Haier 2HUM18HC03-R2 User manual

SERVICE MANUAL
Order No.
EK-Series
© (Qingdao Haier Air Conditioner General corp.,Ltd)
All right reserved .Unauthorized copying and distribution is a violation of law
Haier Group
This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or
repair the product or products dealt with in this service information by anyone else could result in serious injury or death
WARNING
Wall mounted Type
DC Inverter
Model No.
HSM07HEKC03/R2(DB)
HSM12HEKC03/R2(DB)
HSM09HEKC03/R2(DB)
HSM09HEKC03/R2(DB)
HSM07HEKC03/R2(DB)
HSM12HEKC03/R2(DB)
2HUM18HC03/R2(DB)
2HUM18HC03/R2(DB)outdoor unit
AC1012S002V0

14
14
40
40
40
28
48
64
68
70
72
Horiaontal Flap
9
9.1
9.2
9.3
75
73
napniarD
74
Vertical Blades and Swing Motor
76
78
9.4
9.5
9.6
9.7
9.8
5.3
22
5.2
68
Removal of Front panel
Removal of Air Filter
of indoor unit
main function and control specification of outdoor unit
2HUM18HC03/R2(DB)-SM

91
91
92
94
11 Description of Coding rules of Unit Model.......................................................95
85
80
86
9.9
9.10 Removal of Fan and Fan motor
9.11
........................................................................
........................................................................
..............................................................
2HUM18HC03/R2(DB)
9.12 Removal of Left Side Plate ...................................................................... 87
9.13 Removal of Fan motor and Bracket .......................................................... 89
9.14 Removal of Right Side Plate........... .......................................................... 93
9.15 Removal of Compressor and Heat Exhanger............................................ 94

Introduction
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
arepair.
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.
1
2HUM8HC03/R2(DB)-SM

Introduction
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
2
2HUM18HC03/R2(DB)-SM

Introduction
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.
3
2HUM18HC03/R2(DB)-SM

Introduction
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
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
4
2HUM18HC03/R2(DB)-SM

Introduction
Domestic Air Conditioner
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.
5
2HUM18HC03/R2(DB)-SM

Category
Healthy negative ion
Child lock
3D air flow
24Hour timer
Easy clean design
Intelligent air
Anti-mold filter
4 Fan setting
Auto mode
Power mode
Soft mode
Note: Y: Holding Functions
N : No Functions
make your room full of an abundance natural negative ions.
Functions
Quick cooling or heating
adjust the last fixed operation mode automatically.
Make dehumidifying in the room while keeping the constant temperature inside
lower noise operation condition
Slect the fan speed LO,MED,HI,AUTO
Constant temperature
dehumidification
Avoid the child's wrong operation on the remote controller
Sleep mode
Catches most small particles and remove unpleasant odors effectively.
With twin-blade technology ,the airflow can be adjusted not to blow directly
The 3D airflow is able to deliver the airflow horizontally and vertically.
Use the timer function to set on,or off,or from on to off,or from off to on
The panel is easy to wash and the airflow vents can be detached easily
The setting temprature and the indoor noise can be adjusted to a more comfortable
level when you set the "sleep mode"during night sleep
Y
N
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
N
HSM09/12HEKC03/R2(DB)
2HUM18HC03/R2(DB)-SM
2HUM18HC03/R2(DB)

19450(5900~22000)
17200(4450~19600)
1575(360~2050) 1570(440~2075)
3.21 3.63 3.63
--
0.15 0.15 0.15 0.15
33 33 33 33
5.7(1.73~6.45)
8.8.
11.3
8.8
11.3
44
5.05(1.3~5.75)
4343(1118~4945)
7
7.6 7.6
1590(385~2065) 1570(490~2125)
7.7 7.6
2.8
30(double)20(single) 30(double)20(single)
20
15
20
20
15
20
360X871X304
3 Specification
4902(1488~5547)
19450(6500~22500)
17400(4750~19800)
5.7(1.91~6.6)
5.1(1.39~5.8)
4386(1195~4988 4902(1643~5676)
3.21
3.2
9.52 9.52
265×795×186
360X871X304
265×795×186
2HUM18HC03/R2(DB)(9+12)K 2HUM18HC03/R2(DB)(12+12)K
2HUM8HC03/R2(DB)-SM
7.5/8.0(7K/9K)
6.6/7.2(7K/9K)
5.7/6.4(7K/9K)
8.3/8.8(12K)
7.2/7.8(12K)
6.1/6.6(12K)
36/30/27(7K/9K)
46
37/30/28(12K)
47
90 90 90 90

