HEAT CONTROLLER, INC.
Wall Mounted
Multi-Split System
Air Conditioning/Heat Pump
DMH18DB-1
Before servicing the unit, read the
“safety precautions” in this manual.
Only for authorized service personnel.
Combination table
Combination table
Cooling
Heating
Combination of Indoor Unit(kBtu/h)
Operation
Each Capacity
Total Capacity
Each Capacity
Total Capacity
Unit-A
9
Unit-B
Total
9
UNIT-A(Btu/h) UNIT-B(Btu/h)
Btu/h
9000
kW
UNIT-A(Btu/h) UNIT-B(Btu/h)
Btu/h
9000
kW
9000
9000
-
2.63
5.27
9000
9000
-
2.63
1 Unit
2 Unit
9
9
18
9000
18000
9000
18000
5.27
Notes :
1.Cooling Capacity is based on : indoor temp. 26.7°C(80.1°F)DB, 19.4°C(66.9°F)WB; outdoor temp. 35°C(95°F)DB, 23.9°C(75°F)WB
2.Heating Capacity is based on : indoor temp. 21.1°C(70°F)DB, 15.6°C(60.1°F)WB; outdoor temp. 8.3°C(46.9°F)DB, 6.1°C(43°F)WB
3.The total ability of connected a indoor unit is up to 18k Btu/h
Symbols Used in this Manual
This symbol alerts you to the risk of electric shock.
This symbol alerts you to hazards that could cause harm to the
air conditioner.
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.
I 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.
I Meanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
WARNING
I 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
I 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
I 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(S4)
9 kBtu/h
Dimension
W
H
mm(in)
mm(in)
mm(in)
870(34.2)
270(10.6)
153(6)
D
10 Multi type Air Conditioner
Dimensions
Outdoor Unit
W
L6
L5
L7
MODEL
UE
18kBtu/h
DIM
W
mm(in)
870(34.3)
655(25.8)
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
Outdoor Unit
A-DMH18DB-1
Nominal Capacity
(Min~Rating~Max)
Cooling
kW
Btu/h
kW
5.27
18000
5.27
Heating
Btu/h
kW
kW
18000
1.98
1.96
A2NH093GCA0
Nominal Input
(Min~Rating~Max)
Testing Combination
Cooling
Heating
Running Current(Rating) Cooling
Heating
A
A
8.8
8.6
Starting Current
Cooling/Heating
A
13
Power Supply
Ø / V / Hz
1/208~230/60
3*2.5
Power Supply Cable(Outdoor)
Power and Transmission Cable
(Outdoor to Indoor or Outdoor to BD)
Power and Transmission Cable(BD to Indoor)
Dimensions
Net Weight
No. x mm2
No. x mm2
4*0.75
No. x mm2
mm(inch)
kg(lbs)
-
W x H x D
870*655*320(34.3*25.8*12.6)
60(132.2)
Max. Number of Connectable Indoor Units
2
Compressor (#1)
Compressor (#2)
Compressor (#3)
Refrigerant
Type
Qty x Model
Motor type
Oil charge volume
Oil Type
Type
Qty x Model
Motor type
Oil charge volume
Oil type
Type
Qty x Model
Motor type
Rotary(Non Tropical)
1*GK113KAA
Induction Motor
330
FVC68D
Rotary(Non Tropical)
cc
cc
cc
1*GK094KAA
Induction Motor
330
FVC68D
-
-
-
-
Oil charge volume
Oil type
Cycle A Charge (at 7.5m)
Cycle B Charge (at 7.5m)
Type
-
g(oz)
g(oz)
1400(49)
-
R410A
Control
EEV
Additional Refrigerant Charge
g/m(oz/ft)
µF/Vac
20(0.22)
(2R X 28C X 18) X 1
Reversing Cycle
6/370
Heat Exchanger
(Rows x Column x FPI) x No.
Defrosting Method
Capacitor
Fan
Drive
Direct Drive
Side
50(1765.7)
51
6.35(1/4)
9.52(3/8)
-
Discharge Direction(Side/Top)
Air Flow Rate x No. of Fan
Sound Pressure
Liquid(Cycle A)
Gas(Cycle A)
Liquid(Cycle B)
Gas(Cycle B)
High Pressure Gas
Total Piping
CMM(cfm)
dB(A)+3
mm(inch)
mm(inch)
mm(inch)
mm(inch)
mm(inch)
m(ft)
m(ft)
m(ft)
m(ft)
m(ft)
Sound Level(H/L)
Piping Connections
-
-
Max. Interunit
Piping Length
30(98.4)
15(49.2)
-
Main Piping
Total Branch Piping
Each Branch Piping
Outdoor Unit~Indoor Unit
Indoor Unit~Indoor Unit
Cooling
7.5(24.6)
7.5(24.6)
7.5(24.6)
21~43(69.8~109.4)
-5~24(23~75.2)
Max. Elevation
Difference
Operation Range
(Outdoor)
m(ft)
˚C(˚F)
˚C(˚F)
Heating
Note:
1. Capacities are based on the following conditions:
2. Wiring cable size must comply with the applicable local and national code.
3. The specification may be subject to change without prior notice for purpose
of improvement.
Cooling:
- Indoor Temperature 26.7˚C(80˚F) DB/19.4˚C(67˚F) WB
- Outdoor Temperature 35˚C(95˚F) DB/23.9˚C(75˚F) WB
- Indoor Temperature 21.1˚C(70˚F) DB/15.6˚C(60˚F) WB
- Outdoor Temperature 8.3˚C(47˚F) DB/6.1˚C(43˚F) WB
Heating:
Piping Length - Interconnecting Piping Length 7.5m
- Level Difference of Zero
12 Multi type Air Conditioner
Product Specifications
Indoor Unit
B-DMH18DB-1
Power Supply
Cooling Capacity
Ø / V / Hz
kW
1/208~230/60
2.63
Btu/h
kW
9000
2.63
Heating Capacity
Btu/h
A
9000
0.5
BLDC
Current
Fan
Nominal Running Current
Motor Type
Fan Type
Cross Flow fan
Motor Output(W) x No. of Unit
Air Flow Rate
(H / M / L)
15*1
7
247.1
CMM
cfm
External Static Pressure
Capacitor
mmAq
µF / Vac
-
-
Drive
Row x Column x FPI
Direct drive
2*15*20
Coil
Dimensions (W x H x D) Body
Decorative Panel
Body
mm(inch)
mm(inch)
kg (lbs)
870*270*153(34.2*10.6*6)
-
7(15.4)
Net Weight
Decorative Panel
kg (lbs)
-
Air Filter
Sound Level (H / M / L)
Piping Connections
Long life filter
31/27/21
6.35(1/4)
9.52(3/8)
20/13
dB(A)+3
mm (inch)
mm (inch)
mm
Liquid
Gas
Drain(OD/ID)
Dehumidification Rate
Safety Devices
l/h
1.2
Fuse
Temperature Sensor
Referigerant
Referigerant Control
Connectable Outdoor Unit
Thermistor
R-410A
EEV(Outdoor Unit)
Multi
Power and Transmission Interunit Cable
No. x mm2
4*0.75
Note:
1. Capacities are based on the following conditions:
Cooling:
- Indoor Temperature 26.7˚C(80˚F) DB/19.4˚C(67˚F) WB
- Outdoor Temperature 35˚C(95˚F) DB/23.9˚C(75˚F) WB
- Indoor Temperature 21.1˚C(70˚F) DB/15.6˚C(60˚F) WB
- Outdoor Temperature 8.3˚C(47˚F) DB/6.1˚C(43˚F) WB
Heating:
