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AIR CONDITIONER
INDOOR UNIT (Wall Mounted Type)

INSTALLATION MANUAL

Contents

1. SAFETY 

PRECAUTIONS 

.................................................................. 1

2. ABOUT 

THIS 

PRODUCT................................................................... 2

3. GENERAL 

SPECIFICATIONS 

........................................................... 2

4.  SELECTING THE INSTALLATION LOCATION ................................. 3

5. INSTALLATION 

WORK 

..................................................................... 3

6. ELECTRICAL 

WIRING 

...................................................................... 5

7. FINISHING 

........................................................................................ 6

8.  FRONT PANEL REMOVAL AND INSTALLATION ............................. 7

9.  

REMOTE CONTROLLER INSTALLATION ........................................ 7

10.  OPTIONAL KIT INSTALLATION ........................................................ 8

11. INSTALLATION 

WORK 

..................................................................... 8

12.  SELECTING THE REMOTE CONTROLLER CUSTOM CODE ........ 9

13. FUNCTION SETTING........................................................................ 9

14. TEST RUN 

........................................................................................11

15. CUSTOMER GUIDANCE 

.................................................................11

16. ERROR CODES 

...............................................................................11

PART No. 9320456016

1. SAFETY PRECAUTIONS

1.1. IMPORTANT! Please read before starting

This air conditioning system meets strict safety and operating standards.
As the installer or service person, it is an important part of your job to install or service the 
system so it operates safely and ef

fi

 ciently.

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.
•  Observe all local, state, and national electrical codes.
•  Pay close attention to all warning and caution notices given in this manual.

 WARNING

This symbol refers to a hazard or unsafe practice which can 
result in severe personal injury or death.

 CAUTION

This symbol refers to a hazard or unsafe practice which can 
result in personal injury and the potential for product or prop-
erty damage.

•  Hazard alerting symbols

 

 Electrical

 

 Safety/alert

If Necessary, Get Help

These instructions are all you need for most installation sites and maintenance conditions. 
If you require help for a special problem, contact our sales/service outlet or your certi

fi

 ed 

dealer for additional instructions.

In Case of Improper Installation

The manufacturer shall in no way be responsible for improper installation or maintenance 
service, including failure to follow the instructions in this document.

1.2. Special precautions

When Wiring

ELECTRICAL SHOCK CAN CAUSE SEVERE PERSONAL INJURY OR DEATH. ONLY A 
QUALIFIED, EXPERIENCED ELECTRICIAN SHOULD ATTEMPT TO WIRE THIS SYS-
TEM.
•  Do not supply power to the unit until all wiring and tubing are completed or reconnected 

and checked.

•  Highly dangerous electrical voltages are used in this system. Carefully refer to the wir-

ing diagram and these instructions when wiring. Improper connections and inadequate 
earthing (grounding) can cause accidental injury or death.

•  Earth (Ground) the unit following local electrical codes.
•  Connect all wiring tightly. Loose wiring may cause overheating at connection points and 

a possible 

fi

 re hazard.

When Transporting

Be careful when picking up and moving the indoor and outdoor units. Get a partner to 
help, and bend your knees when lifting to reduce strain on your back. Sharp edges or thin 
aluminum 

fi

 ns on the air conditioner can cut your 

fi

 ngers.

When Installing...
...In a Ceiling or Wall

Make sure the ceiling/wall is strong enough to hold the unit’s weight. It may be necessary 
to construct a strong wood or metal frame to provide added support.

...In a Room

Properly insulate any tubing run inside a room to prevent “sweating” that can cause drip-
ping and water damage to walls and 

fl

 oors.

...In an Area with High Winds

Securely anchor the outdoor unit down with bolts and a metal frame.
Provide a suitable air baf

fl

 e.

...In a Snowy Area (for Heat Pump-type Systems)

Install the outdoor unit on a raised platform that is higher than drifting snow.

When Connecting Refrigerant Tubing

•  Keep all tubing runs as short as possible.
• Use 

the 

fl

 are method for connecting tubing.

•  Apply refrigerant lubricant to the matching surfaces of the 

fl

 are and union tubes before 

connecting them, then tighten the nut with a torque wrench for a leak-free connection.

•  Check carefully for leaks before opening the refrigerant valves.

When Servicing

•  Turn the power OFF at the main circuit breaker panel before opening the unit to check 

or repair electrical parts and wiring.

• Keep 

your 

fi

 ngers and clothing away from any moving parts.

•  Clean up the site after you 

fi

 nish, remembering to check that no metal scraps or bits of 

wiring have been left inside the unit being serviced.

•  After installation, explain correct operation to the customer, using the operating manual.

 WARNING

Never touch electrical components immediately after the power supply has been turned 
off. Electric shock may occur. After turning off the power, always wait 5 minutes before 
touching electrical components.

If refrigerant leaks while work is being carried out, ventilate the area. If the refrigerant 
comes in contact with a 

fl

 ame, it produces a toxic gas.

 CAUTION

Do not attempt to install the air conditioner or a part of the air conditioner by yourself.

This unit must be installed by quali

fi

 ed personnel with a capacity certi

fi

 cate for handling 

refrigerant 

fl

 uids. Refer to regulation and laws in use on installation place.

