Hitachi RPC-1.5FSN3 Instruction Manual

P5416543
IMPORTANT:
READ AND UNDERSTAND
THIS MANUAL BEFORE
USING THIS HEAT-PUMP
AIR CONDITIONERS.
KEEP THIS MANUAL FOR
FUTURE REFERENCE.
Type Model
Ceiling
RPC-1.5FSN3
RPC-2.0FSN3
RPC-2.5FSN3
RPC-3.0FSN3
RPC-4.0FSN3
RPC-5.0FSN3
RPC-6.0FSN3
Installation
&
Maintenance
Manual
INVERTER-DRIVEN
MULTI-SPLIT SYSTEM
HEAT PUMP
AIR CONDITIONERS

P5416543 i
IMPORTANT NOTICE
lHITACHI pursues a policy of continuing improvement in design and performance of products.
The right is therefore reserved to vary specications without notice.
lHITACHI cannot anticipate every possible circumstance that might involve a potential hazard.
lThis heat pump air conditioner is designed for standard air conditioning only. Do not use this heat pump
air conditioner for other purpose such as drying clothes, refrigerating foods or for any other cooling or
heating process.
l Do not install the unit in the following places. It may cause a re, deformation, corrosion or failure.
* Places where a re, oil, steam or powder may enter directly to the unit such as right above a kitchen, etc.
* Places where oil (including machinery oil) may be present in quantities.
* Places where a lot of sulde gas drifts such as in a hot spring.
* Places where inammable gas may generate or ow.
* Places where strong salty wind blows such as coast regions.
* Places with an atmosphere of acidity or alkalinity.
* Places where gas from festering trash, etc. may generate.
l Do not install the unit in the place where silicon gas drifts. If the silicon gas attaches to the surface of heat
exchanger, the n surface repels water. As a result, drain water splashes outside of the drain pan and
splashed water runs inside of electrical box. In the end, water leakage or electrical devices failure may
occur.
l Pay attention to the following points when the unit is installed in a hospital or other facilities where an
electromagnetic wave generates from a medical equipment.
* Do not install the unit in the place where an electromagnetic wave is directly radiated to the electrical box,
remote control cable or remote control switch.
* Install the unit at least 3 meters away from an electromagnetic wave such as a radio.
l Do not install the unit in the place where the breeze directly catches animals and plants. It could adversely
affect animals and plants.
l The installer and system specialist shall secure safety against the refrigerant leakage according to local
regulations or standards. The following standards may be applicable, if local regulations are not available.
International Organization for Standardization, ISO5149 or European Standard, EN378 or Japan Standard,
KHKS0010.
l No part of this manual may be reproduced without written permission.
l It is assumed that this heat pump air conditioner will be operated and serviced by English speaking people.
If this is not the case, the customer should be add safety, caution and operating signs in the native
language.
l If you have any questions, contact your distributor or dealer of HITACHI.
l This manual gives a common description and information for this heat pump air conditioner which you
operate as well for other models.
lThis product is designed for standard air conditioning only.
DO NOT use this product for specic purposes, such as restoring foods, animals & plants, precision
devices, art objects, etc.