Piping Length - Interconnecting Piping Length 7.5m
- Level Difference of Zero
2. Wiring cable size must comply with the applicable local and national code.
3. The specification may be subject to change without prior notice for purpose of improvement.
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 30cm
(11.8 inch)
2. Select a place where there are no obstacles in front
of the unit.
More than 20cm
(7.9 inch)
3. Make sure that condensation drainage can be conve-
niently routed away.
4. Do not install near a doorway.
5. Ensure the spaces indicated by arrows from the wall,
ceiling, fence or other obstacles.
More than 30cm
(11.8 inch)
6. Use a stud finder to locate studs to prevent unneces-
sary damage to the wall.
Outdoor unit
1. If an awning is built over the unit to prevent direct
sunlight or rain exposure, make sure that heat 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)
more than 60cm
(23.6 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)
18k
all pipes (A+B)
pipe (A/B)
pipe (A/B)
5m(16ft)
Pipe Size
30m(100ft)
15m(50ft)
7.5m(25ft)
7.5m(25ft)
Indoor Capacity
(Btu/h)
Gas
Liquid
Standard Length
Additional Refrigerant
20g/m(0.22oz/ft)
9k
9.52mm(3/8")
6.35mm(1/4")
7.5m(25ft)
A
h2
B
h1
h1
B
CAUTION: Capacity is based on standard length and maximum allowance length is on the
basis of reliability.
16 Multi type Air Conditioner
Installation
Fixing 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" 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.
Distance (mm/inch)
CHASSIS
(Grade)
A
B
C
D
S4
50(1.97) 105(4.13) 59(2.32) 105(4.13)
Installation plate
B
D
A
C
Ø70mm
Ø70mm
(Ø2.75inch)
(Ø2.75inch)
Left rear piping
Right rear piping
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.
Copper
pipe
Slanted Uneven Rough
2. Measure the distance between the indoor and the out-
door unit.
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
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 dropping
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 Bar in the dimension shown
in the table below.
Handle
Yoke
Bar
Bar
Outside diameter
A
Cone
mm
Ø6.35
Ø9.52
inch
1/4
3/8
mm
1.1~1.3
1.5~1.7
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.
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 illustra-
tion) and pull the tubing and drain hose away from
chassis.
3. Replace the plastic holder in original position.
For right rear piping
1. Route the indoor tubing and the drain hose in the
direction of rear right.
2. Insert the connecting cable into the indoor unit from the
outdoor unit through the piping hole.
• Do not connect the cable to the indoor unit.
• Make a small loop with the cable for easy connec-
tion later.
Drain hose
3. Tape the tubing, drain hose, and the connecting
cable. Be sure that the drain hose is located at the
lowest side of the bundle. Locating at the uper side
can cause drain pan to overflow inside the unit.
If the drain hose is routed inside the room, insulate the
hose with an insulation material* so that dripping from
"sweating"(condensation) will not damage furniture or
floors.
Tape
Connecting
pipe
*Foamed polyethylene or equivalent is recommended.
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
installation plate.(Engage the two hooks of the rear
top of the indoor unit with the upper edge of the
installation plate.) Ensure that the hooks are properly
seated on the installation plate by moving it left and
right.
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.
Indoor unit tubing
Flare nut Pipes
1. Align the center of the pipes and sufficiently tighten
the flare nut by hand.
2. Tighten the flare nut with a wrench.
Open-end wrench (fixed)
Outside diameter
Torque
Flare nut
.
mm
Ø6.35
Ø9.52
inch
1/4
3/8
kgf m(lbf-ft)
1.8~2.5(13)
3.4~4.2(30)
Wrench
Connection pipe
Indoor unit tubing
3. When extending the drain hose at the indoor unit,
install the drain pipe.
Drain pipe
Indoor unit drain hose
Vinyl tape(narrow)
Adhesive
Wrap the insulation material around the connecting
portion.
Plastic bands
Insulation material
1. Overlap the connection pipe insulation material and
the indoor unit pipe insulation material. Bind them
together with vinyl tape so that there may be no gap.
2. Wrap the area which accommodates the rear piping
housing section with vinyl tape.
Indoor unit pipe
Wrap with vinyl tape
Connection pipe
Vinyl tape (wide)
Connecting cable
Pipe
3. Bundle the piping and drain hose together by wrap-
ping them with vinyl tape for enough to cover where
they fit into the rear piping housing section.
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
Connecting
cable
2. Insert the piping, drain hose, and the connecting
cable into the piping hole.
3. Insert the connecting cable into the indoor unit.
• Don't connect the cable to the indoor unit.
• Make a small loop with the cable for easy connec-
tion 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
Open-end wrench (fixed)
.
mm
Ø6.35
Ø9.52
inch
1/4
3/8
kgf m(lbf-ft)
1.8~2.5(13)
3.4~4.2(30)
Flare nut
Wrench
Connection pipe
Indoor unit tubing
3. When extending the drain hose at the indoor unit,
install the drain pipe.
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
portion.
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
housing 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 wrap-
ping 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.
Piping for
passage through
piping hole
Indoor unit installation
1. Remove the spacer.
2. Ensure that the hooks are properly seated on the
installation plate by moving it left and right.
Connecting
cable
3. Press the lower left and right sides of the unit against
the installation plate until the hooks engage into their
slots(clicking sound).
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.
A-UNIT
Gas side piping
Outside diameter
Torque
.
mm
Ø6.35
Ø9.52
inch
1/4
3/8
kgf m(lbf-ft)
1.8~2.5(13)
3.4~4.2(30)
B-UNIT
Liquid side piping
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 individu-
ally according to the outdoor unit connection. (Ensure that the color of the wires of the outdoor unit and the ter-
minal No. are the same as those of the indoor unit.)
The earth wire should be longer than the common wires.
The circuit diagram is not subject to change without notice.
