Heat Controller Inc Air Conditioner DMH24SB 1 User Manual
HEAT CONTROLLER, INC.  
Wall Mounted  
Mini-Split System  
Single-Zone  
Air Conditioning/Heat Pump  
S ervice M anual  
DMC09SB-0/DMH09SB-0  
DMC12SB-0/DMH12SB-0  
DMC18SB-1/DMH18SB-1  
DMC24SB-1/DMH24SB-1  
Before servicing the unit, read the  
“safety precautions” in this manual.  
Only for authorized service personnel.  
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.  
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  
For electrical work, contact the  
dealer, seller, a qualified electri-  
cian, or an Authorized Service  
Center.  
Install the panel and the cover of  
control box securely.  
Do not install, remove, or re-install  
the unit by yourself (customer).  
• There is risk of fire or electric shock.  
• There is risk of fire or electric shock.  
• There is risk of fire, electric shock,  
explosion or injury.  
Be cautious when unpacking and  
installing the product.  
For installation, always contact the  
dealer or an Authorized Service  
Center.  
Do not install the product on a  
defective installation stand.  
• Shape edges could cause injury. Be  
especially careful of the sharp  
edges.  
• There is risk of fire, electric shock,  
explosion, or injury.  
• It may cause injury, accident, or  
damage to the product.  
Service Manual 3  
Safety Precautions  
Be sure the installation area does  
not deteriorate with age.  
Install the indoor unit on the wall  
where the height from the floors  
more than 8ft(2.4m)  
Do not handle the pipe by your-  
self(Costomer)  
• If the base collapses, the air condi-  
tioner could fall with it, causing prop-  
erty damage, product failure, and  
personal injury.  
• There are sharp moving parts that  
could cause personal injury.  
• High-Pressure refrigent may cause  
personal injury.  
8ft(2.4m)  
■ Operation  
Do not allow water to run into  
electric part.  
Do not let the air conditioner run  
for a long time when the humidity  
is very high and a door or a win-  
dow is left open.  
Do not store or use flammable gas  
or combustibles near the air condi-  
tioner.  
• There is risk of fire, failure of the  
product, and/or electric shock.  
• Moisture may condense and wet or  
damage furnishings.  
• There is risk of fire or product failure.  
Do not use the product in a tightly  
closed space for a long time.  
When flammable gas leaks, turn off the gas  
and open a window for ventilation before  
turning the product on. Do not use the tele-  
phone or turn switches on or off.  
Turn off breaker to the unit if  
strange sounds odors or smoke  
comes from it.  
• Oxygen deficiency could occur.  
• There is risk of explosion or fire.  
•
There is risk of fire, Product faiure,  
and/or electric shock.  
•
Some ventilation by opening window is  
necessary for the fresh air  
4 Room Air Conditioner  
Safety Precautions  
Stop operation and close any win-  
dow in storm or hurricane before  
the hurricane arrives.  
Do not open the inlet grill of the  
product during operation. (Do not  
touch the electrostatic filter, if the  
unit is so equipped.)  
When the product is soaked (flood-  
ed or submerged), contact an  
Authorized Service Center.  
• There is risk of property damage,  
failure of product, or electric shock.  
• There is risk of physical injury, elec-  
tric shock, or product.  
• There is risk of electrical shock.  
Ventilate the product from time to  
time when operating it together  
with a stove, etc.  
Turn off breaker to the appliance  
before performing cleaning or  
maintenance.  
When the product is not be used  
for a long time disconnect the  
power supply by turning off the  
breaker.  
• There is risk of fire or electrical  
shock.  
• There is risk of electric shock.  
• 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.  
Do not insert hands or other objects through the air  
inlet or outlet while the air conditioner is on.  
• There could result in personal injury and product dam-  
age.  
• There are sharp and moving parts that could cause per-  
sonal injury.  
Service Manual 5  
Safety Precautions  
■ Installation  
Always check for gas(refrigerant)  
leakage after installation or repair  
of product.  
Install the drain hose to ensure that Keep level even when installing the  
water is drained away properly.  
product.  
• Low refrigerant levels may cause  
product failure.  
• A bad connection may cause water  
leakage.  
• To avoid vibration or water leakage.  
90˚  
Do not install the product where  
the noise or hot air from the out-  
door unit could offend neighbors.  
Use two or more people to lift and  
transport the air conditioner.  
Do not install the product where it  
will be exposed to sea wind (salt  
spray) directly.  
• Avoid personal injury.  
• It may cause a problem for your  
neighbors.  
• It may cause corrosion in the prod-  
uct. Corrosion, particularly on the  
condenser and evaporator fins,  
could cause product malfunction or  
inefficient operation.  
■ Operation  
Do not direct airflow at room occu-  
pants.  
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 refrigera-  
tion system.  
Do not block the inlet or outlet of  
air flow.  
• This could damage your health.  
• There is risk of damage or loss of  
property.  
• It may cause product failure.  
6 Room Air Conditioner  
Safety Precautions  
Use a soft cloth to clean.  
Do not use harsh detergents, sol-  
vents, etc.  
Do not touch the metal parts of the  
product when removing the air fil-  
ter. They are very sharp!  
Do not step on or put anything on  
the product. (outdoor unit)  
• There is risk of fire, electric shock or  
damage to the plastic parts of the  
product.  
• There is risk of personal injury.  
• 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.  
Do not drink the water drained from Use a firm stool or ladder when  
the unit.  
cleaning or maintaining the air con-  
ditioner.  
• It is not sanitary and could cause  
• A dirty filter reduces the efficiency of  
the air conditioner and could cause  
product malfunction or damage.  
• Be careful and avoid personal injury.  
serious health issues.  
■ Disuse  
Replace all the batteries in the  
remote.  
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.  
• There is risk of fire or explosion.  
• They may burn or explode.  
• The chemicals in batteries could  
cause burns or other health hazards.  
Service Manual 7  
Dimensions  
Dimensions  
Indoor Unit  
H
D
W
Installation plate  
Model  
9 Btu Series  
(C/O)  
9 Btu Series  
(H/P)  
12 Btu Series  
Dimension  
W
H
mm(inch)  
mm(inch)  
mm(inch)  
840(33.1)  
270(10.6)  
153(6.0)  
894(35.2)  
295(11.6)  
165(6.5)  
894(35.2)  
295(11.6)  
165(6.5)  
D
8 Room Air Conditioner  
Dimensions  
H
D
W
Installation plate  
Model  
18 Btu Series  
24 Btu Series  
Dimension  
W
H
mm(inch)  
mm(inch)  
mm(inch)  
1090(42.9)  
300(11.8)  
178(7.0)  
1090(42.9)  
300(11.8)  
178(7.0)  
D
Service Manual 9  
Dimensions  
Outdoor Unit  
1. 9k, 12k  
L2  
W
L3  
Gas side  
(3-way valve)  
Liquid side  
(2-way valve)  
MODEL  
unit  
9k, 12k  
DIM  
W
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
770(30.3)  
540(21.3)  
245(9.6)  
287(11.3)  
64(2.5)  
H
D
L1  
L2  
L3  
L4  
L5  
518(20.4)  
10(0.4)  
100(3.9)  
10 Room Air Conditioner  
Dimensions  
2. 18k, 24k  
W
L6  
L5  
L7  
L8  
MODEL  
18k, 24k  
DIM  
W
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
mm(inch)  
870(34.3)  
655(25.8)  
320(12.6)  
370(14.6)  
25(1.0)  
H
D
L1  
L2  
L3  
L4  
L5  
L6  
L7  
L8  
L9  
L10  
630(24.8)  
25(1.0)  
546(21.5)  
162(6.4)  
162(6.4)  
54(2.1)  
74.5(2.9)  
79(3.1)  
Service Manual 11  
Introduction  
Introduction  
Symbols Used In This Manual  
This symbol alerts you to the risk of electric shock.  
This symbol alerts you to hazards that may cause harm to the air condi-  
tioner.  
This symbol indicates special notes.  
NOTICE  
Features  
Air Inlet  
Front Panel  
Air Filter  
Signal Receptor  
Air Intake Vents  
Connecting  
Wires  
Connecting  
Wires  
Air Intake  
Vents  
Piping  
Piping  
Air Outlet  
Vents  
Drain Hose  
Drain Hose  
Air Outlet Vents  
Base Plate  
Base Plate  
12 Room Air Conditioner  
Introduction  
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  
Ohmmeter  
Electric Drill  
Hexagonal wrench  
Measuring Tape, Knife  
Hole Core Drill  
Ammeter  
Gas Leak Detector  
Thermometer,  
Level  
Spanner  
Torque wrench  
Flaring Tool Set  
Service Manual 13  
Installation  
Installation Map  
NOTICE  
Installation parts you should purchase.  
Installation plate  
Sleeve  
Bushing-Sleeve  
Putty(Gum Type Sealer)  
Bend the pipe as closely  
on the wall as possible,  
but be careful that it  
doesn't break.  
Air Discharge  
Operation Indication Lamps/  
Signal Receptor  
Vinyl tape (Wide)  
• Apply after carrying out a  
drainage test.  
• To carry out the drainage  
test, remove the air filters  
and pour water into the heat  
exchanger.  
Forced Operation Button  
Saddle  
Gas side piping  
(Optional Parts)  
(Optional Parts)  
Air Inlet Vents  
Liquid side piping  
Additional drain pipe  
Air Outlet Vents  
Vinyl tape (Narrow)  
Drain Hose  
Connecting cable  
(Optional Parts)  
Base Plate  
14 Room Air Conditioner  
Installation  
Confirm The Refrigerant  
1. Check the quality label on the indoor and outdoor unit.  
2. Make certain that the refrigerant is R-410A.  
NOTICE  
THIS PRODUCT CONTAINS R-410A REFRIGERANT  
1) Different compressor oil  
- R-410A(Polyol ester) / R-22(Mineral).  
- Do not mix the existing mineral oil.  
- Do not apply used pipe, tools and gauges covered with the existing mineral oil.  
2) Absorption of moisture  
-Compressor’s oil has the high absorption rate of moisture.  