ii P5416543
CHECKING PRODUCT RECEIVED
lUpon receiving this product, inspect it for any shipping damage.
Claims for damage, either apparent or concealed, should be led immediately with the shipping company.
l Check the model number, electrical characteristics (power supply, voltage and frequency) and accessories
to determine if they are correct.
The standard utilization of the unit shall be explained in these instructions.
Therefore, the utilization of the unit other than those indicated in these instructions is not recommended.
Please contact your local agent, as the occasion arises.
HITACHI’s liability shall not cover defects arising from the alteration performed by a customer without
HITACHI’s consent in a written form.
Temperature (oC)
Maximum Minimum
Cooling
Operation
Indoor 30 DB 21.5 DB
Outdoor 43 DB * -5 DB *
Heating
Operation
Indoor 25 DB 17 DB
Outdoor 15.5 WB * -10 WB *
DB: Dry Bulb, WB: Wet Bulb
* The temperature may change depending on the outdoor unit.
This manual should be considered as a permanent part of the air conditioning equipment and should
remain with the air conditioning equipment.
l DO NOT install the air panel with motion sensor in the following places.
It may cause misdetection, undetectable of motion or the deterioration of the motion sensor.
* Places where ambient temperature changes drastically.
* Places where excessive force or vibration is applied to the motion sensor.
* Places where static electricity or electromagnetic waves may generate.
* Places where is interference for infrared light such as glasses or mist in a detecting area.
* Places where the lens for motion sensor is exposed in high temperature and humidity for a long time.
* Places where uid and corrosive gas exist.
* Places where direct lights such as sunlight or headlight affect the motion sensor.
* Places where hot air from a heater, etc. affects directly the motion sensor.
* Places where the air ow returns to the motion sensor by hitting obstacles such as shelf, locker, etc.
* Places where the blower devices such as ceiling fan, ventilating fan, etc. affect the air ow from the
indoor unit.
* Places where weather affects directly the surface of the motion sensor.
* Places where the lens surface may smudge or be damaged such as a dusty environment.
Pay attention that the detecting function will be decreased if the lens for motion sensor smudges.
In this case, wipe off smudges by a cotton swab soaked alcohol (Isopropyl alcohol is recommended.)
or a soft cloth.
(When wiping off smudges on the lens for motion sensor, do not apply excessive force.
If excessive force is applied, the resin lens may be damaged so that may cause malfunctions such as
misdetection or undetectable of the motion.)
l This heat pump air conditioner has been designed for the following temperatures. Operate the heat pump
air conditioner within this range.

P5416543 iii
TABLE OF CONTENTS
1. Safety Summary .............................................................................................................................................1
2. Structure..........................................................................................................................................................6
2.1 Name of Parts ........................................................................................................................................6
2.2 Refrigerant Cycle....................................................................................................................................7
2.3 Necessary Tools and Instrument List for Installation ..............................................................................8
3. Before Installation ...........................................................................................................................................9
3.1 Combination of Outdoor Unit and Indoor Unit ........................................................................................9
3.2 Transportation and Handling ..................................................................................................................9
4. Indoor Unit Installation ..................................................................................................................................10
4.1 Factory-Supplied Accessories ..............................................................................................................10
4.2 Initial Check.......................................................................................................................................... 11
4.3 Installation ............................................................................................................................................12
4.3.1 Position of Suspension Bolts ......................................................................................................12
4.3.2 Installation of Suspension Bolts..................................................................................................13
4.3.3 Mounting Indoor Unit ..................................................................................................................13
4.3.4 Installation of Remote Control Switch.........................................................................................14
5. Refrigerant Piping Work................................................................................................................................15
5.1 Piping Materials....................................................................................................................................15
5.2 Piping Connection ................................................................................................................................16
5.2.1 Position of Pipe Connection........................................................................................................16
5.2.2 Piping Connection.......................................................................................................................17
6. Drain Piping ..................................................................................................................................................19
7. Electrical Wiring ............................................................................................................................................21
7.1 General Check .....................................................................................................................................21
7.2 Electrical Wiring Capacity.....................................................................................................................22
7.2.1 Field Minimum Wire Sizes for Power Source .............................................................................22
7.2.2 Details of Electrical Wiring Connection.......................................................................................23
7.3 Position of Electrical Wiring Connection...............................................................................................29
7.4 Transition Wiring for Remote Control Switch........................................................................................32
7.4.1 Cautions for Individual Louver Setting........................................................................................34
7.4.2 Cautions for Air Panel with Motion Sensor .................................................................................35
7.4.3 Caution for Electrical Wiring .......................................................................................................37
7.5 Wiring Connection ................................................................................................................................38
7.6 Dip Switches Setting ............................................................................................................................38
7.7 Function Selection by Remote Control Switch .....................................................................................39
8. Test Run........................................................................................................................................................40
8.1 Before Test Run....................................................................................................................................40
8.2 Test Run ...............................................................................................................................................40
9. Safety and Control Device Setting ................................................................................................................45

