Hitachi airHome 300 Split Unit Air Conditioner Installation Manual

Safety Precautions

General Warnings

[Warning] Carefully read through the procedures of proper installation before starting installation work.

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

[Warning] Improper installation may cause water leakage, electric shock and fire.

[Warning] Ensure units are mounted at locations providing full support to their weight. Otherwise, units may collapse and impose danger.

[Warning] Must install air conditioner according to the electrical installation standards for Thailand of the Engineering Institute of Thailand under The Royal Patronage of His Majesty (the King).

[Warning] Be sure to use the specified wire for connecting the indoor and outdoor units. Ensure connections are tight. Improper insertion and loose contact may cause over-heating and fire.

[Warning] Please use the specified components for installation work. Otherwise, units may collapse or water leakage, electric shock and fire may occur.

[Warning] Be sure to use the specified piping set for R32. Otherwise, this may result in broken copper pipes or faults.

[Warning] When installing or removing an air conditioner, only specified refrigerant (R32) shall be allowed. Do not allow air or moisture to remain in the refrigeration cycle. Otherwise, pressure may become abnormally high, causing rupture.

[Warning] Be sure to ventilate fully if refrigerant gas leaks while at work. If refrigerant gas contacts fire, poisonous gas may occur. Be aware that refrigerants may not contain an odour.

[Warning] After completion of installation, check for refrigerant gas leakage. If refrigerant gas leaks into the room and contacts fire in a fan-driven heater, space heater, etc., poisonous gas may occur.

[Warning] Unauthorized modifications to the air conditioner may be dangerous. If a breakdown occurs, call a qualified air conditioner technician or electrician. Improper repairs may result in water leakage, electric shock, and fire.

General Cautions

[Caution] A circuit breaker must be installed. Without a circuit breaker or fuse, the danger of electric shock exists.

[Caution] A main switch with a contact gap of more than 3mm must be installed in the power supply line to the outdoor unit.

[Caution] 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.

[Caution] Do not install the indoor unit in a machine shop or kitchen where vapor from oil or its mist flows to the indoor unit. Oil will deposit on the heat exchanger, reducing performance and potentially deforming or breaking plastic parts.

[Caution] Please ensure smooth flow of water when installing the drain hose.

[Caution] Piping shall be suitably supported with a maximum spacing of 1m between supports.

[Caution] Flare nut must use a torque wrench without fail. Tighten with the specified tightening torque. Over-tightening may cause the flare nut to break over time, leading to gas leakage, stagnation, and potential ignition.

[Caution] Sharp bending of the pipe requires the use of a polyethylene rod to prevent crushing. Gas leakage from a crushed part can lead to stagnation and ignition.

[Caution] Please request your sales agent or qualified technician to install your unit. Doing it yourself may cause water leakage, short circuit, or fire.

[Caution] Please observe the instructions stated in the installation manual during installation. Improper installation may cause water leakage, electric shock, and fire.

[Caution] Please ensure smooth flow of water when installing the drain hose.

[Caution] Piping shall be supported with a maximum spacing of 1m between supports.

[Caution] 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. 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.

Tools Needed For Installation Work

• [Tool: Screwdriver]
• [Tool: Measuring Tape]
• [Tool: Knife]
• [Tool: Saw]
• [Tool: Pipe Cutter]
• [Tool: Hexagonal Wrench Key (4mm)]
• [Tool: Power Drill (Ø 65mm ~ Ø 80mm)]
• [Tool: Vacuum Pump]
• [Tool: Pliers or Wrench]
• [Tool: Torque Wrench]
• [Tool: Vacuum Pump Adaptor]
• [Tool: Flare Tool]
• [Tool: Gas Leakage Detector]
• [Tool: Manifold Valve]
• [Tool: Charge Hose]
• [Tool: Reammer]
• [Tool: File]

Mounting Site Selection

Indoor Unit

The Choice of Mounting Site

[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, 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 the indoor unit must be 2.5m or more.

Outdoor Unit

The Choice of Mounting Site

[Warning] The outdoor unit must be mounted at a location which can support heavy weight. Otherwise, noise and vibration will increase.

