Hitachi RAK-18QPA, RAK-25QPA, RAK-35QPA, RAK-50QPA Installation Manual
SPLIT UNIT AIR CONDITIONER
INSTALLATION MANUAL
Indoor Unit
● + – 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 quali ed technician to install your unit. Water leakage, short circuit or 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 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 speci 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 re.
● Please use the speci ed components for installation work. Otherwise, the units may collapse or water leakage, electric shock
and re may occur.
● Be sure to use the speci ed piping set for R-410A. Otherwise, this may result in broken copper pipes or faults.
● When installing or removing an air conditioner, only speci 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 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 re in the fan-driven heater, space heater, etc., a poisonous gas may occur.
● Unauthorized modi cations to the air conditioner may be dangerous. If a breakdown occurs please call a quali ed air
conditioner technician or electrician. Improper repairs may result in water leakage, electric shock and 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.
CAUTION
!
● No nearby heat source and no obstruction near the air outlet is allowed.
● The clearance distances from top, right and left are speci ed in 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
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.
INDOOR UNIT
Figure showing the Installation of
Indoor and Outdoor Unit
Installation of Mounting Plate, 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 mounting plate must be xed horizontally or slightly tilted towards the
side of drain hose. Otherwise, condensed water may over ow 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.
Installation of the Indoor Unit
2
VERTICALLY DOWNWARD PIPING
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 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.
!
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
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 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, 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
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 x in the plastic core
after 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 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
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.
● 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 mounting plate.
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 gure. Then smoothen the edges of
openings with a 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
Mounting Plate
QtyNo. Item
1
Screw for Remote
Controller Holder
AAA Size Battery
Remote Controller Holder
(4.1x32)
Remote Controller
Air Purifying Filter
6
1
2
2
1
2
Screw for Mounting Plate
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 gure)
Procedures of Installation and Precautions
● Procedures to x the mounting plate.
1. Drill holes on wall. 2. Push plug into the holes. 3. Fix the mounting plate on
(As shown below) (As shown below) wall with 4.1 x 32 screw
(As shown in gure below)
● Procedures to x the holder of remote control.
1. Drill holes on wall. 2. Push plug into the holes.
(As shown below) (As shown below)
● 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 ammable gas. The outdoor unit may
catch re if ammable gas leaks around it.
● Please ensure smooth ow of water when installing the drain hose.
● Piping shall be suitable supported with a maximum spacing of 1m between the supports.
Level
Mounting plate
Hole for pipe
Line
Weight
Mark
Screw for Mounting Plate
Please use more than
4 screws.
Plug
Screw
Remote
Control
Holder
20mm
ø4.4mm
ø4.8mm
Wall
Wall
32mm
Wall
Mounting plate
Screw
Plug
4.1 x 32 Screw
above 50mm
Ceiling
1
2
3
5
Indoor
Outdoor
WALL
Sleeve of
protection pipe
Protection
pipe
Seal with
putty
Seal with
putty
2 ~ 5mm
Connecting cords, pipe and
drain hose must be laid
together with Vinyl tape.
Mounting plate
Drain Hose
Protection
Pipe
Refrigerating
Pipe
Connecting
Cord
Lift the body
of the unit
upwards and
then force it
downwards.
Mounting plate
Projection
[Push] mark positions
Drain cap
Please insert
until here
Drain hose
Please insert
until here
Drain cap
Drain hose
Openings
Pull up the pipe
after bending
downward
Pipe
support
Drain hose
Connecting cord
Pipe
Insulation pipe (must be wrapped with
vinyl tape at every 120mm).
Holder
Pipe
Rubber strap tied with great force
Please bend at a small
radius to form an arc
below
5mm
Projection
Hook
about 15cm
Protection pipe
Drain hose
Connecting cord
Holder
Connected
section
Bending
upwards
Condensed
water pond
Ditch
Condensed
water pond
RAK-18QPA
RAK-25QPA
RAK-35QPA
RAK-50QPA
Be sure to
completely
seal any
gap with
putty.
The connection of insulated drain hose.
Please use insulated drain hose for
the indoor piping (commercial product).
● The difference in height between the indoor and outdoor
unit should be kept max 20m.
● 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 indoor piping should
be insulated with the
enclosed insulation
pipe. (If the insulator is
insufficient, please use
commercial products).
Direction of Piping
There are 6 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.
Horizontally
perpendicular
to the unit
Connection
Removal Of Air From The Pipe And Gas Leakage Inspection
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 gure showing the installation of Indoor and
Outdoor units. Then 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
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 xed. The unit will beep
when signal is received from the remote controller. The signal
transmission is weaken by the 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 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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3
Procedures of using Vacuum Pump for Air Removal
As shown in right 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” knob of the manifold valve and completely unscrew the “Lo” knob.
Run the vacuum pump for about 10~15 minutes, then completely tighten the “Lo” knob
and switch off the vacuum pump.
Remove the charge hose and tighten the cap of valve core. Check the cap’s periphery
if there is any gas leakage.
Completely unscrew the spindle of the service valve (at 2 places) in anti-clockwise
direction to allow the ow of refrigerant (using Hexagonal Wrench key).
Re-cap the service valve and tighten using wrench. Check the cap’s periphery if there
is any gas leakage. The task is then completed.
Preparation of Pipe
1
● Use a pipe cutter to cut the copper pipe.
Pipe Connection
2
INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL
AIR REMOVAL
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 main switch
and outdoor unit in consideration of the locked rotor current.
● THIS APPLIANCE MUST BE
EARTHED.
Procedures of Wiring
In case that power is supplied from Indoor Unit
CONNECTION OF POWER CORD
WARNING
!
● Recommend to use
R410A aring tool.
CAUTION
!
In case of removing are nut of an Indoor
unit, rst remove a nut of small diameter
side, or a seal cap of big diameter side will
y out. Prevent water from entering into the
piping when working.
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”.
Power supply shall be connected at the rated voltage, otherwise the
unit will be broken or could not reach the speci ed capacity.
● Jagged edge will cause leakage.
● Point the side to be trimmed downwards during trimming
to prevent copper chips from entering the pipe.
● Before aring, please put on the are nut.
CAUTION
!
1
2
3
4
5
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. (Be sure to use R410A detector)
GRN + YEL
Strip wires
30mm
10mm
10mm
0mm
● The naked part of the wire core should be 10 mm and 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
.
● 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 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.
WARNING
!
IMPORTANT
Cable length
up to
16m
up to 15m
up to 25m
Wire cross-section
1.5mm
2
2.5mm
2
4.0mm
2
Indoor Unit
Outer
Diameter
mm (inch)
6.35 (1/4")
9.52 (3/8")
12.70 (1/2")
15.88 (5/8")
1.0~1.5
1.0~1.5
1.0~1.5
1.0~1.5
Clutch type
A (mm)
1.5~2.0
1.5~2.0
1.5~2.5
1.5~2.5
Wing nut type
Thickness
(mm)
0.8
0.8
0.8
1.0
0.0
~ 0.5
0.0
~ 0.5
0.0
~ 0.5
0.0
~ 0.5
Flare tool for R410A
Clutch type
Conventional are tool
Trimming tool
Copper pipe
Die
Die
Copper pipe
Outer
dia.of pipe
6.35 (1/4")
9.52 (3/8")
12.70 (1/2")
15.88 (5/8")
6.35 (1/4")
9.52 (3/8")
12.7 (1/2")
Valve
head cap
Torque N·m
(kgf
·
cm)
14.0 – 18.0 (140 – 180)
33.0 – 42.0 (330 – 420)
50.0 – 62.0 (500 – 620)
63.0 – 77.0 (630 – 770)
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
When the meter reaches - 101KPa
(-76cmHg) during pumping, fully
tighten the shuttle.
Closed
R410A
Valve
Charge hose
Vacuum pump
adapter
When pumping starts, slightly loosen the
are nut to check of air sucked in. Then
tighten the are nut.
Lo Hi
Vacuum
pump
Manifold valve
Meter showing pressure
Valve
Cap of valve head
Cap of valve head
The body of
service valve
Hexagonal
Wrench Key
Cap of valve
core
[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 wired remote controller to CN9.
● Assemble back the cover of electrical box.
● Please refer to the respective user manual of wired remote
controller for further details.
● Please be careful not to damage lead wires by edge of
plate when connecting the optional parts.
WIRED REMOTE CONTROLLER
H-LINK
How To Connect The Optional Parts
(RAC Adapter, Wired Remote Control)
CN7
RAC Adapter cord
CN9
Wired remote
controller cord
Wired remote controller
RAC Adapter
Connect the
earth cord
After remove the screw
and cover, and put the
connecting cords and x
the cover with screw.
The remote controller
must be slide in
the remote controller
holder, in the direction
as shown in the gure,
until it hooks at the
lower end of the remote
controller holder.
Screw (2 pieces)
Remote
Controller
Holder
Remote
Controller
How to remove the Front Cover
1 Remove the front panel.
● Pull up the front panel
by holding it at both lower
sides with both hands.
● When the front panel full
open, pull the inner part of
the right arm outward and
pull the panel forward while
closing it gradually.
2 Remove the pre- lters.
● Push upward to release the claws and pull out the Pre-
lter.
3 After removing two caps and two screws, rotate the
horizontal louver towards you a bit. Then, pull the center
of the front cover to release the claws.
4 Pull the side faces (lower sections) of the front cover
towards you as shown in the gure and remove the cover.
How to attach the Front Cover
1 Check to ensure that the drain pan is securely attached.
2 To install the front cover onto the unit, push two points
from the center to lock the two claws in the direction as
shown in the image below. Then, hook the four claws at
upper side of the front cover securely.
3 Tighten the two screws, then attach the two caps.
4 Install the pre- lters.
5 Slide the shafts on the left then on the right arms of the
front panel along the step on the front cover. Please insert
the shafts into the holes untill they stop. After checking
the shafts are securely inserted, close the front panel.
Claw
View A
View A
Hole
Shaft
Front panel
Pre- lter
Horizontal louver
Cap
Screw
Claw
After insertion
Before insertion
Claws
Screw
Cap
Front cover
Method to remove the low cover
● Pull the cover at
1
and 2 in the directions as
shown by arrows to remove the cover.
SWITCH SETTING TO SELECT 1.8kW
OR 1.2kW CAPACITY
!
CAUTION
Before setting the switch, make sure to turn OFF power
supply and then set the position of the switch otherwise
will cause damage to the Main PCB.
1.2kW
1.8kW
SWITCH POSITION
CAPACITY SELECTION
NOTE:
FACTORY default setting is at 1.8kW capacity.
This setting is applicable for RAK-18QPA only.
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