HEAT CONTROLLER, INC.
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.
Combination table
Combination table
Cooling
Heating
Combination of Indoor Unit(kBtu/h)
Operation
Each Capacity
Total Capacity
Each Capacity
Total Capacity
Unit-A
12
Unit-B
12
Total
12
UNIT-A(Btu/h) UNIT-B(Btu/h)
Btu/h
12000
kW
UNIT-A(Btu/h) UNIT-B(Btu/h)
Btu/h
12000
kW
12000
12000
-
3516
7033
12000
12000
-
3516
1 Unit
2 Unit
12
24
12000
24000
12000
24000
7033
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
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.
NOTICE
This symbol indicates special notes.
Service Manual 3
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.
This symbol indicates the possibility of death or serious injury.
WARNING
CAUTION 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.
WARNING
■ Installation
Do not use a defective or under-
rated circuit breaker. Use this
appliance on a dedicated circuit.
For electrical work, contact the
dealer, seller, a qualified electrician,
or an Authorized Service Center
Always ground the product.
.
• There is risk of fire or electric
shock.
• Do not disassemble or repair the
product. There is risk of fire or
electric shock.
• There is risk of fire or electric
shock.
Install the panel and the cover
of control box securely.
Always install a dedicated cir-
cuit and breaker.
Use the correctly rated break-
er or fuse.
• There is risk of fire or electric
shock.
• Improper wiring or installation may • There is risk of fire or electric
cause fire or electric shock shock.
4 Multi type Air Conditioner
Safety Precautions
Do not install, remove, or re-
install the unit by yourself
(customer).
Be cautious when unpacking
and installing the product.
For installation, always con-
tact the dealer or an
Authorized Service Center.
• There is risk of fire, electric shock, • Sharp edges could cause injury.
• There is risk of fire, electric shock,
explosion, or injury.
explosion, or injury.
Be especially careful of the case
edges and the fins on the con-
denser and evaporator.
Do not install the product on a Be sure the installation area
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.
defective installation stand.
does not deteriorate with age.
• It may cause injury, accident, or
damage to the product.
• If the base collapses, the air condi- • Moisture may condense and wet or
tioner could fall with it, causing
property damage, product failure,
and personal injury.
damage furniture.
Do not allow water to run into
electric parts.
Do not store or use flammable Do not use the product in a
gas or combustibles near the
product.
tightly closed space for a long
time.
• It may cause There is risk of fire,
failure of the product, or electric
shock.
• There is risk of fire or failure of
product.
• Oxygen deficiency could occur.
Gasolin
Service Manual 5
Safety Precautions
When flammable gas leaks,
turn off the gas and open a
window for ventilation before
turn the product on.
If strange sounds, or smoke
comes from product. Turn the
breaker off.
Stop operation and close the
window in storm or hurricane.
If possible, remove the prod-
uct from the window before
the hurricane arrives.
• Do not use the telephone or turn
switches on or off. There is risk of
explosion or fire
• There is risk of electric shock or
fire.
• There is risk of property damage,
failure of product, or electric shock.
Do not open the inlet grill of the product
during operation. (Do not touch the elec-
trostatic filter, if the unit is so equipped.)
When the product is soaked
(flooded or submerged), contact not enter the product.
an Authorized Service Center.
Be cautious that water could
• There is risk of physical injury,
electric shock, or product failure.
• There is risk of fire or electric
shock.
• 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.
Turn the main power off when cleaning or
maintaining the product.
• There is risk of fire or electric shock.
• There is risk of electric shock.
6 Multi type Air Conditioner
Safety Precautions
When the product is not to be used for a long time,
disconnect the power by turning off the breaker.
Take care to ensure that nobody could step on
or fall onto the outdoor unit.
• There is risk of product damage or failure, or unintend- • This could result in personal injury and product dam-
ed operation.
age.
CAUTION
■ Installation
Always check for gas (refrigerant) leak-
age after installation or repair of product.
Install the drain hose to ensure that
water is drained away properly.
Keep level even when
installing the product.
