HITACHI RAF-25NH5 Inverter System Multi Type Indoor Unit Instruction Manual

HITACHI RAF-25NH5 Inverter System Multi Type Indoor Unit

FOR SERVICE PERSONNEL ONLY

• Carefully read through the procedures of proper installation before starting installation work.
• The sales agent should inform customers regarding the correct operation of installation.
• Explanation for outdoor unit is in the “How To Use” (Instruction Manual) that packed with outdoor unit.

Tools Needed For Installation Work
(Mark is exclusive use tool for R410A)

• ª· Screwdriver
• Measuring Tape
• Knife
• Saw
• ø65mm Power 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 Manifold Valve Charge
• Hose Vacuum Pump

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.
• Make sure to connect earth line.
• This sign in the figures indicates prohibition.
• Be sure that the unit operates in proper condition after installation. Explain to customer the proper watt 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 are approved official in your country. 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 unit may collapse or water leakage, electric shock and fire may occur.
• When installing or transferring an air conditioner to another location, make sure that air other than the specified refrigerant (R410A) 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 use the specified piping set for R410A. Otherwise, this may result in broken copper pipes or faults.
• When installing or removing an air conditioner, do not allow air or moisture to remain in the refrigeration cycle. Otherwise, pressure in the refrigeration cycle may become abnormally high so that a rupture may be caused.
• Be sure to ventilate fully if a refrigerant gas leak while at work. If the refrigerant gas comes into contact with 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. Improper earthing may cause electric shock.

CAUTION

• A circuit breaker must be installed in the house distribution box for the direct connected power supply wire to the outdoor unit. In case of other installations a main switch with a contact gap or 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. Piping shall be suitable supported with a maximum spacing of 1m between the supports.
• Please ensure smooth flow of water when installing the drain hose.
• An IEC approved power cord should be used. Power cord type: NYM.

THE CHOICE OF MOUNTING SITE
(Please note the following matters and obtain permission from customer before installation.)

WARNING: The unit should be mounted at stable, non-vibratory location which can provide full support to the unit.

CAUTION

• No nearby heat source and no obstruction near the air outlet is allowed.
• The clearance distances from top, right and left are 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 and television.
• To avoid any error in signal transmission from the remote controller, please put the controller far away from highfrequency machines and high-power wireless systems.

Names of Indoor Components

[Indoor unit installation]

Installation of wall penetration and installation of protection pipe

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

Wall penetration and installation of protection pipe

• Drill a ø65mm 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.

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.

Installation of the indoor unit

How to remove the front cover

1. Remove the front panel (refer to instructions on the reverse of this sheet).
2. Remove the front cover.
   • Remove the two bottom screws and two top screws. Pull the front cover approximately 30mm toward you.
   • When attaching the front cover, follow the above procedure in reverse order. Make sure the hooks at the front cover top surface are securely inserted into the cabinet.

For sideways piping
For right or left sideways piping, cut the cabinet’s bushing with a plastic cutter or similar tool and use a file for an attractive finish.

Drain pipe

• Make sure 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: 600mm) 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.

Connecting the pipe to indoor unit

• Draw in the pipes through the hole of the wall or the floor to indoor.

• Arrange the pipe shown below. In the case that large pipe and small pipe arrange to make 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.

• Remove PIPE SUPPORT 1 and PIPE SUPPORT 2.

• Insert the drain hose into the hole in the wall.

• Winding insulation pipe for drain hose and taping 4 or 5 places to fix.

• Connect the pipe to the Indoor unit.

• After completing the piping connection, cover the connector with the insulator.

• Connect the cord (follow instructions in the section “5. Connection of the connecting cord” on the reverse of this sheet).

• Since there is some space between PIPE SUPPORT 2 and the pipe, affix the insulator 0 to the PIPE SUPPORT 2. As shown in the figure on the right, affix the insulator 0 to the PIPE SUPPORT 2 to sandwich it.

• After connecting the pipes and connecting cord, be sure to screw PIPE SUPPORT 1, PIPE SUPPORT 2 tightly and fix the pipes and connecting cord.

• Position the easy-to-attach side of PIPE SUPPORT 2 (after aligning it with the pipe) to face the front and secure it with a screw. (Be sure to install PIPE SUPPORT 2 to prevent rodents from entering the indoor unit.)

• To prevent the pipe connector from contacting the front cover, push the connector as far as it goes.

• Arrange the connecting cord, pipes and drain hose neatly and store them in the bottom section of the rear surface of the indoor unit.

Fixing the indoor unit

Fixing the base of indoor unit
Fix the base of indoor unit on the floor with 4.1 × 32mm screws. (Right and left)

To drill holes, either Case 1 or 2 may be used.

BUIIT-IN INSTALLATION

1. If upper or lower air outlet is covered with the lattice door, room temperature may not be controlled properly. Therefore, air outlet must be open as much as possible.
2. If air deflector of upper 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 signal receiver is covered with the lattice door, signal receiving distance or range (angle) becomes smaller. Therefore, 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.

Installation of refrigerating pipes and air removal

Preparation of pipe

• Use a pipe cutter to cut the copper pipe.
• Before flaring, please put on the flare nut.

Outer Diameter (ø)

| A (mm) Rigid Flaring Tool
---|---
For R410A tool| For R22 tool
6.35 (1/4″)| 0 – 0.5| 1.0
9.52 (3/8″)| 0 – 0.5| 1.0
12.7 (1/2″)| 0 – 0.5| 1.0

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.

Large diameter side

| 9.52 (3/8″)| 34.3 – 44.1 (350 – 450)
12.7 (1/2″)| 44.1 – 53.9 (450 – 550)

Valve head cap

| Small diameter side| 6.35 (1/4″)| 19.6 – 24.5 (200 – 250)

Large diameter side

| 9.52 (3/8″)| 19.6 – 24.5 (200 – 250)
12.7 (1/2″)| 29.4 – 34.3 (300 – 350)
Valve core cap| 12.3 – 15.7 (125 – 160)

Gas leakage inspection
Please use gas leakage detector to check if leakage occurs at connection of flare nut as shown on the right. If gas leakage occurs, further tighten the connection to stop leakage. (Use the detector provided for R410A.)

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.

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.

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.

Final stage of installation

Insulation and maintenance of pipe connection

• The connected terminals should be completed 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.

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.

How to install and remove the front panel

• Be sure to use both hands to grasp the front panel when removing it or attaching it.
• The front panel may be installed up or down to suit user preference.

Removing

Documents / Resources

| HITACHI RAF-25NH5 Inverter System Multi Type Indoor Unit [pdf] Instruction Manual
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