HEAT CONTROLLER, INC.
Wall Mounted
Multi-Split System
Air Conditioning/Heat Pump
DMH18DB-1
Before servicing the unit, read the
“safety precautions” in this manual.
Only for authorized service personnel.
Multi type Air Conditioner Service Manual
TABLE OF CONTENTS
Combination table.......................................................................................................................................3
Safety Precautions......................................................................................................................................4
Dimensions................................................................................................................................................10
Indoor Unit.............................................................................................................................................10
Outdoor Unit ...........................................................................................................................................11
Product Specifications .............................................................................................................................12
A-DMH18DB-1 .......................................................................................................................................12
B-DMH18DB-1 .......................................................................................................................................13
Installation .................................................................................................................................................14
Installation Parts.....................................................................................................................................14
Installation Tools.....................................................................................................................................14
Select the best location .........................................................................................................................15
Piping length and elevation ....................................................................................................................16
Fixing Installation Plate(Standard Type).................................................................................................17
Flaring Work and Connection of Piping..................................................................................................18
Flaring work............................................................................................................................................18
Connecting the Piping ............................................................................................................................19
Connecting the Cable between Indoor Unit and Outdoor Unit .............................................................25
Connect the cable to the Indoor unit. .....................................................................................................25
Connect the cable to the Outdoor unit....................................................................................................26
Connection method of the connecting cable(Example)..........................................................................27
Connect the cable to the indoor unit.......................................................................................................28
Checking the Drainage, Forming the Pipings and Long Pipe Setting .................................................29
Checking the drainage............................................................................................................................29
Forming the piping..................................................................................................................................30
Air Purging and Evacuation.....................................................................................................................31
Checking method ...................................................................................................................................31
Evacuation..............................................................................................................................................32
Charging ....................................................................................................................................................33
Test Running .............................................................................................................................................34
Operation ...................................................................................................................................................35
Function of control..................................................................................................................................35
Function of Indoor Unit ...........................................................................................................................40
Function of Outdoor Unit ........................................................................................................................41
Remote Control Operation .....................................................................................................................42
Disassembly ..............................................................................................................................................43
Indoor Unit..............................................................................................................................................43
Schematic Diagram...................................................................................................................................46
Electronic Control Device .......................................................................................................................46
Wiring Diagram.......................................................................................................................................49
Components Locations...........................................................................................................................50
Troubleshooting Guide .............................................................................................................................54
Refrigeration Cycle Diagram ..................................................................................................................54
Self-diagnosis Function ..........................................................................................................................55
Cycle Troubleshooting Guide..................................................................................................................56
Electronic Parts Troubleshooting Guide .................................................................................................57
Error Code..............................................................................................................................................62
2-way, 3-way Valve ....................................................................................................................................66
Exploded View & Replacement Parts List ..............................................................................................70
Indoor Unit .............................................................................................................................................70
Outdoor Unit ...........................................................................................................................................72
2 Multi type Air Conditioner
Operation
1 Unit
2 Unit
Combination of Indoor Unit(kBtu/h)
Cooling
Each Capacity
Unit-A Unit-B
UNIT-A(Btu/h) UNIT-B(Btu/h)
Total Btu/h kW
UNIT-A(Btu/h) UNIT-B(Btu/h)
Btu/h kW
Total Capacity Each Capacity Total Capacity
Heating
9
99918
9000
9000
-
9000
9000
18000
9000
18000
2.63
5.27
2.63
5.27
9000
9000
-
9000
NOTICE
Combination table
Combination table
Notes :
1.Cooling Capacity is based on : indoor temp. 26.7°C(80.1°F)DB, 19.4°C(66.9°F)WB; outdoor temp. 35°C(95°F)DB, 23.9°C(75°F)WB
2.Heating Capacity is based on : indoor temp. 21.1°C(70°F)DB, 15.6°C(60.1°F)WB; outdoor temp. 8.3°C(46.9°F)DB, 6.1°C(43°F)WB
3.The total ability of connected a indoor unit is up to 18k Btu/h
Symbols Used in this Manual
This symbol alerts you to the risk of electric shock.
This symbol alerts you to hazards that could cause harm to the
air conditioner.
This symbol indicates special notes.
Service Manual 3
Safety Precautions
WARNING
CAUTION
WARNING
Safety Precautions
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 following 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.
■ Installation
Do not use a defective or underrated circuit breaker. Use this
appliance on a dedicated circuit.
• There is risk of fire or electric
shock.
Install the panel and the cover
of control box securely.
• There is risk of fire or electric
shock.
For electrical work, contact the
dealer, seller, a qualified electrician,
or an Authorized Service Center
• Do not disassemble or repair the
product. There is risk of fire or
electric shock.
Always install a dedicated circuit and breaker.
• Improper wiring or installation may
cause fire or electric shock
.
• There is risk of fire or electric
Always ground the product.
• There is risk of fire or electric
shock.
Use the correctly rated breaker or fuse.
shock.
4 Multi type Air Conditioner
Safety Precautions
Do not install, remove, or reinstall the unit by yourself
(customer).
• There is risk of fire, electric shock,
explosion, or injury.
Do not install the product on a
defective installation stand.
• It may cause injury, accident, or
damage to the product.
Be cautious when unpacking
and installing the product.
• Sharp edges could cause injury.
Be especially careful of the case
edges and the fins on the condenser and evaporator.
Be sure the installation area
does not deteriorate with age.
• If the base collapses, the air conditioner could fall with it, causing
property damage, product failure,
and personal injury.
For installation, always contact the dealer or an
Authorized Service Center.
• There is risk of fire, electric shock,
explosion, or injury.
Do not let the air conditioner
run for a long time when the
humidity is very high and a
door or a window is left open.
• Moisture may condense and wet or
damage furniture.
Do not allow water to run into
electric parts.
• It may cause There is risk of fire,
failure of the product, or electric
shock.
Do not store or use flammable
gas or combustibles near the
product.
• There is risk of fire or failure of
product.
Gasolin
Do not use the product in a
tightly closed space for a long
time.
• Oxygen deficiency could occur.
Service Manual 5
Safety Precautions
When flammable gas leaks,
turn off the gas and open a
window for ventilation before
If strange sounds, or smoke
comes from product. Turn the
breaker off.
turn the product on.
• Do not use the telephone or turn
switches on or off. There is risk of
explosion or fire
Do not open the inlet grill of the product
during operation. (Do not touch the electrostatic filter, if the unit is so equipped.)
• There is risk of physical injury,
electric shock, or product failure.
• There is risk of electric shock or
fire.
When the product is soaked
(flooded or submerged), contact
an Authorized Service Center.
• There is risk of fire or electric
shock.
Stop operation and close the
window in storm or hurricane.
If possible, remove the product from the window before
the hurricane arrives.
• There is risk of property damage,
failure of product, or electric shock.
Be cautious that water could
not enter the product.
• There is risk of fire, electric shock,
or product damage.
Ventilate the product from time to time when
operating it together with a stove, etc.
• There is risk of fire or electric shock.
6 Multi type Air Conditioner
Turn the main power off when cleaning or
maintaining the product.
• There is risk of electric shock.
Safety Precautions
CAUTION
When the product is not to be used for a long time,
disconnect the power by turning off the breaker.
• There is risk of product damage or failure, or unintended operation.
■ Installation
Always check for gas (refrigerant) leakage after installation or repair of product.
Install the drain hose to ensure that
water is drained away properly.
Take care to ensure that nobody could step on
or fall onto the outdoor unit.
• This could result in personal injury and product damage.
Keep level even when
installing the product.
• Low refrigerant levels may cause
failure of product.
Do not install the product
where the noise or hot air
from the outdoor unit could
oftend neighbors.
• It may cause a problem for your
neighbors.
• A bad connection may cause water
leakage.
Use two or more people to lift
and transport the product.
• Avoid personal injury.
• To avoid vibration or water leakage.
90°
Do not install the product
where it will be exposed to
sea wind (salt spray) directly.
• It may cause corrosion on the
product. Corrosion, particularly on
the condenser and evaporator fins,
could cause product malfunction or
inefficient operation.
Service Manual 7
Safety Precautions
■ Operational
Do not expose the skin directly to cool air for long periods
of time.
(Don't sit in the draft.)
• This could harm to your health.
Use a soft cloth to clean. Do
not use harsh detergents, solvents, etc.
• There is risk of fire, electric shock,
or damage to the plastic parts of
the product.
Do not use the product for
special purposes, such as
preserving foods, works of
art, etc. It is a consumer air
conditioner, not a precision
refrigeration system.
• There is risk of damage or loss of
property.
Do not touch the metal parts of
the product when removing the
air filter. They are very sharp!
• There is risk of personal injury.
Do not block the inlet or outlet
of air flow.
• It may cause product failure.
Do not step on or put anyting
on the product. (outdoor
units)
• There is risk of personal injury and
failure of product.
Thinner
Wax
Always insert the filter securely. Clean the filter every two
weeks or more often if necessary.
•
A dirty filter reduces the efficiency of
the air conditioner and could cause
product malfunction or damage.
8 Multi type Air Conditioner
Do not insert hands or other
objects through the air inlet or
outlet while the product is
operated.
• There are sharp and moving parts
that could cause personal injury.
Do not drink the water drained
from the product.
• It is not sanitary and could cause
serious health issues.
Safety Precautions
Use a firm stool or ladder when cleaning or
maintaining the product.
• Be careful and avoid personal injury.
Do not recharge or disassemble the batteries.
Do not dispose of batteries in a fire.
• They may burn or explode.
Replace the all batteries in the remote control
with new ones of the same type. Do not mix
old and new batteries or different types of batteries.
• There is risk of fire or explosion
If the liquid from the batteries gets onto your
skin or clothes, wash it well with clean water.
Do not use the remote if the batteries have
leaked.
• The chemicals in batteries could cause burns or other
health hazards.
Service Manual 9
Dimensions
Installation plate
D
H
W
Dimensions
Indoor Unit
Split Type Indoor
Model
Dimension
W mm(in) 870(34.2)
Split Type(S4)
9 kBtu/h
H mm(in) 270(10.6)
D mm(in) 153(6)
10 Multi type Air Conditioner
Outdoor Unit
W
D
L1
L2
L4
L3
H
L7L5L6
Dimensions
MODEL
DIM
W mm(in) 870(34.3)
H mm(in) 655(25.8)
D mm(in) 320(12.6)
L1 mm(in) 370(14.6)
L2 mm(in) 25(1.0)
L3 mm(in) 775(30.5)
L4 mm(in) 25(1.0)
L5 mm(in) 546(21.5)
L6 mm(in) 160(6.3)
L7 mm(in) 160(6.3)
UE
18kBtu/h
Service Manual 11
Product Specifications
Product Specifications
Outdoor Unit
Nominal Capacity Cooling kW
(Min~Rating~Max) Btu/h
Nominal Input Cooling kW
(Min~Rating~Max) Heating kW
Testing Combination
Running Current(Rating) Cooling A
Starting Current Cooling/Heating A
Power Supply Ø / V / Hz
Power Supply Cable(Outdoor) No. x mm
Power and Transmission Cable
(Outdoor to Indoor or Outdoor to BD)
Power and Transmission Cable(BD to Indoor) No. x mm
Dimensions W x H x D mm(inch)
Net Weight kg(lbs)
Max. Number of Connectable Indoor Units
Compressor (#1) Type
Compressor (#2) Type
Compressor (#3) Type
Refrigerant Cycle A Charge (at 7.5m) g(oz)
Additional Refrigerant Charge g/m(oz/ft)
Heat Exchanger (Rows x Column x FPI) x No.
