Hitachi RAS-18EX9G, RAC-18EX9G Installation Manual

• Carefully read through the procedures of proper

Be sure to completely seal any gap with putty.

installation before starting installation work.

• The sales agent should inform customers regarding the correct operation of installation.

HITACHI SPLIT UNIT AIR CONDITIONER

INSTALLATION MANUAL

INDOOR UNIT / OUTDOOR UNIT

RAS-18EX9G / RAC-18EX9G

Tools Needed For Installation Work



Screwdriver  Measuring Tape  Knife Saw

+ –

ø 65mm Power

(14, 17, 19, 22mm)

Cutter

 Drill Allen Key ( 4mm)  Wrench

 Gas Leakage Detector  Pipe

 Plastic Tape  Pliers  FlareTool

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

• 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.

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.

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.

• 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,

INDOOR UNIT

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.

Names Of Indoor Components

No. Item Qty

Mounting Plate

Screw for Mounting

Plate

Holder for Remote

Controller

AAA Size Battery

Screw for Holder of Remote Controller

Pipe Support

Remote Controller

Screw for Earth (for indoor use)

(Not for 200V model)

Nano-Titanium Disinfecting/ Deodorizing/

Air Purifying Filter

Nano-Titanium Disinfecting/ Deodorizing/ Dust Collecting

Fresh Air In Filter

No. Item Qty

Insulation Sheet

for Hose

Anti-Insect

Net

Anti-Insect

Net Adapter

Hood

Elbow for

Right Piping

Reducing

Adaptor

Horizontally Rear-Out Air Duct

29 x 640)

(

Fresh Air In Exhaust Hose (A)

25 x 645)

(

Fresh Air In Exhaust Hose (B)

20 x 645)

(

•

~* are accesories provided

for fresh air in exhaust work.

Figure showing the Installation of Indoor and Outdoor Unit.

In case the pipe length is more than 8m, add refrigerant R22 at 20 gram per every meter exceeds. However, pipe length shall not exceed 15m.

The Length of Indoor

about

0.9m

• Do not alter the power cord.

Direction of Piping

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.

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

• 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

OUTDOOR UNIT

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.

CAUTION

Unit Power Cord

about 1.6m

Horizontally perpendicular to the unit

Dimension of Mounting

Stand of the Outdoor Unit

(unit : mm)

Mounting stand

WARNING

CAUTION

355

550

187

2,300mm or more

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.

(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).

Fresh Air In Exhaust Hose Installation

The Fresh Air In Exhaust function is included in this model. Please follow the “Exhaust hose” installation instructions when mounting.

Conditions when the fresh air in, exhaust should not be operated. (Please install only with the customer’s consent).

• 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).

Dimension when Installing included Fittings

• ø 25 Fresh air in exhaust hose (A) For directly backward piping or horizontally rear-out piping when the hole in the wall is of ø 70mm or more.

• ø 20 Fresh air in exhaust hose (B) 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.

within

0.6m

Dimensions when installing the fitting for

ø25 and ø20 fresh air in exhaust hose.

within

0.6m

within

0.5m

within

0.6m

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.

Use of Accessories

Part Name

Remark

Backward piping

Vertically down from right Horizontally piping from right

Horizontally rear-out piping

Vertically down from left Horizontally piping from left

When the existing hole in the wall is out of alignment in case of directly backward piping

Backward

Horizontally

piping from right

Vertically down

piping

Fresh air in exhaust hose (A)

Fresh air in exhaust hose (B)

Air duct for rear horizontal piping

Select ( ) depending on the installation condition.

Elbow for right piping

Anti-insect net adapter

use when selecting ø20 fresh air in exhaust hose

( )

Hood

when fresh air in exhaust outlet cover is not using.

Horizontally

rear-out piping

Fresh air in exhaust hose (A)

Fresh air in exhaust hose (B)

Anti-insect net

from right

Elbow for right piping

Reducing adapter

use when connecting ø25 and ø20 fresh air in exhaust hose.

