Haier HSU-07C03 User manual

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HSU-07C03

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HSU-07C03 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-07C03 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

HSU-07C03 Introduction
3
Domestic Air Conditioner
Warning
Be sure to use an exclusive power circuit for the equipment, and follow the technical standards related to
the electrical equipment, the internal wiring regulations and the instruction manual for installation when
conducting electrical work.
Insufficient power circuit capacity and improper electrical work can cause an electrical shock or fire.
Be sure to use the specified cable to connect between the indoor and outdoor units. Make the
connections securely and route the cable properly so that there is no force pulling the cable at the
connection terminals.
Improper connections can cause excessive heat generation or fire.
When connecting the cable between the indoor and outdoor units, make sure that the terminal cover does
not lift off or dismount because of the cable.
If the cover is not mounted properly, the terminal connection section can cause an electrical shock,
excessive heat generation or fire.
Do not damage or modify the power cable.
Damaged or modified power cable can cause an electrical shock or fire. Placing heavy items on the
power cable, and heating or pulling the power cable can damage the cable.
Do not mix air or gas other than the specified refrigerant (R-410A / R22) in the refrigerant system.
If air enters the refrigerating system, an excessively high pressure results, causing equipment damage
and injury.
If the refrigerant gas leaks, be sure to locate the leak and repair it before charging the refrigerant. After
charging refrigerant, make sure that there is no refrigerant leak.
If the leak cannot be located and the repair work must be stopped, be sure to perform pump-down and
close the service valve, to prevent the refrigerant gas from leaking into the room. The refrigerant gas itself
is harmless, but it can generate toxic gases when it contacts flames, such as fan and other heaters,
stoves and ranges.
When replacing the coin battery in the remote controller, be sure to disposed of the old battery to prevent
children from swallowing it.
If a child swallows the coin battery, see a doctor immediately.
Caution
Installation of a leakage breaker is necessary in some cases depending on the conditions of the
installation site, to prevent electrical shocks.
Do not install the equipment in a place where there is a possibility of combustible gas leaks.
If a combustible gas leaks and remains around the unit, it can cause a fire.
Be sure to install the packing and seal on the installation frame properly. If the packing and seal are not
installed properly, water can enter the room and wet the furniture and floor.
For
integral
units only

HSU-07C03 Introduction
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-07C03 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.

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9
1.1 Indoor unit
Connectors PCB
1) CN1 connector for transformer˄primary coil˅
2) CN2 connector for terminal block
3) CN3 connector for ransformer˄secondary coil˅
4) CN5 connector for louver motor
5) CN6 connector for ambient temp. sensor and piping temp.sensor
6) CN7 connector for receiver dislay
7) CN8 connector for indoor AC fan motor
8) CN9 connector for indoor AC fan motor

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10
Otherdesignations˖CN7 CN5
CN9 CN8 CN6
CN3
CN1 CN2

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Including brief introduction to air conditioners of series models and electric control function.
5-1 Brief introduction to electric control function
5-1-1 Automatic running
When the running mode is turned to automation after starting the system, the system will
first determine the running mode according to the current room temperature and then will run
according to the determined mode. Tr in the following selection conditions means room
temperature, Ts means setting temperature, Tp means temperature of indoor coil pipe
Trı26ćrunning refrigerating mode Ts=26ć
Tr<26ćrunning fan mode
After turning to the automation mode, the running mode can be switched between
refrigerating mode, fan mode and heating mode according to the change of the indoor ambient
temperature.
5-1-2 cool running
when Tr tTs, outlet air from compressor is on and indoor fan motor run at fixed wind speed.
When Tr Ts, outlet air from compressor is off ,
and when Tr > Ts, outdoor fan motor and compressor are on.
5-1-3 Dehumidification running
The compressor, outdoor fan and indoor fan will run as per the following working pattern so as to
realize the refrigerating running of dehumidification:
ķTr> Ts+2ć, compressor, outdoor fan run continuously, indoor fan runs as per setting wind speed
(State 1);
ĸTs+ 2ćıTrıTs, compressor, outdoor fan run intermittently with 10 minutes ON, 6 minutes
OFF. (Compressor and outdoor fan are synchronous) indoor fan runs in fixed lower wind speed, and
will cease at the stand-by time of 3 minutes (State 2)
ĹTr <Ts, compressor, outdoor fan ceases, indoor fan runs in lower wind speed. (State 3)
State1
State2
State3
Ts-1 Ts Ts+2 Ts+3