Fan Capacitor µF/Vac
Sound Level(H/L) Sound Pressure dB(A)+3
Piping Connections Liquid(Cycle A) mm(inch)
Max. Interunit Total Piping m(ft)
Piping Length Main Piping m(ft)
Max. Elevation Outdoor Unit~Indoor Unit m(ft)
Difference Indoor Unit~Indoor Unit m(ft)
Operation Range Cooling ˚C(˚F)
(Outdoor) Heating ˚C(˚F)
Note:
1. Capacities are based on the following conditions:
Cooling: - Indoor Temperature 26.7˚C(80˚F) DB/19.4˚C(67˚F) WB
Heating: - Indoor Temperature 21.1˚C(70˚F) DB/15.6˚C(60˚F) WB
Piping Length - Interconnecting Piping Length 7.5m
Heating kW
Heating A
Qty x Model
Motor type
Oil charge volume cc
Oil Type
Qty x Model
Motor type
Oil charge volume cc
Oil type
Qty x Model
Motor type
Oil charge volume cc
Oil type
Cycle B Charge (at 7.5m) g(oz)
Type
Control
Defrosting Method
Drive
Discharge Direction(Side/Top)
Air Flow Rate x No. of Fan CMM(cfm)
Gas(Cycle A) mm(inch)
Liquid(Cycle B) mm(inch)
Gas(Cycle B) mm(inch)
High Pressure Gas mm(inch)
Total Branch Piping m(ft)
Each Branch Piping m(ft)
- Outdoor Temperature 35˚C(95˚F) DB/23.9˚C(75˚F) WB
- Outdoor Temperature 8.3˚C(47˚F) DB/6.1˚C(43˚F) WB
- Level Difference of Zero
Btu/h
No. x mm
2
2
2
A-DMH18DB-1
5.27
18000
5.27
18000
1.98
1.96
A2NH093GCA0
8.8
8.6
13
1/208~230/60
3*2.5
4*0.75
-
870*655*320(34.3*25.8*12.6)
60(132.2)
2
Rotary(Non Tropical)
1*GK113KAA
Induction Motor
330
FVC68D
Rotary(Non Tropical)
1*GK094KAA
Induction Motor
330
FVC68D
-
-
-
-
-
1400(49)
-
R410A
EEV
20(0.22)
(2R X 28C X 18) X 1
Reversing Cycle
6/370
Direct Drive
Side
50(1765.7)
51
6.35(1/4)
9.52(3/8)
-
-
30(98.4)
15(49.2)
-
7.5(24.6)
7.5(24.6)
7.5(24.6)
21~43(69.8~109.4)
-5~24(23~75.2)
2. Wiring cable size must comply with the applicable local and national code.
3. The specification may be subject to change without prior notice for purpose
of improvement.
12 Multi type Air Conditioner
Product Specifications
Indoor Unit
Power Supply Ø / V / Hz
Cooling Capacity kW
Heating Capacity kW
Current Nominal Running Current A
Fan Motor Type
Fan Type
Motor Output(W) x No. of Unit
Air Flow Rate CMM
(H / M / L) cfm
External Static Pressure mmAq
Capacitor µF / Vac
Drive
Coil Row x Column x FPI
Dimensions (W x H x D) Body mm(inch)
Decorative Panel mm(inch)
Net Weight Body kg (lbs)
Decorative Panel kg (lbs)
Air Filter
Sound Level (H / M / L) dB(A)+3
Piping Connections Liquid mm (inch)
Gas mm (inch)
Drain(OD/ID) mm
Dehumidification Rate l/h
Safety Devices
Temperature Sensor
Referigerant
Referigerant Control
Connectable Outdoor Unit
Power and Transmission Interunit Cable No. x mm
Btu/h
Btu/h
2
B-DMH18DB-1
1/208~230/60
2.63
9000
2.63
9000
0.5
BLDC
Cross Flow fan
15*1
7
247.1
-
-
Direct drive
2*15*20
870*270*153(34.2*10.6*6)
-
7(15.4)
-
Long life filter
31/27/21
6.35(1/4)
9.52(3/8)
20/13
1.2
Fuse
Thermistor
R-410A
EEV(Outdoor Unit)
Multi
4*0.75
Note:
1. Capacities are based on the following conditions:
Cooling: - Indoor Temperature 26.7˚C(80˚F) DB/19.4˚C(67˚F) WB
Heating: - Indoor Temperature 21.1˚C(70˚F) DB/15.6˚C(60˚F) WB
Piping Length - Interconnecting Piping Length 7.5m
2. Wiring cable size must comply with the applicable local and national code.
3. The specification may be subject to change without prior notice for purpose of improvement.
- Outdoor Temperature 35˚C(95˚F) DB/23.9˚C(75˚F) WB
- Outdoor Temperature 8.3˚C(47˚F) DB/6.1˚C(43˚F) WB
- Level Difference of Zero
Service Manual 13
Installation
Type "A" screw and plastic anchor
Type "B" screw
Remote Control Holder
Installation plate
Figure FigureName
Screw driver
Electric Drill
Measuring Tape, Knife
Hole Core Drill
Spanner
Torque wrench
Ohmmeter
Hexagonal wrench
Ammeter
Gas Leak Detector
Thermometer,
Level
Flaring Tool Set
Name
Installation
Read carefully, and then follow step by step.
Installation Parts
Installation Tools
14 Multi type Air Conditioner
Select the best location
More than 20cm
(7.9 inch)
More than 30cm
(11.8 inch)
More than 30cm
(11.8 inch)
Indoor unit
1. Do not have any heat or steam near the unit.
2. Select a place where there are no obstacles in front
of the unit.
3. Make sure that condensation drainage can be conveniently routed away.
4. Do not install near a doorway.
5. Ensure the spaces indicated by arrows from the wall,
ceiling, fence or other obstacles.
6. Use a stud finder to locate studs to prevent unnecessary damage to the wall.
Installation
Outdoor unit
1. If an awning is built over the unit to prevent direct
sunlight or rain exposure, make sure that heat radiation from the condenser is not restricted.
2. Ensure that the spaces indicated by arrows around
front, back and side of the unit.
3. Do not place animals and plants in the path of the
warm air.
4. Take the air conditioner weight into account and
select a place where noise and vibration are minimum.
Select a place so that the warm air and sound from
5.
the air conditioner do not disturb neighbors.
Rooftop Installations:
If the outdoor unit is installed on a roof structure, be
sure to level the unit. Ensure the roof structure and
anchoring method are adequate for the unit location.
Consult local codes regarding rooftop mounting.
more than 20cm
(7.9 inch)
more than 70cm
(27.6 inch)
more than 20cm
(7.9 inch)
more than 60cm
(23.6 inch)
Service Manual 15
Installation
B
h2
h1
A
B
h1
Piping length and elevation
Multi Piping Type
Capacity(Btu/h)
Max total length of
all pipes (A+B)
Max length of each
pipe (A/B)
Min length of each
pipe (A/B)
Max Elevation
between each
indoor unit and out-
Max elevation
between indoor
door unit (h1)
18k 30m(100ft) 15m(50ft) 5m(16ft) 7.5m(25ft) 7.5m(25ft)
Pipe Size
Indoor Capacity
(Btu/h)
Gas Liquid Standard Length Additional Refrigerant
9k 9.52mm(3/8") 6.35mm(1/4") 7.5m(25ft) 20g/m(0.22oz/ft)
units (h2)
CAUTION: Capacity is based on standard length and maximum allowance length is on the
basis of reliability.
16 Multi type Air Conditioner
Fixing Installation Plate
Installation Plate
Type "A" screw
Chassis
Hook
The wall you select should be strong and solid
enough to prevent vibration
1. Mount the installation plate on the wall with
type "A" screws. If mounting the unit on a concrete
wall, use anchor bolts.
• Mount the installation plate horizontally by aligning
the centerline using a level.
2. Measure the wall and mark the centerline. It is also
important to use caution concerning the location of
the installation plate. Routing of the wiring to power
outlets is through the walls typically. Drilling the
hole through the wall for piping connections must
be done safely.
Installation
CHASSIS
(Grade)
S4 50(1.97) 105(4.13) 59(2.32) 105(4.13)
Distance (mm/inch)
ABCD
D
C
Ø70mm
(Ø2.75inch)
Left rear piping Right rear piping
Installation plate
B
A
(Ø2.75inch)
Ø70mm
Service Manual 17
Flaring Work and Connection of Piping
Copper
pipe
90°
Slanted Uneven Rough
Flaring Work and Connection of Piping
Flaring work
Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the following procedure.
Cut the pipes and the cable.
1. Use the piping kit accessory or the pipes purchased
locally.
2. Measure the distance between the indoor and the outdoor unit.
3. Cut the pipes a little longer than measured distance.
4. Cut the cable 1.5m (5.0ft) longer than the pipe length.
Burrs removal
1. Completely remove all burrs from the cut cross section
of pipe/tube.
Pipe
Reamer
2. Put the end of the copper tube/pipe in a downward
direction as you remove burrs in order to avoid dropping
burrs into the tubing.
Putting nut on
• Remove flare nuts attached to indoor and outdoor unit,
then put them on pipe/tube having completed burr
removal.
(not possible to put them on after flaring work)
Flaring work
• Carry out flaring work using flaring tool as shown below.
• Firmly hold copper pipe in a Bar in the dimension shown
in the table below.
Outside diameter A
mm inch mm
Ø6.35 1/4 1.1~1.3
Ø9.52 3/8 1.5~1.7
Bar
Point down
Copper tube
"A"
Copper pipe
Clamp handle
Flare nut
Handle
Bar
Yoke
Cone
Red arrow mark
18 Multi type Air Conditioner
Flaring Work and Connection of Piping
Inclined
Inside is shiny without scratches
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Check
1. Compare the flared work with the figure.
2. If a flared section is defective, cut it off and do flaring
work again.
Connecting the Piping
Indoor
1. Prepare the indoor unit's piping and drain hose for installation through the wall.
2. Remove the plastic tubing retainer(see the illustration) and pull the tubing and drain hose away from
chassis.
3. Replace the plastic holder in original position.
For right rear piping
1. Route the indoor tubing and the drain hose in the
direction of rear right.
Insert the connecting cable into the indoor unit from the
2.
outdoor unit through the piping hole.
• Do not connect the cable to the indoor unit.
• Make a small loop with the cable for easy connec-
tion later.
3. Tape the tubing, drain hose, and the connecting
cable. Be sure that the drain hose is located at the
lowest side of the bundle. Locating at the uper side
can cause drain pan to overflow inside the unit.
If the drain hose is routed inside the room, insulate the
hose with an insulation material* so that dripping from
"sweating"(condensation) will not damage furniture or
floors.
*Foamed polyethylene or equivalent is recommended.
Drain hose
Tape
Connecting
pipe
Drain hose
Connecting cable
Service Manual 19
Flaring Work and Connection of Piping
Drain hose
Connecting
cable
4. Indoor unit installation
Hook the indoor unit onto the upper portion of the
installation plate.(Engage the two hooks of the rear
top of the indoor unit with the upper edge of the
installation plate.) Ensure that the hooks are properly
seated on the installation plate by moving it left and
right.
Press the lower left and right sides of the unit against
the installation plate until the hooks engage into their
slots(clicking sound).
Connecting the piping to the indoor unit and drain
hose to drain pipe.
1. Align the center of the pipes and sufficiently tighten
the flare nut by hand.
Indoor unit tubing Flare nut Pipes
2. Tighten the flare nut with a wrench.
Outside diameter Torque
mm inch kgf.m(lbf-ft)
Ø6.35 1/4 1.8~2.5(13)
Ø9.52 3/8 3.4~4.2(30)
3. When extending the drain hose at the indoor unit,
install the drain pipe.
Wrap the insulation material around the connecting
portion.
1. Overlap the connection pipe insulation material and
the indoor unit pipe insulation material. Bind them
together with vinyl tape so that there may be no gap.