3) Composition  
- R-410A(R32:R125=50:50wt%).  
NOTE: Never mix with other refrigerants  
4) High pressure.  
- 1.6 times higher than R-22.  
- High Pressure refrigerant may cause personal injury.  
Do not handle the pipe by yourself (customer) High-pressure refrigerant may cause personal injury.  
- manifold gauge ,charging and any piping tools must be dedicated to R-410A systems.  
Service Manual 15  
Installation  
Select The Best Location  
6. Use a stud finder to locate studs to prevent  
unnecessary damage to the wall.  
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.  
More than  
12cm(4.7in)  
3. Make sure that condensation drainage can be  
conveniently routed away.  
More than  
30cm(11.8in)  
4. Do not install near a doorway.  
More than  
30cm(11.8in)  
5. Ensure that the space around the left and right  
of the unit is more than 30cm(11.8in). The unit  
should be installed as high on the wall as possi-  
ble, allowing a minimum of 12cm(4.7in) from  
ceiling.  
More than 2.4meters(8ft)  
Install the indoor unit on the wall where the height from the floors more than 2.3meters(7.6ft).  
A minimum pipe run of 7.5meters(24.6ft) is required to minimize vibration and excessive noise.  
Outdoor unit  
5. Select a place so that the warm air and noise  
from the air conditioner do not disturb neigh-  
bors.  
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 space around the back and  
sides is more than 10cm(3.9in). The front of the  
unit should have more than 70cm(27.6in) of  
space.  
More than  
60cm(23.6in)  
More than  
More than  
10cm(3.9in)  
10cm(3.9in)  
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.  
More than  
More than  
70cm(27.6in)  
60cm(23.6in)  
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.  
If the outdoor unit is installed on roof structures or walls, this may result in excessive noise and vibra-  
tion, and may be also classed as non serviceable installation.  
16 Room Air Conditioner  
Installation  
Piping Length And Elevation  
Standard  
Max.  
Max.  
Pipe Size  
Additional Refrigerant  
g/m(oz/ft)  
Capacity  
Length  
Elevation  
length  
(Btu/h)  
Suction  
Evap  
m(ft)  
B
m(ft)  
A
m(ft)  
3/8"  
1/2"  
1/2"  
1/2"  
5/8"  
5/8"  
1/4"  
1/4"  
1/4"  
1/4"  
1/4"  
1/4"  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
15(49)  
7.5(25)  
7.5(25)  
15(49)  
15(49)  
15(49)  
30(98)  
15(49)  
15(49)  
20(0.22)  
20(0.22)  
20(0.22)  
20(0.22)  
20(0.22)  
20(0.22)  
9k  
12k  
18k  
24k  
Outdoor unit  
Outdoor unit  
A
Oil trap  
A
Indoor unit  
Indoor unit  
B
B
In case more than 5m(16.4ft)  
• Capacity is based on standard length and maximum allowance length is on the basis of reliability.  
• Oil trap should be installed every 5~7meters (16.4~23.0ft).  
Service Manual 17  
Installation  
How To Mount Installation Plate  
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”  
2. Measure the wall and mark the centerline. It is also important to use caution concerning the location of the instal-  
lation 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.  
Distance (inch)  
CHASSIS  
(Grade)  
A
B
C
D
S4  
SE  
9k  
9k  
C/O  
H/P  
1.97  
2.56  
4.13  
4.33  
2.32  
3.35  
4.13  
4.33  
Installation plate  
B
D
12k C/O, H/P  
18k C/O, H/P  
24k C/O, H/P  
A
C
Ø70mm  
Ø70mm  
S5  
3.74  
4.80  
9.25  
4.80  
Left rear piping  
Right rear piping  
Drill a Hole In The Wall  
• Drill the piping hole with a ø70mm(2.76in) hole  
core drill. Drill the piping hole at either the right  
or the left with the hole slightly slanted to the out-  
door side.  
WALL  
Indoor  
Outdoor  
18 Room Air Conditioner  
Installation  
Flaring Work  
Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the follow-  
ing 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 out-  
Copper  
pipe  
Slanted Uneven Rough  
90°  
door unit.  
3. Cut the pipes a little longer than measured distance.  
4. Cut the cable 1.5m(59.1in) longer than the pipe length.  
Burrs removal  
Pipe  
1. Completely remove all burrs from the cut cross section  
of pipe/tube.  
Reamer  
2. Put the end of the copper tube/pipe in a downward  
direction as you remove burrs in order to avoid drop-  
ping burrs into the tubing.  
Point down  
Putting nut on  
Flare nut  
• Remove flare nuts attached to indoor and outdoor unit,  
then put them on pipe/tube having completed burr  
removal.  
Copper tube  
(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 dimen-  
sion shown in the table above.  
Outside diameter  
A
Handle  
mm  
inch  
1/4  
3/8  
1/2  
5/8  
mm  
inch  
Ø6.35  
Ø9.52  
Ø12.7  
Ø15.88  
0~0.5  
0~0.5  
0~0.5  
0~1.0  
0~0.020  
0~0.020  
0~0.020  
0~0.039  
Bar  
Bar  
Yoke  
Cone  
Copper pipe  
Clamp handle  
Red arrow mark  
Service Manual 19  
Installation  
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 illus-  
tration 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 left rear piping  
Route the indoor tubing and the drain  
hose in the direction of rear left.  
1
2
Connecting  
cable  
Insert the connecting cable into the indoor unit  
from the outdoor unit through the piping hole.  
Drain pipe  
• Do not connect the cable to the indoor unit.  
• Make a small loop with the cable for easy con-  
nection later.  
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 upper  
side can cause drain pan to overflow inside the  
unit.  
NOTICE  
If the drain hose is routed inside the room, insu-  
late the hose with an insulation material* so that  
dripping from "sweating"(condensation) will not  
damage furniture or floors.  
*Foamed polyethylene or equivalent is recom-  
mended.  
Indoor unit  
Spacer  
Indoor unit installation  
• Hook the indoor unit onto the upper portion of  
the installation plate.(Engage the three hooks of  
the rear top and rear lower of the indoor unit with  
Installation plate  
8cm  
the upper edge and lower edge of the installation  
plate.) Ensure that the hooks are properly seated  
on the installation plate by moving it left and  
right.  
20 Room Air Conditioner  
Installation  
Connecting the pipings to the indoor unit  
and drain hose to drain pipe.  
Wrap the insulation material around the  
connecting portion.  
• Put a couple drops of refrigerant oil on the face  
of the flare before assembling taking care not to  
add any contaminants.  
• Overlap the connection pipe insulation material  
and the indoor unit pipe insulation material. Bind  
them together with vinyl tape so that there is no  
• Align the center of the pipings and sufficiently  
tighten the flare nut by hand.  
gap.  
Plastic bands  
Insulation material  
Indoor unit tubing  
Flare nut Pipings  
• Tighten the flare nut with a wrench.  
• Wrap the area which accommodates the rear piping  
housing section with vinyl tape.  
Indoor unit tubing  
Torque wrench  
Connection pipe  
Indoor  
unit pipe  
Connection  
pipe  
Flare nut  
Vinyl tape  
(wide)  
Wrap with vinyl tape  
Spanner (fixed)  
Connecting cable  
Outside diameter  
Torque  
mm  
inch  
Pipe  
Ø6.35  
Ø9.52  
Ø12.7  
Ø15.88  
1/4  
3/8  
1/2  
5/8  
13.0  
30.4  
39.8  
47.7  
Vinyl tape(narrow)  
• Bundle the piping and drain hose together by  
wrapping them with vinyl tape over the range  
within which they fit into the rear piping housing  
section.  
• Mount the clamp on the boss with a type "B"  
screw.(SE-H/P: 9k, 12k C/O: 12k)  
Wrap with vinyl tape  
Type "B" screw  
Clamp  
Drain hose  
Boss  
Pipe  
Vinyl tape(wide)  
Drain hose  
• When extending the drain hose at the indoor  
unit, install the drain pipe.  
For right rear piping  
Route the indoor tubing and the drain  
hose to the required piping hole position.  
Drain pipe  
Indoor unit drain hose  
Vinyl tape(narrow)  
Adhesive  
Drain hose  
Service Manual 21  
Installation  
Insert the connecting cable into the indoor  
unit.  
Spanner (fixed)  
Flare nut  
• Don't connect the cable to the indoor unit.  
• Make a small loop with the cable for easy con-  
nection later.  
Connection pipe  
Torque wrench  
Indoor unit tubing  
Tape the drain hose and the connecting cable.  
Outside diameter  
Torque  
(lbf ft)  
13.0  
30.4  
39.8  
47.7  
.
• Connecting cable  
mm  
inch  
1/4  
3/8  
1/2  
5/8  
Ø6.35  
Ø9.52  
Ø12.7  
Ø15.88  
Tape  
Connecting  
pipe  
• Mount the clamp on the boss with a type "B"  
screw.(SE-H/P: 9k, 12k C/O: 12k)  
Drain hose  
Connecting cable  
Type "B" screw  
Clamp  
Drain hose  
Indoor unit installation  
Boss  
• Hook the indoor unit onto the upper portion of  
the installation plate.(Engage the three hooks of  
the rear top and rear lower of the indoor unit with  
the upper edge and lower edge of the installation  
plate.) Ensure that the hooks are properly seated  
on the installation plate by moving it left and  
right.  
• When extending the drain hose at the indoor  
unit, install the drain pipe.  
Drain hose  
Connecting  
cable  
Indoor unit drain hose  
Drain hose  
Vinyl tape (narrow)  
Adhesive  
Connecting the pipings to the indoor unit  
and the drain hose to drain pipe.  
Wrap the insulation material around the  
connecting portion.  
• Put a couple drops of refrigerant oil on the face  
of the flare before assembling taking care not to  
add any contaminants  
• Overlap the connection pipe heat insulation and  
the indoor unit pipe heat insulation material.  
Bind them together with vinyl tape so that there  
is no gap.  
• Align the center of the pipings and sufficiently  
tighten the flare nut by hand.  