( )

Vertically

down from left

Elbow for left piping

Fresh air in exhaust hose (A) or Fresh air in exhaust hose (B)

Air duct for rear horizontal piping

Horizontally

piping from left

Fresh air in exhaust hose (A)

For the hole in the wall of 70mm or more

( )

When the existing hole in the wall is out of alignment in case of directly backward piping

Air duct for rear horizontal piping

Fresh air in exhaust hose (A) or

Fresh air in exhaust hose (B)

For the hole in the wall of 65mm or more

( )

Elbow for right piping

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.

Length Adjustment of the Fresh Air In Exhaust Hose

Backward piping • Directly backward piping by using the existing hole in the wall

Target

Fresh air in exhaust

=++

hose

hose on the rear of

length

85mm

Thickness of the wall

Fresh air in exhaust hose on the rear of 85mm

Thickness

above

of the wall

230mm

above 230mm

Horizontally rear-out piping

Target

Distance from the fresh air in

hose

exhaust end connection to

length

the hole in the wall.

Extend the fresh air in exhaust hose

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

Distance from the fresh air in exhaust end connection to the hole in the wall

Thickness of the wall

Thickness

of the wall

above

230mm

above 230mm

Vertically down from right • Horizontally piping from right

Thickness of the wall

Distance from the indoor unit to the hole in the wall

Fresh air in exhaust hose on the rear of 180mm

above

230mm

Thickness of the wall

above 230mm

Target

Fresh air in

=+ ++

hose

exhaust hose on

length

the rear of 180mm

Distance from the indoor unit to the hole in the wall

Vertically down from left • Horizontally piping from left

Target

Distance from the

hose

indoor unit to the

=++

length

hole in the wall

Thickness of the wall

Distance from the indoor unit to the hole in the wall

above 230mm

Thickness of the wall

above 230mm

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

Cut

Position

Fresh air in exhaust hose (B)

Reducing adapter

Fresh air in exhaust hose (A)

Secure the fresh air in exhaust hose to the reducing adapter by wrapping vinyl tape around them

Vinyl tape

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.

Connecting the Fresh Air in Exhaust Hose

Backward piping • Vertically down from right • Horizontally piping from right

Cut the hose insulation which is to be wrapped around the elbow for right piping along the perforation. Cover the elbow with

(1)

the insulation and secure them with vinyl tape.

(2)

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)

Hose insulation

Cutting dimension

Insulation for right piping elbow

(3)

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

Perforation

Larger dimension

Smaller dimension

Connecting port side of the air duct for rear horizontal piping

Alignment line

The side of fresh air in exhaust end connection

Elbow for right piping

Align the end face to the elbow line, wrap and secure with vinyl tape

Secure with vinyl tape

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.

< IA233 : B >

CAUTION

• The draining hose in this indoor unit can be installed on the left or right. Indoor unit must be fixed horizontally or

slightly tilted towards the side of drain hose. Otherwise, condensed water may overflow the water container.

Ensure that the fresh air in exhaust hose which passes through the elbow the room is

•

CAUTION

covered with insulation sheet for hoses.

Dew may form on the elbow and fresh air in exhaust hose and there may be a possibility of water droplets forming.

Air duct for rear horizontal piping

Make sure to bring the square hole to the bottom side

Securely connect the fresh air in exhaust hose to the fresh air in exhaust

(4)

connecting port. The hole for rear horizontal piping should come to the

Elbow for right piping

Fresh air in exhaust hose (A) or Fresh air in exhaust hose (B)

bottom side after the connection.

Square hole

Fresh air in exhaust end connection Wrap the insulation for rear horizontal piping without space between insulation and hose, and then secure them with tape (locally procured)

Fresh air in exhaust end connection

Horizontally rear-out piping

(1)

Cut off 100mm of the hose insulation to be wrapped around the fresh air in exhaust hose. Cover the fresh air in exhaust hose (A) or (B) with the insulation, and secure them with vinyl tape.

Hose insulation

Securely connect the fresh air in exhaust hose to

(2)

the fresh air in exhaust connecting port.

Fresh air in exhaust hose (A) or Fresh air in exhaust hose (B)

Vertically down from left • Horizontally piping from left

Cut the hose insulation which is to be wrapped around the left piping elbow along the

(1)

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.