2. Wrap the area which accommodates the rear piping
housing section with vinyl tape.
Wrench
Indoor unit tubing
Drain pipe
Connection pipe
Vinyl tape (wide)
Connecting cable
Open-end wrench (fixed)
Flare nut
Indoor unit drain hose
Adhesive
Plastic bands
Vinyl tape(narrow)
Insulation material
Wrap with vinyl tape
Connection pipe
Indoor unit pipe
3. Bundle the piping and drain hose together by wrapping them with vinyl tape for enough to cover where
they fit into the rear piping housing section.
20 Multi type Air Conditioner
Pipe
Vinyl tape(narrow)
Wrap with vinyl tape
Pipe
Vinyl tape(wide)
Drain hose
For left rear piping
1. Route the indoor tubing and the drain hose to the
required piping hole position.
2. Insert the piping, drain hose, and the connecting
cable into the piping hole.
Insert the connecting cable into the indoor unit.
3.
• Don't connect the cable to the indoor unit.
• Make a small loop with the cable for easy connec-
tion later.
4. Tape the drain hose and the connecting cables.
5. Indoor unit installation
• Hang the indoor unit from the hooks at the top of the
installation plate.
• Insert the spacer etc. between the indoor unit and
the installation plate and separate the bottom of the
indoor unit from the wall.
Flaring Work and Connection of Piping
1 2
Connecting
cable
Drain pipe
Indoor unit
Spacer
Installation plate
8cm
Connecting the piping to the indoor unit and the
drain hose to drain pipe.
1. Align the center of the pipes and sufficiently tighten
the flare nut by hand.
2. Tighten the flare nut with a wrench.
Outside diameter Torque
mm inch kgf.m(lbf-ft)
Ø6.35 1/4 1.8~2.5(13)
Ø9.52 3/8 3.4~4.2(30)
3. When extending the drain hose at the indoor unit,
install the drain pipe.
Indoor unit tubing Flare nut Pipes
Open-end wrench (fixed)
Flare nut
Wrench
Indoor unit tubing
Drain hose
Indoor unit drain hose
Adhesive
Vinyl tape
Connection pipe
(narrow)
Service Manual 21
Flaring Work and Connection of Piping
Plastic bands
Insulation material
Wrap the insulation material around the connecting
portion.
1. Overlap the connection pipe heat insulation and the
indoor unit pipe heat insulation material. Bind them
together with vinyl tape so that there may be no gap.
2. Wrap the area which accommodates the rear piping
housing section with vinyl tape.
3. Bundle the piping and drain hose together by wrapping them with cloth tape over the range within which
they fit into the rear piping housing section.
Connection
pipe
Vinyl tape
(wide)
Connecting cable
Drain hose
Wrap with vinyl tape
Pipe
Vinyl tape(narrow)
Pipe
Vinyl tape(narrow)
Wrap with
vinyl tape(wide)
Indoor
unit piping
Reroute the pipings and the drain hose across the
back of the chassis.
Indoor unit installation
1. Remove the spacer.
2. Ensure that the hooks are properly seated on the
installation plate by moving it left and right.
3. Press the lower left and right sides of the unit against
the installation plate until the hooks engage into their
slots(clicking sound).
Piping for
passage through
piping hole
Connecting
cable
Drain hose
22 Multi type Air Conditioner
REMOTE CONTROL PREPARATION(OPTIONAL)
HOW TO MOUNT ONTO A WALL
HOW TO INSERT BATTERIES
HOW TO INSERT BATTERIES
Remove the battery cover from the remote controller.
• Slide the cover according to the arrow direction.
Insert the two batteries.
• Be sure that the (+) and (-) directions are correct.
• Be sure that both batteries are new.
Re-attach the cover.
• Slide it back into position.
Flaring Work and Connection of Piping
• Do not use rechargeable batteries,
such batteries differ from standard dry
cells in shape, dimensions, and performance.
• Romove the batteries from the remote
controller if the air conditioner is not
going to be used for some long time.
Service Manual 23
Outdoor unit
Flaring Work and Connection of Piping
Outdoor
Align the center of the pipings and sufficiently tighten
the flare nut by hand.
Finally, tighten the flare nut with torque wrench until the
wrench clicks.
• When tightening the flare nut with torque wrench,
ensure the direction for tightening follows the arrow on
the wrench.
Outside diameter Torque
mm inch kgf.m(lbf-ft)
Ø6.35 1/4 1.8~2.5(13)
Ø9.52 3/8 3.4~4.2(30)
A-UNIT
Gas side piping
B-UNIT
Liquid side piping
Torque wrench
24 Multi type Air Conditioner
Flaring Work and Connection of Piping
Air
Conditioner
Main power source
Circuit Breaker
Use a circuit breaker
or time delay fuse.
Connecting the Cable between Indoor Unit and Outdoor Unit
Connect the cable to the Indoor unit.
Connect the cable to the indoor unit by connecting the wires to the terminals on the control board individually according to the outdoor unit connection. (Ensure that the color of the wires of the outdoor unit and the ter-
minal No. are the same as those of the indoor unit.)
The earth wire should be longer than the common wires.
The circuit diagram is not subject to change without notice.
When installing, refer to the electrical diagram behind the front panel of Indoor Unit.
The wiring for the outdoor unit can be found on the inside of the Outdoor Unit control cover.
WARNING:
• The circuit diagram is not subject to change without notice.
• Be sure to connect wires according to the wiring diagram.
• Connect the wires firmly, so that not to be pulled out easily.
• Connect the wires according to color codes by referring to the wiring diagram.
WARNING: Provide a circuit breaker
between power source and the outdoor unit as shown below.
WARNING! : The power wire to the outdoor unit must be of sufficient gauge to meet the
Minimum Circuit Ampacity (MCA) as indicated on the outdoor unit rating plate and be of
type required by NEC and local codes.
AWG14
Line voltage (208~230V)
GN/YL
20mm
The connecting cable between the indoor and outdoor unit should be SJOW type, minimum 18 gauge, and meet requirements of NEC and local codes.
AWG18
WARNING! Secure the interconnecting on both ends by using the clamps provided.
Low voltage (below 40V)
GN/YL
20mm
Service Manual 25
Connecting the Cable between Indoor Unit and Outdoor Unit
NOTICE
Outdoor unit
Over 5mm
Holder for
power supply
cord
Connecting
cable
Cover control
Terminal block
Power supply
cable
Connect the cable to the Outdoor unit.
1. Remove the cover control from the unit by loosening
the screw.
Connect the wires to the terminals on the control
board individually as the following.
2. Secure the cable into the control board with the strain
relief clamp.
3. Refix the cover control to the original position with the
screw.
Outdoor side
A-UNIT
4321
B-UNIT
4321
1. Separately wire the high and low voltage line.
2. Use heat-proof electrical wiring capable of withstanding temperature up to 75°C(167°F).
3. Use outdoor and waterproof connection cable rated more than 300V for the connection between indoor and out-
door unit. (For example, Type SJOW)
• Be sure to comply with local codes while running the wire from the indoor unit to the outdoor
unit(size of wire and wiring method, etc).
• Every wire must be connected firmly.
• No wire should be allowed to touch refrigerant tubing, the compressor or any moving parts.
Power Source
208/230V AC
(High voltage)
:
WARNING:
43214321LN
Terminal BLOCK
Indoor A-UNITIndoor A-UNIT Indoor B-UNITIndoor B-UNIT
26 Multi type Air Conditioner
Connecting the Cable between Indoor Unit and Outdoor Unit
Terminal
block
Hole
(for low voltage line)
Cap(Remove)
Taping
(for sealing)
Lock nut
Low voltage line
(connecting cable)
Power supply line
(1ø, 230/208V)
Conduit panel
Power supply
cable
Connecting cable
Cord clamp
High voltage
Low voltage
Strip 10mm(3/8")
Round
terminal
Loosening the
terminal block screw
Fastening the
wire tightly
Strand wire
Connection method of the connecting cable(Example)
(1) Remove two-caps on the conduit panel.
(for low voltage line)
(2) Pull out connection cable through conduit.
(3) After conduit to the panel, fix nut to the opposite side of
panel
(4) Pass the conneciton cable through the hole
(5) Properly connect the cable on the terminal block
(6) Fix the connection cable with cord clamp provided on the
unit not to have strain at the terminal when the connec-
tion cable is pulled outside up to a 35 pound weight.
WARNING: Loose wiring may cause the
terminal to overheat or result in unit malfunction. A fire hazard may also exist.
Therefore, be sure all wiring is tightly connected.
When connecting each power wire to the corresponding
terminal, follow instructions "How to connect wiring to the
terminals" and fasten the wire tightly with the fixing
screw of the terminal plate.
How to connect wiring to the terminals
For strand wiring
(1) Cut the wire end with a wire cutter or wire-cutting pli-
ers, then strip the insulation to expose the strand
wiring about 10mm(3/8").
(2) Using a screwdriver, remove the terminal screw(s) on
the terminal plate.
(3) Using a round terminal fastener or pliers, securely
clamp each stripped wire end with a round terminal.
(4) Position the round terminal wire, and replace and
tighten the terminal screw using a screwdriver.
Connecting cable
Connecting cable
Service Manual 27
Connecting the Cable between Indoor Unit and Outdoor Unit
Air
Conditioner
Circuit Breaker
Use a circuit
breaker or time
delay fuse.
Main power source
Model
18k 1ø,230/208V 20A
Fuse or breaker
Capacity
Power source
Connecting cable
CAUTION! Provide a circuit breaker between the power source and the outdoor
unit as shown below. Size breaker per the Maximum Fuse or Circuit Breaker (MOC)
rating on the unit rating plate.
Connect the cable to the indoor unit
1. Connect the wires to the terminals on the control
board individually according to the outdoor unit connection.
• Ensure that the color of the wires of outdoor unit
and the terminal No. are the same as those of
indoor unit respectively.
2. Attach the Grille onto the cabinet.
• Grasp the lower left and right side of the Grille and
engage four tabs on the top inside edge of the chassis.
• Press the Grille toward the chassis until it will be
back into place.
28 Multi type Air Conditioner
Checking the Drainage, Forming the Pipings and Long Pipe Setting
Checking the Drainage, Forming the Pipings and Long Pipe Setting
Checking the drainage
To check the drainage.
1. Pour a glass of water on the evaporator.
2. Ensure the water flows through the drain hose of the
indoor unit without any leakage and goes out the
drain exit.
Drain piping
1. The drain hose should point downward for easy drain
flow.
2. Examples of incorrect drain piping.
Accumulated
drain water
Air
Waving
Water
leakage
Water
leakage
Do not raise
Water
leakage
Tip of drain hose
dipped in water
Ditch
Downward slope
Less than
50mm gap
Service Manual 29
Checking the Drainage, Forming the Pipings and Long Pipe Setting
Seal a small opening
around the pipings
with gum type sealant.
Trap
Trap
• Trap is required to prevent water from entering
into electrical parts.
Plastic
band
Taping
Drain hose
Pipings
Connecting
cable
Power supply
cord
Seal a small
opening around
the pipings with
gum type sealer.
Forming the piping
Form the piping by wrapping the connecting portion of the indoor unit with
insulation material and secure it with
two kinds of vinyl tape.
• If you want to connect an additional drain hose, the
end of the drain outlet should be routed above the
ground. Secure the drain hose appropriately.
In cases where the outdoor unit is
installed below the indoor unit perform
the following.
1. Tape the piping, drain hose and connecting cable
from down to up.
2. Secure the tapped piping along the exterior wall
using saddle or equivalent.
In cases where the Outdoor unit is
installed above the Indoor unit perform
the following.
1. Tape the piping and connecting cable from down
to up.
2. Secure the taped piping along the exterior wall.
Form a trap to prevent water entering the room.
