SPLIT TYPE ROOM AIR CONDITIONER
(MODEL: ASU9RLS/AOU9RLS; ASU12RLS/AOU12RLS)
• Connect all wiring tightly. Loose wiring may cause overheating at con-
nection points and a possible fire hazard.
Please Read Before Starting
This air conditioning system meets strict safety and operating standards.
Be careful when picking up and moving the indoor and outdoor units.
As the installer or service person, it is an important part of your job to
Get a partner to help, and bend your knees when lifting to reduce strain
install or service the system so it operates safely and efficiently.
on your back. Sharp edges or thin aluminum fins on the air conditioner
can cut your fingers.
For safe installation and trouble-free operation, you must:
• Carefully read this instruction booklet before beginning.
• Follow each installation or repair step exactly as shown.
...In a Ceiling or Wall
• Observe all local, state, and national electrical codes.
Make sure the ceiling/wall is strong enough to hold the unit's weight. It
• Pay close attention to all danger, warning, and caution notices given in
may be necessary to construct a strong wood or metal frame to provide
This symbol refers to a hazard or unsafe practice which
...In a Room
can result in severe personal injury or death.
Properly insulate any tubing run inside a room to prevent "sweating" that
can cause dripping and water damage to walls and floors.
This symbol refers to a hazard or unsafe practice which
can result in personal injury and the potential for product
or property damage.
...In Moist or Uneven Locations
Use a raised concrete pad or concrete blocks to provide a solid, level
• Hazel alerting symbols
foundation for the outdoor unit. This prevents water damage and abnor-
...In an Area with High Winds
Securely anchor the outdoor unit down with bolts and a metal frame.
Provide a suitable air baffle.
Safety / alert
...In a Snowy Area (for Heat Pump-type Systems)
Install the outdoor unit on a raised platform that is higher than drifting
snow. Provide snow vents.
If Necessary, Get Help
When Connecting Refrigerant Tubing
These instructions are all you need for most installation sites and mainte-
nance conditions. If you require help for a special problem, contact our
• Keep all tubing runs as short as possible.
sales/service outlet or your certified dealer for additional instructions.
• Use the flare method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces of the flare and
In Case of Improper Installation
union tubes before connecting them, then tighten the nut with a torque
The manufacturer shall in no way be responsible for improper installation
wrench for a leak-free connection.
• Check carefully for leaks before starting the test run.
or maintenance service, including failure to follow the instructions in this
Depending on the system type, liquid and gas lines may be either nar-
row or wide. Therefore, to avoid confusion the refrigerant tubing for your
particular model is specified as either "small" or "large" rather than as
"liquid" or "gas".
ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL
INJURY OR DEATH. ONLY A QUALIFIED, EXPERIENCED
ELECTRICIAN SHOULD ATTEMPT TO WIRE THIS SYSTEM.
• Turn the power OFF at the main circuit breaker panel before opening
• Do not supply power to the unit until all wiring and tubing are completed
the unit to check or repair electrical parts and wiring.
• Keep your fingers and clothing away from any moving parts.
or reconnected and checked.
• Highly dangerous electrical voltages are used in this system. Carefully
• Clean up the site after you finish, remembering to check that no metal
scraps or bits of wiring have been left inside the unit being serviced.
refer to the wiring diagram and these instructions when wiring. Improper
• After installation, explain correct operation to the customer, using the
connections and inadequate grounding can cause accidental injury
• Ground the unit following local electrical codes.
This INSTALLATION MANUAL briefly outlines where
The following installation accessories are supplied. Use them as
and how to install the air conditioning system. Please
read over the entire set of instructions for the indoor
Name and Shape
Name and Shape
and outdoor units and make sure all accessory parts
Wall hook bracket
listed are with the system before beginning.
1. TYPE OF COPPER PIPE AND INSULATION MATERIAL
Copper tubing for connectin the outdoor unit to the indoor
unit and insulation material is available for purchase locally.
When you purchase them, please specify the following.
A. Deoxidized annealed copper pipe for refrigerant piping as:
Tapping screw (big)
Cut each pipe to the appropriate length +12" (30 cm)
Tapping screw (small)
to16" (40 cm) to dampen vibration between units.
B. Foamed polyethylene insulation for copper pipes as
required to precise length of piping. Wall thickness
of the insulation should not be less than 5/16" (8 mm).
C. Use insulated copper wire for field wiring.
Check local electrical codes and regulations
The following items are necessary to install this air conditioner. (The
before obtaining wire. Also, check any specified
items are not included with the air conditioner and must be purchased
instructions or limitations.