[Caution] Selecting the installation location: Suitable location that will reduce the impact from rain and direct sun that may affect the unit performance. Besides that, 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 the figure below. At least three 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 connection wire at least 1m away from the antenna or signal line of television, radio, or telephone. This is to avoid noise interference.

Do not install the outdoor unit facing strong wind direction. It may damage the fan motor.

Do not install the outdoor unit in a place where small animals may build their nests. If small animals go inside the unit and touch electrical parts, failure of the unit, smoke, or fire may be caused. Request your customer to keep the surrounding of the unit clean.

Installation of Indoor and Outdoor Unit Components

Figure showing the Installation of Indoor and Outdoor Unit: The diagram illustrates the indoor unit mounted on a wall, with recommended clearances indicated from the top, left, and right sides. The outdoor unit is shown below, also with clearance requirements. The path for piping and drain hoses connecting the two units is depicted.

Allowed Piping Directions: There are 6 directions allowed for piping: horizontally perpendicular to the unit, vertically down from right, horizontally out from right, horizontally out to left, horizontally out to right, and vertically down from left.

[Caution] In case the pipe length is more than the recommended length for chargeless, add refrigerant R32 as below. Do not exceed the maximum pipe length.

[Caution] A brazed, welded, or mechanical connection shall be made before opening the valves to permit refrigerant to flow. A vacuum valve shall be provided to evacuate the interconnecting pipe and/or any uncharged refrigerating system.

Mechanical connectors used indoors shall comply with ISO 14903. When mechanical connectors are reused indoors, sealing parts shall be renewed. When flare joints are reused indoors, the flare part shall be re-fabricated.

Refrigerant tubing shall be protected or enclosed to avoid damage.

Be sure to completely seal any gap with putty.

[Warning] Flare connection only at outside of building.

[Caution] Installation of pipe length less than minimum pipe length requirement (3 meters) may generate an abnormal sound.

Refrigerant piping must be protected from physical damage. Install a plastic cover or equivalent.

The indoor piping should be insulated with the enclosed insulation pipe. (If the insulator is insufficient, please use commercial products).

The connection of the insulated drain hose. Please use insulated drain hose for the indoor piping (commercial product).

Installation of Indoor Unit

1 Installation of Hanger, Wall Penetration and Installation of Protection Pipe

[Caution] The draining of the water container inside the indoor unit can be done from the left. Therefore, the mounting plate must be fixed horizontally or slightly tilted towards the side of the drain hose. Otherwise, condensed water may overflow the water container.

Direct Mounting On The Wall

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

Procedures to fix the mounting plate:

1. Drill holes on wall.
2. Push plug into the holes.
3. Fix the mounting plate on wall with 4.1 x 32 screw.

Procedures to fix the holder of remote control:

1. Drill holes on wall.
2. Push plug into the holes.

Wall Penetration and Installation of Protection Pipe

Drill a Ø 65mm hole on the wall which is slightly tilted towards the outdoor side.

[Warning] Drill the wall at a small angle.

Cut the protection pipe according to the wall thickness.

The empty gap in the sleeve of the protection pipe should be completely sealed with putty to avoid dripping of rain water into the room. Unless it seals completely, any air with high humidity flows from the outdoor and dew may drop.

[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 damage by mouse.

2 Installation of the Indoor Unit

VERTICALLY DOWNWARD PIPING

Preparation

• Connect connecting cord.
• Pull out the pipe, connecting cord, and drain hose.

Installation

• The upper part of the indoor unit is hanged on the mounting plate.
• The projection at the lower part of the indoor unit is hooked onto the mounting plate.

[Caution] Please pull the lower part of the indoor unit outwards to check if the unit is hooked onto the mounting plate. Improper installation may cause vibration and noise.

HORIZONTAL PIPING

Preparation

Change of Drain Hose and Installation Procedures.

Exchange the location of drain hose and drain cap during horizontal piping as shown in the figure below. Be sure to plug in the drain hose until the insulating material folds upon itself.

