Hitachi Air Conditioner Indoor Unit Installation Manual

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 signs.

• ⚠️ WARNING: Incorrect methods of installation may cause death or serious injury.
• ? CAUTION: Improper installation may result in serious consequence.
• ? This sign in the figures indicates prohibition.

General Warnings and Cautions:

• Make sure to connect the earth line.
• Be sure that the unit operates in proper condition after installation.
• Explain to the customer the proper operation and maintenance of the unit as described in the user's guide. Ask the customer to keep this installation manual together with the instruction manual.
• ⚠️ 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 installation 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 cables which are approved official in your country. Be sure to use the specified circuit. A short circuit and fire may occur due to the use of low quality wire or improper work.
• Be sure to use the specified cables 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 to prevent external force from being applied to the connection section of the terminal base. Improper insertion and loose contact may cause over-heating and fire.
• Please use the specified components for installation work. Otherwise, the unit may collapse or water leakage, electric shock, fire or stronger vibration may occur.
• Be sure to use the specified piping set for R410A,R32. Otherwise, this may result in broken copper pipes or faults.
• When installing or transferring an air conditioner to another location, make sure that air other than the specified refrigerant (R410A,R32) does not enter the refrigeration cycle. If other air should enter, the pressure level of the refrigeration cycle may increase abnormally which could result in a rupture and injury.
• Be sure to ventilate fully if a refrigerant gas leak while at work. If the refrigerant gas comes into contact with fire, 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 fire in the fan-driven heater, space heater, etc., a poisonous gas may occur.
• Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs please call a qualified air conditioner technician or electrician. Improper repairs may result in water leakage, electric shock and fire, etc.
• Be sure to connect the earth line from the power supply wire to the outdoor unit and between the outdoor and indoor unit. Do not connect the earth line to the gas tube, water pipe, lighting rod or the earth line of the telephone unit. Improper earthing may cause electric shocks.
• When finishing the refrigerant collection (pumping down), stop the compressor and then remove the coolant pipe. If you remove the refrigerant pipe while the compressor is operating and the service valve is released, air is sucked and a pressure in the freezing cycle system will build up steeply, causing an explosion or injury.
• When installing the unit, be sure to install the refrigerant pipe before starting the compressor. If the refrigerant pipe is not installed and the compressor is operated with the service valve released, air is sucked and the pressure level of the refrigeration cycle may increase abnormally which could result in a rupture and injury.
• The electric cables should neither be reworked nor added. Make sure to use an exclusive circuit breaker. Otherwise fire or electric shock might occur by connection failure, isolation failure or over current.
• Make sure to connect cables to terminal properly and terminal cover should close firmly. Otherwise, over heating at terminal contact, fire or electric shock might occur.
• Make sure that there is no dust on any connected points of electric cables and fix firmly. Otherwise, fire or electric shock might occur.

General Cautions:

• A circuit breaker must be installed in the house distribution box for the direct connected power supply cables to the outdoor unit. In case of other installations a main switch with a contact gap of more than 3mm has to be installed. 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. Improper installing may wet your furniture.
• An IEC approved power cord should be used. Power cord type: NYM.

Tools Needed For Installation Work

(Mark [⭐] is exclusive use tool for R410A,R32)

• Screwdriver
• Measuring Tape
• Knife
• Saw
• Drill
• Hexagonal Wrench Key (4mm)
• Wrench (14,17,22, 26, 27mm)
• Gas leakage Detector
• Pipe Cutter
• Putty
• Vinyl Tape
• Pliers
• Flare Tool [⭐]
• Vacuum Pump Adapter Hose
• Vacuum Pump
• Manifold Valve Charge
• [Power Drill Bit] 65mm

THE CHOICE OF MOUNTING SITE

(Please note the following matters and obtain permission from customer before installation.)

Mounting Site Requirements:

• ⚠️ WARNING: The unit should be mounted at a 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 specified in the 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 and television.
• 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.

Names of Indoor Components

Installation Steps

1. Installation of wall penetration and installation of protection pipe

1.1 Hole position

Make a [hole] on the [wall] such the position as shown below, in order to keep the flow for condensed water smooth.