P5416543 1
< Signal Words >
lSignal words are used to identify levels of hazard seriousness.
Denitions for identifying hazard levels are provided below with their respective signal words.
: DANGER indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
: WARNING indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
: CAUTION, used with the safety alert symbol, indicates a hazardous situation which,
if not avoided, could result in minor or moderate injury.
: NOTICE is used to address practices not related to personal injury.
: NOTE is useful information for operation and/or maintenance.
1. Safety Summary
DANGER
WARNING
CAUTION
NOTICE
NOTE

2 P5416543
l Do not perform the installation work, refrigerant piping work, drain pump, drain piping and electrical wiring
connection without referring to our installation manual. If the instructions are not followed, it may result in
a water leakage, electric shock or a re.
l Use the specied non-ammable refrigerant (R410A) to the outdoor unit in the refrigerant cycle.
Do not charge material other than R410A into the unit such as hydrocarbon refrigerants (propane or etc.),
oxygen, ammable gases (acetylene or etc.) or poisonous gases when installing, maintaining and moving.
These ammables are extremely dangerous and may cause an explosion, a re, and injury.
l Do not pour water into the indoor unit. These products are equipped with electrical parts.
If poured, it will cause a serious electrical shock.
l Do not open the service cover or access panel for the indoor or outdoor unit without turning OFF the main
power supply.
l Do not touch or adjust safety devices inside the indoor unit or outdoor unit. If these devices are touched
or readjusted, it may cause a serious accident.
l Refrigerant leakage can cause difculty with breathing due to insufcient air. Turn OFF the main switch,
extinguish any naked ames and contact your service contractor, if refrigerant leakage occurs.
l Make sure that the refrigerant leakage test should be performed.
Refrigerant (Fluorocarbon) for this unit is non-ammable, non-toxic and odorless.
However if the refrigerant is leaked and is contacted with re, toxic gas will generate.
Also because the uorocarbon is heavier than air, the oor surface will be lled with it, which could cause
suffocation.
l The installer and system specialist shall secure safety against refrigerant leakage according to local
regulations or standards.
l Use an ELB (Earth Leakage Breaker).
In the event of fault, there is danger of an electric shock or a re if it is not used.
l Do not install the outdoor unit where there is high level of oil mist, ammable gases, salty air or harmful
gases such as sulfur.
l For installation, rmly connect the refrigerant pipe before the compressor starts operating.
For maintenance, relocation and disposal, remove the refrigerant pipe after the compressor stops.
l Do not perform a short-circuit of the protection device such as the pressure switch when operating.
It may cause a re and explosion.
l Do not alter the product and the electrical wiring. It will cause a serious accident.
l Do not install the indoor unit in ammable environment to avoid re or ab explosion.
l As the new refrigerant (R410A) is adopted, the refrigerant oil has been also changed, which tends to be
affected by foreign matters such as moisture, oxide lm, fat. Perform the installation work with care not
to enter moisture, dust or old refrigerant into the refrigerant cycle, otherwise the parts such as expansion
valve bite foreign matter and the operation may be unavailable.
l Do not insert the drain pipe to the drainage trench where corrosive gases occur. Poisonous gases ow
into the room, so that may cause the poisoning.
l Cleaning inside Existing Refrigerant Pipe
* Non-ammable and nontoxic detergent shall be used to clean the pipe. If not, it may cause a re.
* Ventilate well, otherwise cleaning the pipe in the sealed room may cause suffocation. Additionally, if the
detergent contacts a re and is under high temperature, it may cause generation of toxic gas.
* The detergent after cleaning shall be recovered. It is prohibited to emit uorocarbons to the atmosphere
without permission.
DANGER