2
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5-1-4 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:
Zoneofreturndeference
Compressor,outdoor fan OFF after 5 minutes Fan,compressor ON
0 7 Tp(ć.)
5-1-5 3 minutes 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.
5-1-6 Compensatory function of power failure
If the unit is suddenly off during running due to power failure, or closed for maintenance or
troubleshooting, it will restart to run after the power resumes with the original condition before the
unit is off
Note: 1. Function setting: Pressing the SLEEP button on the remote control unit for 10 times until
hearing 4 sounds from the buzzer on the panel.
2. Memory content: Running mode, setting wind speed, setting temperature, sleep state, flap
state.
3. Cancellation of function: Pressing the SLEEP button on the remote control unit for 10
times until hearing 2 sounds from the buzzer on the panel.
5-1-7 Trial run function
When the air conditioner is in OFF state, press the emergency switch for 5 seconds till hearing 2
sounds of click from the buzzer, then the air conditioner will turn to the trial run state. The unit will
run in the refrigerating mode and the indoor fan will run in high wind speed mode.
5-1-8 Emergency running mode
When the air conditioner is in stand-by state, press the emergency switch till hearing a sound
from the buzzer, then the air conditioner will turn to the emergency run state. The rules of
emergency run are as follows:
Trı26ć, running refrigerating mode, Ts = 26ć;
Tr<26ć, running fan mode,

3
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5-1-9 Sleeping function
After setting the sleeping function, the refrigerating mode and dehumidification mode will run as
per the following rules:
1 hour 1 hour 6hours
T(ć)
Ts+2
Ts+1
Ts Sleep OFF t(hour)
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.

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5-2 Function of Main Thermistor
Note: A: Indoor heat-exchange sensor
Indoor heat-exchange sensor
The indoor heat exchanger thermistor is used for anti-icing control .During the cooling
operation, if the heat exchanger temperature in the room where operation is halted
becomes 0°C, it is assumed as icing.