Diagram Description: Illustration showing hole positioning for wall penetration. It indicates dimensions: 80-100mm from the wall edge, 65mm height from the bottom, and 55mm height from the top. It also shows that the [drain hose] should be positioned lower than the center of the [hole]. Two cases are depicted: making a hole on the [wall] and making a hole on the [floor].

1.2 Wall penetration and installation of protection pipe

• Drill a 65mm [hole] on the [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].

Diagram Description: Shows a cross-section of a [wall] with a [protection pipe] inserted. It illustrates sealing the gaps on both the indoor and outdoor sides with [putty]. A dimension of 2-5mm is indicated for the gap. A warning symbol highlights the need to prevent the wire from contacting metal in the [wall] and to use the [protection pipe] to prevent damage by mice.

2. Installation of the indoor unit

2.1 How to remove the front cover

Please refer to the section "Removal and installation of front cover" for details.

Diagram Description: Shows the indoor unit with screws (3 pieces) indicated for removing the front cover. It also shows screws (2 pieces) for the cabinet.

Considerations for Baseboard and Sideways/Floor Piping:

• If there is a [baseboard]: If the [baseboard] is 5-15mm in thickness and 115mm or less in height, cut the [pipe bushing] to conform to the [baseboard].
• For sideways piping: For right sideways piping, cut the stand's [bushing] with a plastic cutter or similar tool and use a file for an attractive finish.
• For floor piping: For floor piping, cut the front cover [bushing] with a plastic cutter or similar tool and use a file for an attractive finish.

Diagram Description: Illustrates modifications for baseboard installation, showing dimensions (5-15mm thickness, <=115mm height). It also shows cutting the stand's [bushing] for sideways piping and the front cover [bushing] for floor piping, indicating an attractive finish.

2.2 Drain pipe

Make sure the [drain pipe] slopes downward so that drain flows smoothly without being trapped in the middle. The [drain hose] (connecting port outer diameter: 16mm or 20mm, length: 500mm) is included in the indoor unit. Prepare a [drain pipe] as shown in the following figure. To prevent condensation, the indoor [drain pipe] should be covered with heat insulation material with a thickness of more than 10mm. After piping is completed, check to make sure that drain discharges smoothly. Seal the [drain pipe] tightly with tape to keep dirt out.

Diagram Description: Shows front and right side views of the drain pipe setup. It emphasizes the downward slope of the [drain hose] and [drain pipe]. Dimensions are provided: 500mm for the [drain hose], and wall clearance of 180mm or less, with specific measurements for the pipe connection area (100mm, 40mm, 210mm, 160mm, 120mm). It also shows a wall height of 180mm or less.

2.3 Connecting the pipe to indoor unit

Draw in the pipes through the [hole] of the [wall] or the [floor] to the indoor unit. Arrange the pipes as shown below. In the case that large pipe and small pipe are arranged, place them in front and behind. The indoor piping should be insulated with the enclosed insulation pipe. The pipe should first be cut longer than the length shown below. The excess section of the pipe should be cut off during pipe connection.

Diagram Description: Shows pipe arrangement before and after piping. Before piping, it indicates dimensions: 40mm above 270mm. After piping, it shows the arrangement of the small pipe and large pipe. It also depicts top and right side views for sideways piping, showing floor and wall clearances (R60, R80, 150mm or less, 130mm, 40mm). A floor installation diagram shows a hole in the floor.

⚠️ WARNING: For sideways piping, do not install the [drain hose] sideways. Connect the [drain hose] so that it comes out directly. Sideways installation of the [drain hose] will prevent it from sloping downward, causing water leakage. To avoid dripping, make sure to pass the [drain hose] under the pipe.

? CAUTION: Please ensure smooth flow of water when installing the [drain hose] of the Indoor unit during installation. (Carelessness may result in water leakage.)

Diagram Description: Illustrates the pipe support system. It shows how to affix the insulator (10) to the PIPE SUPPORT, sandwiching it. It also shows the PIPE SUPPORT tab hooking into a square hole. Another diagram shows mounting the PIPE SUPPORT so its cylindrical portion passes through the drain pan hole and securing it with screws. It mentions preventing rodents from entering the indoor unit.

Diagram Description: Shows pipe layout at the rear surface of the unit, including connecting cord, pipe, and insulator. Another diagram shows the pipe/drain hose layout when passing through a wall.