Plastic bands  
Insulation material  
Indoor unit tubing  
Flare nut Pipings  
• Tighten the flare nut with a wrench.  
22 Room Air Conditioner  
Installation  
• Wrap the area which accommodates the rear  
piping housing section with vinyl tape.  
Reroute the pipings and the drain hose  
across the back of the chassis.  
Indoor  
unit piping  
Connection  
pipe  
Vinyl tape  
(wide)  
Wrap with vinyl tape  
Pipe  
Piping for  
passage through  
piping hole  
Vinyl tape(narrow)  
Connecting cable  
Reroute the pipings and the drain hose  
across the back of the chassis.  
• 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.  
Connecting  
cable  
Drain hose  
Pipe  
Drain hose  
Vinyl tape(narrow)  
Wrap with  
vinyl tape(wide)  
Service Manual 23  
Installation  
Installation Information. For left piping. Follow the instruction below.  
Correct case  
• Press on the upper side of clamp and unfold the tubing to downward slowly.  
Incorrect case  
• Following bending type from right to left may cause damage to the tubing.  
24 Room Air Conditioner  
Installation  
Connection Of The Drain Hose  
• The drain hose can be connected at two different  
positions. Use the most convenient position and, if  
necessary, exchange the position of the drain pan,  
rubber cap and the drain hose.  
2
4
■■Drain pan  
3
■■Rubber cap  
■■Drain hose  
1
■■Exchange if necessary  
• Remove the drain hose.  
• Securely insert both the rubber plug and drain hose  
into the drain outlets.  
Be sure the rubber the cap is securely fastened so  
that there is no leakage.  
Connection Of Piping -Outdoor  
Put a couple drops of refrigerant oil on  
the face of the flare before assembling  
taking care not to add any contaminants.  
Outdoor unit  
Suction Line piping  
(Bigger diameter)  
Align the center of the pipings and suffi-  
ciently tighten the flare nut by hand.  
Evaporator Line  
piping  
(Smaller  
diameter)  
Finally, tighten the flare nut with torque  
wrench until the wrench clicks.  
Torque wrench  
• When tightening the flare nut with torque  
wrench, ensure the direction for tightening fol-  
lows the arrow on the wrench.  
Outside diameter  
Torque  
(lbf ft)  
13.0  
30.4  
39.8  
47.7  
47.7  
.
mm  
inch  
1/4  
3/8  
1/2  
5/8  
3/4  
Ø6.35  
Ø9.52  
Ø12.7  
Ø15.88  
Ø19.05  
Service Manual 25  
Installation  
Connection Of The Cable  
1. Remove the cover control from the unit by  
loosening the 3 screws.  
Wiring Diagram  
Connecting cable(Low voltage)  
b
Indoor Unit  
Outdoor Unit  
2. Dismount caps on the conduit panel.  
Terminal  
(4P)  
Terminal  
(6P)  
3. Temporarily mount the conduit tubes on the  
conduit panel.  
1
2
3
4
1
2
3
4
Power supply  
a
4. Properly connect both the power supply and  
low voltage lines to the corresponding ter-  
minals on the terminal block.  
5
L1*  
6
L2  
To  
branch  
circuit  
5. Ground the unit in accordance with local  
codes.  
G
Ground  
6. Be sure to size each wire allowing several  
inches longer than the required length for  
wiring.  
L1 is neutral for 115V models.  
*
NOTICE  
7. Use lock nuts to secure the conduit tubes.  
1.  
shows field wiring.  
2. Separately wire the high and low voltage line.  
NOTICE  
Connector trade size for this unit is 1/2" for  
instructions on connecting depending on  
the wire type you are using.  
3. Use heat-proof electrical wiring capable of  
withstanding temperatures up to 167°F(75°C).  
4. Use outdoor and waterproof connection cable  
rated more than 300V for the connection  
between indoor and outdoor 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).  
Outdoor unit  
Terminal block  
• Every wire must be connected firmly.  
Over 5mm  
• No wire should be allowed to touch refrig-  
erant tubing, the compressor or any mov-  
ing parts.  
(0.2")  
Conduit panel  
Connecting  
cable  
Power Supply  
Power supply  
cord  
AWG(MIN.)  
AWG MCA  
MOP(MAXIMUN OVER-  
Model  
Power source  
CURRENT PROTECTION)  
Cover control  
9k Cooling  
9k Heating  
1ø, 115V  
1ø, 115V  
18  
8.6  
15  
20  
20  
20  
20  
30  
30  
30  
14 14.3  
14 14.3  
14 14.3  
12k Cooling 1ø, 115V  
12k Heating 1ø, 115V  
18k Cooling 1ø, 230/208V 14 13.6  
18k Heating 1ø, 230/208V 14(12) 17.7  
24k Cooling 1ø, 230/208V 14(12) 17.7  
24k Heating 1ø, 230/208V 14(12) 17.7  
26 Room Air Conditioner  
Installation  
After the confirmation of the above conditions, prepare the wiring as follows:  
1) Never fail to have an individual power circuit specifically for the air conditioner. As for the  
method of wiring, be guided by the circuit diagram posted on the inside of control cover.  
2) The screw which fasten the wiring in the casing of electrical fittings are liable to come  
loose from vibrations to which the unit is subjected during the course of transportation.  
Check them and make sure that they are all tightly fastened. (If they are loose, it could  
cause burn-out of the wires.)  
3) Specification of power source.  
4) Confirm that electrical capacity is sufficient.  
5) Confirm that the starting voltage is maintained at more than 90 percent of the rated volt-  
age marked on the name plate.  
6) Confirm that the cable thickness is as specified in the power source specification.  
(Particularly note the relation between cable length and thickness.  
7) Always install an GFCI circuit breaker in a wet or moist area.  
8) The following would be caused by voltage drop.  
• Vibration of a magnetic switch, which will damage the contact point, open fuse, disturbance of  
the normal function of the overload.  
9) The means for disconnection from a power supply shall be incorporated in the fixed  
wiring and have an air gap contact separation of at least 3mm(0.12in) in each  
active(phase) conductors.  
Service Manual 27  
Installation  
Checking The Drainage  
• Pour a glass of water on the drain pan.  
• Ensure the water flows through the drain hose of the indoor unit without any leakage and goes out the  
drain exit.  
Connecting area  
drain hose  
Leakage  
checking  
Drain pan  
Drain  
hose  
Leakage  
checking  
Drain piping  
• The drain hose should point downward for easy drain flow.  
Downward slope  
• Avoid these situations.  
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  
28 Room Air Conditioner  
Installation  
Forming The Piping  
In cases where the Outdoor unit is  
installed above the Indoor unit perform  
the following.  
Form the piping by wrapping the connect-  
ing portion of the indoor unit with insula-  
tion material and secure it with two kinds  
of vinyl tapes.  
• Tape the piping and connecting cable from  
down to up.  
• 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 appro-  
priately.  
• Secure the taped piping along the exterior wall.  
Form a trap to prevent water entering the room.  
• Fix the piping onto the wall by saddle or equiva-  
lent.  
In cases where the outdoor unit is  
installed below the indoor unit perform the  
following.  
Seal a small opening  
around the pipings  
with gum type sealer.  
Trap  
• Tape the piping, drain hose and connecting  
cable from down to up.  
• Secure the tapped piping along the exterior wall  
using saddle or equivalent.  
Seal small openings  
around pipings with a  
gum type sealer.  
Trap  
Taping  
Drain  
hose  
Pipings  
Connecting  
cable  
Trap is required to prevent water  
from entering into electrical parts.  
Service Manual 29  
Installation  
Air Purging  
Air and moisture remaining in the refrigerant system have undesirable effects as indicated below.  
• Pressure in the system rises.  
• Operating current rises.  
• Cooling(or heating) efficiency drops.  
• Moisture in the refrigerant circuit may freeze and block capillary tubing.  
• Water may lead to corrosion of parts in the refrigeration system.  
Therefore, the indoor unit and tubing between the indoor and outdoor unit must be leak tested and  
evacuated to remove any noncondensables and moisture from the system.  
Air purging With Vacuum Pump  
Preparation  
• Do a leak test of all joints of the tubing(both  
• Check that each tubing(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. Note that both the liquid and the  
gas side service valves on the outdoor unit are  
kept closed at this stage.  
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.  
• 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.  
Leak test  
• Connect the manifold valve(with pressure gauges)  
and dry nitrogen gas cylinder to this service port  
with charge hoses.  
Manifold valve  
Pressure  
Indoor unit  
gauge  
Lo  
Hi  
Be sure to use a manifold valve for air purging. If it  
is not available, use a stop valve for this purpose.  
The "Hi" knob of the manifold valve must always be  
kept close.  
Charge hose  
Outdoor unit  
Nitrogen gas  
cylinder(in vertical  
standing position)  
• Pressurize the system to no more than 150  
P.S.I.G. with dry nitrogen gas and close the cylin-  
der valve when the gauge reading reached 150  
P.S.I.G. Next, test for leaks with liquid soap.  
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.  
30 Room Air Conditioner  
Installation  
Soap water method  
(1) Remove the caps from the gas side and liquid side  
valves.  
Suction Line  
(2) Remove the service-port cap from the gas side  
valve.  
(3) To open the gas side valve turn the valve stem  
counterclockwise approximately 90°, wait for about  
2~3 seconds, and close it.  
(4) Apply a soap water or a liquid neutral detergent on  
the indoor unit connection or outdoor unit connec-  
tions by a soft brush to check for leakage of the con-  
necting points of the piping.  
Evaporator Line  
3-way valve  
(Close)  
3-way valve  
(Open)  
(5) If bubbles come out, the pipes have leakage.  
Cap  
Evacuation  
Hexagonal wrench  
• 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 tub-  
ing length and capacity of the pump. The follow-  
ing table shows the time required for evacuation.  
Required time for evacuation when 4 CMF vacu-  
um pump is used  
if tubing length is longer  
than 10m (33 ft)  
If tubing length is less  
than 10m (33 ft)  
Outdoor unit  
10 min. or more  
15 min. or more  
• When the desired vacuum is reached, close the  
"Lo" knob of the manifold valve and stop the vac-  
uum pump.  