0.5
R410a
1.4
0.5
R410a
1.4
35
1236
35
1236
35
1236
35
1236
46.5
43.5
51
688x810x288 688x810x288
745X949X406
46.5
43.5
745X949X406
1575 1570
7.6 7.7
1590 1570
7.6 7.6
51
40
40
61 61
51
51
61 61
900
FV50S
900
FV50S
5
2HUM18HC03/R2(DB)-SM
2MYGF031BNS2MYGF031BNS
88
90 90 90 90

2HUM18HC03/R2(DB)-SM Connector wiring diagram
9
Domestic air conditioner
4.1 Indoor unit Connectors
Connectors
PCB(1)
1) CN26 Connector for fan motor
2) CN1 Connector for heat exchanger thermistor and Room temperature thermistor
3) CN11 Connector for UP&DOWN STEP motor
4) CON2 Connector for power N wire
5) CON1 Connector for power L
6) CN32 Connector for display board
7) C0N6,C0N8 Connector for ions generator
8) CON7 Connector for communicate between the indoor board and the outdoor
board
9) CN27 Connector for fan motor’s PG back.
10) CN34 Connector for long-range control
11) CN20 Connector for room card
Note: Other designations
PCB(1) (INdoor Control PCB)
1) SW1 Connector for Forced operation ON / OFF switch
2) SW2 1 Select remote code A or B,2 Select 25 or 35 ,3 Select room card able or
disable
3) SW4 Select 20 or other,if select 20,SW2 must select 25(ON)
4)RV1 Varistor
5) FUSE1 Fuse 3.15A/250VAC

2HUM18HC03/R2(DB)-SM Connector wiring diagram
10
Domestic air conditioner
PCB(1)
CN11 CN32CN1CN26 CN27 SW1
CON2
CON1
CON8
CON7
CON6
CN34
CN20

2HUM18HC03/R2(DB)-SM Connector wiring diagram
11
Domestic air conditioner
4.2: outdoor unit
Connectors
PCB(1) (Control PCB)
1) CN1,CN2 Connector for power N and L
2) CN3 Connector for ground
3) CN23 Connector for DC POWER 15Vand 5V to the module board
4) CN9,CN10 Connector for CN2,CN1 on the module board
5) CN22 Connector for fan motor
6) CN11 Connector for four way valve coil
7) CN17,CN18,CN19,CN20,CN21 Connector for thermistors
8)CN24 Connector for communicate between the control board and the module board
9) CN28,CN25 Connector to P and N of the module board
10) CN36 Connector for communicate between indoor and outdoor unit
11) CN15,CN16 Connector for electric expansion valves
PCB(2) (module PCB)
CN10 Connector for the DC power 5V and 15V form the control PCB
CN11 Connector for communicate between the control board and the module board
P( CN8), N(CN9) Connector for CN27,CN25 on the control board
LI (CN3),LO(CN4) Connector for reactor
AC_L(CN1),AC_N(CN2) Connector for CN10,CN9 on the control board
CN5(U), CN6(V), CN7(W) connector for the compressor
Note: Other Designations
PCB(1) (Control PCB)
1) FUSE 1, Fuse (25A,250VAC)
2)LED 1 keep light representative normal ,if keep flash interval representative trouble Alarm
3)RV1,RV2,RV3 Varistor

2HUM18HC03/R2(DB)-SM Connector wiring diagram
12
Domestic air conditioner
PCB(1)
CN36
CN17
CN28CN23
CN18
CN16
CN9 CN10 CN3
CN11
CN15
CN24 CN25
CN19
CN20
CN21
CN1
CN2
CN22

2HUM18HC03/R2(DB)-SM Connector wiring diagram
13
Domestic air conditioner
PCB(2)
CN1
CN5
CN6
CN7
CN10
CN11
CN8
CN9
CN4
CN3
CN2