3. Fix the piping onto the wall by saddle or equiva-
lent.
30 Multi type Air Conditioner
Air Purging and Evacuation
NOTICE
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Indoor unit
Outdoor unit
Lo Hi
Manifold valve
Pressure
gauge
Air Purging and Evacuation
Air and moisture remaining in the refrigerant system have undesirable effects as indicated below.
1. Pressure in the system rises.
2. Operating current rises.
3. Cooling(or heating) efficiency drops.
4. Moisture in the refrigerant circuit may freeze and block capillary tubing.
5. Water may lead to corrosion of parts in the refrigeration system.
Therefore, the indoor/outdoor unit and connecting tube must be checked for leak tight, and vacuumed to remove
incondensible gas and moisture in the system.
Checking method
Preparation
• Check that each tube(both liquid and gas side tubes)
between the indoor and outdoor units have been properly
connected and all wiring for the test run has been completed. Remove the service valve caps from both the gas and
the liquid side on the outdoor unit. Check that both the liquid and the gas side service valves on the outdoor unit are
kept closed at this stage.
Leakage test
• Connect the manifold valve(with pressure gauges) and dry
nitrogen gas cylinder to this service port with charge
hoses.
CAUTION: Be sure to use a manifold
valve for leak testing.
The high side manifold valve must always
be kept closed.
• Pressurize the system to no more than 150 P.S.I.G.
with dry nitrogen gas and close the cylinder valve
when the gauge reading reached 150 P.S.I.G. Next,
test for leaks with liquid soap.
CAUTION:
To avoid nitrogen entering the
refrigerant system in a liquid state, the top
of the cylinder must be higher than its bottom
when you pressurize the system. Usually, the
cylinder is used in a vertical standing position.
1. Do a leakage test of all joints of the tubing(both
indoor and outdoor) and both gas and liquid side service valves.
Bubbles indicate a leak. Be sure to wipe off the soap
with a clean cloth.
2. After the system is found to be free of leaks, relieve
the nitrogen pressure by loosening the charge hose
connector at the nitrogen cylinder. When the system
pressure is reduced to normal, disconnect the hose
from the cylinder.
:
indoor unit connection set, separately.
Leakage test shoud be done for each
Service Manual 31
Checking the Drainage, Forming the Pipings and Long Pipe Setting
NOTICE
Indoor unit
Outdoor unit
Lo Hi
Manifold valve
Vacuum pump
Pressure
gauge
Open
Close
Evacuation
1. Connect the charge hose end described in the preceding steps to the vacuum pump to evacuate the
tubing and indoor unit.
Confirm the "Lo" knob of the manifold valve is open.
Then, run the vacuum pump.
The operation time for evacuation varies with tubing
length and capacity of the pump.
[Each Room] The vacuum pump must be operated
less than 0.8torr of the gage pressure.
2. When the desired vacuum is reached, close the "Lo"
knob of the manifold valve and stop the vacuum
pump.
Finishing the job
1. With a service valve wrench, turn the valve stem of
liquid side valve counter-clockwise to fully open the
valve.
2. Turn the valve stem of gas side valve counter-clockwise to fully open the valve.
3. Loosen the charge hose connected to the gas side
service port slightly to release the pressure, then
remove the hose.
4. Replace the flare nut and its bonnet on the gas side
service port and fasten the flare nut securely with an
adjustable wrench. This process is very important to
prevent leakage from the system.
5. Replace the valve caps at both gas and liquid side
service valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready for test running.
: Repeat evacuation procedure for each indoor
unit.
32 Multi type Air Conditioner
Charging
Charging
■ Each outdoor unit is factory charged (nameplate charge) for the evaporator as well as a 7.5m(25ft) line set for
each indoor line.
Any time total line set is used either shorter or longer then the nominal 15m(50ft) line set length the refrigerant
charge has to be adjusted.
■ Whether the line set is made shorter or longer you must adjust the charge based on how many ft of tubing are
either added or removed based on 20g/m(0.22oz/ft) of R-410A per meter(foot).
Max total length
Capacity (Btu/h)
18k 30m(100ft) 15m(50ft) 5m(16ft) 7.5m(25ft) 7.5m(25ft) 20g/m(0.22oz/ft)
of all pipes
(A+B)
Max length of
each pipe (A/B)
Min length of
each pipe (A/B)
Max Elevation
between each indoor
unit and outdoor unit
(h1)
Max elevation
between indoor
units (h2)
Additional
Refrigerant
Example: A 75ft line set is used for dual - zone 25 additional ft X 0.22 ounces per foot= add 5.5 ounces of R-
410A
Important:(Unit is critically charge)
If you are ever uncertain of the unit charge, reclaim, evacuate and weigh in the correct charge using the unit nameplate charge adjusting for line sets longer or shorter than 7.5m(25ft) for each indoor unit.
Service Manual 33
Test Running
NOTICE
NOTICE
Discharge
temperature
Discharge air
Intake temperature
Test Running
1. Check that all tubing and wiring have been properly connected.
2. Check that the gas and liquid side service valves are fully open.
Prepare remote control
Remove the battery cover by pulling it according to the
arrow direction.
Insert new batteries making sure that the (+) and (–) of
battery are installed correctly.
Reattach the cover by pushing it back into position.
:
• Use 2 AAA(1.5volt) batteries. Do not use rechargeable
batteries.
• Remove the batteries from the remote control if the system is not going to be used for a long time.
Evaluation of the performance
Operate all indoor units for 15~20 minutes, then check
the system refrigerant charge:
1.Measure the pressure of one of the gas side service
valves.
2. Measure the temperature of the intake and discharge
of air.
3. Ensure the difference between the intake temperature
and the discharge is more than 8°C(14.4°F).
4. For reference, the gas side pressure of optimum condi-
tion is as below.(Cooling)
Refrigerant
R-410A 35°C (95°F) 8.5~9.5kg/cm2G(120~135 P.S.I.G.)
Outside ambient
TEMP.
The pressure of the gas side
service valve.
Bolt
Tubing connection
:
If the actual pressure are higher than shown, the
system is most likely over-charged, and charge should be
removed. If the actual pressure are lower than shown, the system is most likely undercharged, and charge should be added.
Important:
❏ Individual zones should be all in the same
operation mode (Heating or Cooling mode)
34 Multi type Air Conditioner
Operation
Function of control
1. MAIN UNIT FUNCTION
• DISPLAY
Operation Indicator
• On while in appliance operation, off while in appliance pause
• Flashing while in disconnection or short in Thermistor (3 sec off / 0.5 sec on)
Sleep Timer Indicator
• On while in sleep timer mode, off when sleep timer cancel or appliance operation pause
Timer Indicator
• On while in timer mode (on/off), off when timer mode is completed or canceled
Defrost Indicator
• Off except when hot start during heating mode operation or while in defrost control
Operation
■ Cooling Mode Operation
• When the intake air temperature reaches 0.5°C(0.9
fan stop.
• When it reaches 0.5°C(0.9
Compressor ON Temp ➲ Setting Temp+0.5°C(0.9
Compressor OFF Temp ➲ Setting Temp-0.5°C(0.9
• While in compressor running, operating with the airflow speed set by the remote control. While compressor is
off fan operates at low speed regardless of the setting.
°F)
above the setting temp, they start to operate again.
°F)
below the setting temp, the compressor and the outdoor
°F)
°F)
■ Soft Dry Operation Mode
• When the dehumidification operation input by the remote control is received, the intake air temperature is
detected and the setting temp is automatically set according to the intake air temperature.
26°C(78.8
24°C(75.2
18°C(64.4
Intake Air Temp<18°C(64.4
• While compressor off, the indoor fan repeats low airflow speed and stop.
• While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehumidification
operation and 4-min compressor off repeat.
Compressor ON Temp. ➲ Setting Temp+0.5°C(0.9
Compressor OFF Temp. ➲ Setting Temp-0.5°C(0.9
• In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.
°F)
≤ Intake Air Temp ➲ 25°C(77
°F)
≤ Intake Intake Air Temp<26°C(78.8
°F)
≤ Intake Intake Air Temp<24°C(75.2
°F)
°F)
°F)
➲ Intake Air Temp-1°C(30.2
➲ Intake Air Temp-0.5°C(31.1
➲ 18°C(64.4
°F)
°F)
°F)
°F)
°F)
°F)
■ Heating Mode Operation
• When the intake air temp reaches +3°(37.4
below the setting temp, the compressor is turned on.
Compressor ON Temp. ➲ Setting Temp.
Compressor OFF Temp. ➲ Setting Temp.+3°C(37.4
• While compressor on, the indoor fan is off when the indoor pipe temp. is below 20°C(68
°F)
27°C(80.6
, it operates with the low or setting speed. When the indoor pipe temp is between 20°C(68
°F)
…above the setting temp, the compressor is turned off. When
°F)
°F)
, when above
°F)
and
Service Manual 35
Operation
27°C(80.6
• While compressor off, the indoor fan is off when the indoor pipe temp is below 33°C(91.4
35°C(95
• While in defrost control, the indoor is outdoor fans are turned off.
°F)
, it operates with Super-Low(while in sleep mode, with the medium airflow speed).
°F)
, it operates with the low airflow speed.
°F)
, when above
■ Defrost Control(Heating)
• Defrost operation is controlled by timer and sensing temperature of outdoor pipe.
• The first defrost starts only when the outdoor pipe temperature falls below -6°C(21.2
passed from starting of heating operation and more than 4 minutes operation of compressor.
• Defrost ends after 12 minutes passed from starting of defrost operation when the outdoor pipe temperature
rises over 15°C(59
• The second defrost starts only when the outdoor pipe temperature falls below -6°C(21.2
passed from ending of the first defrost and more than 4 minutes operation of compressor.
°F)
even before 12 minutes.
°F)
after 35 minutes
°F)
after 35 minutes
■ Fuzzy Operation
• When any of operation mode is not selected like the moment of the power on or when 3 hrs has passed since
the operation off, the operation mode is selected.
• When determining the operation mode, the compressor, the outdoor fan, and the 4 way valve are off and only
the indoor fan is operated for 15 seconds. Then an operation mode is selected according to the intake air
temp at that moment as follows.
24°C(75.2
21°C(69.8
Intake Air Temp<21°C(69.8
• If any of the operation modes among cooling / dehumidification / heating mode operations is carried out for 10
sec or longer before Fuzzy operation, the mode before Fuzzy operation is operated.
°F)
≤ Intake Air Temp ➲ Fuzzy Operation for Cooling
°F)
≤ Intake Air Temp<24°C(75.2
°F)
°F)
➲ Fuzzy Operation for Dehumidification
➲ Fuzzy Operation for Heating
1) Fuzzy Operation for Cooling
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C(0.9
below the setting temp, the compressor is turned off. When 0.5°C(0.9
compressor is turned on.
Compressor ON Temp ➲ Setting Temp +0.5°C(0.9
Compressor OFF Temp ➲ Setting Temp + 0.5°C(0.9
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
26°C(78.8
24°C(75.2
22°C(71.6
18°C(64.4
Intake Air Temp<18°C(64.4
• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature
automatically according to the Fuzzy rule.
• While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature.
°F)
≤ Intake Air Temp ➲ 25°C(77
°F)
≤ Intake Air Temp<26°C(78.8
°F)
≤ Intake Air Temp<24°C(75.2
°F)
≤ Intake Air Temp<22°C(71.6
°F)
°F)
°F)
°F)
➲ Intake Air Temp + 1°C(1.8
➲ Intake Air Temp + 0.5°C(0.9
➲ Intake Air Temp
➲ 18°C(64.4
°F)
°F)
°F)
°F)
°F)
or more above the setting temp, the
°F)
°F)
°F)
or more
36 Multi type Air Conditioner
Operation
2) Fuzzy Operation for Dehumidification
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C(0.9
below the setting temp, the compressor is turned off. When 0.5°C(0.9
compressor is turned on.