15
Domestic Air Conditioner
5.3 Value of Thermistor
Indoor unit
Room sensor
R25 =23Kȍ±3.5%ć
B25 /50 =4200K±3%ćć
Temp.(ć)Max.(Kȍ) Normal(Kȍ) Min.(Kȍ)Tolerance(ć)
-30 568.8372 501.0746 440.8435 -1.97 1.75
-29 530.9600 468.6491 413.1441 -1.95 1.74
-28 495.8488 438.5314 387.3645 -1.93 1.72
-27 463.2850 410.5433 363.3602 -1.91 1.71
-26 433.0683 384.5212 340.9980 -1.90 1.70
-25 405.0156 360.3153 320.1558 -1.88 1.69
-24 378.9588 337.7879 300.7211 -1.86 1.67
-23 354.7440 316.8126 282.5905 -1.84 1.66
-22 332.2300 297.2732 265.6686 -1.82 1.64
-21 311.2873 279.0627 249.8676 -1.80 1.63
-20 291.7969 262.0831 235.1067 -1.78 1.62
-19 273.6494 246.2437 221.3111 -1.76 1.60
-18 256.7445 231.4612 208.4122 -1.74 1.59
-17 240.9897 217.6590 196.3462 -1.72 1.57
-16 226.3000 204.7662 185.0545 -1.70 1.56
-15 212.5973 192.7176 174.4829 -1.68 1.54
-14 199.8093 181.4531 164.5813 -1.66 1.53
-13 187.8698 170.9169 155.3033 -1.64 1.51
-12 176.7176 161.0578 146.6059 -1.62 1.49
-11 166.2961 151.8284 138.4495 -1.60 1.48
-10 156.5532 143.1847 130.7973 -1.58 1.46
-9 147.4409 135.0863 123.6153 -1.56 1.44
-8 138.9148 127.4956 116.8717 -1.53 1.43
-7 130.9337 120.3778 110.5374 -1.51 1.41
-6 123.4597 113.7009 104.5852 -1.49 1.39
-5 116.4577 107.4349 98.9897 -1.47 1.38
-4 109.8953 101.5523 93.7278 -1.45 1.36
-3 103.7422 96.0274 88.7774 -1.43 1.34
-2 97.9708 90.8365 84.1185 -1.40 1.32
-1 92.5551 85.9574 79.7322 -1.38 1.30
0 87.4712 81.3697 75.6011 -1.36 1.29
1 82.6970 77.0544 71.7088 -1.34 1.27
2 78.2118 72.9937 68.0402 -1.31 1.25
3 73.9966 69.1712 64.5813 -1.29 1.23
4 70.0335 65.5716 61.3188 -1.27 1.21
5 66.3062 62.1807 58.2405 -1.24 1.19
6 62.7992 58.9853 55.3351 -1.22 1.17
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16
Domestic Air Conditioner
7 59.4984 55.9729 52.5917 -1.20 1.15
8 56.3905 53.1320 50.0006 -1.17 1.13
9 53.4631 50.4521 47.5523 -1.15 1.11
10 50.7048 47.9230 45.2384 -1.13 1.09
11 48.1049 45.5355 43.0505 -1.10 1.07
12 45.6534 43.2808 40.9813 -1.08 1.04
13 43.3410 41.1509 39.0236 -1.05 1.02
14 41.1592 39.1381 37.1708 -1.03 1.00
15 39.0998 37.2355 35.4167 -1.00 0.98
16 37.1553 35.4363 33.7555 -0.98 0.96
17 35.3186 33.7344 32.1818 -0.95 0.94
18 33.5833 32.1240 30.6905 -0.93 0.91
19 31.9432 30.5997 29.2769 -0.90 0.89
20 30.3925 29.1565 27.9365 -0.88 0.87
21 28.9259 27.7895 26.6651 -0.85 0.84
22 27.5383 26.4944 25.4589 -0.83 0.82
23 26.2252 25.2670 24.3140 -0.80 0.80
24 24.9822 24.1034 23.2271 -0.78 0.77
25 23.8050 23.0000 22.1950 -0.78 0.77
26 22.7500 21.9499 21.1520 -0.78 0.78
27 21.7477 20.9536 20.1638 -0.82 0.81
28 20.7951 20.0081 19.2272 -0.86 0.85
29 19.8895 19.1104 18.3394 -0.89 0.88
30 19.0285 18.2581 17.4974 -0.93 0.92
31 18.2094 17.4484 16.6988 -0.97 0.95
32 17.4302 16.6792 15.9410 -1.00 0.99
33 16.6885 15.9480 15.2217 -1.04 1.02
34 15.9825 15.2530 14.5389 -1.08 1.06
35 15.3103 14.5920 13.8903 -1.12 1.09
36 14.6700 13.9632 13.2743 -1.16 1.13
37 14.0599 13.3650 12.6889 -1.20 1.16
38 13.4786 12.7957 12.1325 -1.23 1.20
39 12.9244 12.2537 11.6035 -1.27 1.24
40 12.3960 11.7375 11.1004 -1.31 1.27
41 11.8921 11.2459 10.6218 -1.35 1.31
42 11.4113 10.7775 10.1665 -1.39 1.34
43 10.9526 10.3311 9.7330 -1.43 1.38
44 10.5147 9.9056 9.3204 -1.48 1.42
45 10.0967 9.4999 8.9275 -1.52 1.45
46 9.6976 9.1130 8.5532 -1.56 1.49
47 9.3163 8.7439 8.1965 -1.60 1.53
48 8.9521 8.3916 7.8566 -1.64 1.57
49 8.6040 8.0554 7.5327 -1.68 1.60
50 8.2713 7.7345 7.2237 -1.73 1.64
51 7.9531 7.4280 6.9291 -1.77 1.68
52 7.6489 7.1353 6.6480 -1.81 1.72
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Domestic Air Conditioner
53 7.3580 6.8556 6.3797 -1.85 1.76
54 7.0796 6.5884 6.1237 -1.90 1.79
55 6.8131 6.3329 5.8793 -1.94 1.83
56 6.5581 6.0887 5.6459 -1.99 1.87
57 6.3140 5.8552 5.4230 -2.03 1.91
58 6.0802 5.6318 5.2100 -2.07 1.95
59 5.8563 5.4181 5.0065 -2.12 1.99
60 5.6417 5.2136 4.8120 -2.16 2.03
61 5.4361 5.0178 4.6260 -2.21 2.07
62 5.2391 4.8304 4.4481 -2.25 2.11
63 5.0502 4.6510 4.2780 -2.30 2.15
64 4.8691 4.4791 4.1153 -2.35 2.19
65 4.6954 4.3145 3.9596 -2.39 2.23
66 4.5287 4.1567 3.8105 -2.44 2.27
67 4.3689 4.0055 3.6678 -2.49 2.31
68 4.2154 3.8605 3.5312 -2.53 2.35
69 4.0682 3.7216 3.4004 -2.58 2.39
70 3.9268 3.5883 3.2750 -2.63 2.43
71 3.7910 3.4605 3.1549 -2.68 2.48
72 3.6606 3.3378 3.0398 -2.73 2.52
73 3.5353 3.2201 2.9294 -2.77 2.56
74 3.4150 3.1072 2.8237 -2.82 2.60
75 3.2993 2.9987 2.7222 -2.87 2.64
76 3.1881 2.8946 2.6249 -2.92 2.68
77 3.0812 2.7946 2.5316 -2.97 2.73
78 2.9785 2.6986 2.4420 -3.02 2.77
79 2.8796 2.6063 2.3560 -3.07 2.81
80 2.7845 2.5176 2.2735 -3.12 2.86
81 2.6931 2.4324 2.1943 -3.17 2.90
82 2.6050 2.3505 2.1182 -3.22 2.94
83 2.5203 2.2717 2.0451 -3.28 2.99
84 2.4388 2.1960 1.9749 -3.33 3.03
85 2.3602 2.1231 1.9075 -3.38 3.07
86 2.2846 2.0530 1.8426 -3.43 3.12
87 2.2118 1.9856 1.7803 -3.48 3.16
88 2.1416 1.9207 1.7204 -3.54 3.20
89 2.0740 1.8582 1.6628 -3.59 3.25
90 2.0089 1.7981 1.6074 -3.64 3.29
91 1.9461 1.7402 1.5541 -3.70 3.34
92 1.8856 1.6844 1.5028 -3.75 3.38
93 1.8272 1.6307 1.4535 -3.80 3.43
94 1.7709 1.5789 1.4060 -3.86 3.47
95 1.7166 1.5291 1.3603 -3.91 3.52
96 1.6643 1.4810 1.3163 -3.97 3.56
97 1.6138 1.4347 1.2739 -4.02 3.61
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