; Tp=64ć, compressor resumes
after 3 minutes.
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17
b.After setting the sleeping function, the heating mode will run as per the following rules:
1 hour 1 hour 3hours 3hours
T(ć)
Ts
Ts-2
Ts-3
Ts-4
t(hour)
Ts Sleep OFF
As shown in the above diagram, after running for 1 hour under refrigerating mode and
dehumidification mode, the setting temperature will increase 1ć; after another 1 hour, it will increase
1ćagain, and after 6 hours, it will cease; after running for 1 hour under heating mode, the setting
temperature will decrease 2
ć, after another 1 hour, it will decrease the 2ćagain, and after 3 hours,
it will increase 1ć, and after other 3 hours, it will cease.
5.1.15 Executive function after 2 seconds by remoter control:
After receiving remote control signal, the mainboard doesn’t enter the corresponding instruction task
until 2 seconds elapse.
5.1.16 Timer function:
You can set 24-hour timer on or timer off as required, and the minimum time unit is 1 minute. After
setting, a pattern of clock displayed on the LED, and it is off when timer setting is completed.
There are several timer mode as follows.
1) Timer on: The pattern of clock displayed on the LE D,the background light is off, and unit behaves
with halt status. Timer on is completed, and then unit starts running with the pattern of clock
disappeared,and the background light is on. The unit starts with the last setting receiving timer
signals, and sleep setting is not allowed.
2) Timer off: Unit working, the pattern of clock displayed on the LED; When reaching time setting,
unit enters shutdown mode, and sleep function can be set. If timer off and sleep are set
synchronously, the one which time is short run first. Executing shutdown instruction clear timer and
sleep function.
3) Timer on and timer off can be set synchronously.
5.1.17 Alarm from indoor fan motor:
120 seconds later after the indoor fan motor is charged, and the impulse from fan motor is not
detected , then stop outputting voltage to indoor fan motor, send alarm signals.
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