When installing, refer to the electrical diagram behind the front panel of Indoor Unit.
The wiring for the outdoor unit can be found on the inside of the Outdoor Unit control cover.
WARNING:
• The circuit diagram is not subject to change without notice.
• Be sure to connect wires according to the wiring diagram.
• Connect the wires firmly, so that not to be pulled out easily.
• Connect the wires according to color codes by referring to the wiring diagram.
WARNING: Provide a circuit breaker
Main power source
between power source and the out-
door unit as shown below.
Air
Circuit Breaker
Conditioner
Use a circuit breaker
or time delay fuse.
WARNING! : The power wire to the outdoor unit must be of sufficient gauge to meet the
Minimum Circuit Ampacity (MCA) as indicated on the outdoor unit rating plate and be of
type required by NEC and local codes.
AWG14
Line voltage (208~230V)
The connecting cable between the indoor and outdoor unit should be SJOW type, mini-
mum 18 gauge, and meet requirements of NEC and local codes.
AWG18
Low voltage (below 40V)
WARNING! Secure the interconnecting on both ends by using the clamps provided.
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 into the control board with the strain
relief clamp.
Holder for
power supply
cord
3. Refix the cover control to the original position with the
screw.
Power supply
cable
Outdoor side
A-UNIT
B-UNIT
1
2
3
4
1
2
3
4
Cover control
Connecting
cable
L
N
1
2
3
4
1
2
3
4
Terminal BLOCK
Indoor A-UNIT
Indoor B-UNIT
Power Source
208/230V AC
(High voltage)
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 out-
door 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.
(for low voltage line)
(2) Pull out connection cable through conduit.
(3) After conduit to the panel, fix nut to the opposite side of
panel
Terminal
block
(4) Pass the conneciton cable through the hole
(5) Properly connect the cable on the terminal block
(6) Fix the connection cable with cord clamp provided on the
unit not to have strain at the terminal when the connec-
tion cable is pulled outside up to a 35 pound weight.
Connecting cable
Cord clamp
Power supply
cable
Lock nut
Cap(Remove)
Hole
(for low voltage line)
Taping
(for sealing)
WARNING: Loose wiring may cause the
terminal to overheat or result in unit mal-
function. A fire hazard may also exist.
Therefore, be sure all wiring is tightly con-
nected.
Power supply line
(1ø, 230/208V)
Low voltage line
(connecting cable)
Conduit panel
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
(1) Cut the wire end with a wire cutter or wire-cutting pli-
ers, then strip the insulation to expose the strand
wiring about 10mm(3/8").
Round
terminal
(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
Fastening the
wire tightly
terminal block screw
Connecting cable
Connecting cable
Service Manual 27
Connecting the Cable between Indoor Unit and Outdoor Unit
CAUTION! Provide a circuit breaker between the power source and the outdoor
unit as shown below. Size breaker per the Maximum Fuse or Circuit Breaker (MOC)
rating on the unit rating plate.
Main power source
Air
Fuse or breaker
Circuit Breaker
Use a circuit
breaker or time
delay fuse.
Model
18k
Power source
Conditioner
Capacity
1ø,230/208V
20A
Connect the cable to the indoor unit
1. Connect the wires to the terminals on the control
board individually according to the outdoor unit con-
nection.
• Ensure that the color of the wires of outdoor unit
and the terminal No. are the same as those of
indoor unit respectively.
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 chas-
sis.
• 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
Downward slope
flow.
2. Examples of incorrect drain piping.
Accumulated
drain water
Air
Do not raise
Less than
50mm gap
Tip of drain hose
dipped in water
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
In cases where the outdoor unit is
installed below the indoor unit perform
the following.
Connecting
cable
1. Tape the piping, drain hose and connecting cable
Power supply
cord
from down to up.
2. Secure the tapped piping along the exterior wall
• Trap is required to prevent water from entering
into electrical parts.
using saddle or equivalent.
In cases where the Outdoor unit is
installed above the Indoor unit perform
the following.
1. Tape the piping and connecting cable from down
Seal a small opening
around the pipings
to up.
with gum type sealant.
2. Secure the taped piping along the exterior wall.
Form a trap to prevent water entering the room.
3. Fix the piping onto the wall by saddle or equiva-
lent.
Trap
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
incondensible 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 ser-
vice valves.
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 complet-
ed. Remove the service valve caps from both the gas and
the liquid side on the outdoor unit. Check that both the liq-
uid and the gas side service valves on the outdoor unit are
kept closed at this stage.
Bubbles indicate a leak. Be sure to wipe off the soap
with a clean cloth.
2. After the system is found to be free of leaks, relieve
the nitrogen pressure by loosening the charge hose
connector at the nitrogen cylinder. When the system
pressure is reduced to normal, disconnect the hose
from the cylinder.
Leakage test
• Connect the manifold valve(with pressure gauges) and dry
nitrogen gas cylinder to this service port with charge
hoses.
CAUTION: Be sure to use a manifold
valve for leak testing.
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 pre-
ceding steps to the vacuum pump to evacuate the
tubing and indoor unit.
Indoor unit
Confirm the "Lo" knob of the manifold valve is open.
Then, run the vacuum pump.
The operation time for evacuation varies with tubing
length and capacity of the pump.
[Each Room] The vacuum pump must be operated
less than 0.8torr of the gage pressure.
Outdoor unit
2. When the desired vacuum is reached, close the "Lo"
knob of the manifold valve and stop the vacuum
pump.
Finishing the job
1. With a service valve wrench, turn the valve stem of
liquid side valve counter-clockwise to fully open the
valve.
2. Turn the valve stem of gas side valve counter-clock-
wise to fully open the valve.
Manifold valve
3. Loosen the charge hose connected to the gas side
Pressure
gauge
Lo
Hi
service port slightly to release the pressure, then
remove the hose.
4. Replace the flare nut and its bonnet on the gas side
service port and fasten the flare nut securely with an
adjustable wrench. This process is very important to
prevent leakage from the system.
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
I Each outdoor unit is factory charged (nameplate charge) for the evaporator as well as a 7.5m(25ft) line set for
each indoor line.
Any time total line set is used either shorter or longer then the nominal 15m(50ft) line set length the refrigerant
charge has to be adjusted.
I Whether the line set is made shorter or longer you must adjust the charge based on how many ft of tubing are
either added or removed based on 20g/m(0.22oz/ft) of R-410A per meter(foot).
Max 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)
18k
30m(100ft)
15m(50ft)
5m(16ft)
7.5m(25ft)
7.5m(25ft)
20g/m(0.22oz/ft)
Example: A 75ft line set is used for dual - zone 25 additional ft X 0.22 ounces per foot= add 5.5 ounces of R-
410A
Important:(Unit is critically charge)
If you are ever uncertain of the unit charge, reclaim, evacuate and weigh in the correct charge using the unit name-
plate charge adjusting for line sets longer or shorter than 7.5m(25ft) for each indoor unit.
