Hitachi RAS-ME14HA, RAC-ME10HZ, RAS-ME10HA, RAS-MES10HA, RAS-MES14HA Installation Manual

Screw for Hanger

(Φ4x35)

HITACHI SPLIT-UNIT AIR CONDITIONER

INSTALLATION MANUAL

+ – Screwdriver Measuring Tape Knife
Saw ø 65mm Power Drill Allen Key ( 4mm)
Wrench (14, 17, 19, 22mm)
Gas Leakage Detector Pipe Cutter
Plastic Tape Pliers Flare Tool

Carefully read through the procedures of proper
installation before starting installation work.
The sales agent should inform customers regarding
the correct operation of installation.

Tools Needed For Installation Work

SAFETY PRECAUTION

Read the safety precautions carefully before operating the unit.
The contents of this section are vital to ensure safety. Please pay special attention to the following sign.

WARNING ........ Incorrect methods of installation may cause death or serious injury.

CAUTION ......... Improper installation may result in serious consequence.

Be sure that the unit operates in proper condition after installation. Explain to customer the proper way of operating
the unit as described in the user’s guide.

Be sure to use the earth line. Do not place earth line near gas or water pipes, lightning conductor
and the earth line of telephone. Improper earthing may cause electric shocks.

A circuit breaker should be installed depending on the mounting size of the unit. Without a circuit breaker, the
danger of electric shock exists.

Do not install the unit near a location where there is flammable gas. The outdoor unit may
catch fire if flammable gas leaks around it.

Please ensure smooth flow of water when installing the drain hose.

Please request your sales agent or qualified technician to install your unit. Water leakage, short circuit or fire may
occur if you do the installation work yourself.

Please observe the instructions stated in the installation manual during the process of installation. Improper
installation may cause water leakage, electric shock and fire.

Make sure that the units are mounted at locations which are able to provide full support to the weight of the units.
If not, the units may collapse and impose danger.

Observe the rules and regulations of the electrical installation and the methods described in the installation manual
when dealing with the electrical work. Use wire which is specified for the air conditioner. A short circuit and fire
may occur due to the use of low quality wire or improper work.

Be sure to use the specified wire for connecting the indoor and outdoor units. Please ensure that the connections
are tight after the conductors of the wire are inserted into the terminals. Improper insertion and loose contact may
cause over-heating and fire.

Please use the specified components for installation work. Otherwise, the units may collapse or water leakage,
electric shock and fire may occur.

Do not mix any coolant other than R-22 into the cooling

circulation path when mounting or shifting the unit. If it
is mixed with air, the high pressure in the circulation path will rise and this may result in broken copper pipes or
faults.

THE CHOICE OF MOUNTING SITE (Please note the following matters and obtain permission from customer before installation).

The unit should be mounted at stable, non-vibratory location which
can provide full support to the unit.

The outdoor unit must be mounted at a location which can sup­port heavy weight. Otherwise, noise and vibration will increase.

No nearby heat source and no obstruction near the air outlet is
allowed.
The clearance distances from top, right and left are specified in
figure below.
The location must be convenient for water drainage and pipe
connection with the Outdoor unit.
To avoid interference from noise please place the unit and its
remote controller at least 1m from the radio, television and inverter
type fluorescent lamp.
To avoid any error in signal transmission from the remote controller,
please put the controller far away from high-frequency machines
and high-power wireless systems.
The installation height of indoor unit must be 2.3m or more in a
non public area.

Do not expose the unit under direct sunshine or rain. Besides,
ventilation must be good and clear of obstruction.
The air blown out of the unit should not point directly to animals
or plants.
The clearances of the unit from top, left, right and front are specified
in figure below. At least three of the above sides must be open
air.
Be sure that the hot air blown out of the unit and noise do not
disturb the neighbourhood.
Do not install at a location where there is flammable gas, steam,
oil and smoke.
The location must be convenient for water drainage.
Place the outdoor unit and its connection wire at least 1m away
from the antenna or signal line of television, radio or telephone.
This is to avoid noise interference.

TINUROODNI

Names of Indoor Components

The Length of Indoor Unit

Power Cord

Do not alter the power cord.

Direction of Piping

Figure showing the Installation
of Indoor and Outdoor Unit.

TINUROODTUO

There are 4 directions
allowed, namely, horizontally
perpendicular to the unit,
vertically down from right,
horizontally out from right and
horizontally out to left.
Don't form the piping
downward at the left of the unit.

