Wall Mounted
Multi-Split System
Air Conditioning/Heat Pump
DMC24DB-1
DMH24DB-1
Before servicing the unit, read the
“safety precautions” in this manual.
Only for authorized service personnel.
HEAT CONTROLLER, INC.
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
DMC24DB-1...........................................................................................................................................12
DMH24DB-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
2 Multi type Air Conditioner
Service Manual 3
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
12
12 12
12
24
12000
12000-12000
12000
24000
12000
24000
3516
7033
3516
7033
12000
12000-12000
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 24k Btu/h
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.
NOTICE
Symbols Used in this Manual
Combination table
Combination table
4 Multi type Air Conditioner
Safety Precautions
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.
■ Meanings of symbols used in this manual are as shown below.
WARNING
CAUTION
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
WARNING
■ Installation
Be sure not to do.
Be sure to follow the instruction.
Do not use a defective or underrated circuit breaker. Use this
appliance on a dedicated circuit.
• 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 ground the product.
• 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.
Always install a dedicated circuit and breaker.
• Improper wiring or installation may
cause fire or electric shock
Use the correctly rated breaker or fuse.
• There is risk of fire or electric
shock.
Service Manual 5
Safety Precautions
Do not install, remove, or reinstall the unit by yourself
(customer).
• There is risk of fire, electric shock,
explosion, or injury.
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.
For installation, always contact the dealer or an
Authorized Service Center.
• 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 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.
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.
Do not use the product in a
tightly closed space for a long
time.
• Oxygen deficiency could occur.
Gasolin
6 Multi type Air Conditioner
Safety Precautions
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.
When the product is soaked
(flooded or submerged), contact
an Authorized Service Center.
• There is risk of fire 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.
Turn the main power off when cleaning or
maintaining the product.
• There is risk of electric shock.
When flammable gas leaks,
turn off the gas and open a
window for ventilation before
turn the product on.
• Do not use the telephone or turn
switches on or off. There is risk of
explosion or fire
If strange sounds, or smoke
comes from product. Turn the
breaker off.
• There is risk of electric shock or
fire.
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.
Service Manual 7
Safety Precautions
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.
Take care to ensure that nobody could step on
or fall onto the outdoor unit.
• This could result in personal injury and product damage.
Always check for gas (refrigerant) leakage after installation or repair of product.
• Low refrigerant levels may cause
failure of product.
Install the drain hose to ensure that
water is drained away properly.
• A bad connection may cause water
leakage.
Keep level even when
installing the product.
• To avoid vibration or water leakage.
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.
Use two or more people to lift
and transport the product.
• Avoid personal injury.
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.
CAUTION
■ Installation
90°
8 Multi type Air Conditioner
Safety Precautions
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.
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 block the inlet or outlet
of air flow.
• It may cause product failure.
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 touch the metal parts of
the product when removing the
air filter. They are very sharp!
• There is risk of personal injury.
Do not step on or put anyting
on the product. (outdoor
units)
• There is risk of personal injury and
failure of product.
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.
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.
■ Operational
Thinner
Wax
Service Manual 9
Safety Precautions
Do not recharge or disassemble the batteries.
Do not dispose of batteries in a fire.
• They may burn or explode.
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.
Use a firm stool or ladder when cleaning or
maintaining the product.
• Be careful and avoid personal injury.
