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INSTALLATION MANUAL

PART No. 9371022642-02

VRF system indoor unit (Cassette type)

Contents

SAFETY PRECAUTIONS .........................................................................................1

ABOUT THIS PRODUCT..........................................................................................1

2.1. Precautions for using the R410A refrigerant ......................................................1

2.2. Special tools for R410A ......................................................................................1

2.3. Accessories ........................................................................................................2

2.4. Optional parts .....................................................................................................2

INSTALLATION WORK ............................................................................................2

3.1. Selecting an installation location ........................................................................2

3.2. Installation dimension .........................................................................................3

3.3. Installing the unit ................................................................................................3

PIPE INSTALLATION ...............................................................................................4

4.1. Selecting the pipe material .................................................................................4

4.2. Pipe requirement ................................................................................................4

4.3. Flare connection (pipe connection) ....................................................................4

4.4. Installing heat insulation .....................................................................................5

INSTALLING DRAIN PIPES .....................................................................................5

ELECTRICAL WIRING .............................................................................................6

6.1. Electrical requirement .........................................................................................6

6.2. Wiring method ....................................................................................................6

6.3. Unit wiring ...........................................................................................................7

6.4. Connection of wiring ...........................................................................................7

6.5. Optional parts wiring ...........................................................................................8

6.6. External input and external output (Optional parts) ............................................8

FIELD SETTING .......................................................................................................10

7.1. Setting the address ............................................................................................10

7.2. Custom code setting ...........................................................................................10

7.3. Function setting ..................................................................................................11

CASSETTE GRILLE INSTALLATION .......................................................................11

TEST RUN ................................................................................................................11

9.1. Test run using Outdoor unit (PCB) .....................................................................11

9.2. Test run using remote controller .........................................................................11

10. CHECK LIST .............................................................................................................11

11. ERROR CODES .......................................................................................................12

1. SAFETY PRECAUTIONS

• Be sure to read this Manual thoroughly before installation.

• The warnings and precautions indicated in this Manual contain important information

pertaining to your safety. Be sure to observe them.

• Hand this Manual, together with the Operating Manual to the customer. Request the cus-

tomer to keep them on hand for future use, such as for relocating or repairing the unit.

This mark indicates procedures which, if improperly per-

WARNING

formed, might lead to the death or serious injury of the user.

Request your dealer or a professional installer to install the unit in accordance with this

Manual.

An improperly installed unit can cause serious accidents such as water leakage, electric

shock, or fire.

If the unit is installed in disregard of the instructions in the Installation Manual, it will void

the manufacturer's warranty.

Do not turn ON the power until all work has been completed.

Turning ON the power before the work is completed can cause serious accidents such

as electric shock or fire.

If refrigerant leaks while work is being carried out, ventilate the area.

If the refrigerant comes in contact with a flame, it produces a toxic gas.

Installation work must be performed in accordance with national wiring standards by

authorized personnel only.

Except for EMERGENCY, never turn off main as well as sub breaker of the indoor units

during operation. It will cause compressor failure as well as water leakage. First, stop

the indoor unit by operating the control unit, converter or external input device and then

cut the breaker. Make sure to operate through the control unit, converter or external

input device. When the breaker is designed, locate it at a place where the users cannot

start and stop in the daily work.

En-1

This mark indicates procedures which, if improperly performed,

CAUTION

might possibly result in personal harm to the user, or damage

to property.

Read carefully all security information before use or install the air conditioner.

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

This unit must be installed by qualified personnel with a capacity certificate for handling

refrigerant fluids. Refer to regulation and laws in use on installation place.

The installation must be carried out in compliance with regulations in force in the place

of installation and the installation instructions of the manufacturer.

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 3mm 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.

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.

This unit contains no user-serviceable parts. Always consult authorized service person-

nel to repairs.

When moving, consult authorized service personnel for disconnection and installation

of the unit.

2. ABOUT THIS PRODUCT

2.1. Precautions for using the R410A refrigerant

Do not introduce any substance other than the prescribed refrigerant into the refrigera-

tion cycle.

If air enters the refrigeration cycle, the pressure in the refrigeration cycle will become

abnormally high and cause the piping to rupture.

If there is a refrigerant leakage, make sure that it does not exceed the concentration

limit.

If a refrigerant leakage exceeds the concentration limit, it can lead to accidents such as

oxygen starvation.

Do not touch refrigerant that has leaked from the refrigerant pipe connections or other

area. Touching the refrigerant directly can cause frostbite.

If a refrigerant leakage occurs during operation, immediately vacate the premises and

thoroughly ventilate the area.

If the refrigerant comes in contact with a flame, it produces a toxic gas.

2.2. Special tools for R410A

To install a unit that uses R410A refrigerant, use dedicated tools and piping materi-

als that have been manufactured specifically for R410A use. Because the pressure

of R410A refrigerant is approximately 1.6 times higher than the R22, failure to use

dedicated piping material or improper installation can cause rupture or injury.

Furthermore, it can cause serious accidents such as water leakage, electric shock, or

fire.

Tool name

Pressure is huge and cannot be measured with a conven-

tional gauge. To prevent erroneous mixing of other refriger-

ants, the diameter of each port has been changed.

Gauge manifold

It is recommended to use a gauge manifold with a high

pressure display range -0.1 to 5.3 MPa and a low pressure

display range -0.1 to 3.8 MPa.

To increase pressure resistance, the hose material and base

Charging hose

size were changed.

A conventional vacuum pump can be used by installing a

vacuum pump adapter.

• A conventional vacuum pump can be used by installing a

Vacuum pump

vacuum pump adapter.

• Be sure that the pump oil does not back flow into the

system. Use one capable for vacuum suction of -100.7kPa

(5 Ton, -755mmHg).

Gas leakage detector

Special gas leakage detector for HFC refrigerant R410A.

WARNING

Contents of change for R22 tool