? CAUTION: When mounting the flare insulator [1], make sure there is a space between the insulator and the left of the resin part. Otherwise, it may cause water dripping.

3. Fixing the indoor unit

3.1 Floor Installation

Diagram Description: Illustrates floor installation. Steps include drilling holes on the [floor] (4.8mm), pushing [plugs] into the holes, and securing the indoor unit with screws (3 pieces, 4.1x32) to the floor. Dimensions like 32mm and 184mm or less are shown. It also shows fixing the base of the indoor unit on the [floor] with 4.1 x 32mm screws. A warning indicates securing with screw [3] to prevent overturn. It notes that if fixing the indoor unit above ground, an L-angle should be used at the bottom for support.

3.2 Wall Installation

Diagram Description: Illustrates direct wall mounting. It shows removing 3 screws and clips that fix the stand and cabinet. It also shows removing screws that fix the cabinet and hanger, advising the use of hidden beams in the [wall] to hold the hanger. Dimensions for the external dimension of the indoor unit are shown (20mm, 50mm, 470mm, 750mm). A level line is indicated.

? CAUTION: The draining of the water container inside the Indoor unit can be done from the left. Therefore, the [hanger] must be fixed horizontally or slightly tilted towards the side of the [drain hose]. Otherwise, condensed water may overflow the water container.

Procedures to fix the hanger and indoor unit:

1. Drill [holes] on [wall]. (As shown below)
2. Push [plug] into the [holes]. (As shown below)
3. Fix the [hanger] on [wall] with 4.1 X 32 and 4.0 X 34 screws. (As shown in figure below)
4. Fix the indoor unit on the [wall] with 4.1x32 screws.

Diagram Description: Shows the steps for fixing the hanger and indoor unit to the wall. It illustrates drilling holes, inserting plugs, fixing the hanger with screws (3 pieces, 4.1x32 and 9 pieces, 4.0x34), and then fixing the indoor unit with screws (3 pieces, 4.1x32). Wall dimensions (32mm) are indicated.

4. Installation of refrigerating pipes and air removal

4.1 Preparation of pipe

Use a [pipe cutter] to cut the copper pipe.

? CAUTION: Jagged edge will cause leakage. Point the side to be trimmed downwards during trimming to prevent copper chips from entering the pipe.

Before flaring, please put on the [flare nut].

Diagram Description: Shows a copper pipe being cut with a pipe cutter and trimming tool. It indicates the side to be trimmed downwards. It also shows a flare nut being placed on the pipe before flaring. An illustration of an "A (mm) Rigid Flaring Tool" is shown with dies for R410A/R32 and R22, along with a table listing Outer Diameter (Ø) and corresponding Die sizes (0-0.5, 1.0).

4.2 Pipe connection

Please be careful when bending the copper pipe. Screw in manually while adjusting the center. After that, use a [torque wrench] to tighten the connection.

Diagram Description: Illustrates pipe connection. It shows a flare nut being screwed onto a pipe, with a wrench and torque wrench indicated for tightening. It shows manual screwing followed by torque wrench tightening.

Gas leakage inspection

Please use a [gas leakage detector] to check if leakage occurs at the connection of the [flare nut] as shown on the right. If gas leakage occurs, further tighten the connection to stop leakage.

Diagram Description: Shows a gas leakage detector being used to check for leaks at the flare nut connection. It also indicates the valve head cap and valve core cap.

Removal and installation of front cover

1. Remove the front cover

1. Push the latch at both sides to open the front panel. Pull out the filter and remove 3 screws.
2. Lift up the front panel and latch the claws firmly at the lower part of the rear of the front panel. Then remove 3 screws.
3. Take off 2 screw caps at the lower part of the horizontal air deflector and remove 2 screws. Then leave the upper louver in open position.

Diagram Description: Step-by-step illustrations for removing the front cover. It shows pushing latches, removing filters and screws, lifting the panel, removing screw caps and screws from the horizontal air deflector, and opening the upper louver.

2. Install the front cover

1. Set the upper louver in open position.
2. Insert the front cover fixing claws (4 places) to the insertion groove of the cabinet and put the upper louver through to the front cover frame.
3. Put the horizontal air deflector to the lower part of front cover frame and insert to the cabinet.
4. After fixing the front cover, fix back all the screws in order.