Finishing the job  
• With a service valve wrench, turn the valve stem  
of liquid side valve counter-clockwise to fully  
open the valve.  
Manifold valve  
Pressure  
gauge  
Lo  
Hi  
• Turn the valve stem of gas side valve counter-  
clockwise to fully open the valve.  
• Loosen the charge hose connected to the gas  
side service port slightly to release the pressure,  
then remove the hose.  
Open  
Close  
• 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.  
• Replace the valve caps at both gas and liquid  
side service valves and fasten them tight.  
Vacuum pump  
This completes air purging with a vacuum pump.  
The air conditioner is now ready to test run.  
Service Manual 31  
Installation  
Charging  
■ Each outdoor unit is factory charged (nameplate charge) for the evaporator as well as a 7.5m(25ft)  
line set. Any time a line set is used either shorter or longer then the nominal 7.5m(25ft) 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).  
Standard  
Length  
m(ft)  
Max.  
Max.  
Pipe Size  
Capacity  
(Btu/h)  
Elevation  
length  
Suction  
Evap  
B
m(ft)  
A
m(ft)  
3/8"  
1/2"  
1/2"  
1/2"  
5/8"  
5/8"  
1/4"  
1/4"  
1/4"  
1/4"  
1/4"  
1/4"  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
7.5(25)  
15(49)  
7.5(25)  
7.5(25)  
15(49)  
15(49)  
15(49)  
30(98)  
15(49)  
15(49)  
20(0.22)  
20(0.22)  
20(0.22)  
20(0.22)  
20(0.22)  
20(0.22)  
9k  
12k  
18k  
24k  
Example: A 30ft line set is used  
5 additional ft X 0.22 ounce per foot= add 1.1 ounces of R-410A  
Important:(Unit is critically charged)  
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).  
Confirm the refrigerant R-410A. Use manifold gauge and hose for R-410A.  
32 Room Air Conditioner  
Test Running  
Test Running  
1. Check that all tubing and wiring have been  
properly connected.  
2. Measure the temperature of the intake and discharge  
of air.  
2. Check that the gas and liquid side service  
valves are fully open.  
3. Ensure the difference between the intake tem-  
perature and the discharge is more than  
14.4°F(8°C) (Cooling) or (Heating).  
Prepare remote control  
Intake temperature  
1. Remove the battery cover  
by pulling it according to the  
arrow direction.  
Discharge air  
2. Insert new batteries making  
sure that the (+) and (–) of  
battery are installed correctly.  
Discharge  
temperature  
3. Reattach the cover by  
pushing it back into position.  
4. For reference; the gas side pressure of optimum  
condition is as below.(Cooling)  
NOTE:  
• Use 2 AAA(1.5volt) batteries. Do not use  
rechargeable batteries.  
Outside ambient TEMP.  
The pressure of the gas side service valve  
95°F(35°C)  
8.5~9.5kg/cm2 G(120~135 P.S.I.G.)  
• Remove the batteries from the remote control if  
the system is not going to be used for a long  
time.  
NOTE: 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.  
Settlement of outdoor unit  
I Anchor the outdoor unit with a bolt and  
nut(ø10mm(0.39in) tightly and horizontally on a  
concrete or rigid mount.  
The air conditioner is now ready for use.  
PUMP DOWN  
I 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.  
This is performed when the unit is to be relocated  
or the refrigerant circuit is serviced.  
Pump Down means collecting all refrigerant in the out-  
door unit without loss of refrigerant.  
I In the case when the vibration of the unit is con-  
veyed to the hose, secure the unit with an anti-  
vibration rubber.  
CAUTION:  
Be sure to perform Pump Down procedure with the unit  
cooling mode.  
Bolt  
Pump Down Procedure  
1. Connect a low-pressure gauge manifold hose to the  
charge port on the gas side service valve.  
2. Open the gas side service valve halfway and purge the  
air from the manifold hose using the refrigerant gas.  
3. Close the liquid side service valve(all the way in).  
4. Turn on the unit's operating switch and start the cooling  
operation.  
5. When the low-pressure gauge reading becomes 1 to  
0.5kg/cm2 G(14.2 to 7.1 P.S.I.G.), fully close the gas  
side valve stem and then quickly turn off the unit. At that  
time, Pump Down has been completed and all refriger-  
ant will have been collected in the outdoor unit.  
Tubing connection  
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.  
Service Manual 33  
Operation  
Operation  
Function of Controls  
• DISPLAY  
1) C/O Model  
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)  
Timer Indicator  
• ON while in timer mode (on/off), OFF when timer mode is completed or canceled.  
Comp. Running Incidator  
• While in appliance operation, ON while in outdoor unit compressor running, OFF while in compres-  
sor off.  
2) H/P Model  
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)  
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.  
I 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 in  
compressor not running, operating with the low airflow speed regardless of the setting.  
I Healthy Dehumidification Mode  
• When the dehumidification operation input by the remote control is received, the intake air tempera-  
ture 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 Air Temp<26°C(78.8°F) ➲ Intake Air Temp-1°C(1.8°F)  
18°C(64.4°F) ≤ Intake Air Temp<24°C(75.2°F) ➲ Intake Air Temp-0.5°C(0.9°F)  
Intake Air Temp<18°C(64.4°F)  
➲ 18°C(64.4°F)  
34 Room Air Conditioner  
Operation  
• While in compressor off, the indoor fan repeats low airflow speed and pause.  
• While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehu-  
midification 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.  
I Heating Mode Operation  
• When the intake air temp reaches +3°C(5.4°F) above the setting temp, the compressor is turned  
off. When reaches the setting temp, the compressor is turned on.  
Compressor ON Temp. ➲ Setting Temp.  
Compressor OFF Temp. ➲ Setting Temp.+3°C(5.4°F)  
• While in compressor on, the indoor fan is off when the indoor pipe temp. is below 20°C(68°F), when  
above 28°C(82.4°F) , it operates with the low or setting airflow speed. When the indoor pipe temp is  
between 20°C and 28°C(82.4°F), it operates with Super-Low(while in sleep mode, with the medium  
airflow speed).  
• While in compressor off, the indoor fan is off when the indoor pipe temp is below 33°C(91.4°F),  
when above 35°C(95°F) , it operates with the low airflow speed.  
• If overloaded while in heating mode operation, in order to prevent the compressor from OLP opera-  
tion, the outdoor fan is turned on/off according to the indoor pipe temp.  
• While in defrost control, both of the indoor and outdoor fans are turned off.  
I Defrost Control  
• While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from  
freezing, reversed to cooling cycle to defrost the evaporator pipe of the outdoor unit.  
• After 40 min heating mode operation, at 4 min interval, whether to carry out defrost control or not  
and the time of defrost control are determined according to the following conditions.  
1) While in heating mode operation, the maximum of the indoor pipe temperature is measured and it is  
compared with the present indoor pipe temperature to get the difference of the indoor pipe temper-  
atures (=the maximum temperature of indoor pipe & the present temperature of indoor pipe),  
according to which, whether to carry out defrost control or not is determined.  
2) According to the need of defrost control shown above and the elapsed time of heating mode opera-  
tion at that moment, the defrost control time is determined.  
3) When the determined time of defrost control is below 7 min, heating mode operation continues  
without carrying out defrost control. According to the procedure stated above, the determination is  
made again. When the defrost control time is 7 min or longer, defrost control is then carried out.  
• While in defrost control, the minimum temp of the indoor pipe is measured and it is compared with  
the present temp of the indoor pipe to get the difference of the indoor pipe temperatures (=the pre-  
sent temperature of the indoor pipe & the minimum temperature of the indoor pipe). When the differ-  
ence is 5°C(41°F) or higher, defrost control is completed and heating mode operation is carried out.  
• While in defrost control, if the defrost time determined before the start of defrost control is complet-  
ed, defrost control stops and heating mode operation is carried out regardless of the above condi-  
tion.  
• When the indoor pipe temp is 42°C(107.6°F) or above, defrost control is not carried out even if the  
condition is one of the defrost conditions above.  
• While in defrost control, the compressor is on and the indoor fan, the outdoor fan, and the 4 way  
valve are off.  
Service Manual 35  
Operation  
■■Airflow Speed Selection  
• The airflow speed of the indoor fan is set to high, medium, low, or chaos (auto) by the input of the  
airflow speed selection key on the remote control.  
■■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 tempera-  
ture increases by 1°C(1.8°F). After another 30 min elapse, it increases by 1°C(1.8°F) again.  
• 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.  
■■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 (C/O Model)  
• If the Jet Cool key is input at any operation mode while in appliance operation, the Jet Cool mode  
operates.  
• 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°F)  
• 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.  
■■Jet Cool Mode Operation (H/P Model)  
• 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°F).  
• 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.  
36 Room Air Conditioner  
Operation  
■ Forced operation  
• Operation procedures when the remote control can't be used.  
• The operation will be started if the power button is pressed.  
• If you want to stop operation, re-press the button.  
Heat pump Model  
Cooling Model  
Room Temp. ≥ 24°C(75.2°F) 21°C(69.8°F) ≤ Room Temp. < 24°C(75.2°F) Room Temp. < 21°C(69.8°F)  
Operating mode  
Indoor FAN Speed  
Setting Temperature  
Cooling  
High  
Cooling  
High  
Healthy Dehumidification  
High  
Heating  
High  
22°C(71.6°F)  
22°C(71.6°F)  
23°C(73.4°F)  
24°C(75.2°F)  
• While in forced operation, the key input by the remote control has no effect and the buzzer sounds  
10 times to indicate the forced operation.  
■ Test operation  
•
During the TEST OPERATION, the unit operates in cooling mode at high speed fan, regardless of  
room temperature and resets in 18±1 minutes.  
•
During test operation, if remote controller signal is received, the unit operates as remote controller  
sets.  
If you want to use this operation, open the front panel upward and Press the power button let it be  
pressed for about 3 seconds.  
•
If you want to stop the operation, re-press the button.  