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
10 Multi type Air Conditioner
Dimensions
Dimensions
Indoor Unit
Split Type Indoor
Installation plate
D
H
W
W mm(in) 895(35.2)
H mm(in) 282(11.1)
D mm(in) 165(6.5)
Model
Dimension
Split Type(SE)
12 kBtu/h
Service Manual 11
Outdoor Unit
W
D
L1
L2
L4
L3
H
L7L5L6
W mm(in) 870(34.3)
H mm(in) 800(31.5)
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)
UE1
24kBtu/h
MODEL
DIM
Dimensions
12 Multi type Air Conditioner
Product Specifications
Product Specifications
DMC24DB-1
23,600/24,000 11,800/12,000 208/230V
--
2.4(0.085) 1.2(0.042) at 230V
1Ø, 208/230V, 60Hz
Indoor – 9.4(331.9)
Outdoor 53(1871.8)
Indoor – 36/32/29
at 230V
Outdoor 54
2,390/2,390 1,420/1,420
--
10.1/10.1 6.3/6.3
208/230V
--
9.9/10.1 8.3/8.5
-Indoor 895 x 282 x 165(35.2x11.1x6.5)
Outdoor 870 x 800 x 320(34.2x31.5x12.6)
Indoor 9.5
Outdoor 69
Liquid 6.35(1/4)
Gas 9.52(3/8)
1,600(3.5) – at 7.5m
O
L.C.D Wireless
O
O
Operation
2-Unit On
1-Unit On
Remarks
Unit
Item
Cooling Capacity
Heating Capacity
Moisture Removal
ℓ/h(ft3/h)
Power Source ø, V, Hz
Air Circulation
m3/min(ft3/min)
Noise Level dB(A)
Input W
A
E.E.R. Btu/h.w
C.O.P. -
Dimensions(W x H x D)
mm(in)
Net. Weight kg(lb)
Service Valve mm(In)
Refrigerant(R-410A) g(lb)
Airflow Direction Control(Up & Down)
Remote Controller Type
Sleeping Operation
Drain Hose
Cooling
Heating
Cooling
Heating
Cooling
Heating
Runnig
Current
Btu/h
( Hi / Med / Low )
Service Manual 13
Product Specifications
DMH24DB-1
23,600/24,000 11,800/12,000 208/230V
23,600/24,000 11,800/12,000
2.4(0.085) 1.2(0.042) at 230V
1Ø, 208/230V, 60Hz
Indoor – 9.4(331.9)
Outdoor 53
Indoor – 36/32/29
at 230V
Outdoor 54
2,390/2,390 1,420/1,420
2,440/2,440 1,620/1,620
10.1/10.1 6.3/6.3
208/230V
9.8/9.8 7.2/7.2
9.9/10.1 8.3/8.5
2.83/2.88 2.13/2.17
Indoor 895 x 282 x 165(35.2x11.1x6.5)
Outdoor 870 x 800 x 320(34.2x31.5x12.6)
Indoor 9.5
Outdoor 69
Liquid 6.35(1/4)
Gas 9.52(3/8)
1,600(3.5) – at 7.5m
O
L.C.D Wireless
O
O
Operation
2-Unit On
1-Unit On
Remarks
Unit
Item
Cooling Capacity
Heating Capacity
Moisture Removal ℓ/h(ft
3
/h)
Power Source ø, V, Hz
Air Circulation m
3
/min(ft3/min)
Noise Level dB(A)
Input W
A
E.E.R. Btu/h.w
C.O.P. -
Dimensions(W x H x D)
mm(in)
Net. Weight kg(lb)
Service Valve mm(In)
Refrigerant(R-410A) g(lb)
Airflow Direction Control(Up & Down)
Remote Controller Type
Sleeping Operation
Drain Hose
Cooling
Heating
Cooling
Heating
Cooling
Heating
Runnig
Current
Btu/h
( Hi / Med / Low )
14 Multi type Air Conditioner
Installation
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 Parts
Installation Tools
Read carefully, and then follow step by step.
Service Manual 15
Installation
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.
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.
5.
Select a place so that the warm air and sound from
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.
Select the best location
More than 5cm
(2.0 inch)
More than 5cm
(2.0 inch)
More than 2.3m
(90.6 inch)
More than 5cm
(2.0 inch)
CAUTION: Install the indoor unit
on the wall where the height from
the floors more than 2.3m(7.5ft).
more than 20cm
(7.9 inch)
more than 20cm
(7.9 inch)
more than 70cm
(27.6 inch)
16 Multi type Air Conditioner
Installation
Multi Piping Type
Piping length and elevation
24k 30m(100ft) 15m(50ft) 3m(10ft) 7.5m(25ft) 7.5m(25ft)
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-
door unit (h1)
Max elevation
between indoor
units (h2)
B
h1
A
B
h1
CAUTION: Capacity is based on standard length and maximum allowance length is on the
basis of reliability. Oil trap should be installed every 5~7 meters (16.4~23.0ft).