Diagram Description: Step-by-step illustrations for installing the front cover. It shows setting the upper louver, inserting front cover fixing claws into the cabinet groove, and attaching the horizontal air deflector. It concludes with fixing all screws.

How to connect the optional parts (H-LINK RAC Adapter, Dry contact, Wired Remote Controller)

For cable connection to control P.W.B., you need to remove front cover and electrical box cover.

Each connecting location is as below:

• Dry contact: CN6
• H-LINK RAC Adapter: CN7
• Wired Remote Controller: CN20
• Gas Sensor: CN33

Please check and confirm manuals attached to each optional parts for more connection details.

You can refer to this installation manual how to remove and re-attach the front cover.

? CAUTION: Please be careful not to damage lead wires by edge of plate when connecting the optional parts.

Diagram Description: Shows a circuit board (P.W.B.) with connection points labeled CN6, CN7, CN20, and CN33, indicating where optional parts can be connected.

3. Connection of the connecting cord

Diagram Description: Illustrates the connection of the connecting cord. It shows removing the electric box cover, connecting the cords (labeled 1, 2, 3), and assembling the cover. Dimensions like 10mm, 35mm, and 70mm are indicated. The green + yellow wire for grounding is highlighted. A warning emphasizes leaving space for maintenance and securing the cord with a cord band, cautioning against pressure that could cause overheating or fire. It also shows a detail of cutting the connecting cord and provides a tightening torque reference value: 1.2 to 1.6 N·m (12 to 16 kgf·cm), warning against excessive tightening.

⚠️ WARNING: THIS APPLIANCE MUST BE EARTHED.

5. Connection of the connecting cord

(1) Remove the cover of the electric box.

(2) Connect the connecting cords.

(3) Assemble the cover of electric box.

Diagram Description: Shows the process of connecting the connecting cord. It illustrates removing the electric box cover, connecting the cords (labeled 1, 2, 3), and reassembling the cover. Dimensions like 10mm, 35mm, and 70mm are indicated. The green + yellow wire for grounding is highlighted. A warning emphasizes leaving space for maintenance and securing the cord with a cord band, cautioning against pressure that could cause overheating or fire. It also shows a detail of cutting the connecting cord and provides a tightening torque reference value: 1.2 to 1.6 N·m (12 to 16 kgf·cm), warning against excessive tightening.

⚠️ WARNING: THIS APPLIANCE MUST BE EARTHED.

6. Checking of drawing drain hose

(1) Connect the separate drain hose to the drain hose that is attached to the indoor unit.

(2) For keeping the smooth flowing of condensed water the drain hose should be inclined as shown in figure below.

Diagram Description: Illustrates correct and incorrect drain hose inclinations. It shows four 'Bad' examples with water ponds and ditches, indicating potential issues. It emphasizes a smooth downward slope and warns against loose connections or bends. A caution highlights the need for smooth water flow to prevent leakage.

7. Installation of remote controller

The remote controller can be placed in its holder which is fixed 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 fixed. The unit will beep when signal is received from the remote controller. The signal transmission is weaken by the fluorescent 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.

The remote controller must be slid in the remote controller holder, in the direction as shown in the figure, until it hooks at the lower end of the remote controller holder.

Diagram Description: Shows the remote controller and its holder. An arrow indicates the direction to slide the remote controller into the holder until it hooks.

8. Final stage of installation

8.1 Insulation and maintenance of pipe connection

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 figure showing the installation of Indoor and Outdoor units. Then fix their position with holders. To enhance 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.

Diagram Description: Illustrates insulation and maintenance of pipe connections. It shows sealing connected terminals with heat insulator and tying them with a strap. It also shows tying the pipe and power line together with vinyl tape and fixing them with holders. Another part shows covering the outdoor pipe and drain hose with insulation pipe and sealing gaps with putty. It depicts the outdoor and indoor sides with sleeve of protection pipe and putty.

8.2 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. If the indoor unit does not operate, check to see that the connections are correct.

? CAUTION: Trial run should be conducted on one unit at a time to check for incorrect wiring of connecting cord.

