Hitachi RAC-18MH1, RAS-18MH1, RAS-50FH7, RAC-50YH7, RAC-50YH7A Installation Manual
SPLIT UNIT AIR CONDITIONER
INSTALLATION MANUAL
Indoor Unit Outdoor Unit
RAS-18MH1 RAC-18MH1
● + – Screwdriver ● Measuring Tape ● Knife
●
Saw ● ø 65mm Power Drill ● Hexagonal Wrench
Key ( 4mm) ● Wrench (14, 17, 22, 26, 27mm)
●
Gas Leakage Detector ● Pipe Cutter ● Putty
● Vinyl 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.
!
!
WARNING
!
CAUTION
!
● Please request your sales agent or qualifi ed technician to install your unit. Water leakage, short circuit or fi re 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 fi re.
● 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 power cables approved by the authorities of your country.
● Be sure to use the specifi ed 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 fi re.
● Please use the specifi ed components for installation work. Otherwise, the units may collapse or water leakage, electric shock
and fi re may occur.
● Be sure to use the specifi ed piping set for R-410A. Otherwise, this may result in broken copper pipes or faults.
● When installing or removing an air conditioner, only specifi ed refrigerant (R410A) shall be allowed, do not allow air or moisture
to remain in the refrigeration cycle. Otherwise, pressure in the refrigeration cycle may become abnormally high so that a
rupture may be caused.
● Be sure to ventilate fully if a refrigerant gas leak while at work. If the refrigerant gas comes into contact with fi re, a poisonous
gas may occur.
● After completion of installation work, check to make sure that there is no refrigeration gas leakage. If the refrigerant gas
leaks into the room, coming into contact with fi re in the fan-driven heater, space heater, etc., a poisonous gas may occur.
● Unauthorized modifi cations to the air conditioner may be dangerous. If a breakdown occurs please call a qualifi ed air
conditioner technician or electrician. Improper repairs may result in water leakage, electric shock and fi re, etc.
FOR SERVICE PERSONNEL ONLY
THE CHOICE OF MOUNTING SITE
(Please note the following matters and obtain permission from customer before installation).
WARNING
!
● The unit should be mounted at stable, non-vibratory location
which can provide full support to the unit.
WARNING
!
● The Outdoor unit must be mounted at a location which can support
heavy weight. Otherwise, noise and vibration will increase.
CAUTION
!
● No nearby heat source and no obstruction near the air outlet is
allowed.
● The clearance distances from top, right and left are specifi ed in
fi gure 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 fl uorescent 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.
CAUTION
!
● 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
specifi ed in fi gure below. At least 3 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 fl ammable gas, steam,
oil and smoke.
● The location must be convenient for water drainage.
● Place the Outdoor unit and its connecting cord at least 1m away
from the antenna or signal line of television, radio or telephone.
This is to avoid noise interference.
● Do not install outdoor unit facing strong wind direction. It may
damage the fan motor.
INDOOR UNIT
Figure showing the Installation of
Indoor and Outdoor Unit
OUTDOOR UNIT
Direction of Piping
Dimension of Mounting Stand
of the Outdoor unit
(unit : mm)
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.
● The difference in height
between the indoor and
outdoor unit should be
kept max 10m.
● The connecting pipe,
no matter big or small,
should all be insulated
with insulation pipe and
then wrapped with vinyl
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).
The indoor piping should
be insulated with the
enclosed insulation pipe. (If
the insulator is insuffi cient,
please use commersial
products).
Be sure to
completely
seal any
gap with
putty.
Installation of Hanger, Wall Penetration and Installation of Protection Pipe
1
CAUTION
!
● The draining of the water container inside the indoor unit can be done from the
left. Therefore the hanger must be fi xed horizontally or slightly tilted towards the
side of drain hose. Otherwise, condensed water may overfl ow the water container.
Direct Mounting On The Wall
● Please use hidden beams in the wall to hold the hanger.
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.
Installation of the Indoor Unit
2
VERTICALLY DOWNWARD PIPING
Please pull the lower part of
the Indoor unit outwards to
check if the unit is hooked
onto the hanger. Improper
installation may cause
vibration and noise.
!
CAUTION
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
fi gure 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).
INSTALLATION OF REFRIGERATING PIPES AFTER CONNECTION
● The refrigerating pipes should be adjusted to fi t
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. Then the
pipes are wrapped with insulation pipe.
● Connect the connecting cord after removing electrical
cover. (Refer to “CONNECTION OF POWER CORD”)
● After adjustment, fi t the connecting cord and pipes
into the space available under the indoor unit. Use
holder to hold them tight.