P5416543 3
l The installation work shall be performed by the specialist installer.
If it is not completed, it may cause a water leakage, an electric shock, a re or falling down the unit.
l Perform the electrical work according to Installation Manual and all the relevant regulation and standards.
If the instructions are not followed, an electrical shock and re may occur due to insufcient capacity and
inadequate performance.
l The electrical wiring work must be performed by authorized installers.
If not performing the electrical work completely or a capacity shortage of the power circuit, it may cause an
electric shock or a re.
Additionally, if the earth wire is disconnected, it may cause an electric shock.
Contact the authorized installer and connect the earth wiring.
l If the circuit breaker or fuse is often activated, stop the system and contact your service contractor.
l Check that the ground wire is securely connected. If the unit is not correctly grounded, it lead electric
shock. Do not connect the ground wiring to a gas piping, water piping, lighting conductor or ground wiring
for telephone.
l Use specied cables between units and choose the cables correctly. If not, an electrical shock or re may
occur.
l Ensure that the wiring terminals are tightened securely with the specied torques. If not, generating re or
an electrical shock at the terminal connection part may occur.
l Connect a fuse of specied capacity.
l Protect the wires, electrical parts, etc. from rats or other small animals.
If not protected, rats may gnaw at unprotected parts and which may lead to a re.
l Fix the cables securely. External forces on the terminals could lead to a re.
l Provide a sufciently strong foundation. If not, the unit may fall down and it may lead to injuries.
l If the indoor unit is installed in a small room and the refrigerant gas leakage occurs, the leaked refrigerant
gas lls the room and it may cause suffocation.
Do not exceed the maximum permissible concentration of the refrigerant gas in the room.
Consult with distributor for countermeasure such a ventilation system, etc.
l Before performing any brazing work, check to ensure that there is no ammable material around.
When using the refrigerant be sure to wear leather gloves to prevent cold injuries.
l Do not install the unit in a place where oil, vapor, organic solvent and corrosive gas (ammonia, sulfur
compound and acid) may be present in quantities.
It may cause refrigerant leakage due to corrosion, electrical shock, deteriorated performance and
breakage.
l Do not insert a nger or stick into the air outlet and the air inlet.
It could cause injury due to touch the rotating fan or electrical devices.
l Do not control the remote control switch by wet hand.
It may cause failure of the remote control switch or an electric shock.
l Do not use any sprays such as an insecticide, lacquer, hair spray or other ammable gases within
approximately one (1) meter from the system. It may generate a re.
l Do not install the indoor unit in a place where the air ow blows directly to heating appliances.
It may cause incomplete combustion of the heating appliances.
WARNING

4 P5416543
l When the indoor unit is operated with heating appliances, ventilate a room sufciently.
If not, it may cause suffocation.
l Turn OFF the main power source immediately if the protection device is frequently activated or the main
power source switch does not work.
If not, it may cause an electric shock, a re or explosion because there are possibilities of the electrical
leakage or overcurrent, etc. Contact your distributor or contractor.
l If abnormality (burnt odor, etc.) occurs, stop the operation and turn OFF the main power source
immediately. If not, it may cause breakage of the product, an electric shock or a re.
Contact your distributor or contractor.
l Do not operate the indoor unit without the electrical box cover and the air panel. It is unusually dangerous
that the indoor fan and electrical parts are exposed. In addition, it may cause an electric shock due to
touch the electrical parts.
l When the air conditioner is necessary to be repaired or relocated, contact your distributor or contractor.
If the repair and the installation are not completed, it may cause an electric shock or a re.
l Do not perform the installation work, the refrigerant piping work, the drain pump, the drain piping and
electrical wiring connection without tuning OFF the main power source.
It may cause an electric shock or injury.
l Perform the maintenance work with stable footing. If not, it may cause falling or injury.
l Do not spray water or detergent to the indoor unit when performing the maintenance work.
It may cause an electric shock or a re by electrical short-circuit.
l Protect securely the electrical parts and connectors not to splash water when performing the maintenance
work. It not, It may cause an electric shock or a re by electrical short-circuit.
l The inside piping charged refrigerant is high pressure. Perform securely the refrigerant piping work by the
authorized installer. If not, it may cause a serious accident.

