Hitachi Inverter System Single Cooling

SAFETY PRECAUTION

A WARNING

• Read all instructions carefully before starting installation.
• This unit must be installed by qualified personnel.
• Ensure proper grounding.
• Do not install in locations where there is a risk of explosion or fire.
• Follow all local electrical codes.

A CAUTION

• Handle the unit with care to avoid damage.
• Ensure adequate ventilation.
• Keep children away from the installation area.

Diagram Description: General installation precautions showing required distances from walls, ceiling height, and ventilation requirements for the indoor unit.

Diagram Description: Indoor unit components illustrating the air inlet, air outlet, filter, drain pan, and electrical box locations.

Diagram Description: Mounting diagram depicting how suspension brackets attach to sling bolts and the indoor unit for hanging.

3 Installation of Indoor Unit

Marking of the Positions of the Sling bolts and Piping Connections

1. Mark the positions of the sling bolts, refrigerant piping connections and drain connection.
2. Ceiling Work: This varies according to the building structure. Consult with the architect or interior finish worker for more information.
   • (a) To maintain the appropriate levelness of the ceiling and prevent vibration, additional reinforcement in the ground of the ceiling (Building Frame) is essential. Rubber cushion can be applied for insufficient strength of the frame around the sling part on the ceiling.
   • (b) Provide a space for the air inlet grille, air outlet grille, and maintenance work.
   • (c) Do not suspend the indoor unit and electric light units from the same auxiliary supporting beams, and do not connect the suspension bolts on the indoor units. If connected, the light may flicker or the light unit may be rattled by the vibration of the indoor units.

A CAUTION

• If a lower sound level is still required, install a silencer (field-supplied).
• The facility design should be "Unit External static Pressure = Duct Pressure Loss Suction / Discharge Loss". If the duct pressure loss is less than the unit external static pressure, air speed will increase, leading to louder noise, splashing water, and activation of the motor protection circuit. If the unit external static pressure is less than the duct pressure loss, problems such as inability to change air speed may occur. Set the airflow control damper or shift the static pressure control switch to adjust to achieve an almost equal level between the external static pressure and the duct pressure loss. (See "Setting of External Pressure" section for details.)
• This unit is designed to install ducts on the inlet and outlet sides.

Mounting the indoor unit

Hanging indoor unit.

Field-Supplied Parts: Sling Bolts (4-M10 or W3/8), Nut & Washer (4-M10 or W3/8), Nut (Field-Supplied).

Accessory: Washer.

Diagram Description: Ceiling structure with suspension bolts and reinforcing beams for indoor unit mounting.

Diagram Description: Indoor unit shown with suspension brackets attached to sling bolts for hanging.

Diagram Description: Illustrates canvas ducts connecting the unit to supply and return air ducts, including silencers and dampers for airflow control.

Diagram Description: Shows the air outlet, air inlet, service access panel, and outdoor air intake with filter.

Diagram Description: Depicts changing the inlet air direction by modifying the back cover.

1. How to put Nuts or Sling Bolts: Put nuts on each of the four hanging bolts. Washer. Nut.
2. Hanging the Indoor unit: Hook suspension bracket to the nut and washer of each hanging bolt, starting at the opposite side to the service cover. After checking that the nut and washer are correctly fixed by the retainers of the suspension bracket, hook the suspension bracket of the service cover side to the nut and washer. (Keep sling bolts away from the unit when hooking.)

Piping and wiring work will be required in the ceiling after hanging the unit. Determine the drawing direction of the pipe after selecting the installation location, especially if the ceiling has existing piping. Wiring work should be carried out up to the connecting positions before hanging the unit.

3. For disaster prevention, follow the distances shown in the figure below between the under roof and the wall surface.

Use nonflammable material for the duct.

4. If the flange is to be kept at the discharge side, fix screw 2 at 8 positions. If the flange is not to be kept, remove the 4 screws that fixed the flange.

Connection of drain pipe

1. Securely glue the connection part of the drain hose and PVC pipe using PVC adhesive.

A CAUTION: If the glue between the drain hose and PVC pipe is too weak, water leakage may occur.

2. Be sure to wrap generally-available insulator (10mm or more of foamed polyethylene) around the drain hose, inside the house, for heat insulation.
3. Checking drain and water leakage. Perform after connecting power.
   • Add water to the water pan of the indoor unit.
   • Remove the lid of the electric box and set the drain pump test run switch to TEST RUN. After checking the drainage, return the switch to NORMAL.
   • Perform a test run of the drain pump to check drainage operation.

A CAUTION: If checking of drainage is omitted, water loss may occur. If the drain pump test run is left set to TEST RUN, the drain pump may malfunction.

Diagram Description: Drain pump test drive switch with NORMAL and TEST RUN positions.

Adjusting of the Unit Level

1. Check to ensure that the foundation is flat, taking into account the maximum foundation gradient. If not, the float switch may malfunction or the unit may not operate, causing drain water to drop from the ceiling.
2. The unit should be installed so that the rear side of the unit is slightly (0mm to 5mm) lower than the front side, to avoid incorrect drain discharge positioning.
3. Tighten the bolts of the sling nuts with the suspension brackets after adjustment is completed. Special plastic paint must be applied to the bolts to prevent them from loosening.

Keep the unit and relevant equipment covered with a vinyl cover during installation work.