Service Manual 33
Test Running
Test Running
1. Check that all tubing and wiring have been properly connected.
2. Check that the gas and liquid side service valves are fully open.
Prepare remote control
Remove the battery cover by pulling it according to the
arrow direction.
Insert new batteries making sure that the (+) and (–) of
battery are installed correctly.
Reattach the cover by pushing it back into position.
NOTICE
:
Bolt
• Use 2 AAA(1.5volt) batteries. Do not use rechargeable
batteries.
• Remove the batteries from the remote control if the sys-
tem is not going to be used for a long time.
Evaluation of the performance
Tubing connection
Operate all indoor units for 15~20 minutes, then check
the system refrigerant charge:
1.Measure the pressure of one of the gas side service
valves.
Intake temperature
2. Measure the temperature of the intake and discharge
of air.
Discharge air
3. Ensure the difference between the intake temperature
and the discharge is more than 8°C(14.4°F).
4. For reference, the gas side pressure of optimum condi-
tion is as below.(Cooling)
Outside ambient
TEMP.
The pressure of the gas side
service valve.
Discharge
temperature
Refrigerant
R-410A
35°C (95°F) 8.5~9.5kg/cm2G(120~135 P.S.I.G.)
NOTICE
:
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 sys-
tem is most likely undercharged, and charge should be added.
Important:
❏ Individual zones should be all in the same
operation mode (Heating or Cooling mode)
34 Multi type Air Conditioner
Operation
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
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 compressor is
off fan operates at low speed regardless of the setting.
I 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.
I 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
Operation
27°C(80.6°F), it operates with Super-Low(while in sleep mode, with the medium airflow speed).
• While 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.
• While in defrost control, the indoor is outdoor fans are turned off.
I Defrost Control(Heating)
• Defrost operation is controlled by timer and sensing temperature of outdoor pipe.
• The first defrost starts only when the outdoor pipe temperature falls below -6°C(21.2°F) after 35 minutes
passed from starting of heating operation and more than 4 minutes operation of compressor.
• Defrost ends after 12 minutes passed from starting of defrost operation when the outdoor pipe temperature
rises over 15°C(59°F) even before 12 minutes.
• The second defrost starts only when the outdoor pipe temperature falls below -6°C(21.2°F) after 35 minutes
passed from ending of the first defrost and more than 4 minutes operation of compressor.
I Fuzzy Operation
• When any of operation mode is not selected like the moment of the power on or when 3 hrs has passed since
the operation off, the operation mode is selected.
• When determining the operation mode, the compressor, the outdoor fan, and the 4 way valve are off and only
the indoor fan is operated for 15 seconds. Then an operation mode is selected according to the intake air
temp at that moment as follows.
24°C(75.2°F) ≤ Intake Air Temp
21°C(69.8°F) ≤ Intake Air Temp<24°C(75.2°F)
Intake Air Temp<21°C(69.8°F)
➲ Fuzzy Operation for Cooling
➲ Fuzzy Operation for Dehumidification
➲ Fuzzy Operation for Heating
• If any of the operation modes among cooling / dehumidification / heating mode operations is carried out for 10
sec or longer before Fuzzy operation, the mode before Fuzzy operation is operated.
1) Fuzzy Operation for Cooling
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C(0.9°F) or more
below the setting temp, the compressor is turned off. When 0.5°C(0.9°F) or more above the setting temp, the
compressor is turned on.
Compressor ON Temp
Compressor OFF Temp
➲ Setting Temp +0.5°C(0.9°F)
➲ Setting Temp + 0.5°C(0.9°F)
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
26°C(78.8°F)≤ Intake Air Temp
➲ 25°C(77°F)
24°C(75.2°F)≤ Intake Air Temp<26°C(78.8°F)
22°C(71.6°F)≤ Intake Air Temp<24°C(75.2°F)
18°C(64.4°F)≤ Intake Air Temp<22°C(71.6°F)
Intake Air Temp<18°C(64.4°F)
➲ Intake Air Temp + 1°C(1.8°F)
➲ Intake Air Temp + 0.5°C(0.9°F)
➲ Intake Air Temp
➲ 18°C(64.4°F)
• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature
automatically according to the Fuzzy rule.
• While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temper-
ature.
36 Multi type Air Conditioner
Operation
2) Fuzzy Operation for Dehumidification
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C(0.9°F) or more
below the setting temp, the compressor is turned off. When 0.5°C(0.9°F) or more above the setting temp, the
compressor is turned on.
Compressor ON Temp
Compressor OFF Temp
➲ Setting Temp + 0.5°C(0.9°F)
➲ Setting Temp+0.5°C(0.9°F)
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
26°C(78.8°F) ≤ Intake Air Temp
➲ 25°C(77°F)
24°C(75.2°F) ≤ Intake Air Temp<26°C(78.8°F)
22°C(71.6°F) ≤ Intake Air Temp<24°C(75.2°F)
18°C(64.4°F) ≤ Intake Air Temp<22°C(71.6°F)
Intake Air Temp<18°C(64.4°F)
➲ Intake Air Temp+1°C(1.8°F)
➲ Intake Air Temp+0.5°C(0.9°F)
➲ Intake Air Temp
➲ 18°C(64.4°F)
• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature
automatically according to the Fuzzy rule.
• While in Fuzzy operation, the airflow speed of the indoor fan repeats the low airflow speed or pause as in
dehumidification operation.
3) Fuzzy Operation for Heating
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 3°C(37.4°F) or more
above the setting temp, the compressor is turned off. When below the setting temp, the compressor is turned
on.
Compressor ON Temp
Compressor OFF Temp
➲ Setting Temp
➲ Setting Temp + 3°C(5.4°F)
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
20°C(68°F)≤Intake Air Temp
Intake Air Temp<20°C(68°F)
➲ Intake Air Temp + 0.5°C(0.9°F)
➲ 20°C(68°F)
• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the
Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature
automatically according to the Fuzzy rule.
• While in Fuzzy operation, the airflow speed of the indoor fan is set to the high or the medium according to the
intake air temperature and the setting temperature.
I Airflow Speed Selection
• The airflow speed of the indoor fan is set to high, medium, low, or power (auto) by the input of the airflow
speed selection key on the remote control.
I On-Timer Operation
• When the set time is reached after the time is input by the remote control, the appliance starts to operate.
• The timer LED is on when the on-timer is input. It is off when the time set by the timer is reached.
• If the appliance is operating at the time set by the timer, the operation continues.
While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature.
I Off-Timer Operation
• When the set time is reached after the time is input by the remote control, the appliance stops operating.