• Low refrigerant levels may cause
failure of product.
• A bad connection may cause water • To avoid vibration or water leak-
leakage.
age.
90°
Do not install the product
where the noise or hot air
from the outdoor unit could
oftend neighbors.
Use two or more people to lift
and transport the product.
Do not install the product
where it will be exposed to
sea wind (salt spray) directly.
• It may cause a problem for your
neighbors.
• Avoid personal injury.
• 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 direct-
ly to cool air for long periods
of time.
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.
Do not block the inlet or outlet
of air flow.
(Don't sit in the draft.)
• This could harm to your health.
• There is risk of damage or loss of
• It may cause product failure.
property.
Use a soft cloth to clean. Do
not use harsh detergents, sol-
vents, etc.
Do not touch the metal parts of Do not step on or put anyting
the product when removing the on the product. (outdoor
air filter. They are very sharp!
units)
• There is risk of fire, electric shock, • There is risk of personal injury.
or damage to the plastic parts of
• There is risk of personal injury and
failure of product.
the product.
Always insert the filter secure- Do not insert hands or other
Do not drink the water drained
ly. Clean the filter every two
weeks or more often if neces-
sary.
objects through the air inlet or from the product.
outlet while the product is
operated.
•
A dirty filter reduces the efficiency of • There are sharp and moving parts • It is not sanitary and could cause
the air conditioner and could cause
product malfunction or damage.
that could cause personal injury.
serious health issues.
8 Multi type Air Conditioner
Safety Precautions
Use a firm stool or ladder when cleaning or
maintaining the product.
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 bat-
teries.
• Be careful and avoid personal injury.
• There is risk of fire or explosion
Do not recharge or disassemble the batteries.
Do not dispose of batteries in a fire.
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.
• They may burn or explode.
• The chemicals in batteries could cause burns or other
health hazards.
Service Manual 9
Dimensions
Dimensions
Indoor Unit
Split Type Indoor
H
D
W
Installation plate
Model
Split Type(SE)
12 kBtu/h
Dimension
W
H
mm(in)
mm(in)
mm(in)
895(35.2)
282(11.1)
165(6.5)
D
10 Multi type Air Conditioner
Dimensions
Outdoor Unit
W
L6
L5
L7
MODEL
UE1
24kBtu/h
DIM
W
mm(in)
870(34.3)
800(31.5)
320(12.6)
370(14.6)
25(1.0)
H
mm(in)
mm(in)
mm(in)
mm(in)
mm(in)
mm(in)
mm(in)
mm(in)
mm(in)
D
L1
L2
L3
L4
L5
L6
L7
775(30.5)
25(1.0)
546(21.5)
160(6.3)
160(6.3)
Service Manual 11
Product Specifications
Product Specifications
DMC24DB-1
Operation
Unit
Remarks
1-Unit On
2-Unit On
Item
23,600/24,000
11,800/12,000
208/230V
Cooling Capacity
Heating Capacity
Moisture Removal
Power Source
Btu/h
-
-
ℓ /h(ft3/h)
2.4(0.085)
1.2(0.042)
at 230V
1Ø, 208/230V, 60Hz
ø, V, Hz
Indoor
–
9.4(331.9)
36/32/29
3
Air Circulation
m /min(ft3/min)
Outdoor
Indoor
53(1871.8)
54
–
Noise Level
( Hi / Med / Low )
dB(A)
at 230V
Outdoor
Cooling
2,390/2,390
1,420/1,420
Input
W
A
Heating
Cooling
Heating
Cooling
Heating
-
-
10.1/10.1
6.3/6.3
Runnig
Current
E.E.R.
C.O.P.
208/230V
-
-
.