Compressor ON Temp ➲ Setting Temp + 0.5°C(0.9
Compressor OFF Temp ➲ Setting Temp+0.5°C(0.9
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
26°C(78.8
24°C(75.2
22°C(71.6
18°C(64.4
Intake Air Temp<18°C(64.4
• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature
automatically according to the Fuzzy rule.
• While in Fuzzy operation, the airflow speed of the indoor fan repeats the low airflow speed or pause as in
dehumidification operation.
3) Fuzzy Operation for Heating
°F)
≤ Intake Air Temp ➲ 25°C(77
°F)
≤ Intake Air Temp<26°C(78.8
°F)
≤ Intake Air Temp<24°C(75.2
°F)
≤ Intake Air Temp<22°C(71.6
°F)
°F)
°F)
°F)
➲ Intake Air Temp+1°C(1.8
➲ Intake Air Temp+0.5°C(0.9
➲ Intake Air Temp
➲ 18°C(64.4
°F)
°F)
°F)
°F)
°F)
or more above the setting temp, the
°F)
°F)
°F)
or more
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 3°C(37.4
above the setting temp, the compressor is turned off. When below the setting temp, the compressor is turned
on.
Compressor ON Temp ➲ Setting Temp
Compressor OFF Temp ➲ Setting Temp + 3°C(5.4
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
20°C(68
Intake Air Temp<20°C(68
• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature
automatically according to the Fuzzy rule.
• While in Fuzzy operation, the airflow speed of the indoor fan is set to the high or the medium according to the
intake air temperature and the setting temperature.
°F)
≤Intake Air Temp ➲ Intake Air Temp + 0.5°C(0.9
°F)
➲ 20°C(68
°F)
°F)
°F)
°F)
or more
■ Airflow Speed Selection
• The airflow speed of the indoor fan is set to high, medium, low, or power (auto) by the input of the airflow
speed selection key on the remote control.
■ On-Timer Operation
• When the set time is reached after the time is input by the remote control, the appliance starts to operate.
• The timer LED is on when the on-timer is input. It is off when the time set by the timer is reached.
• If the appliance is operating at the time set by the timer, the operation continues.
While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature.
■ Off-Timer Operation
• When the set time is reached after the time is input by the remote control, the appliance stops operating.
• The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached.
Service Manual 37
Operation
• If the appliance is on pause at the time set by the timer, the pause continues.
■ Off-Timer <=> On-Timer Operation
• When the set time is reached after the on/off time is input by the remote control, the on/off-timer operation is
carried out according to the set time.
■ Sleep Timer Operation
• When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appliance operation, the operation of the appliance stops.
• While the appliance is on pause, the sleep timer mode cannot be input.
• While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature
increases by 1°C(33.8
• When the sleep timer mode is input while in cooling cycle mode, the airflow speed of the indoor fan is set to
the low.
• When the sleep timer mode is input while in heating cycle mode, the airflow speed of the indoor fan is set to
the medium.
°F)
. After another 30 min elapse, it increases by 1°C(1.8
°F)
again.
■ Chaos Swing Mode
• By the Chaos Swing key input, the upper/lower vane automatically operates with the Chaos Swing or they are
fixed to the desired direction.
• While in Chaos Swing mode, the angles of cooling and heating cycle operations are different.
■ Chaos Natural Wind Mode
• When the Chaos Natural Wind mode is selected and then operated, the high, medium, or low speed of the airflow mode is operated for 2~15 sec. randomly by the Chaos Simulation.
■ Jet Cool Mode Operation
• While in heating mode or Fuzzy operation, the Jet Cool key cannot be input. When it is input while in the
other mode operation (cooling, dehumidification, ventilation), the Jet Cool mode is operated.
• In the Jet Cool mode, the indoor fan is operated at super-high speed for 30 min at cooling mode operation.
• In the Jet Cool mode operation, the room temperature is controlled to the setting temperature, 18°C(64.4
• When the sleep timer mode is input while in the Jet Cool mode operation, the Jet Cool mode has the priority.
• When the Jet Cool key is input, the upper/lower vanes are reset to those of the initial cooling mode and then
operated in order that the air outflow could reach further.
■ Auto Restarting Operation
• When the power is restored after a sudden power failure while in appliance operation, the mode before the
power failure is kept on the memory and the appliance automatically operates in the mode on the memory.
°F)
.
38 Multi type Air Conditioner
Operation
■ Forced Operation
• To operate the appliance by force in case that the remote control is lost, the forced operation selection switch
is on the main unit of the appliance to operate the appliance in the standard conditions.
• When the power is supplied while the slide switch is on the forced operation position, or when the slide switch
position is switched to the Auto Restarting (or test operation) position or switched from the remote control
position to the forced operation position while the power is on, the forced operation is carried out.
• When the slide switch position is switched from the forced operation position to the Auto Restarting position or
the remote control position, the forced operation is canceled and the appliance stops operating.
• In the forced operation mode, the indoor fan is operated at low speed for around 15 sec and then the operation condition is set according to the intake air temperature as follows.
24°C(43.2
21°C(37.8
Intake Air Temp<21°C(37.8
°F)
≤Intake Air Temp ➲ Cooling Mode Operation, 22°C(39.6
°F)
≤Intake Air Temp<24°C(43.2
°F)
°F)
➲ Dehumidification Operation, 23°C(41.4
➲ Heating Mode Operation, 24°C(43.2
°F)
, High Speed
°F)
, High Speed
°F)
, High Speed
■ Buzzer Sounding Operation
• When the appliance-operation key is input by the remote control, the short "beep-beep-" sounds.
• When the appliance-pause key is input by the remote control, the long "beep—" sounds.
Service Manual 39
Operation
On/Off : Lights up during the system operation.
Sleep Mode : Lights up during Sleep Mode Auto operation.
Timer : Lights up during Timer operation.
Defrost Mode
Outdoor unit
operation
: Lights up during Defrost Mode or Hot Start operation (Heat pump model only)
: Lights up during outdoor unit operation.(Cooling model only)
Desire temperature For cooling,dehumidification,heating modes it display Destired temperature
indicator • Cooling : 18°C~30°C(64°F~86°F) • AI : Auto Operation
• Dehumidification : 18°C~30°C(64°F~86°F) • Po : Jet Cool
• Heating : 16~30°C(60°F~86°F) • Lo : Test Mode
Plasma
: The function illustrates its dynamic mode by using a multiple lighting system. (Optional)
• Room temperature sensor. (THERMISTOR)
• Maintains the room temperature in accordance with the Setting Temp.
• Indoor fan is delayed for 5 seconds at the starting.
• Restarting is delayed for approx. 3 minutes.
• High, Med, Low, Chaos, Jet Cool
• Intermittent operation of fan at low speed.
• The fan is switched to low(Cooling), med(Heating) speed.
• The unit will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.
• The fan is switched to intermittent or irregular operation
•
The fan speed is automatically switched from high to low speed.
• The louver can be set at the desired position or swing
up and down automatically.(Model base)
Split Type
Indoor Unit
Operation ON/OFF by Remote controlle
r
Sensing the Room Temperature
Room temperature control
Starting Current Control
Time Delay Safety Control
Indoor Fan Speed Control
Operation indication Lamps (LED)
Soft Dry Operation Mode
• Both the indoor and outdoor fan
stops during deicing.
• Hot start after deice ends.
• The indoor fan stops until the
evaporator piping temperature will
be reached at 27°C(80.6°F).
Sleep Mode Auto Control
Natural Air Control by CHAOS Logic
* Airflow Direction Control
Deice (defrost) control (Heating)
Hot-start Control (Heating)
Function of Indoor Unit
"Wall Mounted Type is standard"
* Functions is dependent on model type.
40 Multi type Air Conditioner
Function of Outdoor Unit
Outdoor Unit
Operating Step
LEV Control
Out door Fan Control
• Compressor step varies considering condition such as room temp,outdoor temp, operating room
number,Temp gap between room temp and set temp and so on.
• LEV pulse is modulated to keep constant superheat or subcooling.
• Outdoor fan operates at High or Off to respond to the load condition.
R/Valve Control(Heating Model Only)
• Convert R/Valve to change cooling to heating, heating to cooling.
Defrost Function
• After 45 min heating operation, check the defrost condition and if outdoor pipe temp is below -
5°C(23°F) and released from deice operation in case outdoor pipe temp is over 12°C(53.6°F) or 9 min
cooing mode.
•
To deice outdoor heat exchanger in low temp condtion, convert operating mode from heating to cooling mode.
Oil Return System
• In single(one) comp operation duration, another comp will operate for 30 seconds every 1 hours.
Comp Overload Protection
• To protect comp from being overload, protector will turn off the comp.
High Pressure Protction
• If cycle pressure is too high(around 36.7 kgf/cm2), it will turn off comp A
Operation
Service Manual 41
Operation
ON
OFF
CANCEL
AUTO CLEAN
°C/°F
SET
Cooling Operation
Auto Operation
Healthy Dehumidification Operation
Flip-up door
(opened)
Heating Operation
Signal transmitter
•
Cooling Model( ), Heat Pump Model( )
5
1
3
10
9
16
17
12
18
15
6
4
2
7
11
8
13
14
Operation Mode
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
17
18
15
(Heat Pump)
(Cooling Only)
Remote Control Operation
The Remote Controller transmits the signals to the system.
START/STOP BUTTON
Operation starts when this button is pressed and stops when
the button is pressed again.
OPERATION MODE SELECTION BUTTON
Used to select the operation mode.
ROOM TEMPERATURE
SETTING BUTTONS
Used to select the room temperature.
INDOOR FAN SPEED SELECTOR
Used to select fan speed in four steps
low, medium, high and CHAOS.
JET COOL
Used to start or stop the speed cooling/heating.
(Speed cooling/heating operates super high fan speed.)
CHAOS SWING BUTTON
Used to stop or start louver movement and set the desired
up/down airflow direction.
ON/OFF TIMER BUTTONS
Used to set the time of starting and stopping operation.
TIME SETTING BUTTONS
Used to adjust the time.
TIMER SET/CANCEL BUTTON
Used to set the timer when the desired time is obtained and to cancel
the Timer operation.
SLEEP MODE AUTO BUTTON
Used to set Sleep Mode Auto operation.
AIR CIRCULATION BUTTON
Used to circulate the room air without cooling or heating.
ROOM TEMPERATURE CHECKING BUTTON
Used to check the room temperature.
PLASMA(OPTIONAL)
Used to start or stop the plasma-purification function.
RESET BUTTON
Initialize remote controller.
2nd F Button
Used prior to using modes printed in blue at the bottom of buttons.
AUTO CLEAN
Used to set Auto Clean mode.
˚C TO ˚F SWITCHING BUTTON
Used to switch temperature reading from Centigrade to Fahrenheit.
42 Multi type Air Conditioner
HORIZONTAL AIRFLOW DIRECTION CONTROL BUTTON (NOT ON
ALL MODELS)
Used to set the desired horizontal airflow direction.
Disassembly
Earth
Conductor
Indoor Unit
Split Type Indoor Unit
Disconnect the unit from power supply before making any checks.
Be sure the power switch is set to “OFF”.
To remove the Grille from the Chassis.
• Set the up-and-down air discharge louver to open
position (horizontally) by finger pressure.
• Remove the securing screws.
• To remove the Grille, pull the lower left and right
side of the grille toward you (slightly tilted) and lift it
straight upward.
Disassembly
1. Before removing the control box, be sure to
take out the wire screwed at the other end.
Service Manual 43
Disassembly
Screw
2. To remove the Control Box.
• Remove securing screws.