• The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached.
Service Manual 37
Operation
• If the appliance is on pause at the time set by the timer, the pause continues.
I Off-Timer <=> On-Timer Operation
• When the set time is reached after the on/off time is input by the remote control, the on/off-timer operation is
carried out according to the set time.
I 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 appli-
ance operation, the operation of the appliance stops.
• While the appliance is on pause, the sleep timer mode cannot be input.
• While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature
increases by 1°C(33.8°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.
I Chaos Swing Mode
• By the Chaos Swing key input, the upper/lower vane automatically operates with the Chaos Swing or they are
fixed to the desired direction.
• While in Chaos Swing mode, the angles of cooling and heating cycle operations are different.
I Chaos Natural Wind Mode
• When the Chaos Natural Wind mode is selected and then operated, the high, medium, or low speed of the air-
flow mode is operated for 2~15 sec. randomly by the Chaos Simulation.
I Jet Cool Mode Operation
• While in heating mode or Fuzzy operation, the Jet Cool key cannot be input. When it is input while in the
other mode operation (cooling, dehumidification, ventilation), the Jet Cool mode is operated.
• In the Jet Cool mode, the indoor fan is operated at super-high speed for 30 min at cooling mode operation.
• In the Jet Cool mode operation, the room temperature is controlled to the setting temperature, 18°C(64.4°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.
I Auto Restarting Operation
• When the power is restored after a sudden power failure while in appliance operation, the mode before the
power failure is kept on the memory and the appliance automatically operates in the mode on the memory.
38 Multi type Air Conditioner
Operation
I Forced Operation
• To operate the appliance by force in case that the remote control is lost, the forced operation selection switch
is on the main unit of the appliance to operate the appliance in the standard conditions.
• When the power is supplied while the slide switch is on the forced operation position, or when the slide switch
position is switched to the Auto Restarting (or test operation) position or switched from the remote control
position to the forced operation position while the power is on, the forced operation is carried out.
• When the slide switch position is switched from the forced operation position to the Auto Restarting position or
the remote control position, the forced operation is canceled and the appliance stops operating.
• In the forced operation mode, the indoor fan is operated at low speed for around 15 sec and then the opera-
tion condition is set according to the intake air temperature as follows.
24°C(43.2°F)≤Intake Air Temp
21°C(37.8°F)≤Intake Air Temp<24°C(43.2°F)
Intake Air Temp<21°C(37.8°F)
➲ Cooling Mode Operation, 22°C(39.6°F), High Speed
➲ Dehumidification Operation, 23°C(41.4°F), High Speed
➲ Heating Mode Operation, 24°C(43.2°F), High Speed
I Buzzer Sounding Operation
• When the appliance-operation key is input by the remote control, the short "beep-beep-" sounds.
• When the appliance-pause key is input by the remote control, the long "beep—" sounds.
Service Manual 39
Operation
Function of Indoor Unit
Split Type Indoor Unit
Operation ON/OFF by Remote controller
Sensing the Room Temperature
• Room temperature sensor. (THERMISTOR)
Room temperature control
• Maintains the room temperature in accordance with the Setting Temp.
Starting Current Control
• Indoor fan is delayed for 5 seconds at the starting.
Time Delay Safety Control
• Restarting is delayed for approx. 3 minutes.
Indoor Fan Speed Control
• High, Med, Low, Chaos, Jet Cool
Operation indication Lamps (LED)
On/Off
Sleep Mode : Lights up during Sleep Mode Auto operation.
Timer : Lights up during Timer operation.
Defrost Mode: Lights up during Defrost Mode or Hot Start operation (Heat pump model only)
: Lights up during the system operation.
Outdoor unit
operation
: Lights up during outdoor unit operation.(Cooling model only)
Desire temperature For cooling,dehumidification,heating modes it display Destired temperature
indicator
• Cooling
• Dehumidification : 18°C~30°C(64°F~86°F)
• Heating : 16~30°C(60°F~86°F)
: 18°C~30°C(64°F~86°F)
• AI : Auto Operation
• Po : Jet Cool
• Lo : Test Mode
: The function illustrates its dynamic mode by using a multiple lighting system. (Optional)
Plasma
Soft Dry Operation Mode
• Intermittent operation of fan at low speed.
Sleep Mode Auto Control
Deice (defrost) control (Heating)
• Both the indoor and outdoor fan
stops during deicing.
• Hot start after deice ends.
• The fan is switched to low(Cooling), med(Heating) speed.
• The unit will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.
Natural Air Control by CHAOS Logic
Hot-start Control (Heating)
• The fan is switched to intermittent or irregular operation
• The indoor fan stops until the
evaporator piping temperature will
be reached at 27°C(80.6°F).
•
The fan speed is automatically switched from high to low speed.
* Airflow Direction Control
• The louver can be set at the desired position or swing
up and down automatically.(Model base)
"Wall Mounted Type is standard"
* Functions is dependent on model type.
40 Multi type Air Conditioner
Operation
Function of Outdoor Unit
Outdoor Unit
Operating Step
• Compressor step varies considering condition such as room temp,outdoor temp, operating room
number,Temp gap between room temp and set temp and so on.
LEV Control
• LEV pulse is modulated to keep constant superheat or subcooling.
Out door Fan Control
• Outdoor fan operates at High or Off to respond to the load condition.
R/Valve Control(Heating Model Only)
• Convert R/Valve to change cooling to heating, heating to cooling.
Defrost Function
• After 45 min heating operation, check the defrost condition and if outdoor pipe temp is below -
5°C(23°F) and released from deice operation in case outdoor pipe temp is over 12°C(53.6°F) or 9 min
cooing mode.
•
To deice outdoor heat exchanger in low temp condtion, convert operating mode from heating to cooling mode.
Oil Return System
• In single(one) comp operation duration, another comp will operate for 30 seconds every 1 hours.
Comp Overload Protection
• To protect comp from being overload, protector will turn off the comp.
High Pressure Protction
• If cycle pressure is too high(around 36.7 kgf/cm2), it will turn off comp A
Service Manual 41
Operation
Remote Control Operation
The Remote Controller transmits the signals to the system.
START/STOP BUTTON
Operation starts when this button is pressed and stops when
the button is pressed again.
1
Signal transmitter
OPERATION MODE SELECTION BUTTON
Used to select the operation mode.
2
3
(Cooling Only)
(Heat Pump)
ROOM TEMPERATURE
SETTING BUTTONS
Used to select the room temperature.
INDOOR FAN SPEED SELECTOR
Used to select fan speed in four steps
low, medium, high and CHAOS.
4
5
6
5
6
1
3
JET COOL
Used to start or stop the speed cooling/heating.
(Speed cooling/heating operates super high fan speed.)