12K 3/8" 1/4" 7.5m(25ft) 20g/m(0.32oz/ft)
Gas Liquid Standard Length Additional Refrigerant
Indoor Capacity
(Btu/h)
Pipe Size
24k
Service Manual 17
Installation
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.
Fixing Installation Plate(Standard Type)
Installation Plate
Type "A" screw
Chassis
Hook
ABCD
SE 65 110 85 110
CHASSIS
(Grade)
Distance (mm)
D
C
Ø70mm
Left rear piping Right rear piping
Installation plate
B
A
Ø70mm
18 Multi type Air Conditioner
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.
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 die in the dimension shown in the
table above.
Copper
pipe
90°
Slanted Uneven Rough
mm inch mm
Ø6.35 1/4 0~0.5
Ø9.52 3/8 0~0.5
Outside diameter A
Bar
Copper pipe
Clamp handle
Red arrow mark
Cone
Yoke
Handle
Bar
"A"
Flaring Work and Connection of Piping
Point down
Pipe
Reamer
Flare nut
Copper tube
Service Manual 19
Flaring Work and Connection of Piping
Check
1. Compare the flared work with the figure by.
2. If a flared section is defective, cut it off and do flaring work
again.
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 by)
and pull the tubing and drain hose away from chassis.
3. Replace only the plastic tubing holder 1, not the holder 2 in
the original position.
1. Route the indoor tubing and the drain hose in the direction
of rear right.
2.
Insert the connecting cable into the indoor unit from the outdoor unit through the piping hole.
• Do not connect the cable to the indoor unit.
•
Make a small loop with the cable for easy connection 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.
Inclined
Inside is shiny without scratches
Smooth all round
Even length
all round
Surface
damaged
Cracked Uneven
thickness
= Improper flaring =
Connecting the Piping
For right rear piping
Drain hose
Tape
Connecting
pipe
Drain hose
Connecting cable
20 Multi type Air Conditioner
Flaring Work and Connection of Piping
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.
2. Tighten the flare nut with a wrench.
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.
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.
Drain hose
Connecting
cable
mm inch kg.m lbf.in
Ø6.35 1/4 1.8 156.2
Ø9.52 3/8 4.2 364.5
Outside diameter Torque
Indoor unit tubing Flare nut Pipes
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
Vinyl tape(narrow)
Connection pipe
Indoor unit pipe
Pipe
Wrap with vinyl tape
Pipe
Vinyl tape(wide)
Drain hose
Service Manual 21
Flaring Work and Connection of 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.
3.
Insert the connecting cable into the indoor unit.
• Don't connect the cable to the indoor unit.
• Make a small loop with the cable for easy connection
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.
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.
3. When extending the drain hose at the indoor unit, install
the drain pipe.
For left rear piping
mm inch kg.m lbf.in
Ø6.35 1/4 1.8 156.2
Ø9.52 3/8 4.2 364.5
Outside diameter Torque
1 2
Connecting
cable
Drain pipe
Indoor unit
Spacer
Installation plate
8cm
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)
22 Multi type Air Conditioner
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 hous-
ing 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.
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 installa-
tion 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).
Flaring Work and Connection of Piping
Plastic bands
Insulation material
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
Piping for
passage through
piping hole
Connecting
cable
Drain hose
Service Manual 23
Flaring Work and Connection of Piping
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.
REMOTE CONTROL PREPARATION(OPTIONAL)
HOW TO MOUNT ONTO A WALL
HOW TO INSERT BATTERIES
• 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.
HOW TO INSERT BATTERIES
24 Multi type Air Conditioner
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.
Liquid side piping
Torque wrench
B-UNIT
A-UNIT
Gas side piping
Outdoor unit
Outside diameter Torque
mm inch kg.m lbf.in
Ø6.35 1/4 1.8 156.2
Ø9.52 3/8 4.2 364.5
Flaring Work and Connection of Piping
Service Manual 25
Flaring Work and Connection of Piping
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 terminal 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.