• Pull the control box out from the chassis
carefully.
3. To remove the Discharge Grille.
• Unhook the discharge grille and pull the
discharge grille out from the chassis carefully.
4. To remove the Evaporator.
• Remove 3 screws securing the evaporator(at the
left 2EA in the Eva Holder, at the right 1EA).
• When repair, do not damage the Caution label.
44 Multi type Air Conditioner
• Unhook the tab on the right inside of the chassis
Motor cover
Bearing
Cross-flow fan
at the same time, slightly pull the evaporator
toward you until the tab is clear of the slot.
5. To remove the Motor Cover
• Remove 2 securing screw.
• Pull the motor cover out from the chassis
carefully.
Disassembly
6. To remove the Cross-Flow Fan
• Loosen the screw securing the cross-flow fan to
the fan motor (do not remove).
• Lift up the right side of the cross-flow fan and the
fan motor, separate the fan motor from the
cross-flow fan.
• Remove the left end of the cross-flow fan from
the self-aligning bearing.
Service Manual 45
Schematic Diagram
Schematic Diagram
Electronic Control Device
1. Indoor Unit
1) Split Type
46 Multi type Air Conditioner
2. Outdoor Unit
P07
SW01F
OR2H,OR7H,OR10H:91K,OR3H-4H,OR8H-9H,OR11H-12H:15K(ETC:20K)
R03T
11
DC 5V
56K
R04T
1K
1
2
7036P
IC01A
CN-JIG
3
4
3
4
22
JIG_RX
JIG_TX
DC 5V
10K
R01T
1K
R02T
C01H-C04H : 103
P21
21
JIG_RX
26
OSC01B
CST-8.00MGW
JIG_TX
+
3
C02A
10
R03A,100
50V
25V
0.01
C01A
R02A,4.7K
R01A,1K
Xin
Vss
Xout
R01B,1M
25
24
P22
RESET
23
22
P20
19
R01F,1K
R02F,10K
R02G,10K
R01G,10K
R04G,10K
R03G,10K
P32
29
30
P33
28
27
P31
P30
L4(C)
L3(C)
L1(A)
L2(B)
PWM(A)
PWM(C)
PWM(B)
P53
P54
46
47
P52
45
51
P60
50
P62
P63
P61
52
53
31
P37
343536
P41
P40
33
32
P36
P35
RX(C)
RX(B)
TX(C)
RX(A)
TX(B)
14
13
P13
P12
P34
111012
P10
P11
TX(A)
CN-LEV(C)
CN-LEV(B)
DC 5V
+
C52M
220
50V
231
231
5
4
5
4
IC03M
44
220
50V
+
C51M
1 132
3
2
50V
55
1
+
220
C50M
1
22
11
OUT_PIPE
OUT_TH
22
33
44
CN-TH2
SUCTION
33
44
DC 5V
R05H-R20H
(ETC: 12.1K 1%)
(R05H,R06H,R07H:6.2K 1%)
DISCHARGE
CN-TH1
11
41
R01H,1K
60
P71
P66
P65
P64
555654
P70
P67
59
57
63
P73
P72
R04H,1K
62
61
P76
P74
P75
R02H,1K
R03H,1K
1
64
7 8 9
P05
P06
5
6
P02
P04
P03
P51
44 4 3
P00
P01
42
43
P47
P50
MICOM
TMP87CM41F
58
TEST
P77
20
2
VSS
AVDD
49
48
VDD
Q01Z
KRA107M
39
40
P44
P46
P45
38
37
P42
P43
DC 5V
CN-LEV(A)
IC02M
423
423
5 5
RY-COMP(A)
RY-FAN(H)
RY-COMP(B)
IC01M
R01Z-R07Z : 4.7K
RY-LIQ
RY-FAN(L)
RY-GAS
RY-4WAY
DC 15V
Schematic Diagram
Service Manual 47
Schematic Diagram
CN-COM1
COM(A)
HOTGAS
LIQUID
4WAY
1
1
1
1
1
1
NF04M
NF05M
COM(B)
3
314
DC15V
CN-COM3
324
1
4
324
COM(C)
DC15V
Vm(B)
Vm(C)
CN-COM2
412
231
412
231
Vm(A)
DC15V
FANHI
FANLOW
CN-FAN
1
1
1
1
NF01M
NF02M
NF03M
COMPB
43
RY-COMP(B)
COMPA
43
RY-COMP(A)
LIVE1
LIVE2
1
33
1
FUSE
250V/T5A
ZNR01J
INR14D471K
SVC561D-14A
NEUTRAL
CN-POWER
DC0V
NC
NC
3
6
5
PC201
C101
S/WTRANS5
D101
OUT
DC15V
11 2
D
D201
OUT
12
12uH
L01D
IC04D
7805
DC5V
222K
C33M
68K
R35M
+
8
FB
BP
C102
268
TNY
S
PC201
D202
R201
R202
7
9
+
+
103
50V
C06D
103
50V
C07D
+
10V
C03D
220uF
1KV
3W
D06M
ERB-44-08
84
C30M
821K
C29M
1KV
63V
680uF
C28M
100V
473K
C27M
10K
R32M
2
GND
GND
C01D
C02D
C32M
6
472/250V
uRM1515-2B
u-POWERMODULE
C10D
102M
35V
1000UF
25V
470uF
30,1W
R37M
51.1K
2
S/WTRANS6
Q08M
2SD2220
100K
R33M
3
R101
34K
7
6
14
3K 5.23K39.2K 13K
20K
1
8
9
10K
R04S
22
20 20
35.7K
3
2
2
1
6.04K
21.5K
4.3K
7
4.7K
PWM(C)
4
5
6
1%
R27M
R26M
10.2K
+
C24M
561*2
302
D01J
1uF
C03J
ZNR01J~ZNR02J
1mH
NF01J
1uF
C04J
1M
R01J
472*3
C05J
9mH
C06J~C07J
NF02J
1uF
C08J
222*2
C09J~C10J
200
R36M
ZD03M
12V
MT15V
Q09M
7
Vm(C)
94
3
R34M
1.5K103K
100V
C31M
51.1K
R31M
220
23.2K
8.06K
2.94K
R29M,2K,1%
4
100uF
25V
C26M
+
51.1K
5
R28M
13K
1%
1
51.1K
9.1k
100V
C25M
102
1%
100uf
MT15V
R17M,2K,1%
RY-FAN(H)
D01D
1N4937
C04D
470UF
L02D
12uH
103
C08D
R19M
220
C15M
100uF
+
R16M
13K
C14M
102
DC310V
1
IN
R102
GND
13
+
35V
2K
R02D
1/2W
50V
+
35V
C05D
220uF
MT15V
Vm(B)
L12M
L11M
FMX12S
D05M
L10M
L09M
IC06M
51.1K
25V
1%
100V
DC5V
KRA101M
Q07M
COM(B)
COM(A)
10K
20
R07K
R05K
1
8
2
3
IC01K
10K
R02K
1K1K
R13K
1K
R09K
R01K
TX(A)
DC5V
DC15V
DC310V
BD01M
D15XB60
330UF
C12M
S/WTRANS1
L03M
L04M
D01M
FMX12S
L02M
L01M
450V
4
10K
R04K
1K
R03K
NTC
11 2
10K
R06K
DKS-10D-22
+
C11M
R10M
6
5
8
4
7
C01K
RX(A)
1KV
222K
3W
68K
C06M
C05M+63V
C04M
R07M
8
R11K
10K
R08K
IC02K
102
DC0V
1/2W
560K
R11M
C10M
D02M
ERB-44-08
6
84
C07M
472/250V
821K
1KV
680uF
473K
100V
10K
2
IC04M
14
3K 5.23K39.2K 13K
20K
8
9
R04S
20 20
35.7K
3
2
1
6.04K
21.5K
4.3K
DC5V
7
R01M
KRA101M
Q01M
10.2K
4.7K
PWM(A)
COM(C)
10K
20TX(B)
6
1
5
4
8
8
7
2
3
1K
R10K
RX(B)
30,1W
R13M
51.1K
2
S/WTRANS2
Q02M
2SD2220
R08M
100K
10K
20
R12K
R16K
R15K
6
1
5
4
8
8
4
4
7
2
3
IC03K
102
C02K
1K
102
C03K
R14K
RX(C)
TX(C)
200
R12M
ZD01M
12V
MT15V
Q03M
7
Vm(A)
94
3
1.5K103K
R09M
100V
C09M
3
51.1K
R06M
34K
7
6
1
10K
22
2
4
5
220
23.2K
8.06K
2.94K
R04M,2K,1%
4
100uF
25V
C03M
+
51.1K
5
R03M
13K
1%
1
51.1K
100V
C02M
102
6
R02M
9.1k
1%
1%
+
100uf
C01M
RY-4WAY
R25M
1KV
C22M
D04M
ERB-44-08
6
84
C19M
472/250V
C18M
821K
1KV
63V
C17M
680uF
C16M
100V
473K
10K
R20M
2
14
20K
8
9
20
R04S
20
35.7K
3
2
1
6.04K
10.2K
R14M
30,1W
200
R24M
51.1K
12V
ZD02M
Q06M
94
2
3 7
S/WTRANS4
R22MC21M
1.5K103K
100V
Q05M
2SD2220
R21M
100K
3
34K
23.2K
8.06K
7
6
2.94K
4
1
51.1K
5
22 10K
1
51.1K
2
4
5
6
1%
R15MC13M+1%
100uf 9.1k
C23M
222K
R23M3W68K
11 2
S/WTRANS3
L08M
L07M
FMX12S
D03M
L06M
L05M
+
8
IC05M
3K 5.23K39.2K 13K
21.5K
4.3K
DC5V
7
Q04M
KRA101M
4.7K
PWM(B)
RY-FAN(L)
RY-GAS
RY-LIQ
48 Multi type Air Conditioner
Service Manual 49
1. Room Type Indoor Unit
Wiring Diagram
Schematic Diagram
2. Outdoor Unit
Schematic Diagram
PCB :6870A90409B
ASSY:6871A20771
6871A20782
Components Locations
1. Indoor Unit
MAIN P.C.B ASM
1) Split Type
• TOP VIEW
• BOTTOM VIEW
50 Multi type Air Conditioner
2. Display ASSEMBLY
1) Split Type (6871A20682A)
Schematic Diagram
Service Manual 51
Schematic Diagram
3. Outdoor Unit
1) Component side
52 Multi type Air Conditioner
2) Solder side
Schematic Diagram
Service Manual 53
Troubleshooting Guide
Troubleshooting Guide
Refrigeration Cycle Diagram
Th2
Th5
Th1
Th3
Th4
Th6
Indoor
Ø 9.52
Ø 9.52
Ø 6.35
Ø 6.35
EEV
EEV
Outdoor
High
Pressure
S/W
C/V1C/V2
Th7 Th8
A
c
c
B
Comp
Th9
A
Comp
Refrigerent Flow
Cooling
Heating
LOC. Description PCB Connector
Th1 Thermistor for evaporating temperature CN-TH2(Indoor)
Th2 Thermistor for indoor air temperature CN-TH1(Indoor)
Th3 Thermistor for evaporating temperature CN-TH1(Indoor)
Th4 Thermistor for evaporating temperature CN-TH2(Indoor)
Th5 Thermistor for indoor air temperature CN-TH1(Indoor)
Th6 Thermistor for evaporating temperature CN-TH1(Indoor)
Th7 Thermistor for Discharge temperature CN-TH1(Outdoor)
Th8 Thermistor for Discharge temperature CN-TH1(Outdoor)
Th9 Thermistor for outdoor air temperature CN-TH2(Outdoor)
Th10 Thermistor for Condensing temperature CN-TH2(Outdoor)
54 Multi type Air Conditioner
Th10
Strainer
Troubleshooting Guide
LED1
LED2
Self-diagnosis Function
■ Error Indicator
• The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.
• Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
• If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed.
• After error occurrence, if error is released, error LED is also released simultaneously.
• To operate again on the occurrence of error code, be sure to turn off the power and then turn on.
• Having or not of error code is different from Model.
* Error Code
Error code Description MPS Variable LED1 LED2 Indoor Status
(1 digit) (10 digit)
00 No Error ON
01 Indoor Room Thermistor Error 1 time OFF
02 Indoor In-Piping Error 2 times OFF
05 Communication Error between In and Out 5 times OFF
06 Indoor Out-Piping Error 6 times OFF
07 Differnt mode operation 7 times OFF
10 Indoor fan motor locked error 1 times OFF
33 D-Pipe High(Normal) 3 times 3 times OFF
44 Outdoor Air Thermistor Error(Open/Short) 4 times 4 times OFF
45 Cond Pipe Thermistor Error(Open/Short) 5 times 4 times OFF
47
51 Capcity Error(High/Low) 1 times 5 times OFF
Const. D-Pipe Thermistor Error(Open/Short)
7 times 4 times OFF
Service Manual 55
Troubleshooting Guide
Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air, and operating current.
Temp. difference : approx. 0°C(0°F)
Current : less than 80% of
rated current
Temp. Difference
Temp. difference : approx. 8°C
Current : less than 80% of
rated current
Operating Current
Temp. difference : less than 8°C
Current : near the rated cur-
rent
Temp. difference : over 8°C
Notice:
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relatively higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
(14.4°F)
(14.4°F)
(14.4°F)
All amount of refrigerant leaked out.
Check refrigeration cycle.
Refrigerant leakage
Clog of refrigeration cycle
Defective compressor
Excessive amount of refrigerant
Normal
2. Check temperature and pressure of refrigeration cycle.
Suction pressure Temperature
(Compared with (Compared with Cause of Trouble Description
the normal value) the normal value)
High Defective compressor Current is low.
Higher
Normal Excessive amount of High pressure does not quickly
refrigerant rise at the beginning of operation.
Insufficient amount of Current is low.
Lower Higher refrigerant(Leakage)
Clogging
Notice:
1. The suction pressure is usually 4.5~6.0 kg/cm2G at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
56 Multi type Air Conditioner
Electronic Parts Troubleshooting Guide
❇ Refer to electronic contorol device drawing & schematic diagram.
Troubleshooting Guide
Trouble 1
Check the voltage of power(AC208V/AC230V, 60Hz).
• The voltage of main power.
• The voltage applied to the unit.
• The connecting method of Indoor/Outdoor connecting cable (each color)
• The P.W.B. Ass'y
(Fuse, Noise Filter, Power Transformer, IC01D, IC02D, etc.)
The Product doesn’t operate at all.
Turn off the main power and wait until LED on outdoor PCB is off.
Turn on the main power again.
Does "Beeping" sound is made from the indoor unit?
NO
YES
• Primarily, the operating condition of Micom is O.K.
• Check CN-DISP1
The operation check of the P.C.B. Ass'y
Procedure
1) The input voltage of power transformer.
2) The output voltage of power
transformer.
3) IC01D(7812)
4) IC02D(7805)
5) IC01A(KIA7036)
Specification
1) AC230V ± 30V
: Check the rated voltage
2) 15V ± 1.5V
3) DC12V
4) DC5V
5) The voltage of micom pin 29
: DC4.5V↑
Remedy
1) Replace
power transfomer.
2) Replace
power transfomer.
3) Replace IC01D.
4) Replace IC02D.
5) Replace IC01A.
Service Manual 57
Troubleshooting Guide
Trouble 2
(When operated in the Sleeping Mode, the wind speed is set to the low speed as force.)
Caused by the remote controller.
Product doesn't operate with the remote controller.
Turn on main power.
While the compressor has been stopped, the compressor does not operate
owing to the delaying function for 3 minutes after stopped.
When the compressor stopped Indoor Fan is driven by a low speed.
At this point the wind speed is not controlled by the remote controller.
Caused by other parts except
the remote controller
When the mark ( ) is displayed in LCD
screen, replace battery.
When the detect switch (double key) inside the
remote controller door is fault, it is impossible to
operate temperature regulating(▲ / ▼) and wind
speed selecting.
Check the Display PWB Ass'y • Check receiver ass'y
Check the contact of CN-DISP 1 connector
Check DISP PWB Ass'y
-Voltage between CN1 ➀ - ➆ : DC +5V
58 Multi type Air Conditioner
Troubleshooting Guide
Trouble 3
Operate Cooling Mode by setting the disired temperature of the remote controller is less
than one of the Indoor temperature by 1°C at least.
Check the sensor for Indoor temperature is attatched as close as to be effected by the
themperature of Heat Exchange (EVA.)
When the sensor circuit for Indoor temperature and connector are in bad connection or are
not engaged, Compressor/Outdoor fan is stopped.
The Compressor/Outdoor Fan are don't operate
Turn on the main power.
When in air circulation mode, compressor/outdoor fan is stopped.
• Check the related circuit of R01H(1K), R02H(1K), R03H(1K), R04H(1K), Micom(pin No. 74 ,
75 , 76 , 77 ).
• Check the Indoor temperature sensor is disconnected or not (about 10K at 25°C).
Check the Relay(RY-PWR, RY-START) for driving Compressor.
• Check the voltage between brown and blue cable of terminal to connect the Outdoor
(About AC208V / 230V).
• Check the related circuit of relay in Outdoor PCB Ass'y.
Check Point
Between Micom(No. 50,51) and
GND
Between IC01M(No. 10) and
GND
Comp. ON Comp. OFF
DC 5V DC 0V
DC 12VDC 1V↓
Turn off main power.
Check the electrical wiring diagram of Outdoor side.
Check the open or short of connecting wires between Indoor and Outdoor.
Service Manual 59
Troubleshooting Guide
Trouble 4
When indoor Fan does not operate.
When indoor Fan does not operate.
Does the voltage of each terminals of CN-MOTOR CONNECTOR in
Indoor unit corresponds to values in the Table of page 69
Does the voltage of terminal of CN-DC/DC CONNECTOR in
Indoor unit corresponds to the values in the table of page 56
Do the voltage of terminal of
CN-DC/DC CONNECTOR in
Outdoor unit corresponds to the
values in the table of page 56
NO
Check the patterns and the
conditions of outdoor unit
PWB Assy's.
Check the pattern and the
condition of Indoor unit PWB
Ass'y.
YES
Check the connecting condition and disconnection of
connecting wires between
Indoor and Outdoor unit.
Check connecting condition of the CN-MOTOR CONNECTOR
Check the interference of Indoor Fan.
Check the motor of Indoor Fan
Indoor Fan may be stopped in the Soft Dry Mode(change to the Cooling Operation Mode).
Indoor Fan is to be stopped when Indoor pipe(coil) termperature is lower than 79°F.
(At that times, Defrost indicator is turned on)
60 Multi type Air Conditioner
Troubleshooting Guide
Trouble 5
When the louver does not operate.
When Vertical Louver does not operate.
• Confirm that the Vertical Louver is normally geared with the shaft of
Stepping Motor.
• If the regular torque is detected when rotating the Vertical Louver with
hands Normal
• Check the connecting condition of CN-UP/DOWN Connector
• Check the soldering condition(on PWB) of CN-UP/DOWN Connector
Check the operating circuit of the Vertical Louver
• Confirm that there is DC +12V between pin (RED) of CN-UP/DOWN and
GND.
• Confirm that there is a soldering short at following terminals.
- Between 60 , 61 , 62 and 63 of MICOM
- Between
- Between 12 , 13 ,
- Between
2 , 3 , 4 and 5 of IC01M
14 , 15
of IC01M
1 , 2 , 3 , 4 and 5 of CN-UP/DOWN
If there are no problems after above checks
• Confirm the assembly conditions that are catching and interfering parts in
the rotation radial of the Vertical Louver
Service Manual 61
Troubleshooting Guide
Error Code
■ Trouble Shooting
Error
code
01 Indoor air sensor
02 Indoor inlet pipe sensor
06 Indoor outlet pipe sensor
Title Cause of error Check point & Normal condition
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
10KΩ
Ω
Normal resistor : 10KΩ / at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Normal resistor : 5KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Normal resistor : 5KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
2.5Vdc
V
Check the resistance / voltage
❑ Check Point
1. Unplug the sensor on Indoor unit PCB.
2. Estimate the resistance of each sensor
3. If the resistance of the sensor is 10KΩ/5KΩ at 25°C(77°F), then sensor is normal
4. If the resistance of the sensor is 0 KΩ or ∞, then sensor is abnormal. ➔ Change the sensor.
5. Plug the sensor on Indoor unit PCB and Power ON.
6. Estimate the voltage of each sensor.
7. If the voltage of the sensor is 2.5Vdc / at 25°C(77°F), then sensor is normal.
8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ➔ Repair or Change the PCB
62 Multi type Air Conditioner
Troubleshooting Guide
Error
code
05 / 53
Communication
(Indoor ➔ Outdoor)
Title Cause of error Check point & Normal condition
• Power input AC 230V.(Outdoor, Indoor)
• The connector for transmission is disconnected.
• The connecting wires are misconnected.
• Communication poorly
• The GND 1,2 is not connected at main GND.
• The communication line is shorted at GND.
• Transmission circuit of outdoor PCB is abnormal.
• Transmission circuit of indoor PCB is abnormal.
❑ Check Point
1. Check the input power AC 230V.(Outdoor, Indoor)
2. Check the communication wires are correctly connected.
➔ Adjust the connection of wire
➔ Confirm the wire of "Live", "Neutral".
3. Check the resistance between communication line and GND.(Normal : Over 2MΩ)
4. Check the connector for communication is correctly connected.
5. Check the connection of GND1, GND2, and main GND.
6. If one indoor unit is operated normally, outdoor PCB is no problem.
➔ Check the another indoor unit.
* CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit.
Service Manual 63
Troubleshooting Guide
Error
code
33 D-Pipe Temp. High
Title Cause of error Check point & Normal condition
115°C(239°F)
100°C(212°F)
95°C(203°F)
❑ Check Point
1. Check the install condition for over load.
2. Check the SVC V/V open.
3. Check the leakage of refrigerent.
4. Check the constant compressor.
• Discharge sensor
temp. high
COMP OFF
LEV OPEN(16PULSE/MIN)
LEV OPEN(10PULSE/MIN)
NORMAL
• Check the discharge pipe sensor.
• Check the install condition for over load.
• Check the leakage of refrigerent.
• Check the SVC V/V open.
Error
code
51 Capacitor error
Title Cause of error Check point & Normal condition
❑ Check Point
1. Check the indoor unit capacity.
2. Check the combination table.
★ In the tropical model case
➔ single cycle has no error for over capacity.
• Over Capacitor combination
• Check the indoor unit capacity.
• Check the combination table
64 Multi type Air Conditioner
Troubleshooting Guide
Error
code
44 Outdoor air sensor
45 Condensor pipe sensor
47 D-Pipe sensor
Title Cause of error Check point & Normal condition
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
Ω
Ω
Normal resistor : 10KΩ / at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Normal resistor : 5KΩ/ at 25°C
Normal voltage : 2.5Vdc / at 25°C
Normal resistor : 200KΩ/ at 25°C
Normal voltage : 4.5Vdc / at 25°C
(77°F)
(77°F)
(77°F)
(77°F)
(Unplugged)
(plugged)
(Unplugged)
(plugged)
Check the resistance
❑ Check Point
1. Estimate the resistance of each sensor.(Unplugged)
2. Estimate the voltage of each sensor.(Plugged)
3. If the resistance is 0V or 5Vdc, then sensor is abnormal
Service Manual 65
2-way, 3-way Valve
Flare nut
To
piping
connection
Open position
Closed position
Flare nut
Valve cap
To
piping
connection
Open position
Closed position
Hexagonal wrench
(4mm)
To outdoor unit
Pin
Service
port
Service
port cap
To outdoor unit
2-way, 3-way Valve
2-way Valve (Liguid Side) 3-way Valve (Gas Side)
Works Shaft position Shaft position Service port
Shipping Closed Closed Closed
(with valve cap) (with valve cap) (with cap)
Air purging Open Closed Open
(Installation) (counter-clockwise) (clockwise) (push-pin or with
1.
vacuum pump)
Operation Open Open Closed
(with valve cap) (with valve cap) (with cap)
Pumping down Closed Open Open
2.