Btu/h w
9.9/10.1
-
8.3/8.5
-
-
Indoor
895 x 282 x 165(35.2x11.1x6.5)
Dimensions(W x H x D)
Net. Weight
mm(in)
Outdoor
Indoor
Outdoor
Liquid
Gas
870 x 800 x 320(34.2x31.5x12.6)
9.5
kg(lb)
69
6.35(1/4)
Service Valve
mm(In)
g(lb)
9.52(3/8)
Refrigerant(R-410A)
1,600(3.5)
–
at 7.5m
Airflow Direction Control(Up & Down)
Remote Controller Type
Sleeping Operation
O
L.C.D Wireless
O
O
Drain Hose
12 Multi type Air Conditioner
Product Specifications
DMH24DB-1
Operation
Unit
Remarks
1-Unit On
2-Unit On
Item
23,600/24,000
23,600/24,000
2.4(0.085)
11,800/12,000
11,800/12,000
1.2(0.042)
208/230V
at 230V
Cooling Capacity
Heating Capacity
Moisture Removal
Power Source
Btu/h
ℓ /h(ft3/h)
1Ø, 208/230V, 60Hz
ø, V, Hz
Indoor
–
–
9.4(331.9)
36/32/29
3
Air Circulation
m /min(ft3/min)
Outdoor
Indoor
53
54
Noise Level
( Hi / Med / Low )
dB(A)
at 230V
Outdoor
Cooling
2,390/2,390
1,420/1,420
1,620/1,620
6.3/6.3
Input
W
A
Heating
Cooling
Heating
Cooling
Heating
2,440/2,440
10.1/10.1
9.8/9.8
Runnig
Current
E.E.R.
C.O.P.
208/230V
7.2/7.2
.
Btu/h w
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)
Dimensions(W x H x D)
Net. Weight
mm(in)
Outdoor
Indoor
Outdoor
Liquid
Gas
870 x 800 x 320(34.2x31.5x12.6)
9.5
kg(lb)
69
6.35(1/4)
Service Valve
mm(In)
g(lb)
9.52(3/8)
Refrigerant(R-410A)
1,600(3.5)
–
at 7.5m
Airflow Direction Control(Up & Down)
Remote Controller Type
Sleeping Operation
O
L.C.D Wireless
O
O
Drain Hose
Service Manual 13
Installation
Installation
Read carefully, and then follow step by step.
Installation Parts
Installation plate
Type "A" screw and plastic anchor
Remote Control Holder
Type "B" screw
Installation Tools
Figure
Name
Figure
Name
Screw driver
Electric Drill
Ohmmeter
Hexagonal wrench
Measuring Tape, Knife
Hole Core Drill
Ammeter
Gas Leak Detector
Thermometer,
Level
Spanner
Torque wrench
Flaring Tool Set
14 Multi type Air Conditioner
Installation
Select the best location
Indoor unit
1. Do not have any heat or steam near the unit.
More than 5cm
(2.0 inch)
2. Select a place where there are no obstacles in front
of the unit.
More than 5cm
(2.0 inch)
3. Make sure that condensation drainage can be conve-
niently routed away.
More than 2.3m
(90.6 inch)
4. Do not install near a doorway.
5. Ensure the spaces indicated by arrows from the wall,
ceiling, fence or other obstacles.
More than 5cm
(2.0 inch)
6. Use a stud finder to locate studs to prevent unneces-
sary damage to the wall.
CAUTION: Install the indoor unit
on the wall where the height from
the floors more than 2.3m(7.5ft).
Outdoor unit
1. If an awning is built over the unit to prevent direct
sunlight or rain exposure, make sure that heat radia-
tion from the condenser is not restricted.
more than 20cm
(7.9 inch)
2. Ensure that the spaces indicated by arrows around
front, back and side of the unit.
more than 20cm
(7.9 inch)
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 mini-
mum.
more than 70cm
(27.6 inch)
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.
Service Manual 15
Installation
Piping length and elevation
Multi Piping Type
Max Elevation
between each
indoor unit and out-
door unit (h1)
Max elevation
between indoor
units (h2)
Max total length of Max length of each Min length of each
Capacity(Btu/h)
24k
all pipes (A+B)
pipe (A/B)
pipe (A/B)
3m(10ft)
Pipe Size
30m(100ft)
15m(50ft)
7.5m(25ft)
7.5m(25ft)
Indoor Capacity
(Btu/h)
Gas
3/8"
Liquid
Standard Length
Additional Refrigerant
20g/m(0.32oz/ft)
12K
1/4"
7.5m(25ft)
24k
A
B
h1
h1
B
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).