2HUM18HC03/R2(DB)-SM Wiring diagrams
14
Domestic air conditioner
5.Funcitions and Control
5.1 Main functions and control specification of indoor unit
5.1.1 Automatic operation
When the system is under the automatic operation option, the appropriate operation mode will be
decided according to the differences between the preset temperature and the indoor temperature
after the system starts up. Then, the system will operate according to the chosen mode. In the
following conditions, Tr stands for indoor temperature and Ts stands for outdoor temperature.
The system will choose the operation mode according to the following conditions when entering
into the automatic operation option for the first time.
TrıTs-3ćChoose the cooling mode
Tr˘Ts-3ćChoose the warming mode
Under the automatic option, the system will switch between the cooling and warming modes
according to the change of the indoor temperature. If the air conditionic is under the cooling
mode, when the preset temperature for stopping the compressor is reached, the compressor will
be stopped. The indoor temperature will be tested again 15 minutes after the stop of the
compressor. At the moment, if the tested temperature is under the Tr˘Ts - 3ćcondition, the
system will be switched into the warming mode. If not, the system will remain in the cooling mode.
If the air conditionic is under the warming mode, when the preset temperature for stopping the
compressor is reached, the compressor will be stopped. The indoor temperature will be tested
again 15 minutes after the stop of the compressor. At the moment, if the tested temperature is
under the Tr˚Ts +3ćcondition, the system will be switched into the cooling mode. If not, the
system will remain in the warming mode.
5.1.2 Cooling operation mode
Temperature control range: 16ć---30ć
Temperature difference: r1ć
* Control features: When Tr˄input airflow˅>Ts˄set temperature˅ć, the compressor will be
opened,the indoor fan will operate at the set speed and the mode signal will be sent to the
outdoor system. When Tr˄input airflow˅Ts˄set temperature˅ć, the compressor will be
opened,the indoor fan will operate at the set speed and the mode signal will be sent to the
outdoor system. The system will keep the original status if Tr= Ts.
Airflow speed control: (temperature difference 1ć)
Automatic: When Tr>=Ts+3ć, high speed.
When Ts+1ć=<Tr<Ts+3ć, medium speed
When Tr<Ts+1ć, low speed
When the sensor is off, low speed
When the airflow speed has no delay from the high to low switching, the speed should be
delayed for 3 minutes (remain at high speed for 3 minutes.) before the next switch.

2HUM18HC03/R2(DB)-SM Wiring diagrams
15
Domestic air conditioner
Manus: When the system is operating, you can set the high, medium or low speed manually.
( When the sensor is on or off, the system will change the speed 2 seconds after receiving the
signal.)
*Airgate location control: the location for the airgate can be set according to your needs.
*Defrosting function: preventing the frosting on the indoor heat exchanger (when cooling or
demoisture). When the compressor works continuously for 1/6 minutes (adaptable in EEPROM)
and the temperature of the indoor coils has been below zero centigrade for 10 seconds, the
compressor will be stopped and the malfunction will be recorded in the malfunction list. The
indoor system will continue to run. When the temperature of the indoor coil is raised to 7ć, the
compressor will be restarted again (the prerequirement of 3 minutes’ delay should be satisfied.)
* timing system on/off function.
* Dormant control function.
5.1.3 Demoisture mode.
* temperature control range: 16---30ć
* temperature difference: r1ć
Control feature: send the demoisture signal to the outdoor system.
When Tr>Ts+2ć, the compressor will be turned on, the indoor fan will operate at the set speed.
When Tr is between the Ts and Ts+2ć, the outdoor system will operate at the high demoisture
frequency for 10 minutes and then at the low demoisture mode for six minutes. The indoor fan
will operate at low speed.
When Tr< Ts, the outsystem will be stopped, the indoor fan will be stopped for 3 minutes and
then turned to the low speed option.
All the frequency converses have a f1ćdifference.
* Wind speed control: Automatic:
When Tr >= Ts+ 5ć, high speed.
When Ts+3ćdTr< Ts+5ć, medium speed.
When Ts+2ćdTr< Ts+3ć, low speed.
When Tr<Ts+2ć, light speed.
If the outdoor fan stopped, the indoor fan will be paused for 3 minutes.
If the outdoor fan stopped for more than 3 minutes and the outdoor system still operates, the
system will be changed into light speed mode.
When the airflow speed has no delay from the high to low switching, the speed should be
delayed for 3 minutes (remain at high speed for 3 minutes.) before the next switch.
Manual: When the sensor is off or Tr< Ts+3ć, the manual operation can not be made. (obligatory
automatic operation.)
*Airgate location control: the location for the airgate can be set according to your needs.
*Defrosting function: preventing the frosting on the indoor heat exchanger (when cooling or
demoisture). When the compressor works continuously for 1/6 minutes (adaptable in EEPROM)
and the temperature of the indoor coils has been below zero centigrade for 10 seconds, the
compressor will be stopped and the malfunction will be recorded in the malfunction list. The
indoor system will continue to run. When the temperature of the indoor coil is raised to 7ć, the
compressor will be restarted again (the prerequirement of 3 minutes’ delay should be satisfied.)
* coil protection (synchronic overheating protection) are installed for the four directions latch
malfunctions when demoisturing.