!
CAUTION
●
The rubber strap used for
fi xing the insulator should
not be tied with great force.
Otherwise, this will damage
heat insulation and causes
water condensation.
● Holder can be attached at the either of 2 places.
Please select the easier position.
THE CONNECTION OF REFRIGERATING PIPE DURING THE
INSTALLATION OF INDOOR UNIT
Preparation To Install Refrigerating Pipes
!
CAUTION
● Please fi x in the plastic core
after fl aring 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 fl ow of condensed water of the Indoor
unit during installation. (Carelessness may result in water leakage.)
!
CAUTION
Be sure that the
drain hose is not
loosely connected
or bend.
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.
Unless it seals completely,
any air with high humidity
flows from outdoor and
any dew may drop.
!
WARNING
● The refrigerating pipes and connecting cord
transform and are attached.
● The end of the refrigerating pipes are at locations
marked with “
” symbol.
Installation of Drain Hose
3
INDOOR UNIT
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!
CAUTION
Condensed water may leak out if not inserted properly.
HORIZONTAL & DOWNWARD PIPING – MAKING OPENINGS
● During horizontal or downward piping, use a knife to cut
openings as shown in fi gure. Then smoothen the edges of
openings with a fi le.
● Turn the piping while holding down the lower
portion of pipe-support by hand.
Heat insulation pipe
Connecting
cord
Refrigerating pipe
Pull this to the front
during the connection
of refrigerating pipes
to ease task.
Names of Indoor Components
Hanger
QtyNo. Item
➀
1
Screw for holder of
Remote Controller
(3.1x16)
AAA Size Battery
Holder for Remote
Controller
(4.1x32)
Remote Controller
Purifying Filter
➁
6
➂
1
➃
2
➄
2
➅
➆
1
1
Screw for Hanger
3
Bush
Names of Outdoor Components
QtyNo. Item
➇
Drain Pipe
1
➈
Bush
➉
1
HOW TO REMOVE INDOOR UNIT
● Push up the (PUSH) sections at the
bottom of the indoor unit and pull the
bottom plate towards you. Then the
claws are released from the stationary
plate.
(The (PUSH) sections are indicated by
2 arrows in the right fi gure)
● A circuit breaker or fuse (16A time delay) must be installed. Without a circuit breaker or fuse the danger of electric shock
exists.
A main switch with a contact gap of more than 3mm has to be installed in the power supply line to the outdoor unit.
● Do not install the unit near a location where there is fl ammable gas. The outdoor unit may
catch fi re if fl ammable gas leaks around it.
● Please ensure smooth fl ow of water when installing the drain hose.
● Piping shall be suitable supported with a maximum spacing of 1m between the supports.
Procedures of Installation and Precautions
● Procedures to fi x the hanger.
1. Drill holes on wall. 2. Push plug into the holes. 3. Fix the hanger on wall
(As shown below) (As shown below) with 4.1 x 32 screw
(As shown in fi gure below)
● Procedures to fi x the holder of remote control.
1. Drill holes on wall. 2. Push plug into the holes.
(As shown below) (As shown below)
Preparation
● Connect connecting cord.
● Pull out the pipe, connecting cord and drain hose.
Installation
● The upper part of the Indoor unit is hanged on the hanger.
● The projection at the lower part of the Indoor unit is hooked onto the hanger.
Installation
Hang the Indoor unit onto the hanger. 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.
● Wrap the refrigerating pipes with insulation pipe after
connecting refrigerating pipe.
● Connect the connecting cord after removing electrical cover.
(Refer to “Connection of Power Cord”)
● After adjustment, the connecting cord and refrigerating pipes
are placed into the space available under the Indoor unit.
● The projection of Indoor unit must hook to the hanger.
INS RAS-18MH1-EN1 1INS RAS-18MH1-EN1 1 12/14/13 1:17 PM12/14/13 1:17 PM
OUTDOOR UNIT
● Please mount the Outdoor unit on stable ground to prevent vibration
and increase of noise level.
● Decide the location for piping after sorting out the different types of
pipe available.
● When removing side cover, please pull the handle after undoing the
hook by pulling it downward.
Removal Of Air From The Pipe And Gas Leakage Inspection
Gas Leakage Inspection
Please use gas leakage detector to check if leakage
occurs at the connection of Flare nut as shown on
the right.
If gas leakage occurs, further tighten the connection
to stop leakage. (Use the detector provided for
R410A)
FINAL STAGE OF INSTALLATION
Insulation And Maintenance Of Pipe Connection
1
● The connected terminals should be completely sealed with
heat insulator and then tied up with rubber strap.