16 Multi type Air Conditioner
Installation
Fixing Installation Plate(Standard Type)
The wall you select should be strong and solid enough to
prevent vibration
Installation Plate
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.
Chassis
Hook
Type "A" screw
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 plate
B
Distance (mm)
CHASSIS
D
(Grade)
A
B
C
D
A
C
Ø70mm
Ø70mm
Left rear piping
Right rear piping
SE
65
110
85
110
Service Manual 17
Flaring Work and Connection of Piping
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.
Copper
pipe
Slanted Uneven Rough
90°
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
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.
Reamer
Point down
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)
Flare nut
Copper tube
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.
Outside diameter
A
Handle
Yoke
mm
Ø6.35
Ø9.52
inch
1/4
mm
0~0.5
0~0.5
Bar
Bar
3/8
Cone
Copper pipe
Clamp handle
Red arrow mark
18 Multi type Air Conditioner
Flaring Work and Connection of Piping
Check
1. Compare the flared work with the figure by.
Smooth all round
Inside is shiny without scratches
2. If a flared section is defective, cut it off and do flaring work
again.
= Improper flaring =
Inclined Surface Cracked Uneven
damaged
thickness
Even length
all round
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 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.
For right rear piping
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 out-
door 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.
Drain hose
If the drain hose is routed inside the room, insulate the hose
with an insulation material* so that dripping from "sweat-
ing"(condensation) will not damage furniture or floors.
*Foamed polyethylene or equivalent is recommended.
Tape
Connecting
pipe
Drain hose
Connecting cable
Service Manual 19
Flaring Work and Connection of Piping
4. Indoor unit installation
Hook the indoor unit onto the upper portion of the installa-
tion 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 installa-
tion plate by moving it left and right.
Connecting
cable
Drain hose
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
Open-end wrench (fixed)
.
mm
Ø6.35
Ø9.52
inch
1/4
kg m
lbf.in
156.2
364.5
1.8
4.2
Flare nut
3/8
Wrench
Connection pipe
3. When extending the drain hose at the indoor unit, install
the drain pipe.
Indoor unit tubing
Drain pipe
Indoor unit drain hose
Vinyl tape(narrow)
Wrap the insulation material around the connecting por-
tion.
Adhesive
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.
Plastic bands
Insulation material
2. Wrap the area which accommodates the rear piping hous-
ing section with vinyl tape.
Indoor unit pipe
Wrap with vinyl tape
Connection pipe
Vinyl tape (wide)
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.
Connecting cable
Pipe
Vinyl tape(narrow)
Wrap with vinyl tape
Pipe
Vinyl tape(wide)
Drain hose
20 Multi type Air Conditioner
Flaring Work and Connection of Piping
For left rear piping
1. Route the indoor tubing and the drain hose to the required
piping hole position.
1
2
2. Insert the piping, drain hose, and the connecting cable into
the piping hole.
Connecting
cable
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.
Drain pipe
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.
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.
Indoor unit tubing
Flare nut Pipes
2. Tighten the flare nut with a wrench.
Outside diameter
Torque
.
mm
Ø6.35
Ø9.52
inch
1/4
3/8
kg m
lbf.in
156.2
364.5
1.8
4.2
Open-end wrench (fixed)
Flare nut
Wrench
Connection pipe
3. When extending the drain hose at the indoor unit, install
the drain pipe.
Indoor unit tubing
Drain hose
Indoor unit drain hose
Vinyl tape (narrow)
Adhesive
Service Manual 21
Flaring Work and Connection of Piping
Wrap the insulation material around the connecting por-
tion.
Plastic bands
Insulation material
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.
Indoor
unit piping
Connection
pipe
Vinyl tape
(wide)
Wrap with vinyl tape
Pipe
Vinyl tape(narrow)
Connecting cable
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.
