• 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
• 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.
INDOOR UNIT / OUTDOOR UNIT
RAS-T18EX / RAC-T18EX
HITACHI SPLIT UNIT AIR CONDITIONER
INSTALLATION MANUAL
CAUTION
•
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.
Tools Needed For Installation Work
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
FlareTool
• Carefully read through the procedures of proper
installation before starting installation work.
• The sales agent should inform customers regarding
the correct operation of installation.
SAFETY PRECAUTION
No.
Item
Qty
Mounting Plate
1
Screw for Mounting
Plate
5
Holder for
Remote
Controller
1
AAA Size Battery
2
Screw for Holder of
Remote Controller
2
Pipe Support
1
Remote
Controller
1
Screw for Earth
(for indoor use)
(Not for 200V
model)
1
Nano-Titanium
Disinfecting/
Deodorizing/
Air Purifying Filter
1
Nano-Titanium
Disinfecting/
Deodorizing/
Dust Collecting
Fresh Air In Filter
1
Names Of Indoor Components
No.
Item
Qty
Insulation Sheet
for Hose
1
Anti-Insect
Net
1
Anti-Insect
Net Adapter
Hood
1
Elbow for
Right Piping
Reducing
Adaptor
1
1
1
Horizontally
Rear-Out Air Duct
(ø29 x 640)
Fresh Air In Exhaust
Hose (A)
(ø25 x 645)
Fresh Air In Exhaust
Hose (B)
(ø20 x 645)
1
1
1
The Length of Indoor
Unit Power Cord
• Do not alter the power cord.
Direction of Piping
Cut away shaded
por tion, and
finish the edge of
the opening so
that there is no
burr.
Horizontally
perpendicular
to the unit
Dimension of Mounting
Stand of the Outdoor Unit
(unit : mm)
Mounting stand
Be sure
to com-
p l e t e l y
seal any
gap with
putty.
THE CHOICE OF MOUNTING SITE
(Please note the following matters and ontain 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
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.
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 specified in figure below. At least two 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 connecting cord at least
1 m away from the antenna or signal line of television,
radio or telephone. This is to avoid noise interference.
INDOOR UNIT
about 1.6m
about
0.9m
n
Conditions when the fresh air in, exhaust should not be operated.
(Please install only with the customer’s
consent).
1
OUTDOOR UNIT
+ –
1
2
3
4
5
6
7
8
9
0
!
@
#
$
%
^
&
*
Fresh Air In Exhaust Hose Installation
• The fresh air In exhaust should not be operated under the following conditions:
(A) When the fresh air In exhaust hose cannot be vented directly outside the room (mounting work specified for the
embedded
ducting).
(B) When there is a source of a questionable odor, smoke, or oily smoke in the vicinity of the opening of the fresh air In
exhaust hose, even if the mounting work directly vents the fresh air In exhaust hose outside the room.
• The fresh air in should not be operated (only exhaust can be operated) under the following conditions:
(C) When there is space to vent the fresh air In exhaust hose between the internal and external walls, which leads outside
the room, even if the mounting work cannot directly vent the fresh air In exhaust hose outside the room (conventional
construction
methods).
• Please set the fresh air In exhaust Selection Switch according to the mounting configuration (refer to “Setting the Fresh Air
In Exhaust Selection Switch" on page 13).
In the case of (A) or (C) in the above, fresh air In exhaust can be operated if the fresh air In exhaust hose is vented outside
the room through a hole in the wall (refer to “End Treatment of the Fresh Air In Exhaust Hose” on page 14).
The Fresh Air In Exhaust function is included in this model. Please follow the “Exhaust hose”
installation instructions when mounting.
Dimension when Installing included Fittings
• ø 25 Fresh air in exhaust hose (A)
• ø 20 Fresh air in exhaust hose (B)
•
within
0.6m
within
0.6m
within
0.5m
backward
piping
horizontally
piping from right
fresh air in exhaust hose (A)
or
fresh air in exhaust hose (B)
vertically down
from right
Dimensions when installing the fitting for
ø25 and ø20 fresh air in exhaust hose.
within
0.6m
Use of Accessories
UNUSED ACCESSORY
Unused accessories may become necessary in case of transfer of air conditioner. Request your customer to keep all
the unused accessories together with this installation manual and instruction manual.
Part Name
Fresh air
in exhaust
hose (A)
Anti-insect
net
Anti-insect
net adapter
Rain hood
Elbow for
right piping
Elbow for
right piping
Elbow for
left piping
Elbow for left piping
Reducing adapter
Air duct for
rear horizontal
piping
Air duct for rear
horizontal piping
Fresh air
in exhaust
hose (B)
Remark
Backward
piping
use when
selecting ø20
fresh air in
exhaust hose
when fresh air
in exhaust
outlet cover
is not using.
use when connecting
ø25 and ø20 fresh
air in exhaust hose.
Select ( ) depending on the installation condition.
Vertically down
from right
Vertically
down from left
Vertically
down from left
Horizontally
piping from right
Horizontally
piping from left
When the existing
hole in the wall is
out of alignment
in case of directly
backward piping
When the existing hole in the
wall is out of alignment in case
of directly backward piping
Horizontally
piping from left
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
( )
fresh air in exhaust hose (A)
or
fresh air in exhaust hose (B)
fresh air in exhaust hose (A) or
fresh air in exhaust hose (B)
fresh air in exhaust hose (A) or
fresh air in exhaust hose (B)
For directly backward piping or horizontally rear-out piping when the
hole in the wall is of ø 70mm or more.