P5416543 5
l Do not step or put any material on the product.
l Do not put any foreign material on the unit or inside the unit.
lDo not turn OFF the main power source of the indoor unit during the season of heating and cooling.
The water can not be discharged forcedly so that overows from the drain pan.
As the result, the oor and the ceiling surface are smudged.
lHold the air lter and the air inlet grille by hand when attaching (removing).
If not, it may cause falling or injury.
l Do not blow cold air to a person for a long time or overcool.
It may cause deterioration of physical condition and health impairment.
l Do not handle the unit by one person. Although the unit may be packed by polypropylene band, do not
use it for transportation. If the unit is handled by hand, the n surface of heat exchanger causes a cut.
l Do not install the indoor unit, outdoor unit, remote control switch and cable within approximately 3 meters
from strong electromagnetic wave radiators such as medical equipments.
l Supply electrical power to the system to energize the oil heater for 12 hours before startup after a long
shutdown.
l Make sure that the outdoor unit is not covered with snow or ice, before operation.
l In some cases, the packaged air conditioner may not be operated normally under the following cases.
* In case that electrical power for the packaged air conditioner is supplied from the same power
transformer as the device*.
* In case that the power source wires for the device* and the packaged air conditioner are located close to
each other.
Device*: (Ex) Lift, container crane, rectier for electric railway, inverter power device, arc furnace,
electric furnace, large-sized induction motor and large-sized switch.
It consumes a large quantity of electrical power.
Regarding the cases mentioned above, surge voltage may be inducted in the power supply wiring for the
packaged air conditioner due to a rapid change in power consumption of the device and an activation of
switch.
Therefore, check the eld regulations and standards before performing electrical work in order to protect
the power supply for the packaged air conditioner.
l Do not install the unit in the place where the air ow directly catches to animals or plants.
It could be the cause of adverse affect to animals or plants.
l Do not create an upper-slope or rise for the drain piping since drain water can ow back to the indoor unit
and leakage into the room will occur.
l Do not apply excessive force to the are nut when tightening. If it is applied, the are nut may crack due
to aged degradation and refrigerant leakage may occur. Use the specied tightening torque.
l It is recommended that the room will be ventilated every 3 to 4 hours.
l The heating capacity of the heat pump unit is decreased according to the outdoor air temperature.
Therefore, it is recommended that auxiliary heating equipment be used in the eld when the units is
installed in a low temperature region.
NOTICE
NOTE
CAUTION

6 P5416543
2. Structure
2.1 Name of Parts
No. Part Name Remarks
1Fan
2Fan Motor
3Heat Exchanger
4Distributor
5 Strainer
6Micro-Computer Control Expansion Valve
7Electrical Control Box
8Refrigerant Gas Pipe Connection with fa Flare Nut
9Refrigerant Liquid Pipe Connection with fb Flare Nut
10 Drain Pipe
11 Auto Louver Motor
12 Drain Pan
13 Air Inlet Grille
14 Air Filter
15 Air Outlet
16 Air Inlet
Model a b c d
RPC-1.5FSN3 12.7 6.35 960 916
RPC-2.0FSN3 15.88 6.35 960 916
RPC-2.5FSN3 15.88 9.52 1270 1226
RPC-3.0FSN3 15.88 9.52 1270 1226
RPC-4.0FSN3 15.88 9.52 1580 1536
RPC-5.0FSN3 15.88 9.52 1580 1536
RPC-6.0FSN3 15.88 9.52 1580 1536
>ABS<
HB
17A22761
>ABS<
HB
17A22761
12
15
16 14
1312
11
10
9
8
7
6 543
1 1
690
235
241
c
d

P5416543 7
2.2 Refrigerant Cycle
Mark Part Name
1Heat Exchanger
2Distributor
3 Strainer
4Micro-Computer Control Expansion Valve
HP 1.5 2.0 2.5 to 6.0
A (Gas Pipe Connection) f12.7 x 0.8 f15.88 x 1.0 f15.88 x 1.0
B (Liquid Pipe Connection) f6.35 x 0.8 f6.35 x 0.8 f9.52 x 0.8
C (OD x T) f12.7 x 0.8 f12.7 x 0.8 f15.88 x 1.0
D (OD x T) f12.7 x 0.8 f12.7 x 0.8 f12.7 x 0.8
1
2
3
4
Indoor Unit
S
S
3
Refrigerant Gas Pipe Connection ( )
A
Refrigerant Liquid Pipe Connection ( )
B
C
D
: Field Refrigerant Piping
: Flare Connection
: Refrigerant Flow Direction (Cooling)
: Refrigerant Flow Direction (Heating)