4
CHAOS SWING BUTTON
Used to stop or start louver movement and set the desired
up/down airflow direction.
10
2
7
CANCEL
9
SET
ON
OFF
AUTO CLEAN
16
11
8
13
ON/OFF TIMER BUTTONS
Used to set the time of starting and stopping operation.
7
8
9
12
17
18
15
°C/°F
TIME SETTING BUTTONS
Used to adjust the time.
14
TIMER SET/CANCEL BUTTON
Used to set the timer when the desired time is obtained and to cancel
the Timer operation.
SLEEP MODE AUTO BUTTON
Used to set Sleep Mode Auto operation.
10
11
12
13
14
15
Flip-up door
(opened)
AIR CIRCULATION BUTTON
Used to circulate the room air without cooling or heating.
Operation Mode
ROOM TEMPERATURE CHECKING BUTTON
Used to check the room temperature.
Cooling Operation
PLASMA(OPTIONAL)
Used to start or stop the plasma-purification function.
Auto Operation
RESET BUTTON
Initialize remote controller.
Healthy Dehumidification Operation
2nd F Button
Heating Operation
Used prior to using modes printed in blue at the bottom of buttons.
AUTO CLEAN
Used to set Auto Clean mode.
•
Cooling Model( ), Heat Pump Model(
)
16
17
˚C TO ˚F SWITCHING BUTTON
Used to switch temperature reading from Centigrade to Fahrenheit.
HORIZONTAL AIRFLOW DIRECTION CONTROL BUTTON (NOT ON
ALL MODELS)
18
Used to set the desired horizontal airflow direction.
42 Multi type Air Conditioner
Disassembly
Disassembly
Indoor Unit
Split Type 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
Service Manual 43
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.
44 Multi type Air Conditioner
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.
Service Manual 45
Schematic Diagram
Schematic Diagram
Electronic Control Device
1. Indoor Unit
1) Split Type
46 Multi type Air Conditioner
Schematic Diagram
2. Outdoor Unit
Service Manual 47
Schematic Diagram
5 6 1 * 2
1 u F
1 u F
1 M
4
7 2 * 3
1 u F
2 2 2 * 2
48 Multi type Air Conditioner
Schematic Diagram
Wiring Diagram
1. Room Type Indoor Unit
2. Outdoor Unit
Service Manual 49
Schematic Diagram
Components Locations
1. Indoor Unit
MAIN P.C.B ASM
1) Split Type
• TOP VIEW
PCB :6870A90409B
ASSY:6871A20771
6871A20782
• BOTTOM VIEW
50 Multi type Air Conditioner
Schematic Diagram
2. Display ASSEMBLY
1) Split Type (6871A20682A)
Service Manual 51
Schematic Diagram
3. Outdoor Unit
1) Component side
52 Multi type Air Conditioner
Schematic Diagram
2) Solder side
Service Manual 53
Troubleshooting Guide
Troubleshooting Guide
Refrigeration Cycle Diagram
Indoor
Outdoor
Ø 9.52
Th1
Th2
Th9
High
Pressure
S/W
Th3
Ø 9.52
Th4
C/V2
Th7
C/V1
Th5
Th8
EEV
EEV
Th6
Ø 6.35
Ø 6.35
A
c
c
B
Comp
A
Comp
Refrigerent Flow
Cooling
Th10
Strainer
Heating
LOC.
Description
PCB Connector
CN-TH2(Indoor)
CN-TH1(Indoor)
CN-TH1(Indoor)
CN-TH2(Indoor)
CN-TH1(Indoor)
CN-TH1(Indoor)
CN-TH1(Outdoor)
CN-TH1(Outdoor)
CN-TH2(Outdoor)
CN-TH2(Outdoor)
Th1 Thermistor for evaporating temperature
Th2 Thermistor for indoor air temperature
Th3 Thermistor for evaporating temperature
Th4 Thermistor for evaporating temperature
Th5 Thermistor for indoor air temperature
Th6 Thermistor for evaporating temperature
Th7 Thermistor for Discharge temperature
Th8 Thermistor for Discharge temperature
Th9 Thermistor for outdoor air temperature
Th10 Thermistor for Condensing temperature
54 Multi type Air Conditioner
Troubleshooting Guide
Self-diagnosis Function
I Error Indicator
• The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.
• Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
• If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed.
• After error occurrence, if error is released, error LED is also released simultaneously.
• To operate again on the occurrence of error code, be sure to turn off the power and then turn on.
• Having or not of error code is different from Model.
LED1 LED2
Indoor Error
Error code
Description
MPS Variable
LED1
LED2
Indoor Status
00
01
02
05
06
07
10
No Error
ON
Indoor Room Thermistor Error
Indoor In-Piping Error
1 time
2 times
5 times
6 times
7 times
OFF
OFF
OFF
OFF
OFF
OFF
Communication Error between In and Out
Indoor Out-Piping Error
Differnt mode operation
Indoor fan motor locked error
1 times
Outdoor Error
Error code
Description
MPS Variable
LED1(Red)
LED2(Green) Indoor Status
33
44
45
47
51
D-Pipe High(Normal)
3 times
4 times
4 times
4 times
5 times
3 times
4 times
5 times
7 times
1 times
OFF
OFF
OFF
OFF
OFF
Outdoor Air Thermistor Error(Open/Short)
Cond Pipe Thermistor Error(Open/Short)
Const. D-Pipe Thermistor Error(Open/Short)
Capcity Error(High/Low)
Service Manual 55
Troubleshooting Guide
Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air, and operating current.
Temp. difference
Current
: approx. 0°C(0°F)
: less than 80% of
rated current
All amount of refrigerant leaked out.
Check refrigeration cycle.
Temp. Difference
Operating Current
Temp. difference
Current
: approx. 8°C(14.4°F)
: less than 80% of
rated current
Refrigerant leakage
Clog of refrigeration cycle
Defective compressor
Temp. difference
Current
: less than 8°C(14.4°F)
: near the rated cur-
rent
Excessive amount of refrigerant
Temp. difference : over 8°C(14.4°F)
Normal
Notice:
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relatively higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
2. Check temperature and pressure of refrigeration cycle.
Suction pressure
(Compared with
the normal value)
Temperature
(Compared with
the normal value)
Cause of Trouble
Description
High
Defective compressor
Current is low.
Higher
Lower
Normal
Excessive amount of
refrigerant
High pressure does not quickly
rise at the beginning of operation.
Insufficient amount of
refrigerant(Leakage)
Clogging
Current is low.
Higher
Notice:
2
1. The suction pressure is usually 4.5~6.0 kg/cm G at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
56 Multi type Air Conditioner
Troubleshooting Guide
Electronic Parts Troubleshooting Guide
❇ Refer to electronic contorol device drawing & schematic diagram.