Installation of Mounting Plate, Wall Penetration and Installation of Protection Pipe

1

The draining of the water container inside the indoor unit can be done from the left.
Therefore the mounting plate must be fixed horizontally or slightly tilted towards the
side of drain hose. Otherwise, condensed water may overflow the water container.

Direct Mounting On The Wall

Please use hidden beams in the wall to hold the mounting plate.

Wall Penetration and Installation of Protection Pipe

Drill a ø 65mm hole on wall
which is slightly tilted
towards the outdoor side.
Drill the wall at a small angle.
Cut the protection pipe
according to the wall
thickness.
Empty gap in the sleeve of
protection pipe should be
completely sealed with putty
to avoid dripping of rain
water into the room.

Procedures of Installation and Precautions

Procedures to fix the mounting plate.

1.Drill holes on wall. 2.Fix the mounting plate on
(As shown below)

wall with 4.1 x 32 screw
(As shown in figure below)

Installation of the Indoor Unit

2

VERTICALLY DOWNWARD PIPING

Preparation

Connect power cord.
Pull out the pipe, power cord and drain hose.

Installation

The upper part of the indoor unit is hanged
on the mounting plate.
The projection at the lower part of the indoor
unit is hooked onto the mounting plate.

Please pull the lower part
of the indoor unit
outwards to check if the
unit is hooked onto the
mounting plate. Improper
installation may cause
vibration and noise.

HORIZONTAL PIPING

Preparation

Change of Drain Hose and Installation Procedures.

Exchange the location of drain hose and drain cap during horizontal piping as shown
in figure below. Be sure to plug in the drain hose until the insulating material folds upon
itself.

Please use pliers to pull out the drain cap.
(This is an easier way to remove the drain cap).

HORIZONTAL & DOWNWARD PIPING – MAKING OPENINGS

During horizontal or downward piping, use a knife to cut
openings as shown in figure. Then smoothen the edges
of openings with a file.

INSTALLATION OF COOLANT PIPES AFTER CONNECTION

The coolant pipes should be adjusted to fit into the
hole on the wall and then ready for further connection.
The terminals of 2 connected pipes must be covered
with insulator used for terminal connection.
Connect the power cord.
After adjustment, fit the power cord and pipes into
the space available under the indoor unit.

The rubber strap used for
fixing the insulator should
not be tied with great force.
Otherwise, this will damage
heat insulation and causes
water condensation.

THE CONNECTION OF COOLANT PIPE DURING THE
INSTALLATION OF INDOOR UNIT

Preparation To Install Coolant Pipes

Please fix in the plastic
core after flaring to avoid
plastic chips entering the
pipes.

CAUTION

You are free to choose the side (left or right) for the installation of drain
hose. Please ensure the smooth flow of condensed water of the indoor
unit during installation. (Carelessness may result in water leakage.)

Be sure that the
drain hose is not
loosely connected
or bent.

Be sure that the wire is not
in contact with any metal
in the wall. Please use the
protection pipe as wire
passing through the hollow
part of the wall so as to
prevent the possibility of
damaged by mouse.

Coolant pipes and power cord must be tied together.
The front part of the coolant pipes are at locations
marked with “ ” symbol.

Installation of Drain Hose

3

Pull this to the front
during the connection
of coolant pipes to
ease task.

Installation

Hang the indoor unit onto the mounting plate. Use the temporary
stand at the back of the indoor unit to push its lower part 15cm
forwards.

Place the drain hose through the hole on the wall.
Insulate the connecting portion of coolant pipe with insulator.
Connect the power cord.
After adjustment, the power cord and coolant pipes are placed
into the space available under the indoor unit.
The projection of indoor unit must hook to the mounting
plate.

TINUROODNI

AAA Size Battery

Hanger

QtyNo. Component’s Name

1

6

2

Remote Controller

Bush

about 1.6m

about

0.9m

20

Cut away shaded
portion, and finish
the edge of the
opening so that
there is no burr.

Connection

Horizontally
perpendicular
to the unit

Pipe

Power cord

Drain hose

Pipe

Rubber strap tied with great force

Pipe

below
5mm

Please bend at a small
radius to form an arc

about 15cm

Projection

Temporary stand

Hook

Power cord

Protection
pipe

Drain
hose

Connected
terminals
of coolant
pipes

Coolant pipes

Power cord

Heat insulation
pipe

Bending
upwards

Stagment
water

Drain

Stagment
water

Openings

Drain cap

Please insert
until here

Drain hose

Please insert
until here

Mounting Plate

Hook

Coolant pipe

Power Cord

Drain Hose

Protection
Pipe

Lift the body
of the unit
upwards and
then force
it downwards.

