Friedrich AS - W126BMS0 User manual

Room Air Conditioner
SVC MANUAL(General)
CAUTION
Before Servicing the unit, read the safety
precautions in General SVC manual.
Only for authorized service personnel.
960-914-06

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Air Conditioner Service Manual
CONTENTS
Part 1 General Information
1. Safety Precautions........................................................................................................4
2. Nomenclature ...............................................................................................................7
Part 2 Functions & Controls
1. List of Functions & Controls........................................................................................9
2. Basic Mode Controls .................................................................................................10
3. Special Mode Controls ...............................................................................................12
4. Utility Functions .........................................................................................................13
Part 3 Test Run
1. Check before Test Run ...............................................................................................17
2. Test Run Flow chart ....................................................................................................18
3. Test Run Detail ............................................................................................................19
Part 4 Trouble Shooting Guide
1. 2-Way, 3-Way Valve ....................................................................................................21
2. Pumping Down ...........................................................................................................22
3. Evacuation (All amount of refrigerant leaked) ........................................................23
4. Gas Charging (After Evacuation) ..............................................................................24
5. Cycle Troubleshooting Guide ....................................................................................25
6. Electric Parts Troubleshooting Guide.......................................................................28
7. Self-diagnosis Function .............................................................................................32
■Indoor Unit Error .................................................................................................... 32
■Outdoor Unit Error ..................................................................................................34
■Trouble Shooting Guide (Indoor Unit)....................................................................36
■Trouble Shooting Guide [Outdoor Unit (2 LED Type)] ..........................................41
■Trouble Shooting Guide [Outdoor Unit (1 LED Type)] ..........................................56

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1. Safety Precautions ............................................................................................................4
2. Nomenclature......................................................................................................................7
Part 1 General Information

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Part 1 General Information
1. Safety Precautions
1.1 Cautions in Repair
To prevent injury to the user or other people and property damage, the following instructions must be followed.
■Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the follow-
ing indications.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
■Meanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
Dangerous Voltage
Be sure to disconnect the power cable plug from the plug socket before disas-
sembling the equipment for a repair.Internal components and circuit boards are at
main potential when the equipment is connected to the power cables. This high
voltage is extremely dangerous and may cause death or severe injury if come in
contact with it.
Do not touch the discharging refrigerant gas during the repair work.
The discharging refrigerant gas.The refrigerant gas can cause frostbite.
Release the refrigerant gas completely at a well-ventilated place first.
Otherwise, when the pipe is disconnected, refrigerant gas or refrigerating
machine oil discharges and it Can cause injury.
When the refrigerant gas leaks during work, perform ventilation. If the refrigerant
gas comes in contact with a fire, poisonous gas generates. A case of leakage of
the refrigerant and the closed room full with gas is dangerous because a shortage
of oxygen occurs. Be sure to perform ventilation.
When removing the front panel or cabinet, execute short-circuit and discharge
between high voltage capacitor terminals. If discharge is not executed, an electric
shock is caused by high voltage resulting in a death or injury.
Do not turn the air-conditioner ON or OFF by plugging or unplugging the power
plug. There is risk of fire or electrical shock.

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Part 1 General Information
Do not turn on the breaker when the front panel and cabinet are removed.
Be sure to ground the air conditioner with an earthing conductor connected to
the earthing terminal.
Conduct repair works after checking that the refrigerating cycle section has
cooled down sufficiently. Otherwise, working on the unit, the hot refrigerating
cycle section can cause burns.
Do not tilt the unit while removing panels. Otherwise, the water inside the unit
can spill and wet floor.
Do not use the welder in a well-ventilated place. Using the welder in an enclosed
room can cause oxygen deficiency.
Be sure to turn off power switch before connecting or disconnecting connector,
or parts damage may be occur.
Do not use a defective or underrated circuit breaker. Use the correctly rated
breaker and fuse. Otherwise there is a risk of fire or electric shock.
Install the panel and the cover of control box securely. Otherwise there is risk of
fire or electric shock due to dust, water etc.
Indoor/outdoor wiring connections must be secured tightly and the cable should
be routed properly so that there is no force pulling the cable from the connection
terminals. Improper or loose connections can cause heat generation or fire.
Do not touch, operate, or repair the product with wet hands. Holding the plug by
hand when taking out. Otherwise there is risk of electric shock or fire.

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Part 1 General Information
Check to see if the parts are mounted correctly and wires are connected.
Improper installation and connections can cause an electric shock or an injury.
Check whether the installation platform or frame has corroded. Corroded installa-
tion platform or frame can cause the unit to fall, resulting in injury.
Be sure to check whether the earth wire is correctly connected.
After the work has finished, be sure to do an insulation test to check whether the
resistance is 2[Mohm] or more between the charge section and the non-charge
metal section (Earth position). If the resistance value is low, a disaster such as a
leak or electric shock is caused at user’s side.
Check the drainage of the indoor unit after the repair. If drainage is faulty the
water may enter the room and wet floor.
1.2 Inspections after Repair
Check to see if the power cable plug is not dirty or loose. If the plug is dusty or
loose it can cause an electrical shock or fire.
Do not use a joined power cable or extension cable, or share the same power
outlet with other electrical appliances. otherwise, it can cause an electrical shock,
excessive heat generation or fire.
Do not insert hands or other objects through the air inlet or outlet while the prod-
uct is operating. There are sharp and moving parts that could cause personal
injury.
Do not block the inlet or outlet of air flow. It may cause product failure