2. ADDITIONAL MATERIALS REQUIRED FOR INSTALLATION
A. Refrigeration (armored) tape
B. Insulated staples or clamps for connecting wire
Connection pipe assembly
(See your local electrical codes.)
Connection cord (3-conductor)
D. Refrigeration lubricant
E. Clamps or saddles to secure refrigerant piping
3. OPERATING RANGE
About 14 to 115 °F
About 5 to 75 °F
About 64 to 90 °F
86 °F or less
About 80% or less
Always make the air conditioner power supply a special branch cir-
Refrigerant suitable for a piping length of 49 ft (15 m) is charged in
cuit and provide a special switch and receptacle. Do not extend the
the outdoor unit at the factory.
When the piping is longer than 49 ft (15 m), additional charging is necessary.
Always select the size that corresponds to the capacity of the breaker
For the additional amount, see the table below.
to the size of the power cord.
49 ft (15 m)
66 ft (20 m)
9000 BTU/h 12000 BTU/h
3.5 oz (100 g)
MINIMUM CIRCUIT AMPACITY
Between 49 ft (15 m) and 66 ft (20 m), when using a connection pipe
other than that in the table, charge additional refrigerant with 0.2 oz/
MAXIMUM OVERCURRENT PROTECTION
(TIME DELAY FUSE OR HACR TYPE CIRCUIT BREAKER)
ft (20g/1 m) as the criteria.
When adding refrigerant, add the refrigerant from the charg-
ing port at the completion of work.
The maximum length of the piping is 66 ft (20 m). The maxi-
mum height (between indoor and outdoor) is 49 ft (15m). If
the units are further apart than this, correct operation can
not be guaranteed.
This air conditioner uses new refrigerant HFC (R410A).
The basic installation work procedures are the same as conventional refrigerant (R22) models.
However, pay careful attention to the following points:
(1) Since the working pressure is 1.6 times higher than that of conventional refrigerant(R22) mod-
els, some of the piping and installation and service tools are special.(See the table below.)
Especially, when replacing a conventional refrigerant(R22) model with a new refrigerant R410A
model, always replace the conventional piping and flare nuts with the R410A piping and flare nuts.
(2) Models that use refrigerant R410A have a different charging port thread diameter to prevent
erroneous charging with conventional refrigerant(R22) and for safety. Therefore, check
beforehand.[The charging port thread diameter for R410A is 1/2 threads per inch.]
(3) Be more careful that foreign matter (oil, water, etc.) does not enter the piping than with
refrigerant(R22) models. Also, when storing the piping ,securely seal the opening by pinching,
(4) When charging the refrigerant, take into account the slight change in the composition of the
gas and liquid phases, and always charge from the liquid phase side whose composition is
Special tools for R410A
Contents of change
Pressure is high and cannot be measured with a conventional gauge. To prevent erroneous
mixing of other refrigerants, the diameter of each port has been changed.
It is recommended the gauge with seals-0.1 to 5.3 MPa (-1 to 53 bar) for high pressure.
-0.1 to 3.8 MPa (-1 to 38 bar) for low pressure.
To increase pressure resistance, the hose material and base size were changed.
A conventional vacuum pump can be used by installing a vacuum pump adapter.
Gas leakage detector
Special gas leakage detector for HFC refrigerant R410A.
It is necessary to use seamless copper pipes and it is desirable
Table 1 Thicknesses of Annealed Copper Pipes
that the amount of residual oil is less than 40 mg/10m. Do not
use copper pipes having a collapsed, deformed or discolored
portion (especially on the interior surface). Otherwise, the ex-
pansion value or capillary tube may become blocked with con-
As an air conditioner using R410A incurs pressure higher than
when using R22, it is necessary to choose adequate materials.
Thicknesses of copper pipes used with R410A are as shown in Table1.Never use copper pipes thinner than 0.8mm even
when it is available on the market.
(1) Do not use the existing (for R22) piping and flare nuts.
• If the existing materials are used, the pressure inside the refrigerant cycle will rise and cause breakage, injury,
etc.(Use the special R410A materials.)
(2) When installing and relocating the air conditioner, do not mix gases other than the specified refrigerant(R410A)
to enter the refrigerant cycle.
• If air or other gas enters the refrigerant cycle, the pressure inside the cycle will rise to an abnormally high value
and cause breakage, injury, etc.