For directly backward piping or horizontally rear-out piping when the
hole in the wall is of ø 65mm or more.
When the fresh air in exhaust hose of ø 25 and ø 20 are connected with
a reducing adapter, the dimension range will be as shown in the figure on the right.
For the hole
in the wall of
70mm or more
For the hole
in the wall of
65mm or more
Horizontally
rear-out piping
horizontally
rear-out piping
Air duct for rear
horizontal piping
Elbow for
right piping
Distance from the
indoor unit to the
hole in the wall
Thickness
of the wall
above
230mm
+
+
Target
hose
length
Thickness
of the wall
above
230mm
Thickness
of the wall
above
230mm
=
+
+
+
2
Length Adjustment of the Fresh Air In Exhaust Hose
3
Connecting the Fresh Air in Exhaust Hose
Backward piping • Directly backward piping by using
the existing hole in the wall
Extend the fresh air in exhaust hose
Backward piping • Vertically down from right • Horizontally piping from right
Vertically down from right • Horizontally piping from right
Target
hose
length
Thickness
of the wall
Distance from the
indoor unit to the
hole in the wall
Distance from the
indoor unit to the
hole in the wall
above
230mm
=
+
+
+
Fresh air in
exhaust hose on
the rear of 180mm
Thickness
of the wall
above
230mm
+
+
Target
hose
length
Distance from the fresh air in
exhaust end connection to
the hole in the wall.
Distance from the fresh air in exhaust
end connection to the hole in the wall
Thickness
of the wall
above
230mm
=
+
+
Thickness
of the wall
above
230mm
Cut
Position
The side of fresh air in exhaust end
connection
Alignment line
Fresh air in
exhaust hose (B)
Reducing
adapter
Fresh air in
exhaust hose (A)
+
Target
hose
length
Thickness
of the wall
Distance from the
indoor unit to the
hole in the wall
above
230mm
=
+
+
Vertically down from left • Horizontally piping from left
This model is supplied with two hoses. When a hole of ø70mm or more can be made on the wall, use the fresh air in exhaust
hose (A) of ø25. If the hole size is smaller than that, use of the fresh air in exhaust hose (B) of ø20 is recommended with a view
to easy installation. (However, there is no problem in using the fresh air in exhaust hose of ø25 if it can go though the hole of
below ø70mm.)
Make sure to decide which hose, i.e., either air in exhaust hose of ø25 or of ø20, only after obtaining customer’s
consent.
Please ensure that the entire length of the two way air exchange hose is within 3m.
Fresh air in exhaust hose
on the rear of 85mm
Fresh air in exhaust hose
on the rear of 180mm
Fresh air in exhaust
hose on the rear of
85mm
Horizontally rear-out piping
The fresh air in exhaust hose can be extended up to 1.2m by connecting the supplied fresh air in exhaust hose (A) and fresh air in
exhaust hose (B) with the reducing adapter. When extending by connecting hoses of the same diameter, an additional optional
fresh air in exhaust hose is necessary.
When extending the hose, cut off the cuff on
the fresh air in exhaust hose to be connected
Cuff
Vinyl tape
Secure the fresh air in exhaust
hose to the reducing adapter by
wrapping vinyl tape around them
When desiring to extend the fresh air in exhaust hose more than 1.2m, an additional optional fresh air in exhaust hose needs to
be used. For connecting method, refer to the instructions supplied with the optional part.
Please shorten the length of the hose as much as possible to prevent the degradation of the fresh air in, exhaust operating
performance.
Cut the hose insulation which is to be wrapped around the elbow for right piping along the perforation. Cover the elbow with
the insulation and secure them with vinyl tape.
Cut the hose insulation along the perforation. Cut it off according to the hose length.
(Insulation length: 200mm for directly backward piping / 180mm for vertically down from right and horizontally piping from
right + distance from the indoor unit to the hole in the wall)
(1)
(2)
(3)
Hose insulation
Perforation
Connecting port side of the air duct for rear horizontal piping
Cutting dimension
Larger
dimension
Smaller
dimension
Elbow for right piping
Insulation for right piping elbow
Secure with
vinyl tape
Align the end face to the elbow line,
wrap and secure with vinyl tape
Securely connect the elbow for right piping, fresh air in exhaust hose (A) and fresh air in exhaust hose (B) to the air duct for
rear horizontal piping. Then, wrap the insulation which has been cut according to the above (2) around the fresh air in
exhaust hoses.
Cover the parts of the fresh air in exhaust hose which passes through the room with insulation sheet for hoses and wrap with
tape to ensure there are no spaces.
When horizontally piping is carried out for fresh air in exhaust hose, the split line of the hose insulation must come to the top.
Directly backward piping, vertically down from right and horizontally piping from right can be arranged by turning the fresh air in
exhaust hose by 90 degrees.
2,300mm or more
15
m
The difference in height
between the indoor and
outdoor unit should be
kept below 10m.
The connecting pipe,
no matter big or small,
should all be insulated
with insulation pipe and
then wrapped with
plastic tape.
deteriorate if it is not
wrapped with tape).
The connection of
insulated drain hose.
Please use insulated
drain hose for the indoor
piping (commercial
550
187
12
355
20
(The insulator will
product).
Figure showing the Installation of Indoor and Outdoor Unit.
CAUTION
In case the pipe length is more than 8m, add refrigerant R22 at 10
gram per every meter exceeds. However, pipe length shall not
exceed 15m.
20
~
~ *
are accesories provided
for fresh air in exhaust work.
•
T h e r e a r e 4 d i r e c t i o n s
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.
< IA236 :
A
>