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Part 1 General Information
2. Nomenclature
2.1 Global Model Name
Code Type Code of Model Meaning
1 Production Center, A~Z L: Chang-won R22
Refrigerant A: Chang-won R410A
U: Tianjin R410A
2 Product Type A~Z S: Split Type Air Conditioner
3 Cooling/Heating/Inverter A~Z C: Cooling Only
H: Heat Pump
X: C/O + E/Heater
Z: H/P + E/Heater
V: AC Inverter C/O
N: AC Inverter H/P
Q: DC Inverter C/O
W: DC Inverter H/P
4, 5 Capacity 0~9 Cooling/Heating Capacity
Ex. "09" →9,000 Btu/h
6 Electric Range 1~9 1: 115V/60Hz
A~Z 2: 220V/60Hz
3: 208-230V/60Hz
5: 200-220V/50Hz
6: 220-240V/50Hz
7: 110V, 50/60Hz
7 Chassis A~Z Name of Chassis
8 Look A~Z Look,
Color (Artcool Model)
9 Function A~Z
10 Serial No. 1~9 Model Development Serial No.
12 -345678910
Basic A
Basic+4Way B
Basic+Deodorizing Filter (Carbon filter) C
Plasma+(A/changeove)+A/clean+2Way+Ion E
Plasma+(A/changeove)+A/clean+4way+Ion+Lamp F
Plasma+(A/changeove)+A/clean+Low A G
Plasma+(A/changeove)+A/clean+4way+Low A H
Plasma+(A/changeove)+A/clean L
Plasma+(A/changeove)+A/clean+4way M
Plasma+(A/changeove)+A/clean+PTC N
Plasma+(A/changeove)+Autoclean+4way+PTC P
Plasma+(A/changeove)+A/clean+4way+Low A+PTC Q
Smart(Robot) Cleaning R
Eco eye+Plasma+Allergy Filter+4way S
Plasma+Allergy Filter+4way U
Allergy Filter+4way V
Allergy Filter+2way W
Basic+Low Ambient Y
Basic+(A/clean)+4way+Low A Z
AS-W126BMS0

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Part 2 Functions & Controls
1. List of Controls & Functions ..........................................................................................9
2. Basic Mode Controls......................................................................................................10
3. Special Mode Controls...................................................................................................12
4. Utility Functions .............................................................................................................13

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Part 2 Functions & Controls
1. List of Functions & Controls
Cooling Mode
Heating Mode
Healthy Dehumidification
Auto Changeover
Jet Cool
Jet Heat
Energy saving
Forced operation
Auto Clean
Air volume control
Natural Air control
Auto Swing
Sleep mode Auto control
Auto Restart Function
Category Function Description Remark
Cooling operation
Heating operation
Dry operation
Cooling mode is automatically changed to heating mode and
vice versa
Powerful cooling mode
Powerful heating mode
Air volume & set temp. are automatically selected for saving
energy in cooling mode
Operation without remote controller
After cooling operation, this function makes the evaporator
dry
Indoor Fan speed Control
Air volume control Program
Vertical Airflow Direction control
Air volume & set temp. are automatically changed for com-
fortable sleep
When power returns after a power failure, Unit restarts in the
previous operating mode
Basic mode
controls
Special Mode
controls
Utility Functions
NOTE: The Exploded View SVC Manual has the particular Function table for each model.

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Part 2 Functions & Controls
2. Basic Mode Controls
2.1 Cooling Mode
Setting
Temp.
-0.5C(-1F)
+0.5C(1F)
Comp. OFF
Thermo ON
Thermo OFF
INV. Comp.
Frequency LowHigh LowHigh
• Operating frequency of compressor depends on the load condition, like the difference between the room temp. and
the set temp., frequency restrictions.
• If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 90
seconds. ( not emergency conditions)
• Compressor turned off when
- Intake air temperature reaches below 0.5°C(1°F) of the setting temperature for three minute continuously.
- Intake air temperature reaches below 1.5°C(3°F) of the setting temperature
• Compressors 3 minute time delay.
- After compressor off, the compressor can restart minimum 3 minute later.
2.2 Heating Mode
2˚C(3.6˚F)
4˚C(˚F)
Comp. OFF
INV. Comp.
Frequency LowHigh LowHigh Comp. OFF
Setting
Temp.
Thermo ON
Thermo OFF
• Operating frequency of compressor depend on the load condition, The difference between the room temp. and set
temp., frequency restrictions.
• If compressor operates at some frequency, the operating frequency of compressor cannot be changed within 90 sec-
onds.
• Condition of compressor turned off
- When intake air temperature reaches 4°C(°F) above the setting temperature.
• Condition of compressor turned on
- When intake air temperature reaches below 2°C(3.6°F) of above the setting temperature.
* Condition of indoor fan turned off
• While in defrost control, the indoor and outdoor fans are turned off.
• Compressor 3 minute delay
- After compressor off, the compressor can restart minimum 3 minute later.