(2)

(Insulation length: Securely connect the fresh air in exhaust hose (A) or (B) to the left piping elbow. Then, wrap

(3)

the insulation which has been cut according to the above (2) around the fresh air in exhaust

Distance from the indoor unit to the hole in the wall.)

hoses. Cover the fresh air in exhaust hose which runs indoor side with hose insulation and

Hose insulation

Insulation for left piping elbow

Perforation

wrap the tape without any space. When horizontally piping is carried out for fresh air in exhaust hose, the split line of the hose insulation should come to the top.

Elbow for left piping “LEFT” is indicated on the opposite side of arrow

Smaller dimension

(4)

Securely connect the fresh air in exhaust hose to the fresh

Larger dimension

Align the end face to the elbow line, wrap and secure with vinyl tape.

Elbow for left piping

Fresh air in exhaust hose (A) or Fresh air in exhaust hose (B)

air in exhaust connecting port. (Vertically down from left and horizontally piping from left can be arranged by turning the elbow for left piping by 90 degrees.)

When the Existing Hole in the Wall is Out of Alignment In Case of Directly Backward Piping

(1)

Obtain dimension D by measuring the dimension of the existing hole in the wall. Remove the adapter at the tip of the air duct for rear

(2)

horizontal piping. Cut short the air duct for a length of dimension D. For insulation, cut it off into a length shorter than the air duct main body by 23mm. Attach the adapter to the tip of the air duct.

(3)

Cut the hose insulation which is to be wrapped around the

(4)

elbow for right piping along the perforation. Cover the elbow with the insulation and secure them with vinyl tape. Cut off 200mm of the hose insulation and wrap the cut

(5)

insulation around the fresh air in exhaust hose.

2 piping directions of vertically down from left and horizontally piping from left are available by turning the elbow for left piping by 90 degrees.

Existing hole

Indoor Unit

Proper hole

For the subsequent procedures, refer to “Directly backward piping", "Vertically down from right", "Horizontally piping from right”.

Fresh air in exhaust hose (A) or Fresh air in exhaust hose (B)

Air duct main body

Adapter

Air duct for rear horizontal piping

Insulation

Installation Of Mounting Plate, Wall Penetration And Protection Pipe

Direct mounting on the wall

•

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

When it is difficult to look for a stud, use an

•

item such as board anchor (sold on the open market).

Board anchor

Level

Beam

Mounting Plate

Stamp

Line

Weight Pipe hole

Drill hole for board anchor

•

While placing the mounting plate on the wall, embed the board anchor in the wall. Slide down the mounting plate and then fix

• the mounting plate with the board anchor.

Visible outline of the indoor unit

INDOOR UNIT

Drain hose

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.

Wall

Indoor

Putty

Protection Pipe

Outdoor

Putty

Sleeve of Protection Pipe

When mounting using crown molding and head jamb

•

Temporarily assemble the mounting plate and the vertical rail according to the dimension H between the crown molding and head jamb.

•

Using the crown molding and head jamb, temporarily attach the top and the bottom of the vertical rail. Clamp the mounting plate after making sure that it is level.

•

Vertical rail (optional)

Screw for mounting plate

Screw the mounting

(Screws in the illustration below are supplied with the vertical rail.)

Vertical rail is an optional accessory

(Model : SP-BT-2)

plate at the positions possibly near the upper and lower hooks where the indoor unit is hung. Use 4 or more screws to fix the mounting plater.

Better finishing with small gap between the unit and the head jamb can be obtained by aligning the mark “Vertical Rail 0 Position” on the mounting plate to the scale “0” on the vertical rail.

Mark on the mounting plate “Vertical Rail 0 Position”

•

Position of the hole to be made in the wall can

Head jamb

Indoor unit

be decided by attaching the lower cover to the mounting plate.

For right wall hole

Center of the wall hole

When the hole in the wall is ø80mm, align the  mark on

the lower side of the lower cover to the  mark on the

Center of the wall hole

For right wall hole

Center of the wall hole

Wall hole

mounting plate. When the hole in the wall is ø65mm, align the  mark on the upper side of the lower cover to the  mark on the mounting plate.

CAUTION

•

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.