Connect the cable to the Indoor unit.
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 cord connected to the outdoor unit should be complied with the following speci-
fications (ETL recognized and CSA certified).
The power connecting cable connected to the indoor and outdoor unit should be complied with the following specifications
(ETL recognized and CSA certified).
Air
Conditioner
Main power source
Circuit Breaker
Use a circuit breaker
or time delay fuse.
WARNING:
When using the separate wire as the power cord, please fix the separate wire into the con-
trol box panel by using tie wrap as the fixture.
Connecting the Cable between Indoor Unit and Outdoor Unit
Line voltage (208~230V)
GN/YL
20mm
Wire gauge per
MCA on unit name plate
and local and national code.
AWG18
Low voltage (below 40V)
GN/YL
20mm
26 Multi type Air Conditioner
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 onto the control board with the holder
(clamper).
3. Refix the cover control to the original position with the
screw.
:
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 outdoor unit.
(For example, Type SJOW)
WARNING:
• 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.
NOTICE
Outdoor unit
Over 5mm
Holder for
power supply
cord
Connecting
cable
Cover control
Terminal block
Power supply
cable
Connecting cable(Low voltage)
Connecting the Cable between Indoor Unit and Outdoor Unit
24k Outdoor side
A-UNIT
Terminal BLOCK
Indoor A-UNIT
4321
Connecting cable(Low voltage)
Connecting cable(Low voltage)
LN
4321
Power Source
208/230V AC
(High voltage)
B-UNIT
4321
4321
Terminal BLOCK
Indoor B-UNIT
Service Manual 27
Connecting the Cable between Indoor Unit and Outdoor Unit
(1) Remove two-caps on the conduit panel.
(2) Make a hole appropriate for the passage of connection cable
through on cap by tool.
(for low voltage line)
(3) Pass the connecting cable through the hole.
(4) Properly connect the cable on the terminal block.
(5) Fix the connection cable with cord clamp provided on the unit
not to have strain at the terminal when the connection cable is
pulled outside up to a 35 pound weight.
(6) Wind the vinyl tape round the connecting cable for sealing
between the surface of the connection cable and cap.
(7)Finally, Fix the cap to the conduit panel.
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 pliers,
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.
Connection method of the connecting cable(Example)
G
Terminal
block
Lock nut
Power supply line
(1ø, 230/208V)
Conduit panel
Cap(Reuse)
Cord clamp
Hole
(for low voltage line)
Cap(Remove)
Taping
(for sealing)
Low voltage line
(connecting cable)
High voltage
Low voltage
Strip 10mm(3/8")
Round
terminal
Connecting cable
Loosening the
terminal block
screw
Fastening the
wire tightly
Strand wire
28 Multi type Air Conditioner
Connect the cable to the indoor unit
CAUTION: Provide a circuit breaker between power source and the unit as shown
below.
Air
Conditioner
Circuit Breaker
Use a circuit
breaker or time
delay fuse.
Main power source
Model
24k 1Ø, 230/208V
Per max. fuse size
on unit name plate
Power source
Fuse or breaker
Capacity
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.
Connecting cable
Connecting the Cable between Indoor Unit and Outdoor Unit
Service Manual 29
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. Do not make drain piping.
Checking the Drainage, Forming the Pipings and Long Pipe Setting
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
30 Multi type Air Conditioner
Checking the Drainage, Forming the Pipings and Long Pipe Setting
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 equivalent.
Seal a small opening
around the pipings
with gum type sealer.
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.
Service Manual 31
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.
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.
:
Leakage test shoud be done for each indoor
unit connection set, separately.
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.
NOTICE
Checking method
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
Indoor unit
Outdoor unit
Lo Hi
Manifold valve
Pressure
gauge
Air Purging and Evacuation
32 Multi type Air Conditioner
Checking the Drainage, Forming the Pipings and Long Pipe Setting
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. The following table shows the
time required for evacuation.
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.