Pipe
Drain hose
Vinyl tape(narrow)
Wrap with
vinyl tape(wide)
Reroute the pipings and the drain hose across the back
of the chassis.
Indoor unit installation
1. Remove the spacer.
Piping for
passage through
piping hole
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).
Connecting
cable
Drain hose
22 Multi type Air Conditioner
Flaring Work and Connection of Piping
REMOTE CONTROL PREPARATION(OPTIONAL)
HOW TO MOUNT ONTO A WALL
HOW TO INSERT BATTERIES
Remove the battery cover from the remote con-
troller.
• Slide the cover according to the arrow direction.
• Do not use rechargeable batteries,
such batteries differ from standard dry
cells in shape, dimensions, and per-
formance.
• Romove the batteries from the remote
controller if the air conditioner is not
going to be used for some long time.
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.
Service Manual 23
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.
Outdoor unit
• When tightening the flare nut with torque wrench, ensure
the direction for tightening follows the arrow on the wrench.
Outside diameter
Torque
A-UNIT
Gas side piping
.
mm
Ø6.35
Ø9.52
inch
1/4
kg m
lbf.in
156.2
364.5
1.8
4.2
B-UNIT
Liquid side piping
3/8
Torque wrench
24 Multi type Air Conditioner
Flaring Work and Connection of Piping
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 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.
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
Main power source
between power source and the outdoor
unit as shown below.
Air
Circuit Breaker
Conditioner
Use a circuit breaker
or time delay fuse.
WARNING: The power cord connected to the outdoor unit should be complied with the following speci-
fications (ETL recognized and CSA certified).
Wire gauge per
MCA on unit name plate
Line voltage (208~230V)
and local and national code.
The power connecting cable connected to the indoor and outdoor unit should be complied with the fol-
lowing specifications (ETL recognized and CSA certified).
AWG18
Low voltage (below 40V)
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.
Service Manual 25
Connecting the Cable between Indoor Unit and Outdoor Unit
Connect the cable to the Outdoor unit.
1. Remove the cover control from the unit by loosening the
screw.
Outdoor unit
Connect the wires to the terminals on the control board
individually as the following.
Terminal block
Over 5mm
2. Secure the cable onto the control board with the holder
(clamper).
Holder for
power supply
cord
3. Refix the cover control to the original position with the
screw.
Power supply
cable
24k Outdoor side
A-UNIT
B-UNIT
1
2
3
4
1
2
3
4
Cover control
Connecting
cable
Connecting cable(Low voltage)
L
N
1
2
3
4
1
2
3
4
Terminal BLOCK
Terminal BLOCK
Power Source
208/230V AC
(High voltage)
Indoor A-UNIT
Indoor B-UNIT
NOTICE
:
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.
26 Multi type Air Conditioner
Connecting the Cable between Indoor Unit and Outdoor Unit
Connection method of the connecting cable(Example)
(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)
Terminal
block
(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.
Cord clamp
Cap(Reuse)
G
Lock nut
Hole
(for low voltage line)
Cap(Remove)
Taping
WARNING: Loose wiring may cause the termi-
nal to overheat or result in unit malfunction. A
fire hazard may also exist. Therefore, be sure
all wiring is tightly connected.
(for sealing)
Power supply line Conduit panel
(1ø, 230/208V)
Low voltage line
(connecting cable)
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.
High voltage
Strand wire
How to connect wiring to the terminals
■ For strand wiring
Round
terminal
(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.
Low voltage
Loosening the
terminal block
screw
Fastening the
wire tightly
Connecting cable
Service Manual 27
Connecting the Cable between Indoor Unit and Outdoor Unit
CAUTION: Provide a circuit breaker between power source and the unit as shown
below.
Main power source
Air
Fuse or breaker
Model
24k
Power source
Circuit Breaker
Use a circuit
breaker or time
delay fuse.
Conditioner
Capacity
Per max. fuse size
on unit name plate
1Ø, 230/208V
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 respec-
tively.
Connecting cable
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.
Downward slope
2. Do not make drain piping.
Accumulated
drain water
Do not raise
Less than
50mm gap
Tip of drain hose
dipped in water
Air
Water
leakage
Water
leakage
Water
leakage
Waving
Ditch
Service Manual 29
Checking the Drainage, Forming the Pipings and Long Pipe Setting
Forming the piping
Form the piping by wrapping the con-
necting portion of the indoor unit with
insulation material and secure it with
two kinds of vinyl tape.
Seal a small
opening around
the pipings with
gum type sealer.
Taping
Drain hose
• 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.
Plastic
band
Pipings
Connecting
cable
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
Power supply
cord
down to up.
2. Secure the tapped piping along the exterior wall using
• Trap is required to prevent water from entering
into electrical parts.
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.
Seal a small opening
around the pipings
with gum type sealer.
Trap
3. Fix the piping onto the wall by saddle or equivalent.
Trap
30 Multi type Air Conditioner
Air Purging and Evacuation
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 incondensi-
ble gas and moisture in the system.
Checking method
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.
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 ser-
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.
vice valve caps from both the gas and the liquid side on the out-
door 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 nitro-
gen gas cylinder to this service port with charge hoses.
CAUTION: Be sure to use a manifold
valve for leak testing.
Indoor unit
The high side manifold valve must always
be kept closed.
Outdoor unit
• 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.
Manifold valve
Pressure
Lo
Hi
gauge
Charge hose
NOTICE
:
Leakage test shoud be done for each indoor
unit connection set, separately.
Nitrogen gas
cylinder(in vertical
standing position)
Service Manual 31
Checking the Drainage, Forming the Pipings and Long Pipe Setting
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.
Indoor unit
The operation time for evacuation varies with tubing length
and capacity of the pump. The following table shows the
time required for evacuation.
Outdoor unit
Required time for evacuation when 4 CFM vacuum
pump is used
If tubing length is longer
than 10m (33 ft)
If tubing length is less
than 10m (33 ft)
10 min. or more
15 min. or more
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.
Manifold valve
2. Turn the valve stem of gas side valve counter-clockwise to
fully open the valve.
Pressure
gauge
Lo
Hi
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 ser-
vice port and fasten the flare nut securely with an
adjustable wrench. This process is very important to pre-
vent leakage from the system.
Open
Close
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.
Vacuum pump
NOTICE
: 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 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).
Max Elevation
between each indoor
each pipe (A/B) each pipe (A/B) unit and outdoor unit
(h1)
Max total length
of all pipes
(A+B)
Max elevation
between indoor
units (h2)
Additional
Refrigerant
Max length of
Min length of
Capacity (Btu/h)
24k
30m(100ft)
15m(50ft)
3m(10ft)
7.5m(25ft)
7.5m(25ft)
20g/m(0.22oz/ft)
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.
Service Manual 33
Test Running
Test Running
Split Type
1. Check that all tubing and wiring have been properly con-
Bolt
nected.
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 (–)
Tubing connection
of battery are installed correctly.
Reattach the cover by pushing it back into position.
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).
Outside ambient
TEMP.
The pressure of the gas side
service valve.
Refrigerant
R-410A
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.
35°C (95°F) 8.5~9.5kg/cm2G(120~135 P.S.I.G.)
2) Precautions in test run
Intake temperature
■ The initial power supply must provide at least 90% of
the rated voltage.
Otherwise, the air conditioner should not be operated.
Discharge air
■ 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 compres-
sor. Then attention must be paid.
■ Carry out the test run more than 5 minutes without
fail. (Test run will be cancelled 18 minutes later auto-
matically)
Discharge
temperature
■ 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.
34 Multi type Air Conditioner
Operation
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
■ 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
Compressor OFF Temp
■■Setting Temp+0.5°C(0.9°F)
■ 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)
18°C(64.4°F) ≤ Intake Intake Air Temp<24°C(75.2°F)
Intake Air Temp<18°C(64.4°F)
■■ Intake Air Temp-1°C(30.2°F)
■■ Intake Air Temp-0.5°C(31.1°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
Service Manual 35
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