(Transfering) (clockwise) (counter-clockwise) (connected
Evacuation Open Open Open
3.
4.
(Servicing) (with charging
cylinder)
Gas charging Open Open Open
(Servicing) (with charging
cylinder)
manifold gauge)
Pressure check Open Open Open
5.
6.
(Servicing) (with charging
Gas releasing Open Open Open
(Servicing) (with charging
66 Multi type Air Conditioner
cylinder)
cylinder)
(1) Pumping down
Indoor unit
Outdoor unit
Liquid side
Close
Gas side
2-Way
valve
Open
3-Way
valve
manifold gauge
Indoor unit
Liquid side
Close
Gas side
2-Way
valve
Open
3-Way
valve
Hi- handle
(CLOSE)
Lowhandle
(CLOSE)
2-way, 3-way Valve
• Procedure
1. Confirm that both the gas side and liquid side
valves are set to the open position.
- Remove the valve stem caps and confirm that the
valve stems are in the raised position.
- Be sure to use a hexagonal wrench to operate
the valve stems.
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then connect the manifold gauge to the service port of the
gas side valve.
- Connect the hose of the gauge with the push pin
to the service port.
4. Air purging of the charge hose.
- Open the Low-handle valve on the gauge
slightly to air purge from the hose.
6. Operate the air conditioner at the cooling cycle
and stop it when the gauge indicates 1kg/cm2g.
7. Immediately set the gas side valve to the closed
position.
- Do this quickly so that the gauge ends up indicating 1kg/ g.
8. Disconnect the charge set, and mount the liquid
side and gas side valve caps and the service port
nut.
- Use torque wrench to tighten the service port nut to
a torque of 1.8kg.m.(156.2 lbf·in) [4.2kg.m (364.5
lbf·in)/5.5kg.m (477.4 lbf·in)]
- Be sure to check for gas leakage.
5. Set the liquid side valve to the closed position.
• Be sure to short pressure S/W. otherwise Low pressure S/W detect low pressure skete and stops the compressor.
Service Manual 67
2-way, 3-way Valve
Indoor unit
Outdoor unit
Liquid side
Open
Gas side
2-Way
valve
Open
3-Way
valve
manifold gauge
Indoor unit
Liquid side
Open
Gas side
2-Way
valve
Open
3-Way
valve
Vacuum pump
Hi- handle
(OPEN)
Lowhandle
(OPEN)
(2) Evacuation
(All amount of refrigerant leaked)
• Procedure
1. Confirm that both the liguid side valve and gas
side valve are set to the opened position.
2. Connect the vaccum pump to the center hose of
the manifold gauge.
3. Connect the service port of the gas side valve to
the low side of the gauge.
4. Evacuation for approximately one hour.
- Confirm that the gauge needle has moved
toward-76 cmHg (vacuum of 4 mmHg or less).
5. Close the Low handle of the gauge turn off the
vacuum pump, and confirm that the gauge needle
does not move(approximately 5 minutes after
turning off the vacuum pump).
68 Multi type Air Conditioner
6. Disconnect the charge hose from the vacuum
pump.
- Vacuum pump oil.
If the vacuum pump oil becomes dirty or depleted,replenish as needed.
7. Mount the valve caps and the service port caps.
(3) Gas Charging
manifold gauge
Charging
cylinder
Hi- handle
(OPEN)
Low-handle
(OPEN)
Check valve
Indoor unit
Outdoor unit
Liquid side
Open
Gas side
2-Way
valve
Open
3-Way
valve
Indoor unit
Liquid side
Open
Gas side
2-Way
valve
Open
3-Way
valve
(After Evacuation)
2-way, 3-way Valve
• Procedure
1. Connect the gauge to the charging cylinder.
- Connect the charge hose which you disconnected from the vacuum pump to the valve at the
bottom of the cylinder.
- If you are using a gas cylinder, also use a scale
and reverse the cylinder so that the system can
be charged with liquid.
2. Purge the air from the charge hose.
-
Open the valve at the bottom of the cylinder and
press the check valve on the charge set to purge
the air. (Be careful of the liquid refrigerant). The
procedure is the same if using a gas cylinder.
3. Open the low handle on the gauge and charge
the system with liquid refrigerant.
- If the system can not be charged with the speci-
fied amount of refrigerant, it can be charged
with a little at a time (approximately 150g each
time) while operating the air conditioner in the
cooling cycle; however, one time is not sufficient, wait approximately 1 minute and then
repeat the procedure(pumping down-pin).
4. Immediately disconnect the charge hose from
the gas side valve's service port.
This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.
- Stopping partway will allow the gas to be dis-
charged.
- If the system has been charged with liquid
refrigerant while operating the air conditioner
turn off the air conditioner before disconnecting
the hose.
5. Mount the valve stem nuts and the service port
nut.
- Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.(4.2kg.m/5.5kg.m.)
- Be sure to check for gas leakage.
Service Manual 69
70 Multi type Air Conditioner
Exploded View & Replacement Parts List
Exploded View & Replacement Parts List
Model: A-DMH18DB-1
435300
137213-2
567480-4
552112
554031
137213-1
552113
W0CZZ-1
268711-6
561410-1
552116
435511-2
W0CZZ-2
435511-1
649950
552202
566000
H/P switch
561411-1
268711-4
552114
567480-5
Discharge
561411-2
548490
552113-1
554160-1
554160-2
552201
552203-1
552203-2
552203-1
552203-2
430411
435512
447910
546810
349600
559010
435301
437211
Service Manual 71
Exploded View & Replacement Parts List
437211 PANEL ASSEMBLY,FRONT 3721A23001A R
137213-1 PANEL ASSEMBLY,SIDE 1A00201D R
137213-2 PANEL ASSEMBLY,SIDE 3A02284M R
435300 GRILLE,REAR 1A00207B R
435301 GRILLE,DISCHARGE 3530A20007B R
435512 COVER ASSEMBLY, TOP 3H03266L R
430410 BASE ASSEMBLY,OUTDOOR 3041AP2741G R
554031 CONDENSER, ASSEMBLY, BENDING 5403A20072L R
546810 MOTOR,UNCLASSIFIED 4681A20008E R
559010 FAN ASSSEMBLY,PROPELLER 1A00195B R
554160-1 COMPRESSORSET,KOREA(LEFT) 2520UGAK2AA(GK113KAA) R
554160-2 COMPRESSORSET,KOREA(RIGHT) 2520UGJK2AA(GK094KAA) R
447910 BARRIER ASSEMBLY,OUTDOOR 4791A30004K R
649950 CASE ASSEMBLY,CONTROL(OUTDOOR) ABQ34008701 R
268711-4 PCB ASSEMBLY,SUB 6871A20500B R
268711-6 PCB ASSEMBLY,MAIN 6871A20479G R
435511-2 COVER ASSEMBLY,CONTROL 3550AR2886C R
435511-1 PANEL SIDE 3720AR7035C R
WOCZZ-1 CAPACITOR,FILM BOX 2A00986G R
W0CZZ-2 CAPACITOR,FILM BOX 6120AR2194F R
548490 ACCUMULATOR ASSEMBLY AAB33905201 R
561410-1 SOLENOID(COIL ASSEMBLY,REVERSE) 3A02028Z R
561411-1 DRAWING ASSEMBLY(EEV COIL) 6877A200050A R
561411-2 DRAWING ASSEMBLY(EEV COIL) 6877A20050B R
552203-1 VALVE SERVICE(Ø9.52) 5220A20001K R
552203-2 VALVE SERVICE(Ø6.35) 2H02479J R
566000 SWITHCH PRESSURE 6600L000013 R
567480-5 THEMISTOR,NTC 6323A20023A R
567480-4 THEMISTOR,NTC 6323A20001N R
552113 TUBE ASSEMBLY CONDENSER(OUT) AJR33485101 R
552112 TUBE ASSEMBLY CONDENSER(IN) AJR33484101 R
552116 TUBE ASSEMBLY,REVERSE AJR33477701 R
552114 TUBE ASSEMBLY,DISCHARGE(OUTDOOR) AJR33477801 R
349600 MOTOR BRACKET 4960AP1361A R
552113-1 TUBE ASSEMBLY, CONDENSER(OUT) 5211A20927F R
552201 CHECK VALVE 5220A30004A R
552202 REVERSING VALVE 5220AR3228R R
A-DMH18DB-1
LOCATION
No.
DESCRIPTION
Part No.
SVC
CODE
Part List (A-DMH18DB-1)
72 Multi type Air Conditioner
Exploded View & Replacement Parts List
Indoor Unit
135301
152302-2
152313
152302-1
342800
567480-1
567480-3
359011
131410 733010
135316
135303
135311
147581
268711-1
146811
346810
135516
35211B
354210-1
249951
352150
268711-3
268711
267110
135500
Inlet air + Eva in Eva out
B-DMH18DB-1
Parts List (B-DMH18DB-1)
Exploded View & Replacement Parts List
LOCATION
No.
131410 CHASSIS ASSEMBLY 3141A20019C R
135316 GRILLE ASSEMBLY,FRONT(INDOOR) 3531A23004L R
135301 GRILLE,FRONT 3531A10339C R
152302-1 FILTER,AIR 5230A20051B R
152302-2 FILTER,AIR 5230A20051D R
135311 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A11307E R
147581 LOUVER,HORIZONTAL 5990A20069A R
146811 MOTOR,DC 4681A20055A R
268711-1 PCB ASSEMBLY,DISPLAY 6871A20682A R
135516 COVER ASSEMBLY,MOTOR 3551A20156B R
346810 MOTOR,DC 4681AR2295L R
152313 FILTER ASSEMBLY,DEODORIZER 5231A20040A R
249951 CASE ASSEMBLY,CONTROL(INDOOR) 4995A20831A R
268711-3 PCB ASSEMBLY,MAIN 6871A20782A R
268711 PCB ASSEMBLY(OPTION PCB) 6871A20989A R
567480-3 THERMISTOR,NTC 6323AQ3226T R
567480-1 THERMISTOR,NTC 6323A20004A R
267110 REMOTE CONTROLLER ASSEMBLY 6711A20128L R
342800 BEARING 4280A20004A R
35211B TUBE ASSEMBLY,TUBING 5211A21363E R
352150 HOSE ASSEMBLY,DRAIN 5251A20011B R
359011 FAN ASSEMBLY,CROSS FLOW 5901A20017F R
733010 PLATE ASSEMBLY,INSTALLATION 3301A20020C R
135500 COVER 3550A30262A R
354210-1 EVAPORATOR ASSEMBLY,FIRST 5421A20218B R
135303 GRILLE, INLET 3530A10255A R
DESCRIPTION
PART No.
B-DMH18DB-1
CODE
SVC
Service Manual 73
Specifications and performance data subject to change without notice.
HEAT CONTROLLER, INC.
1900 WELLWORTH AVENUE • JACKSON, MICHIGAN 49203
THE QUALITY LEADER IN CONDITIONING AIR
P/No.:3828A20390W
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