2HUM18HC03/R2(DB)-SM Wiring diagrams
16
Domestic air conditioner
* timing system on/off function.
* Dormant control function.
5.1.4 Heating operation mode.
* temperature control range: 16---30ć
* temperature difference: r1ć
* control feature: the temperature compensation is automatically added and the system will send
the heating signals to the outdoor system.
If TrdTs, the outdoor compressor is turned on, the indoor fan will be at the cold air proof mode.
If Tr>Ts+, the outdoor system is turned off, the indoor fan will be at the heat residue sending
mode.
If Tr<Ts+, the outdoor system will be turned on again, the indoor fan will be at the cold air proof
mode.
*Indoor fan control
manual control: You can choose high, medium, low and automatic speed control.
Automatic: When Tr<Ts, high speed.
When Ts=<Tr=<Ts+2ć, medium speed.
When Tr> Ts+2ć, low speed.
When the airflow speed has no delay from the high to low switching, the speed should be
delayed for 3 minutes (remain at high speed for 3 minutes.) before the next switch.
*Airgate location control: the location for the airgate can be set according to your needs.
Coldair proof operation
1. The indoor operation within 4 minutes after the start up is as the following diagram, the air
speed can be raised only after the speed has reached a certain level.










2. 4 minutes after the start up of the indoor fan, the light airflow and the low airflow will be turned
to the set speed airflow.
3. In the cold air proof operation, the fan won’t stop after the start up.
4. During the cold air proof operation, the indoor system will continuously send ‘indoor high
speed’ signals to the outdoor system.
* Residue heat sending. The indoor fan will send the residue heat at a low speed for 12 seconds.
If other conditions are satisified, when the compressor stops, the indoor system will operate at a
light speed. The indoor fan will stop when the coil temperature is below the ‘heat start temp 4’.
* Defrosting. When the system receives the defrosting signal from outdoors, the indoor fan will
stop and the indoor temperature display won’t change. At the time, any indoor coil malfunctions
will be neglected. When the outdoor defrosting finishes, the coil malfunction will still be neglected
Heat start temp 1
Heat start temp 2
Heat start temp 3
Heat start temp 4
Set speed
Low speed
Light speed
Fan/off
Fan/off
Keep the hig
h
speed. The fa
n
doesn’t stop

2HUM18HC03/R2(DB)-SM Wiring diagrams
17
Domestic air conditioner
until the compressor has been started up for 30 seconds. The indoor temperature display will not
change and the system operates at the cold air proof mode.
* Automatic heating temperature compensation: when the system enters the heating mode, the
temperature compensation (4) will be added. When the status is switched off, the compensation
will be erased.
5.1.5 strength operation
a. the system enters the mode after receiving the ‘strength signal’.
Send strength operation signal to the outdoor system.
The mode change finishes the strength operation.
Entering ‘mute’, you can have normal operation or signal control such as timing to finish the
strength operation.
When the system is at the automatic option with the strength/ mute function, if the system enters
the cooling mode, the cooling strength/ mute function will be offered; if the system enters the
heating mode, then the heating strength/ mute function will be offered; if the system enters the
airflow mode, there will be no strength/ mute function.
5.1.6 Mute operation
the system enters the mode after receiving the ‘mute signal’.
a. Mute heating: the airflow speed is slight, the system sends the mute signal to the outdoor
system.
b. mute cooling: the airflow speed is slight, the system sends the mute signal to the outdoor
system.
When the compressor operates, the airflow speed is mute speed. EEPROM is adaptable.
Mute operation can not work under the demoisturing and airflow-sending operation.
5.1.7 Air refreshing
After receiving the signal from the remote control,(HV series: the background light of the ‘health’
logo is green. HS series: the ‘health’indicator will be lighted). If the fan operates, the negative ion
generator operates to realize the negative sending function.
If the indoor fan stops, the negative ion generator is turned off.
When the negative ion generator is turned off, if the air refreshing system is turned on, the
negative ion generator will be turned on when the fan operates.
5.1.8 Timing.
You can set 24 hours’ on/off timing accordingly. After the setting, the timing indicator will be
lightened. Also, the light will be turning off after the timing is finished. The followings are several
timing methods.
1.system /on timing: The timing indicator will be lightened and the indoor system is under the