Please use pliers to pull out the drain cap. (This is an easier way to remove the drain cap).

Drain cap: Remove the cap for drain hose installation.

Drain cap shall be fully tightened by pushing with Hexagonal wrench key when changing location.

[Caution] Condensed water may leak out if not inserted properly.

[Caution] Do not guide the drain hose to places where corrosive gases (sulfur, ammonia, etc.) are generated, such as septic tanks and sewer. Corrosive gas may flow backward from the drain hose to the indoor unit, corrode the copper pipe, or it may cause offensive odors in the room.

Cut the drain hose at a position 100 mm higher than the floor surface. It may cause water leakage due to air lock or clogging of foreign matter.

[Caution] Be sure that the drain hose is not loosely connected or bent.

[Caution] You are free to choose the side (left or right) for the installation of the drain hose. Please ensure the smooth flow of condensed water of the Indoor unit during installation. (Carelessness may result in water leakage.)

Installation:

• Hang the Indoor unit onto the mounting plate.
• Use the temporary stand at the back of the Indoor unit to push its lower part 15cm forwards.
• Place the drain hose through the hole on the wall.
• Wrap the refrigerating pipes with insulation pipe after connecting refrigerating pipe.
• Connect the connecting cord after removing electrical cover. (Refer to "Connection of Power Cord")
• After adjustment, the connecting cord and refrigerating pipes are placed into the space available under the Indoor unit.
• The projection of Indoor unit must hook to the mounting plate.

3 Installation of Refrigerating Pipes After Connection

The refrigerating pipes should be adjusted to fit into the hole on the wall and then ready for further connection.

The terminals of 2 connected pipes must be covered with insulator used for terminal connection. Then the pipes are wrapped with insulation pipe.

Connect the connecting cord after removing electrical cover. (Refer to "CONNECTION OF POWER CORD")

After adjustment, fit the connecting cord and pipes into the space available under the indoor unit.

[Caution] The rubber strap used for fixing the insulator should not be tied with great force. Otherwise, this will damage heat insulation and cause water condensation.

THE CONNECTION OF REFRIGERATING PIPE DURING THE INSTALLATION OF INDOOR UNIT

Preparation To Install Refrigerating Pipes:

The refrigerating pipes and connecting cord arrangement are attached.

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

[Caution] Please fix in the plastic core after flaring to avoid copper chips entering the pipes.

Heat insulation pipe

Connecting cord

Refrigerating pipe

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

Outdoor Unit Installation

[Warning] 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 different types of pipe available.

Open the service valve cover by unscrewing the screws as shown below.

Use the two spanners on the service valve nuts to tighten and loosen so that the service valve will not deform. Gas leak from the crushed part, stagnation, touching fire, rarely cause ignition.

PURGING OF REFRIGERANT IS PROHIBITED

Purging of refrigerant will cause the unit to be lacked of refrigerant which may affect the capacity performance and lead to severe dew formation causing problem such as dew water drop or splashing from the unit.

Do not solder pipes or other parts filled with refrigerant with low-temperature doped welding wire, such as tin-alloyed lead-doped metal.

When connecting pipes, if you tighten the flare nut by excess torque, the service valve on the small pipe side may be broken. The flare nut on the small pipe side should be torqued to 122 - 165lbf.in (140 - 190kgf.cm).

[Warning] BURST HAZARD

Do not allow air, etc. to get into refrigerant cycle (piping).

[Warning] RISK OF EXPLOSION

Compressor must be stopped before removing refrigerant pipes. All service valve must be fully closed after pumping down operation.

[Warning] THIS APPLIANCE MUST BE EARTHED.

Must install air conditioner according to the electrical installation standards for Thailand of the Engineering Institute of Thailand under The Royal Patronage of His Majesty (the King).

INSTALLATION OF REFRIGERATING PIPES AND AIR REMOVAL

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.

Recommend to use R32 flaring tool.

2 Pipe Connection

[Caution] When removing flare nut from the Indoor unit, please ensure to use proper tooling.

Prevent pipe from coming in contact with water or working in wet area.