3-3 Built-in Installation

1. If the outlet is covered with the [lattice door], room temperature may not be controlled properly. Therefore, the air outlet must be open as much as possible.
2. If the air deflector of the air outlet is adjusted too much upward, room temperature may not be controlled properly due to the heat inside the [lattice door]. Therefore, the deflector must be adjusted to nearly horizontal angle.
3. If the signal receiver is covered with the [lattice door], signal receiving distance or range (angle) becomes smaller. Therefore, the signal receiver must not be covered with the [lattice door].
4. Only the vertical [lattice door] may be used. Be sure to use a [lattice door] with an open area ratio of 75% or more. If another [lattice door] or one with an open area ratio of less than 75% is used, maximum performance may not be obtained.
5. With a built-in installation, it may take more time to reach the set temperature after the unit is switched on.

Diagram Description: Illustrates clearances required for built-in installation. It shows a horizontal air deflector (air intake) with a clearance of Above 150mm. It shows the horizontal air deflector (air outlet) with a clearance of Above 100mm and Above 200mm. It also indicates a 30mm clearance for the air conditioner itself and the signal receiver.

4. Installation of refrigerating pipes and air removal

4.1 Preparation of pipe

Use a [pipe cutter] to cut the copper pipe.

? CAUTION: Jagged edge will cause leakage. Point the side to be trimmed downwards during trimming to prevent copper chips from entering the pipe.

Before flaring, please put on the [flare nut].

Diagram Description: Shows a copper pipe being cut with a pipe cutter and trimming tool. It indicates the side to be trimmed downwards. It also shows a flare nut being placed on the pipe before flaring. An illustration of an "A (mm) Rigid Flaring Tool" is shown with dies for R410A/R32 and R22, along with a table listing Outer Diameter (Ø) and corresponding Die sizes (0-0.5, 1.0).

4.2 Pipe connection

Please be careful when bending the copper pipe. Screw in manually while adjusting the center. After that, use a [torque wrench] to tighten the connection.

Diagram Description: Illustrates pipe connection. It shows a flare nut being screwed onto a pipe, with a wrench and torque wrench indicated for tightening. It shows manual screwing followed by torque wrench tightening.

Gas leakage inspection

Please use a [gas leakage detector] to check if leakage occurs at the connection of the [flare nut] as shown on the right. If gas leakage occurs, further tighten the connection to stop leakage.

Diagram Description: Shows a gas leakage detector being used to check for leaks at the flare nut connection. It also indicates the valve head cap and valve core cap.

Removal and installation of front cover

1. Remove the front cover

1. Push the latch at both sides to open the front panel. Pull out the filter and remove 3 screws.
2. Lift up the front panel and latch the claws firmly at the lower part of the rear of the front panel. Then remove 3 screws.
3. Take off 2 screw caps at the lower part of the horizontal air deflector and remove 2 screws. Then leave the upper louver in open position.

Diagram Description: Step-by-step illustrations for removing the front cover. It shows pushing latches, removing filters and screws, lifting the panel, removing screw caps and screws from the horizontal air deflector, and opening the upper louver.

2. Install the front cover

1. Set the upper louver in open position.
2. Insert the front cover fixing claws (4 places) to the insertion groove of the cabinet and put the upper louver through to the front cover frame.
3. Put the horizontal air deflector to the lower part of front cover frame and insert to the cabinet.
4. After fixing the front cover, fix back all the screws in order.

Diagram Description: Step-by-step illustrations for installing the front cover. It shows setting the upper louver, inserting front cover fixing claws into the cabinet groove, and attaching the horizontal air deflector. It concludes with fixing all screws.

How to connect the optional parts (H-LINK RAC Adapter, Dry contact, Wired Remote Controller)

For cable connection to control P.W.B., you need to remove front cover and electrical box cover.

Each connecting location is as below:

• Dry contact: CN6
• H-LINK RAC Adapter: CN7
• Wired Remote Controller: CN20
• Gas Sensor: CN33

Please check and confirm manuals attached to each optional parts for more connection details.

You can refer to this installation manual how to remove and re-attach the front cover.

? CAUTION: Please be careful not to damage lead wires by edge of plate when connecting the optional parts.

Diagram Description: Shows a circuit board (P.W.B.) with connection points labeled CN6, CN7, CN20, and CN33, indicating where optional parts can be connected.