● Please tie the pipe and power line together with vinyl tape
as shown in the fi gure showing the installation of Indoor and
Outdoor units. Then fi x 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.
Installation Of Remote Controller
2
Power Source And Operation Test
3
● The remote controller can be placed in its holder which is
fi xed on wall or beam.
● To operate the remote controller at its holder, please ensure
that the unit can receive signal transmitted from the controller
at the place where the holder is to be fi xed. The unit will beep
when signal is received from the remote controller. The signal
transmission is weaken by the fl uorescent light. Therefore,
during the installation of the remote control holder, please
switch on the light, even during day time, to determine the
mounting location of the holder.
Power Source
CAUTION
!
● 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 fi x 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.
<
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The controller must
be hooked onto the
hook at the lower
part of the holder.
Push in the remote
controller in the
direction as shown
in fi gure beside.
3
Procedures of using Vacuum Pump for Air Removal
As shown in right fi gure, remove the cap
of valve core. Then, connect the charge
hose. Remove the cap of valve head.
Connect the vacuum pump adapter to the
vacuum pump and connect the charge
hose to the adapter.
Fully tighten the “Hi” shuttle of the
manifold 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 fl ow of
coolant (using Hexagonal Wrench key).
3
Remove the charge hose and tighten
the cap of valve head. Check the cap’s
periphery if there is any gas leakage.
The task is then completed.
4
1
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 fl aring, please put on the fl are nut.
Pipe Connection
2
INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL
CAUTION
!
Outer
Diameter (mm)
6.35
9.52
12.7
For R410A tool
0.0
~ 0.5mm
0.0
~ 0.5mm
0.0
~ 0.5mm
For R22 tool
A (mm)
AIR REMOVAL
WARNING
●
The naked part of the wire core should be 10 mm and
fi x it to the terminal tightly. 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 power cables approved from the
authorities in your country. For example in Germany:
Cable type: NYM 3x1.5mm
2
(Fuse = 16A time delay).
●
Please refer to the installation manual for wire connection
to the terminals of the units. The cabling must meet the
standards of electrical installation.
●
There is a AC voltage of 220-230V between the L and N
terminals. Therefore, before servicing, be sure to remove
the plug from the AC outlet or switch off the main switch.
Checking for the electric source
and the voltage range
● Before installation, the power source must be checked and
necessary wiring work must be completed. To make the wiring
capacity proper, use the wire gauges list below for the lead-in
from a pole transformer and for the wiring from a switch board
of fuse box to the outlet in consideration of the locked rotor
current.
● Investigate the power supply capacity and other electrical
conditions at the installation location.
Depending on the model of room air conditioner to be
installed, request the customer to make arrangements
for the necessary electrical work etc.
The electrical work includes the wiring work up the
outlet. In localities where electrical conditions are poor,
use of a voltage regulation is recommended.
● Install outlet for the room air conditioner within the
reaching range of the line cord.
IMPORTANT
Cable length
up to
16m
up to 15m
up to 25m
Wire cross-section
1.5mm
2
2.5mm
2
4.0mm
2
IMPORTANT
● THIS APPLIANCE MUST
BE EARTHED.
Procedures of Wiring
!
WARNING
!
CONNECTION OF POWER CORD
WARNING
!
Please face this side (suction
side) of the unit to the wall.
Please remove side cover
when connecting the piping
and connecting cord.
Pull downward
● Recommend to use
R410A fl aring tool.
CAUTION
!
In case of removing fl are nut of an Indoor unit, fi rst remove a nut
of small diameter side, or a seal cap of big diameter side will fl y
out. Prevent water from entering into the piping when working.
When the meter reaches - 101KPa
(-76cmHg) during pumping, fully
tighten the shuttle.
Meter showing pressure
When pumping starts, slightly loosen the
fl are nut to check of air sucked in. Then
tighten the fl are nut.
Earth terminal
N
L
CD
CONDENSED WATER DISPOSAL OF OUTDOOR UNIT
There are holes on the base of Outdoor unit for condensed
water to exhaust.
In order to fl ow condensed water to the drain, the unit is installed on a
stand or a block so that the unit is 100mm above the ground as shown
fi gure. Join the drain pipe to one hole.
At fi rst 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 fi rmly.
When Using and Installing In Cold Areas
When the air conditioner is used in low temperature and in snowy
conditions, water from the heat exchanger may freeze on the base surface
to cause poor drainage. When using the air conditioner in such areas, do
not install the bushings. Keep a minimum of 250mm between the drain
hole and the ground. When using the drain pipe, consult your sales agent.