■ Auto restart  
•
In case the power comes on again after a power failure, Auto Restarting Operation is the function to  
operate procedures automatically to the previous operating conditions.  
■ Protection of the evaporator pipe from frosting  
• If the indoor pipe temp is below 0°C in 7 min. after the compressor operates without any pause  
while in cooling cycle operation mode, the compressor and the outdoor fan are turned off in order to  
protect the indoor evaporator pipe from frosting.  
• When the indoor pipe temp is 7°C or higher after 3 min. pause of the compressor, the compressor  
and the outdoor fan is turned on according to the condition of the room temperature.  
■ 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 37  
Operation  
Display Function  
1. Heating Model  
2. Cooling Model  
Operation Indicator  
Operation Indicator  
• Cooling, Soft Dry, Fan, Heating  
• Cooling, Soft Dry, Fan  
Compressor on Indicator  
Deicer Indicator  
• Hot-start, Deice  
Self-diagnosis Function  
Error  
Code  
Error Display LED  
(Indoor body operation LED)  
Error contents  
SVC check point  
• Indoor room temperature  
thermistor open/short  
• Indoor pipe temperature  
thermistor open/short.  
• Indoor Thermistor  
assembly check  
(once)  
1
3sec  
3sec  
3sec  
38 Room Air Conditioner  
Operation  
Remote Control Operations  
The controls will look like the following.  
1. START/STOP BUTTON  
Operation starts when this button is pressed and  
stops when the button is pressed again.  
Signal transmitter  
2. OPERATION MODE SELECTION BUTTON  
Used to select the operation mode.  
3. ROOM TEMPERATURE SETTING BUTTONS  
Used to select the room temperature.  
4. INDOOR FAN SPEED SELECTOR  
Used to select fan speed in four steps  
low, medium, high and CHAOS.  
5. JET COOL  
Used to start or stop the speed cooling.(speed cooling  
operates super high fan speed in cooling mode.)  
5
6
1
3
6. CHAOS SWING BUTTON  
Used to stop or start louver movement and set  
the desired up/down airflow direction.  
7. ON/OFF TIMER BUTTONS  
Used to set the time of starting and stopping operation.  
(See page 22)  
4
10  
2
7
CANCEL  
9
SET  
ON  
OFF  
8. TIME SETTING BUTTONS  
AUTO CLEAN  
12  
11  
8
Used to adjust the time. (See page 22)  
17  
18  
14  
16  
9. TIMER SET/CANCEL BUTTON  
13  
Used to set the timer when the desired time is obtained and  
to cancel the Timer operation. (See page 22)  
15  
10. SLEEP MODE AUTO BUTTON  
Used to set Sleep Mode Auto operation.  
(See page 22)  
11. AIR CIRCULATION BUTTON  
Used to circulate the room air without cooling or heating.  
(See page 23)  
Flip-up door  
(opened)  
12. ROOM TEMPERATURE CHECKING BUTTON  
Operation Mode  
Used to check the room temperature.  
13. NEO PLASMA(OPTIONAL)  
Used to start or stop the plasma-purification function. (See  
page 20)  
Cooling Operation  
Auto Operation or Auto Changeover  
Healthy Dehumidification Operation  
14. HORIZONTAL AIRFLOW DIRECTION CONTROL  
BUTTON (OPTIONAL)  
Used to set the desired horizontal airflow direction.  
15. RESET BUTTON  
Used prior to resetting time.  
Heating Operation  
16. 2nd F Button  
Used prior to using modes printed in blue at the bottom of  
buttons. (See page 21)  
•
Cooling Model( ), Heat Pump Model(  
)
17. AUTO CLEAN (OPTIONAL)  
Used to set Auto Clean mode.  
18. ˚C TO ˚F SWITCHING BUTTON  
Used to switch temperature reading from Centigrade to  
Fahrenheit.  
Service Manual 39  
Operation  
Disassembly  
Indoor Unit  
Disconnect the unit from power supply before mak-  
ing 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.  
1. Before removing the control box, be sure to  
take out the wire screwed at the other end.  
Earth  
Conductor  
40 Room Air Conditioner  
Disassembly  
2. To remove the Control Box.  
• Remove securing screws.  
• Pull the control box out from the chassis  
carefully.  
Screw  
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.  
Service Manual 41  
Disassembly  
• Unhook the tab on the right inside of the chassis  
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.  
Motor cover  
6. To remove the Cross-Flow Fan  
• Loosen the screw securing the cross-flow fan to  
the fan motor (do not remove).  
Bearing  
• Lift up the right side of the cross-flow fan and the  
fan motor, separate the fan motor from the  
cross-flow fan.  
Cross-flow fan  
• Remove the left end of the cross-flow fan from  
the self-aligning bearing.  
42 Room Air Conditioner  
Troubleshooting Guide  
Troubleshooting Guide  
Refrigeration Cycle Diagram  
(1) Cooling Only Models  
INDOOR UNIT  
OUTDOOR UNIT  
LIQUID SIDE  
CAPILLARY TUBE  
HEAT  
HEAT  
EXCHANGE  
(EVAPORATOR)  
EXCHANGE  
(CONDENSER)  
GAS SIDE  
COMPRESSOR  
(2) Cooling & Heating Models  
INDOOR UNIT  
OUTDOOR UNIT  
CHECK VALVE  
(Heating Model only)  
LIQUID SIDE  
3-WAY VALVE  
CAPILLARY TUBE  
HEAT  
HEAT  
EXCHANGE  
(EVAPORATOR)  
EXCHANGE  
(CONDENSER)  
GAS SIDE  
REVERSING  
VALVE  
(Heating Model Only)  
3-WAY VALVE  
ACCUMU  
LATOR  
COOLING  
COMPRESSOR  
HEATING  
Service Manual 43  
Troubleshooting Guide  
2-way, 3-way Valve  
2-way Valve (Liquid Side)  
3-way Valve (Gas Side)  
Valve cap  
Hexagonal wrench (4mm)  
Open position  
Closed position  
Flare nut  
Flare nut  
Open position  
Closed position  
Pin  
To  
To  
piping  
piping  
Service  
port cap  
Service  
port  
connection  
connection  
To outdoor unit  
To outdoor unit  
Works  
Shaft position  
Shaft position  
Service port  
Closed  
(with valve cap)  
Closed  
(with valve cap)  
Closed  
(with cap)  
Shipping  
Air purging  
Open  
Closed  
Open  
1.  
(Installation)  
(counter-clockwise)  
(clockwise)  
(push-pin or with  
vacumm pump)  
Open  
(with valve cap)  
Open  
(with valve cap)  
Closed  
(with cap)  
Operation  
Closed  
(clockwise)  
Open  
Open  
Pumping down  
(Transfering)  
(counter-clockwise) (connected manifold  
gauge)  
2.  
3.  
4.  
Open  
Open  
Open  
Open  
(with charging  
cylinder)  
Evacuation  
(Servicing)  
Open  
Open  
(with charging  
cylinder)  
Gas charging  
(Servicing)  
Open  
Pressure check  
(Servicing)  
(with charging  
cylinder)  
Open  
Open  
Open  
Open  
5.  
6.  
Open  
(with charging  
cylinder)  
Gas releasing  
(Servicing)  
44 Room Air Conditioner  
Troubleshooting Guide  
Pumping Down  
Liquid side  
2-Way  
Indoor unit  
Outdoor unit  
Open  
valve  
Gas side  
Closed  
3-Way  
valve  
Lo  
CLOSE  
Purge the air  
CLOSE  
• Procedure  
(6) Operate the air conditioner at the cooling  
cycle and stop it when the gauge indi-  
cates 1kg/cm2g.  
(1) Confirm that both the 2-way and 3-way  
valves are set to the open position.  
– Remove the valve stem caps and confirm  
that the valve stems are in the raised posi-  
tion.  
(7) Immediately set the 3-way valve to the  
closed position.  
– Be sure to use a hexagonal wrench to  
operate the valve stems.  
– Do this quickly so that the gauge ends up  
indicating 3 to 5kg/cm2g.  
(2) Operate the unit for 10 to 15 minutes.  
(8) Disconnect the charge set, and mount the  
2-way and 3-way valve’s stem nuts and  
the service port nut.  
(3) Stop operation and wait for 3 minutes,  
then connect the charge set to the service  
port of the 3-way valve.  
– Use torque wrench to tighten the service  
port nut to a torque of 1.8 kg.m.  
– Be sure to check for gas leakage.  
– Connect the charge hose with the push pin  
to the service port.  
(4) Air purging of the charge hose.  
– Open the low-pressure valve on the charge  
set slightly to air purge from the charge  
hose.  
Do not use the existing charge set for R-22.  
It is necessary to use new charge set for R-  
410A. The pressure of R-410A is 1.6 times  
higher than that of R-22. Thus, the high pres-  
sure side gauge of charge set should be used  
higher pressure gauge of 50kg/cm2 range.  
(5) Set the 2-way valve to the closed position.  
Service Manual 45  
Troubleshooting Guide  
Balance Refrigerant of the 3-way Valve  
(Gas leakage)  
Liquid side  
Indoor unit  
Outdoor unit  
3-Way  
valve  
Open  
Gas side  
3-Way  
valve  
Open  
Lo  
OPEN  
CLOSE  
• Procedure  
(1) Confirm that both the 2-way and 3-way  
valves are set to the back seat.  
(3) Open the valve (Lo side) on the charge set  
and discharge the refrigerant until the  
gauge indicates 0 kg/cm2G.  
(2) Connect the charge set to the 3-way  
valve’s port.  
– If there is no air in the refrigerant cycle (the  
pressure when the air conditioner is not  
running is higher than 1 kg/cm2G), dis-  
charge the refrigerant until the gauge indi-  
cates 7.1PSI. if this is the case, it will not  
be necessary to apply a evacuatin.  
– Leave the valve on the charge set closed.  
– Connect the charge hose to the service  
port.  
– Discharge the refrigerant gradually; if it is  
discharged too suddenly, the refrigeration  
oil will also be discharged.  