Mounting
Plate

Projection

Power line, pipe and
drain hose must be
tied together with
plastic tape.

2~5mm

Protection
pipe

Outdoor

Indoor

Seal with
putty

Sleeve of
protection
pipe

WALL

Remove the cap for drain hose installation

Drain cap

Drain hose

Drain hoseDrain cap

Condensed water may leak out if not inserted properly.

Pipe
support

Pull up the pipe after
bending downward

Transform the piping while holding down the lower portion
of pipe-support by hand.

Indoor Unit

Outdoor Unit

RAS-ME10HZ

RAC-ME10HZ

+

RAS-ME14HZ

RAC-ME14HZ

+

In case the pipe length is more than 5m, add refrigerant R22 at
20 gram (

ME14HZ

)/15 gram (

ME10HZ

) per every meter exceeds.

1

2

3

4

5

1

1

WARNING

CAUTION

WARNING

CAUITON

WARNING

CAUITON

CAUITON

Level

Line

Hole for
pipe

Mark

Screw for Mounting plate

Please use more
than 4 screws.

Mounting
Plate

0.85m

CAUITON

CAUITON

CAUITON

CAUITON

CAUITON

CAUITON

CAUITON

External dimension of

indoor unit

450mm

400mm
316mm

20mm

125mm
44mm

42mm

390mm
530mm
780mm

80mm

65mm

45mm

10mm

65mm

65mm

125mm

199mm

280mm

41mm

45mm

wall nole

wall nole

Drain HoseDrain Hose

Dimension of Mounting Stand of the outdoor unit

500

698

45

300

282

257

The difference in height
between the indoor and
outdoor unit should be
kept below 5m.
The connecting pipe, no
matter big or small,
should all be insulated
with insulation pipe and
then wrapped with plastic
tape. (The insulator will
deteriorate if it is not
wrapped with tape).

The connection of insulated
drain hose.

Please use insulated drain
hose for the indoor piping
(commercial product).

Be sure to
completely
seal any
gap with
putty.

about 0.45m

Maximum pipe

length 10m

above 300mm

must not bend

above 50mm

above 250mm

above 100mm

RAC-ME14HZ

RAC-ME10HZ

ME10HZ

ME14HZ

8m

10m

(For ME10HZ)

(For ME14HZ)

UNIT OUTDOOR

Please mount the outdoor unit on stable ground

There are holes on the base of outdoor unit for
condensed water to exhaust.

In order for condensed water to flow to the
draining part, installed the unit on the level
ground or block so that the unit is 70mm above

the ground,same as figure shown.Join the drain
pipe to one hole.
At first insert one portion of the hook to the
base(Portion A), then pull the drain pipe in the
direction shown by the arrow while inserting the
hook into the base. After installation, check
whether the drain pipe cling to the base firmly.

to prevent vibration and increase of noise level.

Decide the location for piping after sorting out

the different types of pipe available.

Removal Of Air From The Pipe And Gas Leakage Inspection Preparation of Pipe

1

Use a pipe cutter to cut the copper pipe.

Jagged edge will cause leakage.
Point the side to be trimmed downwards during trimming to prevent copper chips from
entering the pipe.

Before flaring, please put on the hexagon screw cap.

Spanner

Torque
wrench

Hexagon
screw nut

Pipe Connection

2

Please be careful when bending the copper pipe.
Applied frozen grease to the connection points and then screw in manually. After that, use
a torque wrench to tighten the connection.

INSTALLATION OF COOLANT PIPES AND AIR REMOV LA

Procedures of using Vacuum Pump for Air Removal

3

REMOVAL AIR

Outer

diameter

of pipe

6.35 (1/4")

9.52 (3/8")

Valve head cap

Valve core cap

Torque N·m

(kgf · cm)

13.7 – 18.6 (140 – 190)

34.3 – 44.1 (350 – 450)

12.7 (4/8") 44.1 – 53.9 (450 – 550)

19.6 – 24.5 (200 – 250)

12.3 – 15.7 (125 – 160)

Small diameter side

Big diameter side

Lo

Hi

As shown in figure on the right, remove
the cap of valve head and valve core
and then connect them to the vacuum
pump and sub-division valve.

Fully tighten the “Hi” shuttle of the sub­division valve and completely unscrew
the “Lo” shuttle. Run the vacuum pump
for about 10–15 minutes, then completely
tighten the “Lo” shuttle and switch off
the vacuum pump.

2

Completely unscrew the spindle of the
service valve (at 2 places) in anti­clockwise direction to allow the flow of
coolant (using Allen key).