[Caution] Prevent moisture from entering pipe connection.

Refrigerating machine oil must not be applied to the outside of the flare. When refrigerating oil is applied to the outside of the flare, cracking of the flare nut, destruction of the flare, and gas leakage may occur due to excessive tightening of the flare nut.

When using the control valve, do not use deteriorated packing. And, do not overtighten the steering wheel. Gas leakage from the service valve part, stagnation, touching fire, rarely cause ignition.

3 Removal Of Air From The Pipe And Gas Leakage Inspection

Procedures of using Vacuum Pump for Air Removal:

As shown in the right figure, remove the cap of the valve core. Then, connect the charge hose.

1. Remove the cap of the valve head. Connect the vacuum pump adapter to the vacuum pump and connect the charge hose to the adapter.
2. Fully tighten the "Hi" knob of the manifold valve and completely unscrew the "Lo" knob. Run the vacuum pump for about 10~15 minutes, then completely tighten the "Lo" knob and switch off the vacuum pump. After vacuuming, confirm that the needle of the manifold gauge is stable for 3~5 minutes.
3. Remove the charge hose and tighten the cap of the valve core. Check the cap's periphery if there is any gas leakage.

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

[Diagram Description: A diagram shows the connection of a vacuum pump to the air conditioning system via a manifold valve and charge hose. It illustrates the valve head, valve core cap, and the pressure gauge.]

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

AIR REMOVAL

Completely unscrew the spindle of the service valve (at 2 places) in anti-clockwise direction to allow the flow of refrigerant (using Hexagonal Wrench key).

Re-cap the service valve and tighten using a wrench. Check the cap's periphery if there is any gas leakage. The task is then completed.

[Caution] Prevent moisture from entering pipe connection.

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. (Use the detector provided for R32).

Wiring Of The Indoor Unit

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

Method to remove front panel

Please refer to Instruction Manual – "Removing the Front Panel" under "Cleaning of Front Panel".

Method to remove electrical cover

• Remove the screw and electrical cover.
• Insert the connecting cord (1, 2, 3) from the back of the unit.
• Fix the wire to terminal wires firmly as shown below.

[Diagram Description: Shows the electrical cover being removed, revealing terminals where the connecting cord is inserted and fixed.]

Electrical cover

Screw

Connecting cord

Wiring Of The Outdoor Unit

Please remove the side plate for wire connection.

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

[Warning] Leave some space in the connecting cord for maintenance purpose and be sure to secure it with the cord band.

Secure the connecting cord along the coated part of the wire using the cord band. Do not exert pressure on the wire as this may cause overheating or fire.

Supply cords, current-carrying conductors become taut before earthing conductor, if the cord slips out of the cord band.

Earth terminal

1 2 3

[Diagram Description: Shows the side plate of the outdoor unit removed for wiring. It illustrates securing the connecting cord with a cord band and connecting to terminals labeled 1, 2, 3, and an earth terminal.]

[Caution] Note: Outdoor supply cords shall not be lighter than polychloroprene sheathed flexible cord, 60245 IEC 57.

[Caution] Be sure that the hooks of the side plate are fixed in certainly. Otherwise, water leakage may occur and this causes short circuit or faults.

CONNECTION OF POWER CORD

When removing the connecting wires for the indoor unit, please remove the low cover panel in front of the unit.

[Warning] The naked part of the wire core should be 10 mm. 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.

[Warning] Be sure to use only wire specified for the use of air-conditioner.

[Warning] Please refer to the manual for wire connection and the wiring technique should meet the standard of the electrical installation.

There is an AC voltage drop between the LN terminal if the power is on. Therefore, be sure to remove the plug from its socket.

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

Connect the earth cord.

IMPORTANT Fuse Capacity: 13A

FINAL STAGE OF INSTALLATION

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.

2 Power Source And Operation Test

Power Source

[Caution] Please use a new socket. Accidents may occur due to the use of an old socket because of poor contact.

Please plug in and then remove the plug for 2~3 times. This is to ensure that the plug is completely plugged into the socket.