46 Room Air Conditioner  
Troubleshooting Guide  
Evacuation  
(All amount of refrigerant leaked)  
Liquid side  
Indoor unit  
Outdoor unit  
3-Way  
valve  
Open  
Gas side  
3-Way  
valve  
Open  
Vacuum pump  
Lo  
OPEN  
CLOSE  
• Procedure  
(1) Connect the vacuum pump to the center  
hose of charge set center hose  
(3) Close the valve (Lo side) on the charge  
set, turn off the vacuum pump, and con-  
firm that the gauge needle does not move  
(approxima-tely 5 minutes after turning off  
the vacuum pump).  
(2) Evacuation for approximately one hour.  
– Confirm that the gauge needle has moved  
toward -76 cmHg (vacuum of 4 mmHg or  
less).  
(4) Disconnect the charge hose from the vac-  
uum pump.  
– Vacuum pump oil.  
If the vacuum pump oil becomes dirty or  
depleted, replenish as needed.  
Use vacuum pump equipped with check value  
applied to be prevented from flowing backward.  
Service Manual 47  
Troubleshooting Guide  
Gas Charging  
(After Evacuation)  
Liquid side  
3-Way  
Indoor unit  
Outdoor unit  
Open  
valve  
Gas side  
Open  
3-Way  
valve  
Check valve  
Charging  
cylinder  
Lo  
(1)  
OPEN  
CLOSE  
• Procedure  
\
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.  
(1) Connect the charge hose to the charging  
cylinder.  
– Connect the charge hose which you dis-  
connected 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.  
(4) Immediately disconnect the charge hose  
from the 3-way valve’s service port.  
– Stopping partway will allow the gas to be  
discharged.  
(2) Purge the air from the charge hose.  
– Open the valve at the bottom of the cylin-  
der 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.  
– If the system has been charged with liquid  
refrigerant while operating the air condi-  
tioner turn off the air conditioner before  
disconnecting the hose.  
(3) Open the valve (Lo side on the charge set  
and charge the system with liquid refrig-  
erant.  
(5) Mount the valve stem nuts and the service  
port nut.  
– If the system can not be charged with the  
specified amount of refrigerant, it can be  
charged with a little at a time (approximate-  
ly 0.33 lb each time) while operating the air  
conditioner in the cooling cycle; however,  
one time is not sufficient, wait approxi-  
mately 1 minute and then repeat the pro-  
cedure (pumping down-pin).  
– Use torque wrench to tighten the service  
port nut to a torque of 13 lb·ft.  
– Be sure to check for gas leakage.  
This unit is charged with R-410A.  
Pay attention not to charge R-22.  
48 Room Air Conditioner  
Troubleshooting Guide  
Additional gas charging  
(Gas leakage)  
• When refrigerant is insufficient by leakage, recharge the unit with the refrigerant up to normal oper-  
ating suction pressure.  
• Use the graph or the equation below to get operating suction pressure according to indoor and out-  
door temperature.  
Suction pressure was measured at 3-way valve service port after operating the unit for 10 minutes.  
The method of using graph  
- Find outdoor temperature.  
- Find indoor temperature onto the curve of outdoor temperature.  
- Read suction pressure at the axis of ordinates.  
The method of using equation  
-. Calculate suction pressure after putting indoor and outdoor temperature into the equation.  
Operating Suction Pressure (For R410A)  
(According to Indoor & Outdoor Temperature)  
(At operating the Unit for 10 minutes)  
184.9  
122˚F  
170.7  
104˚F  
156.5  
142.2  
128  
86˚F  
68˚F  
50˚F  
0˚F  
113.8  
99.5  
85  
71.1  
41  
50  
59  
68  
77  
86  
95  
104  
Indoor Temp. (˚F)  
Service Manual 49  
Troubleshooting Guide  
Cycle Parts  
Trouble analysis  
1. Check temperature difference between intake and discharge air and operating current.  
Temp. difference : approx. 0°F(0°C)  
• All amount of refrigerant leaked  
out. Check refrigeration cycle.  
Current  
: less than 80% of  
rated current  
Temp. Difference  
Operating Current  
• Refrigerant leakege  
Clog of refrigeration cycle  
Defective compressor  
Temp. difference : approx. 14°F(8°C)  
Current  
: less than 80% of  
rated current  
Temp. difference : less than 14°F(8°C)  
• Excessive amount of refrigerant  
• Normal  
Current  
: over the reated  
current  
Temp. difference : over 14°F(8°C)  
NOTICE  
Temperature difference between intake and discharge air depends on room air humidity. When the room air  
humidity is relativery higher, temperature difference is smaller. When the room air humidity is relatively lower  
temperature difference is larger.  
2. Check temperature and pressure of refrigeration cycle.  
Suction pressure  
(Compared with  
the normal value)  
Temperature  
(Compared with  
the normal valve)  
Cause of Trouble  
Description  
Defective compressor  
Defective 4-way reverse valve  
Current is low.  
High  
Higher  
Excessive amount of  
refrigerant  
High pressure does not quickly  
rise at the beginning of  
operation.  
Normal  
Insufficient amount of  
refrigerant (Leakage)  
Clogging  
Current is low.  
Current is low.  
Lower  
Higher  
NOTICE  
1. The suction pressure is usually 120.9~135.1PSI(Cooling) at normal condition.  
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with  
putty.  
50 Room Air Conditioner  
Troubleshooting Guide  
Electronic Parts (9k model)  
Product does not operate at all.  
(* Refer to Electronic Control Device drawing and Schematic diagram.)  
Turn off Main Power  
(After 20 seconds)  
Turn on Main Power  
Does "beeping" sound is made from the Indoor Unit?  
YES  
NO  
Primarily, the operating condition of Micom is OK.  
Check the voltage of power(About AC 115V, 60Hz)  
• Main power's voltage  
• Voltage applied to the unit  
• Connecting method of Indoor/Outdoor connecting  
cable  
• Check PWB Ass'y(Outdoor unit)  
- Fuse  
Check each load(Indoor/Outdoor Fan Motor,  
Compressor, Stepping Motor) and contacting  
condition of related connector(including connecting  
cable of Indoor/Outdoor Unit)  
- Pattern damage  
- Varistor(ZNR01J)  
Check the connection housing for contacting  
• Connector related to CN-POWER  
• Connector related to CN-FAN  
• Connector contacting of Outdoor Fan/Compressor  
• Display PWB Ass'y Check  
• Connector related to CN-DC/DC  
PCB Board Operation Check  
Content  
Remedy  
Items  
• Power Transformer  
(Outdoor unit)  
±
- Input Voltage  
- Output Voltage  
- About AC115V 10% - Check the power voltage  
• Replace SMPS  
Module  
±
- About DC15V 3  
+
• IC01D(7812) Output  
(Indoor/Outdoor unit)  
• DC 12V  
• Replace IC01D  
+
• IC02D(7805) Output (Indoor unit)  
IC03D(7805) Output (Outdoor unit)  
• DC 5V  
• Replace  
IC02D(Indoor unit)  
IC03D(Outdoor unit)  
• IC01A(KIA7036, Reset IC)  
OSC01B(4MHz)  
(Indoor/Outdoor unit)  
• Voltage of Outdoor unit Micom No. 18,  
Voltage of Indoor unit Micom No. 43 and  
soldering condition  
• Replace faulty parts  
Service Manual 51  
Troubleshooting Guide  
Electronic Parts (18k model)  
Product does not operate at all.  
(* Refer to Electronic Control Device drawing and Schematic diagram.)  
Turn off Main Power  
(After 20 seconds)  
Turn on Main Power  
Does "beeping" sound is made from the Indoor Unit?  
YES  
NO  
Primarily, the operating condition of Micom is OK.  
Check the voltage of power(About AC 208V/AC 230V, 60Hz)  
• Main power's voltage  
• Voltage applied to the unit  
• Connecting method of Indoor/Outdoor connecting  
cable  
• Check PWB Ass'y(Outdoor unit)  
- Fuse  
Check each load(Indoor/Outdoor Fan Motor,  
Compressor, Stepping Motor) and contacting  
condition of related connector(including connecting  
cable of Indoor/Outdoor Unit)  
- Pattern damage  
- Varistor(ZNR01J)  
Check the connection housing for contacting  
• Connector related to CN-POWER  
• Connector related to CN-FAN  
• Connector contacting of Outdoor Fan/Compressor  
• Display PWB Ass'y Check  
• Connector related to CN-DC/DC  
PCB Board Operation Check  
Content  
Remedy  
Items  
• Power Transformer  
(Outdoor unit)  
±
- Input Voltage  
- Output Voltage  
- About AC 208V/AC 230V 10%  
• Replace SMPS  
Module  
- Check the power voltage  
±
- About DC15V 3  
• IC01D(7812) Output  
(Indoor/Outdoor unit)  
• Replace IC01D  
+
• DC 12V  
• IC02D(7805) Output (Indoor unit)  
IC04D(7805) Output (Outdoor unit)  
• Replace  
IC02D(Indoor unit)  
IC04D(Outdoor unit)  
+
• DC 5V  
• IC01A(KIA7036, Reset IC)  
OSC01B(4MHz)  
(Indoor/Outdoor unit)  
• Voltage of Outdoor unit Micom No. 18,  
Voltage of Indoor unit Micom No. 43 and  
soldering condition  
• Replace faulty parts  
52 Room Air Conditioner  
Troubleshooting Guide  
The product is not 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.  
(When operated in the Sleeping Mode, the wind speed is set to the  
low speed by force.)  
Caused by other parts except the remote controller  
Cause by the remote controller  
When the mark(  
battery.  
) is displayed in LCD screen, replace  
Check the contact of CN-DISP connector.  
When the detect switch(double key) inside the remote  
controller door is fault, it is impossible to operate  
Check DISP PWB Ass'y  
- Voltage between CN DISP  
+
-
: DC 5V  
temperature regulating(  
/
) and wind speed selecting.  
Check the connecting circuit between the remote controller  
MICOM (No. ) - R17(2Ω) - IR LED - Q1 - R16(2.2KΩ).  