When installing pipes shorter than 10 ft (3m), sound of the outdoor unit will be transferred to the indoor unit, which
will cause large operating sound or some abnormal sound.
SELECTING THE MOUNTING
INSTALLATION DIAGRAM OF
INDOOR AND OUTDOOR UNITS
Decide the mounting position with the customer as follows:
1. INDOOR UNIT
(1) Install the indoor unit level on a strong wall which is not subject
(2) The inlet and outlet ports should not be obstructed : the air should
be able to blow all over the room.
2-3/4"(7 cm) or over
(3) Install the unit near an electric outlet or special branch circuit.
(4) Do not install the unit where it will be exposed to direct sunlight.
(5) Install the unit where connection to the outdoor unit is easy.
(6) Install the unit where the drain pipe can be easily installed.
(7) Take servicing, etc. into consideration and leave the spaces shown
in (Fig. 7). Also install the unit where the filter can be removed.
2. OUTDOOR UNIT
(1) If possible, do not install the unit where it will be exposed to di-
rect sunlight. (If necessary, install a blind that does not interfere
60"(150 cm) or over
with the air flow.)
70" (180 cm)
(2) Do not install the unit where a strong wind blows or where it is
(3) Do not install the unit where people pass.
(4) Take you neighbors into consideration so that they are not dis-
turbed by air blowing into their windows or by noise.
(5) Provide the space shown in Fig. 7 so that the air flow is not blocked.
Also for efficient operation, leave open three of the four direc-
tions front, rear, and both sides.
Install at a place that can withstand the weight of the
indoor and outdoor units and install positively so that
the units will not topple or fall.
(1) Do not install where there is the danger of com-
bustible gas leakage.
(2) Do not install near heat sources.
(3) If children under 10 years old may approach the
unit, take preventive measures so that they can-
not reach the unit.
(4) Install the indoor unit on the wall where the height
from the floors more than 70" (180 cm).
[Indoor unit piping direction]
The piping can be connected in the five directions indicated by 1, 2, 3,
4, and 5 in (Fig. 6). When the piping is connected in direction 2 or 5, cut
along the piping groove in the side of the front cover with a hacksaw.
• Do not directly install it
When connecting the piping in direction 3, cut a notch in the thin wall at
on the ground, otherwise
the front bottom of the front cover.
it will cause failure.
(1) When the outdoor temperature is 32 °F or less, do not use the access-
ory drain pipe and drain cap. If the drain pipe and drain cap are used,
the drain water in the pipe may freeze in extremety cold weather.
(Reverse cycle model only)
(2) In the area with heavy snowfall, if the intake and outlet of outdoor unit
is blocked with snow, it might become difficult to get warm and it is
2 Right outlet
1 Rear outlet
likely to cause of the breakdown. Please construct a canopy and a ped-
4 Left rear
estal or place the unit on a high stand (local configured).
3 Bottom outlet
21-1/4" (54 cm)
5 cm or over
CUTTING THE HOLE IN THE WALL FOR THE CONNECTING PIPING
(1) Cut a 2-9/16''(65 mm) diameter hole in the wall at the position shown
(2) When cutting the wall hole at the inside of the Wall hook bracket,
cut the hole within the range of the left and right center marks
3/8''(10 mm) below the Wall hook bracket.
When cutting the wall hole at the outside of the Wall hook bracket,
cut the hole at least 3/8''(10 mm) below less.
(3) Cut the hole so that the outside end is lower 3/16'' to 3/8'' (5 to 10 mm)
than the inside end.
(4) Always align the center of the wall hole. If misaligned, water leak-
age will occur.
(5) Cut the wall pipe to match the wall thickness, stick it into the wall
cap, fasten the cap with vinyl tape, and stick the pipe through the
hole. (The connection pipe is supplied in the installation set.)
(6) For left piping and right piping, cut the hole a little lower so that
drain water will flow freely. (Fig.1)
INSTALLING THE WALL HOOK BRACKET
(1) Install the wall hook bracket so that it is correctly positioned hori-
zontally and vertically. If the wall hook bracket is titled, water will
drip to the floor.
(2) Install the wall hook bracket so that it is strong enough to with-
stand the weight of an adult.
Fasten the wall hook bracket to the wall with 6 or more screws
through the holes near the outer edge of the bracket.
Check that there is no rattle at the wall hook bracket.
If the wall pipe is not used, the cord interconnecting
the indoor and outdoor units may touch metal and
cause electric leakage.