3

Remove the connection pipe and tighten
the cap of valve head. The task is then
completed.

4

Gas Leakage Inspection

Please use gas leakage detector to check if leakage occurs at
the connection of hexagon screw nut as shown on the right.

If gas leakage occurs, further tighten the connection to stop
leakage.

The body of
service valve

Cap of
valve core

Allen key

Cap of valve head

Cap of valve head

A

Mould

Mould

Copper pipe

Copper pipe

Trimming tool

Outer

Diameter (ø)

6.35 (1/4")

9.52 (3/8")

Imperial flaring tool

0.8 – 1.5

1.0 – 1.8

Rigid flaring tool

0 – 0.5

12.7 (4/8") 1.2 – 2.0 0 – 1.0

0 – 0.5

A (mm)

1

CONNECTION OF POWER CORD

The naked part of the wire core should be 14 mm and the insulated part of the wire must be push into the terminal for 3 – 4 mm.
Then try to pull the individual wire to check if the contact is tight. Improper insertion may burn the terminal.
Be sure to use only wire specified for the use of air-conditioner.
Please refer to the installation manual for wire connection and the wiring technique should meet the standards of electrical
installation.
There is a AC voltage drop between the AB terminals if the power is on. Therefore, be sure to remove the plug from its socket.

FINAL STAGE OF INSTALLATION

Insulation And Maintenance Of Pipe Connection

1

The connected terminals should be completed sealed with

heat insulator and then tied up with rubber strap.

Please tie the pipe and power line together with plastic tape

as shown in the figure of installation of both the indoor and

outdoor units. Then fix their position with holders.

To enchance the heat insulation and to prevent water

condensation, please cover the outdoor part of the drain hose

and pipe with insulation pipe.

Completely seal any gap with putty.

Earth Line And Circuit Breaker

2

Power Source And Operation Test

3

The earth line terminal of the outdoor unit is below the
service valve.
To avoid short circuit, it is necessary to install circuit breaker
depending on the mounting location of the unit.
Do not place earth line near the following objects:
(1) Water pipe
(2) Gas pipe — There is danger of catching fire.
(3) The earth line of lightning conductor and telephone —

short circuit may occur during lightning.

Power Source

Do not alter the plug of power cord.
Do not make extension to the power cord.

Please use a new socket. Accident may occur due to the
use of old socket because of poor contact.
Please plug in and then remove the plug for 2 – 3 times.
This is to ensure that the plug is completely plugged into
the socket.
Keep additional length for the power cord and do not render
the plug under external force as this may cause poor
contact.
Do not fix the power cord with U-shape nail.

Operation Test

Please ensure that the air conditioner is in normal operating
condition during the operation test.
Explain to your customer the proper operation procedures
as described in the user’s manual.

Insulation material for pipe connection

Sleeve of
protection pipe

Putty

WARNING

You may not be able to close the side cover
due to the connecting cord, under such
situation, please press against the wait of
side cover to fix it.

Be sure that the hooks (2 places) are
plugged in.
Otherwise, water leakage may occur and this
causes short circuit or faults.

THIS APPLIANCE MUST BE EARTHED.

Procedures of Wiring

Wiring Of The Outdoor Unit

Please remove the side cover for wire connection.

Power supply shall be connected at the rated voltage, otherwise the unit will be broken or could not reach the specified capacity.

Wiring Of The Indoor Unit

Procedures of Removing the Wire Connection Cover
Pull the hooks at positions 1 and 2 of the s-cover of the air outlet on the right bottom of front cover in the directions as shown by

arrows to remove the s-cover.

Procedures of Wiring
Open the front panel, loosen and remove the screw at the electric box cover located at the right side of front cover.
Loosen and remove the screw fixing inner cover (sheet metal).
After inserting the connecting cords from the s-cover of air outlet, bend the tips of connecting cords as shown in the figure below.
Fix the cords securely to the inner cover (sheet metal) according to their respective colors. (Tightening torque: 5kgf·cm).
After the wiring is done, reinstall the inner cover (sheet metal) and the electric box cover accordingly.

CAUITON

WARNING

WARNING

CAUITON

WARNING

CAUTION

CONDENSED WATER DISPOSAL OF OUTDOOR UNIT

RAC-ME10HZ

RAC-ME14HZ

RAC-ME10HZ

RAC-ME14HZ

5~10mm

FNL

D

1

2

Yellow/green lines grounding

Wire clamp for

power cord

Inner Cover (sheet metal)

S-cover

white black red

yellow

yelloweulbder

brown

Electric Box Cover

5

5

5