This unit is part of a set constituting an air conditioner. It must not be installed alone or 
with non-authorized by the manufacturer.

Always use a separate power supply line protected by a circuit breaker operating on all 
wires with a distance between contact of 1/8 in. (3 mm) for this unit.

The unit must be correctly earthed (grounded) and the supply line must be equipped 
with a differential breaker in order to protect the persons.

The units are not explosion proof and therefore should not be installed in explosive 
atmosphere.

When moving, consult authorized service personnel for disconnection and installation 
of the unit.

Do not place any other electrical products or household belongings under indoor unit or 
outdoor unit. 
Dripping condensation from the unit might get them wet, and may cause damage or 
malfunction of your property.

• Installation must be performed in accordance with the requirement of NEC and CEC by 

authorized personnel only.

For authorized service personnel only.

9320456016_IM.indb   1

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Summary of Contents for ASU12RLS3

Page 1: ... fingers When Installing In a Ceiling or Wall Make sure the ceiling wall is strong enough to hold the unit s weight It may be necessary to construct a strong wood or metal frame to provide added support In a Room Properly insulate any tubing run inside a room to prevent sweating that can cause drip ping and water damage to walls and floors In an Area with High Winds Securely anchor the outdoor uni...

Page 2: ...ing with conventional refrigerant R22 and for safety Therefore check beforehand The charging port thread diameter for R410A is 1 2 20 UNF 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 taping etc When charging the refrigerant take into account the slight change in the co...

Page 3: ...r volatile inflammables such as paint thinner or gasoline If gas leaks and settles around the unit it can cause a fire Area where animals may urinate on the unit or ammonia may be generated Do not use the unit for special purposes such as storing food raising animals grow ing plants or preserving precision devices or art objects It can degrade the quality of the preserved or stored objects Do not ...

Page 4: ...t pipes top Rear piping Indoor unit drain hose bottom No gap Hexagonal wrench Drain cock Drain cap For left outlet piping cut off the piping outlet cutting groove with a hacksaw Indoor unit drain hose Drain cap Remove the drain cap by pull ing at the projection at the end of the cap with pliers etc Removal method of drain hose Remove the screw at the left of drain hose and pull out drain hose Inst...

Page 5: ...ut correctly Tighten the flare nuts with a torque wrench using the specified tightening method Otherwise the flare nuts could break after a prolonged period causing refrigerant to leak and generate hazardous gas if the refrigerant comes into contact with a flame CAUTION Connect the piping so that the control box cover can easily be removed for servicing when necessary In order to prevent water fro...

Page 6: ...erminal screw tightening torques Tightening torque lbf in N m M4 screw 11 to 16 1 2 to 1 8 CAUTION Attach the cable clamp firmly by holding the connection cable and make sure that the clamp is fixed securely Incomplete attachment of the cable clamp might cause a malfunction of the open panel Match the terminal block numbers and connection cable colors with those of the outdoor unit Erroneous wirin...

Page 7: ...roller holder Tapping screw small remote controller mounting Remote controller 2 Push 1 Set Overlap the insulation Vinyl tape Wrap with cloth tape Cloth tape Drain hose Connection cable Pipe Drain hose Drain hose Connection pipe Wall pipe Connection cable Left piping For connection from the left rear Pipe Connection pipe heat insulation Indoor unit pipe heat insulation Bind the pipes together so t...

Page 8: ...ng intake grille and front panel See 9 FRONT PANEL REMOVAL AND INSTALLATION and 9 1 Front panel removal 11 2 2 Removing control cover Screw 2 Control cover Control box Screw 1 Remove the screw 1 and 2 then remove the control cover 11 2 3 Installing relay control board and relay wire terminal Control unit board Connector CN2 Relay wire Notice 2 Clasps Connector CND01 Relay control board Clasp 2 Not...

Page 9: ...es to the function settings used to control the indoor unit according to the installation conditions Incorrect settings can cause the indoor unit to malfunction After the power is turned on perform the FUNCTION SETTING according to the installation conditions using the remote controller The settings may be selected between the following two Function Number or Setting Value Settings will not be cha...

Page 10: ...the FUNCTION SETTING be sure to turn off the power and turn it on again 13 2 Temperature correction NOTE When changing Function 95 perform this setting before other Room temp control settings Function 30 31 92 93 If Function 95 is not set first Room temperature control settings Function 30 31 92 93 will be reset and you must re do them again Heat Insulation condition building insulation Heat insul...

Page 11: ...r to the operating manual 1 Stop the air conditioner operation 2 Press the MODE button and the FAN button simultaneously for 2 seconds or more to start the test run Test run display 3 Press the START STOP button to stop the test run 15 CUSTOMER GUIDANCE Explain the following to the customer in accordance with the operating manual 1 Starting and stopping method operation switching temperature adjus...

Page 12: ...rip detection 9 5 Compressor rotor position detection error 9 7 Outdoor unit fan motor error 9 9 4 way valve error 10 1 Discharge temp error 10 3 Compressor temp error 10 4 High pressure error 10 5 Low pressure error 13 2 Branch boxes error Flexible Multi Display mode 0 5s ON 0 5s OFF 0 1s ON 0 1s OFF Number of flashing Troubleshooting with the indoor unit display OPERATION indicator green TIMER i...

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