For right wall hole

When installing between 0.90m pillars

Vertical rail (optional)

Wall

Indoor Unit

For the place where the pillar is projected from the wall surface, use the optional vertical rail

•

Pillar

for mounting between 0.90m pillars (model: SP-BT-3) or horizontal rail (model: SP-BY-1).

When installing using the existing hole in the wall

Existing hole in the wall

Indoor Unit

Auxiliary refrigerating pipe of the indoor unit

Installation Of The Indoor Unit

When installing the unit using the existing hole in the wall but the indoor unit cannot be

•

moved due to a hole on the left side, form the auxiliary refrigerating pipe of the indoor unit as shown in the illustration.

•

Form the pipe carefully to avoid crushing of the pipe.

•

For connection of the fresh air in exhaust hose, refer to “When the Existing Hole in the Wall is Out of Alignment In Case of Directly Backward Piping” on page 5.

1. Preparation of Installation

Remove the Front Panel

• To remove front panel, please refer to page 15 “Removing and Attaching the Front Panel”.

• Make sure to use both hands to attach and remove the front panel.

Remove the Top Grill

• To remove top grill, please refer to page 15 “Removing and Attaching the Top Grill”.

Remove the Lower Cover

• Pull at the 2 and 1 in the directions as shown by arrows to remove the lower cover.

• To attach the lower cover, attach 1

Removing

first and then attach 2 by rotating it around the 1 as the fulcrum.

Wiring Connection

••Refer to page 12.

Cutting Lower Cover Bush

(Horizontal Downward Piping)

While installing the pipe from the right, left or bottom side,

• use a knife to cut openings as shown in figure. Then

Attaching

smoothen the edges of openings with a file. Use the groove on

• the outer side when installing the fresh air in exhaust hose, and use the groove on the inner side when not installing.

Groove on the outer side

Groove on the inner side

Bush

Changed of Drain Hose and Installation Procedures

(Horizontal Piping)

•

Exchange the location of drain hose and drain cap while installing the pipe from the left side as shown on top right. Remove the lower cover.

•

Do not carry out horizontal piping for drain hose.

< IA233 : B >

B Dimensions = (807-A) mm

Drain cap

Drain hose

Move the drain hose insulation to take out the drain hose.

Insert drain cap up to the location securely till the cap stops.

insulation sheet

Drain cap

CAUTION

Be sure to insert drain hose and drain cap firmly. Insufficient insert may result in water leakage.

It's easier to use pliers to pull out the drain cap.

Drain hose insertion cuff mark

Drain hose insulation sheet

The rib at the indoor unit side

Drain hose

Securely push in the drain hose until the drain hose cuff mark comes in contact with the rib at the indoor unit side.

After inserting the drain hose, insert the drain hose insulation sheet to the location securely.

Preparation of Refrigerating Pipe and Fresh Air In Exhaust Hose

Backward piping

Remove the auxiliary insulation material sheet which is attached to the pipe insulation. (Keep the removed auxiliary insulation material sheet because it will be reused after pipe connection.) Referring to the mark on the rear side, form the pipe within the wall hole range.

Place the starting point of refrigerating pipe bending within the wall hole range.

Please bend at a small radius to form an arc.

Pipe support

Finishing of pipe bending must be within this range.

Auxiliary insulation sheet

If the starting point of refrigerating pipe bending is projected from the wall hole range or if the bending radius is too large, the

Wall hole

indoor unit may be lifted

range

from wall and this may cause poor finishing.

(Mark detail)

Pipe support

Drain hole

Layout for the hole in the wall of directly backward piping

Center line of wall hole

Fresh air in exhaust hose

65 in case of

Auxiliary pipe

wall hole range

Bending of the refrigerating pipe must be within the wall hole range.

Connect the fresh air in exhaust hose. (Refer to page 3 "Fresh Air In Exhaust Hose Installation"). Referring to the mark at the back, join the refrigerating pipe, drain hose, fresh air in exhaust hose and connecting cord, and then fix them temporarily with tape.

Mark detail

Layout for the hole in the

Pipe support

wall of ø65 in case of directly backward piping

Drain

hose

Center line of wall hole

Auxiliary pipe

hole range Bending of the refrigerating pipe must be within the wall hole range.