For more details, refer to the installation Manual for Cold Areas.
A
1.0mm
1.0mm
1.0mm
Lo Hi
Wiring Of The Indoor Unit
●
For wire connection of the Indoor unit, you need to remove
front panel and electrical cover.
Method to remove front panel
●
Refer to “FINAL STAGE OF INSTALLATION – How to Remove
The Front Cover”.
Outer
dia.of pipe
6.35 (1/4")
9.52 (3/8")
12.7 (1/2")
6.35 (1/4")
9.52 (3/8")
12.7 (1/2")
Valve
head cap
Torque N·m
(kgf · cm)
13.7 – 18.6 (140 – 190)
34.3 – 44.1 (350 – 450)
44.1 – 53.9 (450 – 550)
19.6 – 24.5 (200 ~ 250)
19.6 – 24.5 (200 ~ 250)
29.4 – 34.3 (300 – 350)
12.3 – 15.7 (125 ~ 160)
Small dia. side
Large dia. side
Valve core cap
Small dia. side
Large dia. side
Power supply shall be connected at the rated voltage, otherwise
the unit will be broken or could not reach the specifi ed capacity.
Outdoor Unit
GRN + YEL
Strip wires
Power line Control line
GRN + YEL
Strip wires
Indoor Unit
Detail of cutting the
connecting cord
When removing the
connecting wires for
the Indoor unit, please
remove the low cover
panel in front of the
unit.
● If you cannot attach the side plate due
to the connecting cord, please press the
connecting cord in direction to the front
panel to fi x it.
● Be sure that the hooks of the side plate is
fi xed in certainly. Otherwise water leakage
may occur and this causes short circuit or
faults.
● The connecting cord should not touch to
service valve and pipes. (It becomes high
temperature in heating operation.)
Wiring of The Outdoor Unit
● Please remove the side plate for wire connection.
Fuse Capacity
16A time delay fuse
How to Remove The Front Cover
1 Remove the front panel.
● Please remove and attach the front panel by both hands.
● After opening the front panel by both hands.
➀ Undo the right arm while pushing it inside.
➁ Slide the front panel to right as shown in fi gure. Then
remove while pulling it to front.
2 Remove the fi lters.
3 After removing two screws, pull the center of the front
cover towards you and release the claws.
4 Pull the side faces (lower sections) of the front cover
towards you as shown in the fi gure and remove the
cover.
How to Attach the Front Cover
1 Check that the drain pan is securely attached.
2 After installing the front cover onto the unit, hook three
claws at upper side of the cover securely. Then, push
the center of the front cover to lock the claws.
3 Tighten the two screws.
4 Install the fi lter.
5 Slide the shafts of the right and left arms on the washable
panel along the steps to insert the shafts into the holes
till they stop. After checking that the shafts are securely
inserted, close the panel.
Method to remove the low cover
● Pull the cover at 1 and 2
in the directions as shown by
arrows to remove the cover.
After remove the screw
and cover, and put the
connecting cords and fi x
the cover with screw.
DRAIN PIPE
[For all optional part, please refer catalog for part number]
As for connecting to H-Link, a separately purchased
RAC Adapter is required.
● To install the wiring the electrical box cover must be opened.
● Connect the connector of RAC adapter to CN7.
● Assemble back the cover of electrical box.
● Please refer to the respective user manual of RAC Adapter
for further details.
● Please be careful not to damage lead wires by edge of
plate when connecting the optional parts.
[For all optional part, please refer catalog for part number]
Connection to the electrical box:
● Remove the cover of electrical box.
● Connect the connector of Weekly Timer/wired remote
controller to CN9.
● Assemble back the cover of electrical box.
● Please refer to the respective user manual of Weekly Timer/
wired remote controller for further details.
● Please be careful not to damage lead wires by edge of
plate when connecting the optional parts.
WEEKLY TIMER / WIRED REMOTE CONTROLLER
H-LINK
How To Connect The Optional Parts
(RAC Adapter, Weekly Timer, Wired Remote Control)
CN7
RAC Adapter
cord
CN9
Weekly timer cord/
Wired remote
controller cord
Connect the
earth cord
Closed
R410A
Manifold valve
Valve
Charge hose
Valve
Vacuum pump
adapter
Vacuum
pump
BASE
INS RAS-18MH1-EN2 1INS RAS-18MH1-EN2 1 12/14/13 1:45 PM12/14/13 1:45 PM
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