Check point  
• Check the connecting circuit between PIN 43 -  
R11L(1K) - C11L(680PF) - MICOM PIN  
• Check Receiver Ass'y  
Service Manual 53  
Troubleshooting Guide  
Compressor/Outdoor Fan are unable to drive.(9k Model)  
Turn on Main Power  
Operate "Cooling Mode( )" by setting the desired temperature of the  
remote controller is less than one of the indoor temperature by 2°F at least.  
When in Fan Mode, Compressor/Outdoor Fan is stopped.  
Check the sensor for indoor temperature is attached as close as to be  
effected by the temperature of Heat Exchanger(EVA).  
When the sensor circuit for indoor temperature and connector are in bad  
connection or are not engaged, Compressor/Outdoor Fan is stopped.  
• Check the related circuit of R02H(12.1K), R04H(6.2K), Micom (No.27)  
(Indoor unit).  
• Check the indoor temperature sensor is disconnected or not(About 10kΩ / at 77°F).  
When the temperature around Outdoor PWB Ass'y is above 163°F the  
compressor is stop and only Outdoor Fan is operating.  
Check Relay(RY - COMP) for driving compressor.  
• When the power(About AC110V) is applied to the connecting wire termi-  
nal support transferred to compressor, PWB Ass'y is normal.  
• Check the circuit related to the relay(Outdoor unit).  
Check point  
Between Micom(No.  
5) and GND  
COMP ON  
COMP OFF  
DC5V  
DC0V  
Between IC01M, IC02M(No. 9)  
and IC01M, IC02M(No. 8)  
Below DC 1V  
(app)  
About DC12V  
Turn off Main Power  
• Check the electrical wiring diagram of outdoor side.  
• Check the abnormal condition for the component of Compressor/Outdoor  
Fan Motor.  
54 Room Air Conditioner  
Troubleshooting Guide  
Compressor/Outdoor Fan are unable to drive.(18k Model)  
Turn on Main Power  
Operate "Cooling Mode( )" by setting the desired temperature of the  
remote controller is less than one of the indoor temperature by 2°F at least.  
When in Fan Mode, Compressor/Outdoor Fan is stopped.  
Check the sensor for indoor temperature is attached as close as to be  
effected by the temperature of Heat Exchanger(EVA).  
When the sensor circuit for indoor temperature and connector are in bad  
connection or are not engaged, Compressor/Outdoor Fan is stopped.  
• Check the related circuit of R02H(12.1K), R04H(6.2K), Micom (No.27)  
(Indoor unit).  
• Check the indoor temperature sensor is disconnected or not(About 10kΩ / at 77°F).  
When the temperature around Outdoor PWB Ass'y is above 163°F the  
compressor is stop and only Outdoor Fan is operating.  
Check Relay(RY - COMP) for driving compressor.  
• When the power(About AC200V) is applied to the connecting wire termi-  
nal support transferred to compressor, PWB Ass'y is normal.  
• Check the circuit related to the relay(Outdoor unit).  
Check point  
Between Micom(No.  
5, 6) and GND  
COMP ON  
COMP OFF  
DC5V  
DC0V  
Between IC01M, IC02M(No. 9)  
and IC01M, IC02M(No. 8)  
Below DC 1V  
(app)  
About DC12V  
Turn off Main Power  
• Check the electrical wiring diagram of outdoor side.  
• Check the abnormal condition for the component of Compressor/Outdoor  
Fan Motor.  
Service Manual 55  
Troubleshooting Guide  
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 56  
Does the voltage of terminal of CN-DC/DC CONNECTOR in  
Check connecting condition of the CN-MOTOR CON-  
Indoor unit corresponds to the values in the table of page 56  
NECTOR  
Do the voltage of terminal of  
Check the pattern and the  
CN-DC/DC CONNECTOR in  
condition of Indoor unit PWB  
Outdoor unit corresponds to the  
Ass'y.  
Check the interference of Indoor Fan.  
values in the table of page 56  
NO  
Check the connecting condi-  
Check the patterns and the  
tion and disconnection of  
Check the motor of Indoor Fan  
conditions of outdoor unit  
connecting wires between  
PWB Assy's.  
Indoor and Outdoor unit.  
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)  
56 Room Air Conditioner  
Troubleshooting Guide  
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 2 , 3 , 4 and 5 of IC01M  
- Between 12 , 13 , 14 , 15 of IC01M  
- Between 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 57  
Troubleshooting Guide  
When a comunication error occurs.  
• The operation indicator of Indoor unit blinks five times.  
• The red indicator of Outdoor unit blinks five times.  
Check the connecting wires between Indoor and Outdoor unit for the  
connecting error and the contacting condition.  
Check the installation condition of outdoor unit.  
Check for the communication error and the operating condition of product  
after also operating with the remote controller, then taking above 2 minutes.  
Apply the power again after about 20 seconds by the power of Outdoor unit  
is off.  
Check for the communication error and the operating condition of product  
after also operating with the remote controller, then taking above 2 minutes.  
Check the PWB assembly of Indoor and Outdoor unit.  
If the connecting wires of Indoor and Outdoor unit are not connected within 2 minutes after the power of  
Outdoor unit is applied, a communication error will occur. Therefore, the power should be applied after connect-  
ing them.  
58 Room Air Conditioner  
Troubleshooting Guide  
The phenomena in case of connecting error  
INDOOR UNIT  
Connector Type  
CN-DC/DC  
Phenomena  
Condition  
Open and connecting error  
• The same as the phenomenon of Outdoor Unit.  
Blue  
Black  
Brown  
Red  
• The indoor fan does not operate.  
• The operation indicator of Indoor unit blinks 8 times.  
CN-MOTOR  
Open  
Open  
Short between terminals  
Open  
• The up/down vane does not operate.  
CN-UP/DOWN  
CN-DISP  
• The up/down vane does not smoothly operate.  
• It does not operate with a remote controller.  
• The operation indicator blinks once.  
On for 0.5 second  
Open  
Off for 3 seconds  
• The compressor and the outdoor fan stop.  
• The indoor fan speed is low.  
CN-TH  
• The operation indicator blinks once  
(on for 0.5 second, off for 3 seconds).  
• The compressor operates continuously regardless  
of the setting temperature and the variation of room  
temperature.  
Short between terminals  
(
and ) of ROOM-TH.  
• The operation indicator blinks once  
(on for 0.5 second, off for 3 seconds)  
• Continuous operation  
Short between terminals  
(
and ) of PIPE-TH.  
Service Manual 59  
Troubleshooting Guide  
OUTDOOR UNIT  
Connector Type  
Phenomena  
Condition  
• All functions stop.  
• The operation with the remote controller, forced and  
test one do not operate.  
OPEN  
CN-POWER  
Connecting reversely  
• PWB pattern is damaged when applying the power.  
• All functions stop or the compressor does not operate.  
• The operation with the remote controller, forced and test  
one do not operate.  
OPEN  
RY-COMP  
terminal  
• All functions stop.  
• The operation with the remote controller, forced and test  
one do not operate.  
Connecting reversely  
• All functions stop.  
• The operation with the remote controller, forced and  
test one do not operate.  
OPEN  
OPEN  
OPEN  
CN-TRANS  
CN-FAN  
• The Indoor Fan does not operate.  
• All functions stop.  
• The operation with the remote controller, forced and test  
one do not operate.  
The connecting  
wire of CN-  
DC/DC, and  
Indoor and  
• The only signal of remote controller operation/stop is  
inputted, but the product does not operate.  
• The RED indicator of outdoor unit blinks 5 times after 2  
minutes with applying the power.  
Connecting error  
Outdoor Unit  
(
)
• The beep sound, such as "beep, beep, beep, beep,  
beep", occurs periodically in Indoor unit.  
• The signal input of a remote controller and operation of  
product is impossible.  
• The RED indicator blinks 5 times after 2 minutes with  
applying the power.  
Blue  
Connecting error  
Black  
Brown  
Red  
(
)
• The signal of remote controller is inputted, but the  
product does not operate.  
• The RED indicator of outdoor unit and the operation  
indicator of indoor one blinks 5 times after 2 minutes  
with applying the power.  
Connecting error  
(
)
• No power for Indoor unit.  
• The signal input of the remote controller and opera-  
tion of product is impossible.  
• The thermal protector of the Power Trans operates  
when let it alone for long time.  
Connecting error  
(
)
• The signal of the remote controller is inputted.  
• The fuse and Q61 in the Outdoor unit are damaged  
when the indoor fan is operated.  
Connecting error  
(
)
• No power for Indoor unit.  
• The signal input of the remote controller and opera-  
tion of product is impossible.  
• The RED indicator of the Outdoor unit blinks 5 times  
after 2 minutes with applying the power.  
Connecting error  
(
)
60 Room Air Conditioner  
Schematic Diagram  
Schematic Diagram  
Electric Control Device  
■ Indoor  
Service Manual 61  
Schematic Diagram  
■ Outdoor (9k, 12k)  
62 Room Air Conditioner  
Schematic Diagram  
■ Outdoor (18k, 24k)  
Service Manual 63  
Schematic Diagram  
Wiring Diagram  
■■Indoor Unit  
Models: 9k, 12k, 18k, 24k  
64 Room Air Conditioner  
Schematic Diagram  
■■Outdoor Unit  
Models: 9k(C/O)  
Models: 12k(H/P), 12k(C/O, H/P)  
Service Manual 65  
Schematic Diagram  
Models: 18k(C/O)  
Models: 18k(H/P), 24k(C/O, H/P)  
66 Room Air Conditioner  
Schematic Diagram  
Components Location  
■■Indoor  
MAIN P.W.B ASSEMBLY  
• TOP VIEW  
• BOTTOM VIEW  
Service Manual 67  
Schematic Diagram  
■ Outdoor(9k, 12k)  
• TOP VIEW  
• BOTTOM VIEW  
68 Room Air Conditioner  
Schematic Diagram  
■ Outdoor(18k, 24k)  
• TOP VIEW  
• BOTTOM VIEW  
Service Manual 69  
Schematic Diagram  
DISPLAY ASSEMBLY  
– 6870A90240D  
– 6870A90240E  
70 Room Air Conditioner  
Product Specifications  
Product Specifications  
Cooling Only  
Model Name  
DMC09SB-0  
DMC12SB-0  
DMC18SB-1  
DMC24SB-1  
Item  
Unit  
Power Supply  
Cooling Capacity  
Input  
Running Current  
COMP. Locked Rotor AMP.  