The Product doesn’t operate at all.
Trouble 1
Turn off the main power and wait until LED on outdoor PCB is off.
Turn on the main power again.
Does "Beeping" sound is made from the indoor unit?
NO
YES
• Primarily, the operating condi-
tion of Micom is O.K.
Check the voltage of power(AC208V/AC230V, 60Hz).
• The voltage of main power.
• The voltage applied to the unit.
• The connecting method of Indoor/Outdoor connecting cable (each color)
• The P.W.B. Ass'y
(Fuse, Noise Filter, Power Transformer, IC01D, IC02D, etc.)
• Check CN-DISP1
The operation check of the P.C.B. Ass'y
Specification
1) AC230V ± 30V
Remedy
Procedure
1) Replace
1) The input voltage of power trans-
former.
: Check the rated voltage
power transfomer.
2) 15V ± 1.5V
2) Replace
2) The output voltage of power
transformer.
power transfomer.
3) DC12V
4) DC5V
3) Replace IC01D.
4) Replace IC02D.
5) Replace IC01A.
3) IC01D(7812)
4) IC02D(7805)
5) IC01A(KIA7036)
5) The voltage of micom pin 29
: DC4.5V↑
Service Manual 57
Troubleshooting Guide
Product doesn't operate with the remote controller.
Trouble 2
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 as force.)
Caused by other parts except
Caused by the remote controller.
the remote controller
When the mark (
) is displayed in LCD
Check the contact of CN-DISP 1 connector
screen, replace battery.
When the detect switch (double key) inside the
remote controller door is fault, it is impossible to
operate temperature regulating(L / M) and wind
speed selecting.
Check DISP PWB Ass'y
-Voltage between CN1 ➀ - ➆ : DC +5V
Check the Display PWB Ass'y
• Check receiver ass'y
58 Multi type Air Conditioner
Troubleshooting Guide
The Compressor/Outdoor Fan are don't operate
Trouble 3
Turn on the main power.
Operate Cooling Mode by setting the disired temperature of the remote controller is less
than one of the Indoor temperature by 1°C at least.
When in air circulation mode, compressor/outdoor fan is stopped.
Check the sensor for Indoor temperature is attatched as close as to be effected by the
themperature of Heat Exchange (EVA.)
When the sensor circuit for Indoor temperature and connector are in bad connection or are
not engaged, Compressor/Outdoor fan is stopped.
• Check the related circuit of R01H(1K), R02H(1K), R03H(1K), R04H(1K), Micom(pin No. 74 ,
75 , 76 , 77 ).
• Check the Indoor temperature sensor is disconnected or not (about 10K at 25°C).
Check the Relay(RY-PWR, RY-START) for driving Compressor.
• Check the voltage between brown and blue cable of terminal to connect the Outdoor
(About AC208V / 230V).
• Check the related circuit of relay in Outdoor PCB Ass'y.
Check Point
Comp. ON
DC 5V
Comp. OFF
DC 0V
Between Micom(No. 50,51) and
GND
Between IC01M(No. 10) and
GND
DC 1V↓
DC 12V
Turn off main power.
Check the electrical wiring diagram of Outdoor side.
Check the open or short of connecting wires between Indoor and Outdoor.
Service Manual 59
Troubleshooting Guide
When indoor Fan does not operate.
Trouble 4
When indoor Fan does not operate.
Does the voltage of each terminals of CN-MOTOR CONNECTOR in
Indoor unit corresponds to values in the Table of page 69
Does the voltage of terminal of CN-DC/DC CONNECTOR in
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)
60 Multi type Air Conditioner
Troubleshooting Guide
When the louver does not operate.
When Vertical Louver does not operate.
Trouble 5
• 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 61
Troubleshooting Guide
Error Code
I Trouble Shooting
Error
code
Title
Cause of error
• Open / Short
• Soldered poorly
• Internal circuit error
Check point & Normal condition
Normal resistor : 10KΩ / at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
01
02
06
Indoor air sensor
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 5KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Indoor inlet pipe sensor
Indoor outlet pipe sensor
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 5KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
10KΩ
2.5Vdc
Ω
V
Check the resistance / voltage
❑ Check Point
1. Unplug the sensor on Indoor unit PCB.
2. Estimate the resistance of each sensor
3. If the resistance of the sensor is 10KΩ/5KΩ at 25°C(77°F), then sensor is normal
4. If the resistance of the sensor is 0 KΩ or ∞, then sensor is abnormal. ➔ Change the sensor.
5. Plug the sensor on Indoor unit PCB and Power ON.
6. Estimate the voltage of each sensor.
7. If the voltage of the sensor is 2.5Vdc / at 25°C(77°F), then sensor is normal.
8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ➔ Repair or Change the PCB
62 Multi type Air Conditioner
Troubleshooting Guide
Error
code
Title
Cause of error
Check point & Normal condition
• Power input AC 230V.(Outdoor, Indoor)
• The connector for transmission is disconnected.
• The connecting wires are misconnected.
• The GND 1,2 is not connected at main GND.
• The communication line is shorted at GND.
• Transmission circuit of outdoor PCB is abnormal.
• Transmission circuit of indoor PCB is abnormal.
Communication
(Indoor ➔ Outdoor)
05 / 53
• Communication poorly
❑ Check Point
1. Check the input power AC 230V.(Outdoor, Indoor)
2. Check the communication wires are correctly connected.
➔ Adjust the connection of wire
➔ Confirm the wire of "Live", "Neutral".
3. Check the resistance between communication line and GND.(Normal : Over 2MΩ)
4. Check the connector for communication is correctly connected.
5. Check the connection of GND1, GND2, and main GND.
6. If one indoor unit is operated normally, outdoor PCB is no problem.
➔ Check the another indoor unit.
* CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit.
Service Manual 63
Troubleshooting Guide
Error
code
Title
Cause of error
Check point & Normal condition
• Check the discharge pipe sensor.
• Check the install condition for over load.
• Check the leakage of refrigerent.
• Check the SVC V/V open.
• Discharge sensor
temp. high
33
D-Pipe Temp. High
COMP OFF
115°C(239°F)
LEV OPEN(16PULSE/MIN)
100°C(212°F)
95°C(203°F)
LEV OPEN(10PULSE/MIN)
NORMAL
❑ Check Point
1. Check the install condition for over load.
2. Check the SVC V/V open.
3. Check the leakage of refrigerent.
4. Check the constant compressor.
Error
code
Title
Cause of error
Check point & Normal condition
• Over Capacitor com-
bination
• Check the indoor unit capacity.
• Check the combination table
51
Capacitor error
❑ Check Point
1. Check the indoor unit capacity.
2. Check the combination table.
# In the tropical model case
➔ single cycle has no error for over capacity.