NOTICE
Required time for evacuation when 4 CFM vacuum
pump is used
10 min. or more 15 min. or more
If tubing length is less
than 10m (33 ft)
If tubing length is longer
than 10m (33 ft)
Indoor unit
Outdoor unit
Lo Hi
Manifold valve
Vacuum pump
Pressure
gauge
Open
Close
Evacuation
Service Manual 33
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 22.5m(75ft: for tri-zone) 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(0.22oz) of R-410A per meter(foot).
Example: A 80ft line set is used for dual - zone 5 additional ft X 0.22 ounces per foot= add 1.1 ounces of R-410A
Important:
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. Unit is critically charged.
24k 30m(100ft) 15m(50ft) 3m(10ft) 7.5m(25ft) 7.5m(25ft) 20g/m(0.22oz/ft)
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 outdoor unit
(h1)
Max elevation
between indoor
units (h2)
Additional
Refrigerant
Charging
34 Multi type Air Conditioner
1. Check that all tubing and wiring have been properly connected.
2. Check that the gas and liquid side service valves are
fully open.
1) Prepare remote controller
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.
NOTE:
• Use 2 AAA(1.5volt) batteries. Do not use rechargeable
batteries.
• Remove the batteries from the remote controller if the sys-
tem is not going to be used for a long time.
2) Precautions in test run
■ The initial power supply must provide at least 90% of
the rated voltage.
Otherwise, the air conditioner should not be operated.
■ For test run, carry out the cooling operation firstly
even during heating season. If heating operation is
carried out firstly, it leads to the trouble of compressor. Then attention must be paid.
■ Carry out the test run more than 5 minutes without
fail. (Test run will be cancelled 18 minutes later automatically)
■ The test run is started by pressing timer cancel button
five times continuously. (Room type)
■ To cancel the test run, press any button.
3) Settlement of outdoor unit
■ Anchor the outdoor unit with a bolt and nut(ø10mm)
tightly and horizontally on a concrete or rigid mount.
■ When installing on the wall, roof or rooftop, anchor the
mounting base securely with a nail or wire assuming the
influence of wind and earthquake.
■ In the case when the vibration of the unit is conveyed to
the hose, secure the unit with an anti-vibration rubber.
4) Evaluation of the performance
Operate unit for 15~20 minutes, then check the system
refrigerant charge:
1. Measure the pressure of the gas side service valve.
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) (Cooling) or
reversely (Heating).
Bolt
Tubing connection
Test Running
Split Type
Discharge
temperature
Discharge air
Intake temperature
R-410A 35°C (95°F) 8.5~9.5kg/cm2G(120~135 P.S.I.G.)
Outside ambient
TEMP.
Refrigerant
The pressure of the gas side
service valve.
Test Running
Service Manual 35
Operation
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
■ Cooling Mode Operation
• When the intake air temperature reaches 0.5°C(0.9
°F)
below the setting temp, the compressor and the outdoor
fan stop.
• When it reaches 0.5°C(0.9
°F)
above the setting temp, they start to operate again.
Compressor ON Temp ➲ Setting Temp+0.5°C(0.9
°F)
Compressor OFF Temp ➲ Setting Temp-0.5°C(0.9
°F)
• 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.
■ 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
°F)
≤ Intake Air Temp ➲ 25°C(77
°F)
24°C(75.2
°F)
≤ Intake Intake Air Temp<26°C(78.8
°F)
➲ Intake Air Temp-1°C(30.2
°F)
18°C(64.4
°F)
≤ Intake Intake Air Temp<24°C(75.2
°F)
➲ Intake Air Temp-0.5°C(31.1
°F)
Intake Air Temp<18°C(64.4
°F)
➲ 18°C(64.4
°F)
• 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
°F)
Compressor OFF Temp. ➲ Setting Temp-0.5°C(0.9
°F)
• In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.
■ Heating Mode Operation
• When the intake air temp reaches +3°(37.4
°F)
…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(37.4
°F)
• While compressor on, the indoor fan is off when the indoor pipe temp. is below 20°C(68
°F)
, when above
27°C(80.6
°F)
, it operates with the low or setting speed. When the indoor pipe temp is between 20°C(68
°F)
and
Function of control
Operation
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