8 P5416543
2.3 Necessary Tools and Instrument List for Installation
Use tools and measuring instruments (vacuum pump, gas hose, charging cylinder,
gauge manifold, etc.) exclusively for the refrigerant R410A.
NOTE
No. Tool No. Tool No. Tool
1 Handsaw 8 Plier 16 Cutter for Wires
2Phillips Screwdriver 9Pipe Cutter 17 Gas Leak Detector
3Vacuum Pump 10 Brazing Kit 18 Leveller
4 Refrigerant Gas Hose 11 Hexagon Wrench 19 Clamper for Solderless Terminals
5Megohmmeter 12 Spanner 20 Hoist (for Indoor Unit)
6Copper Pipe Bender 13 Weigher 21 Ammeter
7Manual Water Pump
(for Indoor Unit)
14 Charging Cylinder 22 Voltage Meter
15 Gauge Manifold 23 Wrench

P5416543 9
3.2 Transportation and Handling
Do not put any material on the product or the
air panel. Do not step on the product.
Do not put any foreign material into the indoor
unit and check to ensure that no foreign
material exists in the indoor unit before the
installation and the test run. Otherwise, a re
or failure, etc. may occur.
• Transport the product as close to the installation
location as practical before unpacking.
(3) Push the side cover forward to remove the
hooks and the hooking plate.
(4) Remove the side cover to lift upward.
• When the indoor unit is unpacked, moved
and installed, do not take the air inlet grille,
louver and lower cover. Additionally, do not
apply an excessive force to them. The air inlet
grille, louver and lower cover are deformed or
damaged.
• Do not put any material on the indoor unit.
• Remove the side cover when the indoor unit is
moved after unpacking. If not, the side cover
may be damaged so that may cause injury.
< Removing Side Cover >
(1) Open the air inlet grille.
(2) Remove the xing screw (M4).
3. Before Installation
3.1 Combination of Outdoor Unit and Indoor
Unit
The combination capacity of indoor unit against
the outdoor unit is selected by the outdoor unit
capacity. Refer to the installation manual of
outdoor unit and select the indoor unit and the
outdoor unit to be satised the combination unit
number and the combination unit capacity.
lThe indoor unit covers are resin made.
Do not apply an excessive force to the resin
covers or make it fall.
lDo not move the louver by hand. If moved,
the louver mechanism will be damaged.
To avoid damage to the resin covers, before lifting
or moving the indoor unit, put a cloth on the resin
covers.
Fixing Screw
(M4)
Position for Fixing Screw
Hooking Plate
Hooks
(3 Portions)
Air Inlet Grille
Side Cove
r
Louver
Lower Cover
Side Cover
Side Cover
Do not handle the side cover.

10 P5416543
4. Indoor Unit Installation
4.1 Factory-Supplied Accessories
Check to ensure that the following accessories are
packed with the indoor unit.
The hose clamp, screws, washers and cord clamps
are put in the pipe insulation.
Table 4.1 Factory-Supplied Accessories
NOTE
lDo not put any foreign material into the
indoor unit and check to ensure that none
exists in the indoor unit before the installation
and the test run. Otherwise, a re or failure,
etc. may occur.
lCheck to ensure that the ceiling is strong
enough. If not strong enough, the indoor unit
may fall down on you.
lDo not install the indoor unit to outdoors.
If installed, an electric hazard or electric
leakage will occur.
Do not install the indoor unit in a ammable
environment to avoid re or an explosion.
• If any of these accessories are not packed with
the unit, please contact your contractor.
• The remote control switch and the branch pipes
are optional accessories which are not included
with the indoor unit.
Accessory Q’ty Purpose Usage
Suspension Bracket 2For Mounting Indoor Unit
Refer to the item 4.3.3.
Washer 8 For Suspension Bracket
Pipe Insulation
(Large) 1
For Refrigerant Piping
Connection
Refer to the item 5.2.2.
Pipe Insulation
(Small) 1
Cord Clamp
(Large) 6For Fixing Insulation
Cord Clamp
(Small) 1For Fixing Plug
Refer to the item 6.
Drain Hose 1 For Connecting Drain Pipe
Hose Clamp 2For Connecting Drain Hose
Insulation 2 For Drain Hose Connection