64 Multi type Air Conditioner
Troubleshooting Guide
Error
code
Title
Cause of error
• Open / Short
• Soldered poorly
• Internal circuit error
Check point & Normal condition
Normal resistor : 10KΩ / at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
44
45
47
Outdoor air sensor
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 5KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Condensor pipe sensor
D-Pipe sensor
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 200KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 4.5Vdc / at 25°C(77°F) (plugged)
Ω
Ω
Check the resistance
❑ Check Point
1. Estimate the resistance of each sensor.(Unplugged)
2. Estimate the voltage of each sensor.(Plugged)
3. If the resistance is 0V or 5Vdc, then sensor is abnormal
Service Manual 65
2-way, 3-way Valve
2-way, 3-way Valve
2-way Valve (Liguid Side)
3-way Valve (Gas Side)
Valve cap
Hexagonal wrench
(4mm)
Open position
Closed position
Flare nut
Flare nut
Open position
Pin
Closed position
To
To
piping
piping
Service
port cap
Service
port
connection
connection
To outdoor unit
To outdoor unit
Works
Shaft position
Shaft position
Service port
Shipping
Closed
Closed
Closed
(with valve cap)
(with valve cap)
(with cap)
Air purging
Open
Closed
Open
(Installation)
(counter-clockwise)
(clockwise)
(push-pin or with
vacuum pump)
1.
2.
Operation
Open
Open
Closed
(with valve cap)
(with valve cap)
(with cap)
Pumping down
(Transfering)
Closed
Open
Open
(clockwise)
(counter-clockwise)
(connected
manifold gauge)
Evacuation
(Servicing)
Open
Open
Open
Open
Open
Open
Open
Open
Open
3.
4.
(with charging
cylinder)
Gas charging
(Servicing)
Open
(with charging
cylinder)
Pressure check
(Servicing)
Open
5.
6.
(with charging
cylinder)
Gas releasing
(Servicing)
Open
(with charging
cylinder)
66 Multi type Air Conditioner
2-way, 3-way Valve
(1) Pumping down
Liquid side
Indoor unit
Outdoor unit
Close
2-Way
valve
Gas side
Open
3-Way
valve
Liquid side
Indoor unit
Close
2-Way
valve
Gas side
Open
3-Way
valve
manifold gauge
Low-
handle
(CLOSE)
Hi- handle
(CLOSE)
• Procedure
6. Operate the air conditioner at the cooling cycle
1. Confirm that both the gas side and liquid side
valves are set to the open position.
2
and stop it when the gauge indicates 1kg/cmg.
- Remove the valve stem caps and confirm that the
valve stems are in the raised position.
7. Immediately set the gas side valve to the closed
position.
- Do this quickly so that the gauge ends up indicat-
- Be sure to use a hexagonal wrench to operate
the valve stems.
ing 1kg/
g.
8. Disconnect the charge set, and mount the liquid
side and gas side valve caps and the service port
nut.
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then con-
nect the manifold gauge to the service port of the
gas side valve.
- Use torque wrench to tighten the service port nut to
a torque of 1.8kg.m.(156.2 lbf·in) [4.2kg.m (364.5
lbf·in)/5.5kg.m (477.4 lbf·in)]
- Connect the hose of the gauge with the push pin
to the service port.
- Be sure to check for gas leakage.
4. Air purging of the charge hose.
- Open the Low-handle valve on the gauge
slightly to air purge from the hose.
5. Set the liquid side valve to the closed position.
• Be sure to short pressure S/W. otherwise Low pressure S/W detect low pressure skete and stops the compressor.
Service Manual 67
2-way, 3-way Valve
(2) Evacuation
(All amount of refrigerant leaked)
Liquid side
Indoor unit
Outdoor unit
Open
2-Way
valve
Gas side
Open
3-Way
valve
Liquid side
Indoor unit
Open
2-Way
valve
Gas side
Open
3-Way
valve
manifold gauge
Vacuum pump
Low-
handle
(OPEN)
Hi- handle
(OPEN)
• Procedure
6. Disconnect the charge hose from the vacuum
pump.
1. Confirm that both the liguid side valve and gas
side valve are set to the opened position.
- Vacuum pump oil.
If the vacuum pump oil becomes dirty or deplet-
ed,replenish as needed.
2. Connect the vaccum pump to the center hose of
the manifold gauge.
3. Connect the service port of the gas side valve to
the low side of the gauge.
7. Mount the valve caps and the service port caps.
4. Evacuation for approximately one hour.
- Confirm that the gauge needle has moved
toward-76 cmHg (vacuum of 4 mmHg or less).
5. Close the Low handle of the gauge turn off the
vacuum pump, and confirm that the gauge needle
does not move(approximately 5 minutes after
turning off the vacuum pump).
68 Multi type Air Conditioner
2-way, 3-way Valve
(3) Gas Charging
(After Evacuation)
Liquid side
Indoor unit
Outdoor unit
Open
2-Way
valve
Gas side
Open
3-Way
valve
Liquid side
Indoor unit
Open
2-Way
valve
Gas side
Open
3-Way
valve
manifold gauge
Charging
cylinder
Low-handle
(OPEN)
Hi- handle
(OPEN)
Check valve
• Procedure
1. Connect the gauge to the charging cylinder.
- Connect the charge hose which you disconnect-
ed from the vacuum pump to the valve at the
bottom of the cylinder.
4. Immediately disconnect the charge hose from
the gas side valve's service port.
This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.
- If you are using a gas cylinder, also use a scale
and reverse the cylinder so that the system can
be charged with liquid.
2. Purge the air from the charge hose.
-
Open the valve at the bottom of the cylinder and
press the check valve on the charge set to purge
the air. (Be careful of the liquid refrigerant). The
procedure is the same if using a gas cylinder.
- Stopping partway will allow the gas to be dis-
charged.
- If the system has been charged with liquid
refrigerant while operating the air conditioner
turn off the air conditioner before disconnecting
the hose.
3. Open the low handle on the gauge and charge
the system with liquid refrigerant.
- If the system can not be charged with the speci-
fied amount of refrigerant, it can be charged
with a little at a time (approximately 150g each
time) while operating the air conditioner in the
cooling cycle; however, one time is not suffi-
cient, wait approximately 1 minute and then
repeat the procedure(pumping down-pin).
5. Mount the valve stem nuts and the service port
nut.
- Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.(4.2kg.m/5.5kg.m.)
- Be sure to check for gas leakage.
Service Manual 69
Specifications and performance data subject to change without notice.
HEAT CONTROLLER, INC.
1900 WELLWORTH AVENUE • JACKSON, MICHIGAN 49203
THE QUALITY LEADER IN CONDITIONING AIR
05/15/07
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