Fresh air in exhaust hose

Pipe support

Join the refrigerating pipe, drain hose, two way air exchange hose and connecting cord, and then fix them temporarily with tape.

Refrigerating

Connecting

pipe

cord

Drain hose

Please follow the same

layout as the mark.

Wrap the through-hole portion with tape.

Wrap with tape

Horizontally and Downward Piping from right

Remove the auxiliary insulation material sheet which is attached to the pipe insulation. (Keep the removed auxiliary insulation material sheet because it will be reused after pipe connection.)

Carry out refrigerating pipe forming.

In case of horizontally piping from right, the fresh air in exhaust hose runs below the pipe. Bend the pipe so that it comes to the upper end of the bottom cover bush hole, as shown in the illustration on the right.

Bottom cover

bush hole

Drain hose

Layout of horizontally

piping from right

Refrigerating

pipe

Fresh air in

exhaust hose

Transform the

•

piping while holding

CAUTION

Installation after connection of refrigerating pipes

(Horizontally piping)

down the lower portion of pipe-support by hand.

Pipe

support

Transform

after bending

downward.

Remove the auxiliary insulation material sheet which is attached to the pipe insulation. Cut the heat insulation sheet refrigerating pipe aligning to the insulation sheet of the pipe and fix them temporarily with tape. Cover the pipe connection with the auxiliary insulation sheet, which has been removed on earlier stage, with its split line on the top. Wrap the tape without any space.

Connect the refrigerating pipe.

Tape must not be

over tightened.

Auxiliary insulation sheet

Refrigerating pipe

insulation sheet

Cut

Refrigerating

pipe

Refrigerating pipe

insulation sheet

Refrigerating

Fix temporarily

with tape

Form the refrigerating pipe according to the wall hole position. Especially in case of horizontally backward piping, follow the instruction below to carry out accurate forming.

(1)

Referring to the mark at the back, start bending the refrigerating piping within wall hole range.

Bend it with the smallest radius.

wall

When forming, bend the refrigerating pipe with the

(2)

smallest radius as the layout of the mark.

Place the starting point of refrigerating pipe bending the wall hole range.

< Mark detail >

Layout for the hole in the wall of ø65 in case of horizontally backward piping

wallwall

Center line

hole rangehole range

of wall hole

Fresh air in

exhaust hose

Refrigerating pipe

Drain hoseDrain hose

Refrigerating

pipe

Bend the refrigerating pipe to follow the same layout as the mark.

Connect the fresh air in exhaust hose. (Refer to page 3 "Fresh Air In Exhaust Hose Installation"). Form the connecting cord and refrigerating pipe and put them in the space on the lower side of the rear

urface of the indoor unit. Fix them with the pipe

s support. Join refrigerating pipe, fresh air in exhaust hose, connecting cord and drain hose temporarily with tape and wrap the through-hole portion with tape.

Pipe support can be installed to whichever side of the installation points. However, it is recommended to attach it on the right side viewing from the rear.

Connecting the Refrigerating Pipe at the Back of the Indoor Unit

•

Form and set the refrigerating pipe and the connecting cord.

Please bend at a small radious to form an arc.

pipe

(Pipe can be bent with a small radius without being crushed if polyester core is used.)

Pipe support

The end of the refrigerating pipes are at locations marked with “ ” symbol.

Insert polyester core (commercial product) into the pipe.

•

When using a polyester core, make sure to insert it only after

CAUTION

flaring is carried out to avoid cutting dust from getting inside.

If the starting point of refrigerating pipe bending is projected from the wall hole range or if the bending radius is too large, the indoor unit may be lifted from wall and this may cause poor finishing.

Pipe support

Fresh air in exhaust hose

Wrap with tape

below 5 mm

Installation

Connecting the Refrigerating Pipe other than at the back of the Indoor Unit

Insert the pipe through the wall hole. The upper part of the Indoor unit is hung on the hanger. The projection at the lower part of the Indoor unit is hooked onto the hanger. After the refrigerating pipe is connected,

connection with the auxiliary insulation sheet, which has been removed on earlier stage, with its split line on the top. Wrap the tape without any space.