S.E.E.R  
Air Circulation  
Moisture Removal  
Noise Level  
Ø, V, Hz  
BTU/h  
1, 115V, 60  
9,000  
1, 115V, 60  
11,500  
1,150  
10.5  
57  
13  
9.3(330)  
1.4(3.0)  
41  
1, 230/208, 60  
18,000/17,800  
1,940  
8.6/9.5  
25*2  
13  
13.0(460)  
2.5(5.3)  
41  
1, 230/208 , 60  
22,100/22,500  
2,250  
12.5/11.5  
29+33  
W
A
A
780  
7
50  
13  
7.1(250)  
1.2(2.6)  
36  
13  
m3G/min(cfm)  
l/h(pts/hr)  
dB(A)  
15(530)  
3.1(6.6)  
46  
Indoor, High  
(Sound Pressure, 1m) Med  
Low  
dB(A)  
dB(A)  
31  
28  
36  
34  
36  
35  
41  
38  
Outdoor, Max  
dB(A)  
48  
48  
55  
57  
Features  
Temperature Control  
Air Deflection  
Thermistor  
4-way  
themistor  
4-way  
Thermistor  
4-way  
themistor  
4-way  
Steps, Fan/Cool  
3/3  
3/3/3  
3/3  
3/3/3  
Air Deflection Control(up&down)  
Air Deflection Control(left&right)  
Remocon Type  
Setting Temperature Range, Cooling Mode  
Temperature Increment  
Auto Operation(electronic control)  
Self Diagnosis  
Auto  
Auto  
Wireless LCD  
64~86°F  
2°F(1°C)  
Yes  
auto  
auto  
Wireless LCD  
64~86°F  
2°F(1°C)  
Yes  
Auto  
Auto  
Wireless LCD  
64~86°F  
2°F(1°C)  
Yes  
auto  
auto  
Wireless LCD  
64~86°F  
2°F(1°C)  
Yes  
Yes  
Yes  
Yes  
Yes  
Timer  
Sleep Operation  
24hr , On/Off  
Yes  
24hr , on/off  
Yes  
24hr , On/Off  
Yes  
24hr , on/off  
Yes  
Healthy Dehumidification Mode  
Yes  
Yes  
Yes  
Yes  
Restart Delay  
minutes  
g(oz)  
AWG#:P*mm2  
A
3
3
3
3
Refrigerant(R-410a) Charge  
Power cord  
600(21.1)  
14:3*2.5  
15  
930(32.8)  
14:3*2.5  
20  
850(30.0)  
14:3*2.5  
20  
1750(61.7)  
12:3Åñ2.5  
30  
Fuse of breaker Capacity  
Connecting Cable  
Connecting Tube  
(Ø, Socket Flare)  
AWG#:P*mm2  
mm(in)  
mm(in)  
m(ft)  
18:4*0.75  
6.35(1/4)  
9.52(3/8)  
7.5(25)  
15.5(5/8)  
840*270*153  
33-1/16*10-5/8*6-1/32  
770*541*244  
30-5/16*21-5/16*9-5/18  
7.0(15.4)  
30(66.1)  
18:4*0.75  
6.35(1/4)  
12.7(1/2)  
7.5(25)  
15.5(5/8)  
895*282*165  
35.2*11.1*6.5  
770*541*244  
30-5/16*21-5/16*9-5/8  
9.3(20.5)  
33(72.8)  
18:4*0.75  
6.35(1/4)  
12.7(1/2)  
7.5(25)  
15.5(5/8)  
1090*300*178  
18:4*0.75  
6.35(1/4)  
15.88(5/8)  
7.5(25)  
15.5(5/8)  
1090*300*178  
Liquid Side  
Gas Side  
Length, std  
Additional Drain Hose(outer Dia.)  
Dimensions  
(WxHxD)  
mm(in)  
mm  
in  
mm  
Indoor  
42-15/16*11-13/16*7-1/32 42-15/16*11-13/16*7-1/32  
Outdoor  
871*655*320  
34-5/16*25-13/16*12-5/8  
13.0(28.6)  
871*800*320  
34-5/16*31-1/2*12-5/8  
13(28.6)  
in  
Net Weight  
Indoor  
Outdoor  
Kg(lbs)  
Kg(lbs)  
68.1(149.9)  
77(169.6)  
* Design and specifications subject to change without prior notice for product improvement.  
Service Manual 71  
Product Specifications  
Cooling & Heating  
Items  
Power Supply  
Cooling Capacity  
Heating Capacity  
Unit  
ø, V, Hz  
BTU/h  
BTU/h  
W
W
A
A
A
DMH09SB-0  
1, 115V, 60  
9,800  
DMH12SB-0  
1, 115V, 60  
11,500  
11,500  
1,150  
DMH18SB-1  
1, 230/208 , 60  
19,000/19,500  
19,000/19,500  
2,250  
DMH24SB-1  
1, 230/208 , 60  
22,100/22,500  
22,100/22,500  
2,250  
9,800  
980  
980  
9.5  
9.5  
57  
57  
13  
Input  
Cooling  
Heating  
Cooling  
Heating  
Cooling  
Heating  
1,150  
10.5  
10.5  
57  
57  
13  
2,700  
2,700  
12.5/11.5  
12.5/11.5  
29+33  
29+33  
13  
12.5/11.5  
12.5/11.5  
29+33  
29+33  
13  
Running Current  
COMP. Locked  
Rotor AMP.  
S.E.E.R  
A
7.8  
7.8  
7.8  
7.8  
H.S.P.E  
Air Circulation  
Moisture Removal  
Noise Level  
(Sound  
m3/min(cfm)  
l/h(pts/hr)  
dB(A)  
9.3(330)  
1.4(3.0)  
41  
9.3(330)  
1.4(3.0)  
41  
15(530)  
3.1(6.6)  
46  
15(530)  
3.1(6.6)  
46  
Indoor, High  
Med  
36  
36  
41  
41  
dB(A)  
34  
34  
38  
38  
Pressure, 1m)  
Low  
dB(A)  
48  
themistor  
4-way  
48  
themistor  
4-way  
57  
themistor  
4-way  
57  
themistor  
4-way  
Outdoor, Max  
Temperature Control  
Air Deflection  
Steps, Fan/Cool/Heat  
dB(A)  
Features  
3/3/3  
3/3/3  
3/3/3  
3/3/3  
auto  
auto  
auto  
auto  
auto  
auto  
auto  
auto  
Airflow Direction Control(up&down)  
Airflow Direction Control(left&right)  
Remocon Type  
Setting Temperature Range, Cooling Mode  
Heating Mode  
Temperature Increment  
Auto Operation(electronic control)  
Self Diagnosis  
Wireless LCD  
64~86°F  
60~86°F  
2°F(1°C)  
Yes  
Wireless LCD  
64~86°F  
60~86°F  
2°F(1°C)  
Yes  
Wireless LCD  
64~86°F  
60~86°F  
2°F(1°C)  
Yes  
Wireless LCD  
64~86°F  
60~86°F  
2°F(1°C)  
Yes  
Yes  
Yes  
Yes  
Yes  
24hr , on/off  
Yes  
24hr , on/off  
Yes  
24hr , on/off  
Yes  
24hr , on/off  
Yes  
Timer  
Sleep Operation  
Yes  
Yes  
Yes  
Yes  
Healthy Dehumidification Mode  
3
Yes  
Yes  
3
Yes  
Yes  
3
Yes  
Yes  
3
Yes  
Yes  
Restart Delay  
Defrost Control  
Hot Start  
minutes  
930(32.8)  
14:3*2.5  
20  
930(32.8)  
14:3*2.5  
20  
1750(61.7)  
12:3*2.5  
30  
1750(61.7)  
12:3*2.5  
30  
Refrigerant(R410A) Charge  
Power cord  
Fuse or breaker Capacity  
Connecting Cable  
g(oz)  
AWG #: P*mm2  
A
AWG #: P*mm2  
mm(in)  
mm(in)  
m(ft)  
18:4*0.75  
6.35(1/4)  
12.7(1/2)  
7.62(25)  
15.5(5/8)  
895*282*165  
35.2*11.1*6.5  
770*541*244  
30-5/16*21-5/16*9-5/8  
9.3(20.5)  
33(72.8)  
18:4*0.75  
6.35(1/4)  
12.7(1/2)  
7.62(25)  
15.5(5/8)  
895*282*165  
35.2*11.1*6.5  
770*541*244  
30-5/16*21-5/16*9-5/8  
9.3(20.5)  
33(72.8)  
18:4*0.75  
6.35(1/4)  
15.88(5/8)  
7.62(25)  
15.5(5/8)  
1090*300*178  
42-15/16*11-13/16*7-1/32  
871*800*320  
34-5/16*31-1/2*12-5/8  
13(28.6)  
77(169.6)  
18:4*0.75  
6.35(1/4)  
15.88(5/8)  
7.62(25)  
15.5(5/8)  
1090*300*178  
42-15/16*11-13/16*7-1/32  
871*800*320  
34-5/16*31-1/2*12-5/8  
13(28.6)  
77(169.6)  
Connecting Tube  
(ø. Socket Flare)  
Liquid Side  
Gas Side  
Length, std  
Additional Drain Hose(Outer Dia.)  
mm(in)  
mm  
in  
Dimensions  
(WxHxD)  
Outdoor  
Indoor  
mm  
770*540*245  
in  
kg(lbs)  
33(72.8)  
Net Weight  
Outdoor  
Indoor  
kg(lbs)  
* Design and Specifications subject to change without prior notice for product improvement.  
72 Room Air Conditioner  
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.:3828A20390T  

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