Keep additional length for the power cord and do not render the plug under external force as this may cause poor contact.

Do not fix the power cord with U-shape nail.

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 a wrong supply voltage is applied:

If a 220-240V model is connected to a 100V power supply, all the indicators of the indoor unit blink. Correct the voltage of the power outlet (It is not a failure).

Trial run:

Be sure to measure the supply voltage before connecting the power cord into the power outlet.

Perform a trial run to make sure that the air conditioner operates properly.

1. Press the COOL button (in summer) or HEAT button (in winter) of the remote controller.
2. Press the ROOM TEMPERATURE button to set the temperature to 16°C for cooling mode or 32°C for heating mode. Set the fan speed to " " (HI).
3. Operate the air conditioner for at least 20 minutes and make sure that the air from the air conditioner is cool or warm.
4. Press the STOP button on the remote controller to make sure that the air conditioner stops running.

If the indicators of the indoor unit blink during the trial run, perform a check following the procedures below.

To reset the power supply by switching the circuit breaker OFF, and ON only after:

1. waiting for at least 5 minutes; or
2. pressing the temporary switch button only once while the power is OFF.

3 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 weakened by 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 controller should be inserted from top into bottom side of the holder as shown below.

Pump Down Method When Reuse Existing Piping

For R410A Model / R32 Model

Compressor oil of R410A model is insoluble in compressor oil of R32 model. The mixing of compressor oil may cause damage to the compressor.

Possibility of Mixing: Reuse of piping of R410A model is dangerous because of its compressor oil.

When reusing piping of R410A model, pump down must be carried out properly to ensure compressor oil which is remained inside piping is collected away.

[Caution] Reuse of piping R410A model only applies if the previous model is Hitachi and proper pump down method is used.

To Reuse Old Piping:

Piping of R410A model can be reused only when the air conditioner is properly pumped down.

The purpose of pump down is to collect back the compressor oil (which is mixed with refrigerant and circulating inside refrigeration cycle) properly into the outdoor unit of air conditioner.

[Warning] Transport Details Marking and storage:

• Air conditioners that use flammable refrigerants.
• Transportation of air conditioners containing combustible refrigerant.
• Disposal of air conditioners using flammable refrigerants.
• Air conditioning storage.
• Storage of air conditioners in packaging (not yet sold).

Proper Pump Down Method:

1. Operate air conditioner at cooling mode for 10~15 minutes. Most Important Process Purpose: To make the oil & refrigerant mix together. They are in separated condition when air conditioner is stopped.
2. After 10~15 minutes of pre-operation, close 2s valve. After 3 minutes, close 3s valve. Mixed refrigerant & oil will be collected into outdoor unit.
3. Take out air conditioner unit. It is advisable to flush the piping with R32 to avoid any contamination remain before new installation.
4. Install New Refrigerant air conditioner.

Explanation of symbols displayed on unit

[Warning] This symbol shows that this equipment uses a flammable refrigerant. If the refrigerant is leaked, together with an external ignition source, there is a possibility of ignition.

[Caution] This symbol shows that the Operation Instructions should be read carefully.

[Caution] This symbol shows that a service personnel should be handling this equipment with reference to the Installation Manual.

[Caution] This symbol shows that there is information included in the Operation Manual and/or Installation Manual.

[Warning] Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. Any unfit method or using incompatible material may cause product damage, burst, and serious injury.

The appliance/pipe-work shall be stored in a well-ventilated room with floor area larger than Amin(m²) and without any continuously operating ignition source. Keep away from open flames, any operating gas appliances or any operating electric heater. Else, it may explode and cause injury or death.

The appliance/pipe-work shall be installed, and/or operated in a room with floor area larger than Amin(m²) and keep away ignition sources, such as heat/spark/open flame or hazardous areas such as gas appliances, gas cooking, reticulated gas supply systems or electric cooking appliances, etc.

Do not pierce or burn as the appliance is pressurized. Do not expose the appliance to heat, flame, sparks, or other sources of ignition. Else, it may explode and cause injury or death.