FORMING THE DRAIN HOSE AND PIPE
[Rear piping, Right piping, Bottom piping]
Install the indoor unit piping in the direction of the wall hole and
bind the drain hose and pipe together with vinyl tape. (Fig. 3)
Install the piping so that the drain hose is at the bottom.
Wrap the pipes of the indoor unit that are visible from the outside
with decorative tape.
[For Left rear piping, Left piping]
Interchange the drain cap and the drain hose.
Removal method of drain
Installation method of
Remove the screw at the left of
Vertically insert the drain hose
toward the inside, so that the
drain hose and pull out drain
drain fixture (blue) can accu-
rately align with the screw hole
around the drain cock.
After inserting and before re-
placing, please reinstall and fix
the removed screws.
Be sure to install around the drain hose connector.
As the screw is inside, be sure to use screwdriver treated with magnet.
OUTDOOR UNIT INSTALLATION
Set the unit on a strong stand, such as one made of concrete blocks
to minimize shock and vibration.
Do not set the unit directly on the ground because it will cause trou-
Wall hook bracket
Connector cover removal
5- 1/8"(13 cm)
Remove the tapping screw.
Installing the connector cover
(1) After inserting the three front hooks, then insert the rear hook.
(2) Tighten the tapping screw.
(1) Install the unit where it will not be tilted by more
(2) When installing the outdoor unit where it may ex-
posed to strong wind, fasten it securely.
Always use a vacuum pump to purge the air.
Refrigerant for purging the air is not charged in the
outdoor unit at the factory.
Close the high pressure side valve of the gauge manifold fully and do
not operate it during the following work.
1. Check if the piping connections are secure.
2. Check that the stems of 2-way valve and 3-way valve are closed
3. Connect the gauge manifold charge hose to the charging port
of the 3-way valve (side with the projection for pushing in the
4. Open the low pressure side valve of the gauge manifold fully.
5. Operate the vacuum pump and start pump down.
6. Slowly loosen the flare nut of the 3-way valve and check if air
enters, then retighten the flare nut.
(When the flare nut is loosened the operating sound of the
• To obtain better operation
vacuum pump changes and the reading of the compound
efficiency, when the outdoor
pressure gauge goes from minus to zero.)
unit is installed, be sure to
open the front and left side.
7. Pump down the system for at least 15 minutes, then check if the
compound pressure gauge reads -0.1 MPa (-76 cmHg, -1 bar).
8. At the end of pump down, close the low pressure side gauge of
the gauge manifold fully and stop the vacuum pump.
9. Slowly loosen the valve stem of the 3-way valve. When the
compound pressure gauge reading reaches 0.1-0.2 MPa,
retighten the valve stem and disconnect the charge hose
from the 3-way valve charging port.
(If the stem of the 3-way valve is opened fully before the
charge hose is disconnected, it may be difficult to disconnect
the charge hose.)
Installation method of Drain cap
Use a hexagonal wrench (5/32" (4mm) at opposite side) to insert
the drain cap, till the drain cap contacts the tip of drain cock.
For left piping and left rear piping, align the marks on the wall
hook bracket and shape the connection pipe.
Bend the connection piping at a bend radius of 2 - 3/4''(70 mm) or
more and install no more than 1- 3/8''(35 mm) from the wall.
2-9/16''(65 mm) dia.hole
After passing the indoor piping and drain hose through the wall
hole, hang the indoor unit on the hooks at the top and bottom of
the wall hook bracket.
3/16'' to 3/8''
(5 to 10 mm)
[Installing the indoor unit]
Hang the indoor unit from the hooks
at the top of the wall hook bracket.
Insert the spacer, etc. between the in-
door unit and the wall hook bracket
Wall hook bracket
and separate the bottom of the indoor
unit from the wall.
CONNECTING THE PIPING
(1) Install the outdoor unit wall cap (supplied with the optional in-
stallation set or procured at the site) to the wall pipe.
(2) Connect the outdoor unit and indoor unit piping.
(3) After matching the center of the flare surface and tightening the
Install the wall hook bracket horizontally and perpen-
nut hand tight, tighten the nut to the specified tightening torque
with a torque wrench. (Tighten the flare nut of the outdoor unit
3-way valve after air purging.)
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe
and remove the burrs.
(3) Insert the flare nut onto the pipe and flare the pipe with a flaring
Bind with vinyl tape
Check if [L] is flared uniformly
Indoor unit drain hose
and is not cracked or scratched.