P5416543 11
4.2 Initial Check
Fig. 4.1 Space around Indoor Unit
• Consider the air distribution from the indoor unit
to the space of the room, and select a suitable
location so that uniform air temperature in the
room can be obtained.
• Avoid obstacles such as electric light, partition
which may hamper the air inlet or the air outlet
ow.
• Check to ensure that the ceiling has a sufcient
strength to hang the indoor unit.
• Do not install the indoor unit in a machinery shop
or kitchen where vapor from oil or its mist ows
to the indoor unit.
An oil will deposit on the heat exchanger,
thereby reducing the indoor unit performance
and the plastic parts may deform, and in the
worst case, break due to splash oil at operation.
• Avoid the installation place where the indoor unit
may contact high humidity.
• The warmed air may stay at the high ceiling
space during the heating operation. Thus, the
parallel installing of a circulator is recommended.
• The indoor unit can be installed up to 3.5 meters
(for 1.5 to 3HP) and 4.3 meters (for 4 to 6HP)
from the oor level.
• Avoid installing the air conditioning where the
direct airow blows from the air outlet to the
temperature detecting devices such an alarm
device or a control device. It may cause a failure
of an alarm device or a control device.
(Total Refrigerant Quantity per one Outdoor Unit)
Volume of the room where this
Indoor Unit is installed.
( ) ≤0.3kg/m3
lCheck to ensure that the number of below
is within 0.3kg/m3. Otherwise it may cause
danger situation if the refrigerant in the
Outdoor Unit leaks into the room where this
Indoor Unit is installed.
In detail, refer to the Installation Manual for
outdoor unit.
l Make sure that the refrigerant leakage
test should be performed. The refrigerant
(Fluorocarbon R410A) for this unit is
incombustible, non-toxic and odorless.
However if the refrigerant is leaked and is
contacted with re, toxic gas will generate.
Also because the uorocarbon is heavier
than air, the oor surface will be lled with it,
which could cause suffocation.
• Install the indoor unit with a proper clearance
around it for operation and maintenance working
space, as shown in Fig. 4.1.
• Do not install ammable parts in the service
space for the indoor unit.
•Install the indoor unit higher than 2.4 meters
from the oor level.
NOTE:
If there is a cornice on the ceiling, measure the dimension from the front or undersurface.
< For Single Installation >
< For Parallel Installation >
Min. 40
Min.
300
Min.
300
(mm)
Min. 40
(mm)
Minimum service space to
tighten the suspension bolt
Min.
300
Min. 400
Min.
500
Min. 8
Minimum service space
for auto louver motor

12 P5416543
4.3 Installation
4.3.1 Position of Suspension Bolts
(1) Determine the nal location and installation
direction of indoor unit with care to the space
for piping and wiring.
(2) After the position of indoor unit is
determined, make holes in the ceiling to
install the suspension bolts.
(3) The position of suspension bolts is shown
below.
• Multiple Combinations
The twin combination, the triple combination and
the quad combination for simultaneous operation
of indoor units are installed in a same room and
required to operate with equal conditions. In the
case of these combination indoor unit types, if
each indoor unit is partitioned by a wall, furniture
or a curtain, etc, it may cause an operation
failure. In addition, in the case of rearranging
furniture or remodeling an interior after the
installation, pay attention to effects for indoor
units combination operation.
• To avoid any corrosive action to the heat
exchangers, do not install the indoor unit in an
acid or alkaline environment.
• The temperature and humidity inside the ceiling
have the potential to exceed 30oC/RH (Relative
Humidity) 80%. Thus, apply additional insulation
materials to the indoor unit external surface to
avoid dew condensation.
• Pay attention to the following points when the
indoor unit is installed in a hospital or other
facilities where there are electronic waves from
medical equipment, etc.
(A) Do not install the indoor unit where the
electromagnetic wave is directly radiated to
the electrical box, remote control cable or
remote control switch.
(B) Install the indoor unit and components as
far as practical or at least 3 meters from the
electromagnetic wave radiator.
(C) Prepare a steel box and install the remote
control switch in it. Prepare a steel conduit
tube and wire the remote control cable in it.
Then, connect the ground wire with the box
and the tube.
(D) Install a noise lter when the power supply
emits harmful noises.
(4) Ceiling Work: It is different depending on
the building structure. Consult with an
architect or an interior nish worker for more
information.
• Do not install electric light units and the
indoor unit to the same furring for ceiling.
If installed, electric lights may icker or
vibrate by the indoor unit operation. When
installing the indoor unit and electric lights,
a furring for ceiling must be separated for
each.
• For the indoor unit with motion sensor, the
detecting area for the motion sensor is shown in
the gure below.
HP A B
1.5, 2 960 916
2.5, 3 1270 1226
4 ~ 6 1580 1536
< Detecting Area >
1.8m
9m
7.2m
Floor-to
-
Ceiling
Height
2.7m
Example for 1.5 to 6HP indoor units
Depth 7m
0.8m from Floor Level
Detecting Area
Detecting Area
120(280)
(22)
A
(B)(22)
( ): Dimension for Suspension Bolt
Upper Surface