Mounting Plate

Protection

Pipe

Refrigerating Pipe

Drain

hose

Fresh air in

exhaust hose

F connecting

cord

cover the pipe

Mounting Plate

Projection of the indoor unit

Connecting the Refrigerating Pipe at the back of the Indoor Unit

Remove the auxiliary insulation material sheet which is attached to the pipe insulation. (Keep the removed auxiliary insulation material sheet because it will be reused after pipe connection.)

Carry out refrigerating pipe forming. Connect fresh air in exhaust hose. Hang the indoor unit on the mounting plate. Place the temporary stand under the right rear surface of the indoor unit to lift the lower side of the unit by approximately 15cm. Connect the refrigerating pipe. (Refer to “Pipe Connection” on Page 10) Wrap the pipe connection with tape so that there is no gap between heat insulation sheet. Insert the drain hose and fresh air in exhaust hose into the wall hole. Especially in case of horizontally backward piping, insert the hose following the explanation below. Connect the connecting cord. (Refer to “Connection of Power Cord” on Page 12) Form connecting cord and refrigerating pipe and put them in the space on the lower side of the rear surface of the indoor unit. Fix them with the pipe support. Remove the temporary stand under the indoor unit and fit the lower part of the indoor unit in the fixing tab on the mounting plate.

Fresh air in exhaust hose

Protection pipe

Drain hose

Pull this to the front during the connection of refrigerating pipe to ease task.

CAUTION

Do not over tighten vinyl tape on pipe heat insulation sheet. Do not over tighten to avoid loss of heat insulating effect and dew condensation. Pull the lower part of the indoor unit towards you and confirm that the tab of the indoor unit is fit in the installation plate. If the tab is not fitted in securely, vibration of the indoor unit becomes larger.

F connecting cord Pipe support Pipe support can be installed to whichever side of the installation points. However, it is recommended to attach it on the left side viewing from the front of the indoor unit.

Projection of the indoor unit

F connecting cord

Heat insulation pipe

Connecting part

Fixing tab

Temporary stand

Approx. 15mm

Heat insulation pipe

Refrigerating pipe

Tape

How to Remove Indoor Unit

Remove the left and right lower cover. (Refer to page 7 on how to remove the lower cover) Push the [PUSH] sections at the bottom of the indoor unit from the outside, the claws are released from the mounting plate. (2 places on the left and right) If the bottom of the indoor unit cannot be pushed due to the member such as horizontal rail above the head jamb, remove the front cover and insert a screwdriver into the hole for removal of indoor unit. Then, push the claws upwards while holding down the upper part of the hole and pull the indoor unit towards you. When horizontal piping is used, be careful not to damage the pipe and F cable with the tip of the screwdriver during this operation. Please refer to page 16 on how to remove the front cover. If the pipe support is installed on the left side viewing from the front of the indoor unit, remove the lower side of the pipe support.

Hole for removal

Hold with a hand

Hole for removal

Screwdriver

Claw

Mounting plate

• 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

OUTDOOR UNIT

different types of pipe available.

• Open the side plate by unscrewing the screws as shown on the right side.

1 Preparation of Pipe

• Use a pipe cutter to cut the copper pipe.

3 Drainage Check

After the indoor unit is installed, Please ensure the smooth flow of condensed water of the Indoor unit during installation. (Careless work may result in water leakage.)

•

During drainage work, install the drain pipe to ensure smooth drainage. Make sure to carry out drainage check.

(Careless work may result in water

)

leakage.

Make sure that there is no problem as

•

shown below.

Such problems may cause clogged drain

CAUTION

and could result in water leakage.

Drain hose must be at a slope of at

•

least 1/25. When inserting the drain hose into the

•

drain pipe for embedded piping, etc., do not cut the drain hose in the middle.

This may lead to poorer heat insulating performance of the drain hose and could result in water leakage.

Condensed water pond

Bending upwards

Condensed water pond

Be sure that the drain hose is not loosely connected.

Ditch

When the ventilating fan is used in an airtight house, a gurgling sound may be heard from around the drain pipe. In such a case, use the drain tank (service part RAS-2810KX 500).

• Before flaring, please put on the flare nut.

Please use exclusive tool.

•

Die

2 Pipe Connection

• In case of removing flare nut of an indoor unit, first remove a nut of small diameter side, or a seal cap of big

• Please be careful when bending the copper pipe.