1/4" (6.35 mm)dia. ...... 1/16" (1.4 to 1.7 mm)
Thick pipe 3/8" (9.52 mm)dia. ...... 5/64" (1.8 to 2.0 mm)
(1) In order to align the drain hose and drain cap, be
sure to insert securely and vertically. Incline in-
sertion will cause water leakage.
(2) When inserting, be sure not to attach any mate-
rial besides water. If any other material is attached,
it will cause deterioration and water leakage.
The pipes are shaped by your hands. Be careful not to collapse them.
(3) After removing drain hose, be sure not to forget
mounting drain cap.
(4) Be sure to fix the drain hose with tape to the bot-
tom of piping.
(5) Prevent drain water frozen under low tempera-
Extend the pipe
When installing indoor unit's drain hose outdoors,
by unwinding it.
necessary measure for frost protection should be
taken to prevent drain water frozen.
Do not bend the pipes in an angle more than 90°.
Under low temperature environment (when out-
When pipes are repeatedly bent or stretched, the material will harden,
door temperature under 32 °F), after cooling op-
making it difficult to bend or stretch them any more. Do not bend or stretch
eration is executed, water in the drain hose could
the pipes more than three times.
Once drain water is frozen, the drain hose will
be blocked and water leakage may be resulted
for indoor unit.
ELECTRICAL WIRING (OUTDOOR UNIT)
1. Remove the screws, then remove the control box cover.
2. Fasten the Inter unit wire harness and power supply to the conduit holder using the lock nut.
3. Connect inter-unit wire harness and power supply to the terminal.
Refer to the wiring diagram
4. Use the screws to install the control box cover.
Be sure to comply with local codes while run-
ning the wire from the indoor unit to the out-
door unit (size of wire and wiring method, etc. ).
Every wire must be connected firmly.
Always use the screws as shown above.
Do not select the top and bottom screws incorrectly.
No wire should be allowed to touch refrigerant
tubing, the compressor or any moving part.
Loose wiring may cause the terminal to over-
heat or result in unit malfunction. A fire hazard
may also exist. Therefore, be sure all wiring is
10. Fully open the valve stems of the 2-way valve and 3-way valve
Connect wires to the matching numbers of
using a hexagon wrench. (After the valve stem begins to turn,
turn it with a torque of less than 2.17ft•lbs (30 kgf•cm) until it
11. Firmly tighten the 2-way valve and 3-way valve blank cap and
the charging port cap.
Compound pressure gauge
Charging port cap
Blank cap (2-way valve) 14.47 to 18.08 ft•lbs (200 to 250 kgf•cm)
Blank cap (3-way valve) 20.25 to 23.15 ft•lbs (280 to 320 kgf•cm)
Charging port cap
9.04 to 11.57 ft•lbs (125 to 160 kgf•cm)
(1) Refrigerant must not be discharged into atmos-
(2) After connecting the piping , check the joints for
gas leakage with gas leak detector.
Align the marks.
Bend 2-3/4" (R70)
with a pipe bender
Wall hook bracket
After hooking the indoor unit to the top hook, hook the fittings of the
indoor unit to the two bottom hooks while lowering the unit and
pushing it against the wall.
Tighten with two wrenches.
To prevent gas leakage,
Indoor unit pipe
coat the flare surface
with refrigerator oil.
Flare nut tightening torque
Tightening torque standard
(using a 20 cm wrench)
11.57 to 13.02 ft•lbs
1/4" (6.35 mm)dia.
(160 to 180 kgf•cm)
21.70 to 30.38 ft•lbs
3/8" (9.52 mm)dia.
(300 to 420 kgf•cm)
(1) Fasten a flare nut with a torque wrench as instructed in this manual. If
fastened too tight, the flare nut may be broken after a long period of time
and cause a leakage of refrigerant.
(2) During installation, make sure that the refrigerant pipe is attached firmly
before you run the compressor. Do not operate the compressor under the
condition of refrigerant piping not attached properly with 2-way or 3-way
valve open. This may cause abnormal pressure in the refrigeration cycle
that leads to breakage and even injury.
• Connector trade size for this unit is 1/2" (12.7 mm). The connec-
tor can be bought at a hardware store. Refer to "How to connect
wiring to the terminals" for instructions on connecting depend-
ing on the wire type you are using.
• The fuse located in the outdoor unit provides power supply pro-
tection and may blow when power is applied if the system has
been incorrectly wired.
Control box cover
Inter-unit wire harness
Inter-unit wire harness
Power supply line