P5416543 13
4.3.2 Installation of Suspension Bolts
(1) The structure of suspending part shall
be strong enough. The ductor facilitates
suspending work.
(2) Strengthen suspension bolts with support
plates for the earthquake resistant depending
on the needs of the quakeproof. Apply M10
of suspension bolts and support plates for
the earthquake resistant. (Field-Supplied)
< For Steel Beam >
(2) Hanging Indoor Unit
< A. Hanging Indoor Unit
with Suspension Bracket >
(a) Make holes in the ceiling for suspension
bolts.
(b) Remove the side cover.
To remove the side cover, refer to the
“Handling of Indoor Unit”.
(c) Remove the suspension brackets
attached to the indoor unit.
(d) Fix the suspension brackets to the
suspension bolts. (4 portions)
(e) Mount the indoor unit to the suspension
brackets.
(f) Tighten the 4 nuts and the xing screw for
suspension bracket.
4.3.3 Mounting Indoor Unit
(1) Pattern Board for Installation
The pattern board for the installation is
printed on the packing.
When making holes in wall and ceiling,
the pattern board which hole positions for
suspension, refrigerant pipe and drain pipe
are printed shall be used.
< For Concrete Slab >
Anchor Bolt
Concrete
Steel
150 to 160mm Insert
(100 to 150kg)
(W3/8 or M10)
Upper Cap
The pattern board is
attached in the upper cap.
Washer
Nut
Suspension
Bracket
Suspension
Bolt
Suspension Bolt
Max. 50mm
Tighten accessory
4 nuts (M8).
Nut
(Accessory) Rear Side
of Indoor Unit
(6mm)
Ceiling
Suspension Bolt
I Beam
Suspension Bolt
(W3/8 or M10)
NOTES:
To hang the indoor unit, a strong square
lumber shall be utilized.
Span < 90cm:
Square Lumber larger than 6cm
Span < 180cm:
Square Lumber larger than 9cm

14 P5416543
< B. Hanging Indoor Unit
without Suspension Bracket >
(If there is not enough service space
between the ceiling and the indoor unit, hang
the indoor unit by method A.)
(a) Determine the position to install the
suspension bolt.
(b) Fix the washer and nut to the suspension
bolt.
(c) Mount the indoor unit to the suspension
bolts.
NOTE:
The ceiling surface may not be horizontal.
When the indoor unit is mounted, check
the levelness by a level to be the drain pipe
connection down-slope. If the indoor unit is
mounted with incorrect suspending position,
it may deform and the abnormal vibration
may occur.
(3) When the indoor unit is mounted, create
down-slope toward drain pipe connection
to be well drainage. The right gure shows
the right drain pipe connection. (Before
shipment) For the left drain pipe connection,
create down-slope toward left.
4.3.4 Installation of Remote Control Switch
The installation of remote control switch shall be
performed according to the installation manual of
itself.
(4) Attach the side cover and the supporting
string.
(5) Remove the protection lm attached to the
louver surface.
(6) Remove the protection tape attached to the
air inlet lter.
Ceiling
Suspension Bolt (Field-Supplied)
Nut (Field-Supplied)
Washer (Field-Supplied)
Suspension Bolt
Max. 50mm
Nut (Field-Supplied)
Washer (Field-Supplied)
View from Front
(Drain Pipe Connection)
1 ~ 10mm
from horizontal
View from Right
1 ~ 10mm
from horizontal
Lower the indoor unit
10mm when the optional
drain-up mechanism is
installed.