• Screw in manually while adjusting the centre. After that, use a torque wrench to tighten the connection.

INSTALLATION OF REFRIGERATING PIPES

Wrench

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

Please make sure to remove all spacers inside the unit.

• Open the Top, Back and Side cover of the unit.

• Pull out the spacers inside. (Spacers are only for transportation purpose.) If not remove, vibration and noise will occur.

CAUTION

•

Jagged edge will cause leakage.

•

Point the side to be trimmed downwards during trimming to prevent copper chips from entering the pipe.

Imperial Flaring Tool

0.8 - 1.5 mm

1.0 - 2.0 mm

Copper pipe

Die

Trimming tool

Copper pipe

Outer

Diameter (mm)

6.35

15.88

CAUTION

diameter side will fly out. Prevent water from entering into the piping when working.

Flare nut

Torque

Small diameter side

Large diameter side

Valve head

cap

Small diameter side

Large diameter side

Valve core cap

Outer diameter

of pipe

6.35

9.52

6.35

9.52

Top cover

Back cover

Side cover

CAUTION

A (mm)

Rigid Flaring Tool

0 - 0.5 mm

0 - 1.0 mm

Torque N • m

(kgf • cm)

13.7 – 18.6 (140 – 190)

49 – 58.5 (500 – 600)

19.0 – 21.0 (194 – 214)

29.0 – 31.0 (295 – 318)

9.0 (92)

1 Remove of Air from the Pipe and Gas Leakage Inspection

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 manifold valve.

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.

Completely unscrew the spindle of the service valve (at 2 places) in anti-clockwise direction to

allow the flow of coolant (using Hexagonal Wrench key).

Remove the Charge hose and tighten the cap of

valve head. The task is then completed.

AIR REMOVAL

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.

When the meter reaches –101KPa (–76cmHg) during pumping, fully tighten the shuttle.

Meter showing pressure

Manifold valve

Vacuum pump

Charge hose

When pumping starts, slightly loosen the flare nut to check of air sucked in. Then tighten the flare nut.

The body of service valve

Cap of

valve core Hexagonal Wrench Key

Cap of valve head

Procedures of Wiring

In case the power is supplied from indoor unit.

Line Cord

WARNING

Indoor Unit

L N

BA BA

Connecting Cord

Outdoor Unit

ø2.0

The naked part of the wire core should be 10mm and fix 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. 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 an AC voltage of 220-240V 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. Do not make any conection in the middle of the connecting cable. It may cause the wire overheating, emit smoke and fire.

Wiring of the Indoor Unit

For wire connection of the indoor unit, you need to remove front panel and electrical cover.

Method to remove electrical cover

Remove the screw and electrical cover. Insert the connecting cord (A, B) from the bottom of unit. Fix the wire to terminal wires firmly as

Screw Electrical cover

shown in figure at right side.

Wiring of the Outdoor Unit

•

Please remove the side cover for wire connection.

CONNECTION OF POWER CORD

WARNING

• If you cannot attach the side cover due to the connecting cord, press the conencting cord in direction to the front panel to fix it.

• Be sure that the hooks of the side cover is fixed 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.)

WARNING

Indoor

Unit

THIS APPLIANCE MUST BE EARTHED.

Power line

30mm

15mm

Outdoor

Unit

10mm

GRN + YEL

Connecting cord for outdoor thermistor need to fix with indoor power cord by using binder. Purpose is to avoid this connecting cord from pulled out when pulling is given.

25mm

35mm

Strip wires

Method to remove the front panel

Refer to "Removing and Attaching the Front Panel" on page 15.

Connect the earth cord

After removing the screw and band, put the connecting cord and fix the band with screw.

Earth terminal

< IA233 : B >

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 proper wiring capacity, 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.

IMPORTANT

Cable length

up to 15m up to 25m

Wire cross-section

2.5mm

4.0mm

•

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 condition sare poor, use of a voltage regulation is recommended.

IMPORTANT

Fuse Capacity

20A time delay fuse

+ 5 hidden pages

Hitachi RAS-18EX9G, RAC-18EX9G Installation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual