HITACHI CEILING CASSETTE-UNIT AIR
CONDITIONER INSTALLATION MANUAL
Indoor Unit
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+ – Screwdriver
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Measuring Tape
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Knife
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Saw
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ø 65mm Power Drill
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Hexagonal Wrench Key ( 4mm)
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Wrench (14, 17, 19, 22, 26, 27mm)
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Gas Leakage Detector
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Pipe Cutter
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Vinyl Tape
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Pliers
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Flare Tool
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Carefully read through the procedures of proper installation
before starting installation work.
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The sales agent should inform customers regarding the correct
operation of installation.
Tools Needed For Installation Work
SAFETY PRECAUTION
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Read the safety precautions carefully before operating the unit.
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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
!
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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 3.5mm has to be installed in the power supply line to the outdoor unit.
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Piping shall be suitable supported with a maximum spacing of 1m between the supports.
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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.
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For installation of front panel RAI-ECPP, please follow exactly the instruction in the manual.
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Please ensure smooth ow of water when installing the drain hose.
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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 y
ourself
.
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Please observe the instructions stated in the installation manual during the process of installation. Improper installation may cause water leakage, electric
shock and re.
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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.
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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.
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Be sure to use speci ed wire for the connection 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.
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Please use the speci ed components for installation work. Otherwise, the units may collapse or water leakage, electric shock and re may occur.
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Be sure to use the speci ed piping set for R-410A. Otherwise, this may result in broken copper pipes or faults.
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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.
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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.
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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.
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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.
THE CHOICE OF MOUNTING SITE
(Please note the following matters and obtain permission from customer before installation).
WARNING
!
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The unit should be mounted at stable, non-vibratory location which can provide full support to the unit.
CAUTION
!
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No nearby heat source and no obstruction near the air outlet is allowed.
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The clearance distances from top, right and left are speci ed in gure below.
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The location must be convenient for water drainage and pipe connection with the outdoor unit.
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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.
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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.
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The installation height of indoor unit must be 2.3m or more.
INDOOR UNIT
Names of Indoor Components
Insulation pipe for are section
Qty
No.
Item
Figure showing the Installation of Indoor Unit.
2
Opening on ceiling and suspension bolt
1
(Unit : mm)
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Need a connecting work for refrigerant pipe, drain pipe and F cable in the ceiling after
suspending the indoor unit. Arrange drain pipe, refrigerant pipe and F cable in their
installation position.
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For nishing of opening on ceiling, arrange with builder in detail.
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If ceiling is already completed, connecting cables between indoor and outdoor, piping and
drain piping must be done before tting indoor unit.
Wall Penetration and Installation of Protection Pipe
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Drill a ø 65mm hole on wall which is slightly tilted towards
the outdoor side. Drill the wall at a small angle.
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Cut the protection pipe according to the wall thickness.
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Empty gap in the sleeve of protection pipe should be
completely sealed with putty to avoid dripping of rain
water into the room.
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In case drain piping cannot be done smoothly due to obstacles, it can also be arranged
outside of the main unit as shown in the drawing below.
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CAUTION
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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.
Connecting the pipe to the indoor unit
Remove the are nut and seal cap.
By loosening the are nut at the pipe end, the refrigerant is discharged in a small amount.
The arrangement has been made for shipment, and the discharge of refrigerant is never a
trouble to the equipment.
When the are nut is removed, never fail to remove the seal cap. If not removed, the
refrigerant will not be circulated, which result the compressor drive motor will possibly be burnt.
Apply refrigerator oil to the union and the ared portion of the pipe.
Wrap are insulation, bind top and bottom are insulation by binder.
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.
!
CAUTION
Connecting of drain pipe
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Securely glue connection part of
drain hose and PVC pipe, using PVC
adhesive.
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If gluing of drain hose and PVC pipe
is too weak, water leakage may occur.
Be sure to wrap generally-available
insulator (10mm or more of foamed
polyethylene) around drain hose,
inside the house, for insulation heat.
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Checking drain and water leakage.
Perform after connecting power.
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If checking of drainage is omitted,
water drop may occur.
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Add water to water pan of indoor unit
as shown below.
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Perform test running of drain pump
to check drainage operation.
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Test run method
1
Turn power on.
2
Remove cover of electric box and
set the drain pump test run switch
to TEST.
3
After checking the drainage, return
the switch to NORMAL.
Connecting the pipe
4
INDOOR UNIT
FOR SERVICE PERSONNEL ONLY
Pattern paper for positioning
plate
Screw for holder of Remote
Controller
AAA Size Battery
Binder
Insulation pipe for drain pipe
Insulation pipe
Remote Controller
Pattern paper for installation
plate
Installation plate xing screw
(M5 X 16)
4
1
2
2
1
1
1
1
1
4
Blower cover
2
Preparation for installing indoor unit
2
Installation of suspension bolts
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Be sure to reinforce furring of ceiling (frame : ceiling joints and supporter) to maintain level
of ceiling and prevent vibration of ceiling plate.
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Suspension bolts should be purchased in the eld.
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Refer to diagrams shown below for length of suspension bolts.
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In case of wooden frame
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In case of steel frame
(Unit : mm)
Be sure to use protection pipe
(commercial product).
If connecting cables are touching
metal lath inside the wall or inside
the wall is hollow where mouse
can bite cables, it can cause
electrical shock or re.
If sealing is not complete, high
humid air from inside the wall or
outside of the room can come in
and cause water dripping.
!
WARNING
Drain pipe installation
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Use PVC pipe VP20 (O.D. 26mm) for drain pipe.
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Be sure to roll an insulation (thickness 10mm or more) for the drain pipe at indoor side.
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Always draw the drain pipe downward so that water ows smoothly. Fix it (ex. by hanger)
to prevent a peak and trap.
Installation of indoor unit
3
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CAUTION
Since 2-way outlet as shown below causes performance problems, do not set it.
Blower cover installation
Install the blower cover only to the air outlet direction which is not in use.
Install the blower cover at the diffuser position shown. Fix the blower cover certainly.
Corner seal installation
Install the corner seal at position shown. Fix the corner seal certainly. Shall be installed
disregard to 2 directions, 3 directions or 4 directions.
!
CAUTION
When connecting pipes, if are nut is over-tightened at the small diameter side, the screw
thread of the service valve may be broken making pipe connection impossible. Be sure to
tighten the nut with speci ed torque.
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If drain pump test run is right
set to TEST, drain pump may
malfunction.
!
CAUTION
The indoor piping
should be insulated
with the enclosed
insulation pipe. (If the
insulator is insuf cient,
please use commersial
products).
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The difference in height
between the indoor and
outdoor unit should be kept
below 10m.
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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).
Drain Pipe
Must be installed separately.
Insulate indoor part of pipe to
prevent condensation.
Be sure to
completely
seal any
gap with
putty.
Drawing of bottom view of ceiling
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Be sure to install the indoor unit level. If the indoor unit is
inclined, water may leak.
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If space between bottom surfaces of indoor unit and ceiling
is not correct, there may be a gap between the panel and
indoor unit, with consequence dropping of condensed water.
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CAUTION
Selecting the switch
1
Turn power off.
2
Remove cover of the electrical box.
3
When selecting discharge direction of 2 directions or 3 directions, select
the “AIR FLOW SELECTION” on the main PWB to 3 way.
When selecting discharge direction of 4 directions, select the “AIR FLOW
SELECTION” on the switch PWB to NORMAL.
NOTE:
During 2 directions or 3 directions, sound level will increase.
3
Corner Seal
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Be sure that bottom face
of indoor main unit is the
same height (or expected
height if the ceiling is new
construction.) as lower
surface of the ceiling.
Selecting the switch
1
Turn power off.
2
Remove cover of the electrical box.
3
When install the indoor unit 2500mm or
more from the oor, select the “STATIC
PRESSURE SW” on the main PWB to
HIGH PRESSURE.
When install the indoor unit below
than 2500mm from the oor, select the
“STATIC PRESSURE SW” on the main
PWB to NORMAL.
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If constructing the ceiling after installation
of air conditioner, be sure to attach a
pattern paper for installation that shows
ceiling opening dimension.
<
IA992: A
>
Holder for Remote Controller
RAI-25RPA
RAI-35RPA
RAI-50RPA
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CAUTION
•
The installation height of indoor
unit must be 2.3m or more.
1
2
3
4
5
6
7
8
11
12
13
14
16
Qty
No.
Item
1
Insulator
RAI-50RPA
17
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Set nut and washer on suspension bolt and hook it to suspension clamp by lifting the
indoor unit.
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Suspension bolt must have play of 20-30 mm on its right and left. If cannot have enough
play, x lifting lug to suspension bolt without attaching nut underneath the suspension bolt,
then attach nut and install indoor unit.
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Make sure that indoor unit is kept level using a level.
The space between bottom surfaces of ceiling and indoor unit
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Be sure to install the indoor units as follow position (1).
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Do not install the indoor units as follows position (2) (3).
(1) Same level (draw in 0~2mm)
(2) Stick out above 0mm (3) Draw in above 3mm
Selecting the Mounting Position
The installation place is very important for the air conditioner because it is very dif cult to
move from one place to another after the rst installation.
Decide the mounting position together with the customer.
The discharge direction can be selected as shown below.
INS RAI-25-35-50RPA (EN1) 1
3/11/13 3:03 PM