Connecting Return Duct and Supply Duct

1. The return duct should be connected to the indoor unit through canvas ducts between the inlet side of the indoor unit and the ceiling of the room. The supply duct should be connected to the indoor unit through canvas ducts to avoid abnormal sound and vibration. The unit is equipped with a pre-drilled duct flange for return and supply duct connection.
2. Attach the vibration-proof rubber to the Sling Bolt to avoid abnormal sound and vibration.
3. Undamped natural frequency is 9 to 21 Hz.
4. Duct material should be non-flammable material.
5. Perform heat insulation work over the duct and the duct flange for dew protection.

5 Pipe Connection

After connecting the refrigerant piping, seal the refrigerant pipes using the factory-supplied insulation material.

Diagram Description: Shows refrigerant pipes, factory-supplied insulation material, binder, and rubber strap for securing insulation.

A 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.

6 Checking of drain hose

1. Connect the separate drain hose to the drain hose attached to the indoor unit.
2. For smooth flowing of condensed water, the drain hose should be inclined as shown in the figure below.

Diagram Description: Illustrates correct and incorrect ways to route the drain hose to ensure smooth water flow and prevent water pooling or air locks.

A CAUTION: Please ensure the smooth flow of condensed water of the indoor unit during installation. (Carelessness may result in water leakage.)

A CAUTION: Be sure that the hose is not loosely connected or bent.

9 Installation of wireless remote controller (optional)

• The remote controller can be placed in its holder, which is then fixed on a wall or beam.
• The remote controller must be able to slide into the remote controller holder in the direction shown in the figure until it hooks onto the lower end of the holder.
• To operate the remote controller from its holder, ensure the unit can receive the signal transmitted from the controller at the holder's location. The unit will beep when a signal is received. Signal transmission is weakened by fluorescent light. Therefore, during holder installation, switch on the light, even during daytime, to determine the mounting location.

Diagram Description: Shows the wireless remote controller, its holder, plug, and AAA battery.

10 Installation of display panel (Optional)

• Select an installation position on the ceiling or wall where there are no obstacles to interrupt signal reception.
• Loosen screws of the panel installation plate so that the bracket can be slightly moved.
• Match the display panel to the panel installation plate so the fixing claws on the panel are securely hooked.
• Match brackets to the opening on the ceiling or wall and tighten screws until the bracket is firmly secured to the ceiling material.
• Install the panel cover so the inside claws are securely hooked to the panel installation plate.
• Conduct the indoor unit side housing of the display panel cord to the electric box of the indoor unit and connect it with the housing at the side of the unit.

A CAUTION: Please disconnect the wired remote controller connector at CN1102 if using the wireless remote controller.

Diagram Description: Depicts mounting the display panel, bracket, and cover, and connecting the display panel cord to the unit's control board (CN11A).

Diagram Description: Shows connecting the display panel cord to the CN11A connector on the control PWB.

A CAUTION: Be sure that the wire is not in contact with any metal in the wall. Use the protection pipe around the wire passing through the hollow part of the wall to prevent damage by a mouse.

7 Checking procedure after installation

1. Confirm the smooth water flowing from the drain hose by pouring some water into the evaporator pan.
2. Arrange the wall penetration presentably with the bushing for refrigerating pipes and sealer belonging to the pipe set, as shown in Fig. 7-1.
3. Wind the inadhesive vinyl tape belonging to the pipe set around the refrigerating pipes and the connecting cord.
4. Leakage check of refrigerant at the coupling by gas leak detector or soapsuds, as shown in Fig. 7-2.
5. Check evaporator coldness (cooling operation).
6. Check warm wind from the condenser (cooling operation).

Diagram Description: Fig. 7-1 shows wall penetration with bushing for pipes and sealer. Fig. 7-2 shows refrigerant leakage checking using soapsuds.

8 Installation of wired remote controller (optional)

1. Connection to the electrical box: Remove the cover of the electric box. Connect the connector of the wired remote controller to CN1102. Assemble back the cover of the electrical box.
2. Wiring installation for wired remote controller (2 methods): The wired remote controller casing can be opened by pressing the slots with a minus screwdriver.

Diagram Description: Illustrates opening the wired remote controller casing and wiring installation methods.

Decide the fixing location of the remote controller so that the length of the wire shall be within 5 meters.

A CAUTION: Do not cut the provided wire. Excess wire should be properly wound and fitted in a safe place. Do not join the wire with additional wire.

Diagram Description: Shows wall recessed wiring installation and alternative inside top wiring installation for the remote controller.

How To Connect The Optional Parts

(RAC / WiFi Adapter, Wired Remote Control, ON/OFF Status or Alarm Signal, Motion Sensor)

EXTERNAL COMMUNICATION [For all optional parts, please refer to the catalog for part numbers]

When connecting the Dry contact / External Communication / WiFi / ON/OFF Status or Alarm Signal / Motion Sensor (Optional):

• To connect to Dry Contact, a separate purchase HA adaptor and Dry Contact Connecting Cord is required.
• To connect to External Communication, a separate purchase RAC adaptor is required.
• To connect to WiFi, a separate purchase WiFi adaptor is required.
• To install the wiring, the electrical box cover must be opened. (For Dry Contact, connect to CN9; for WiFi Adaptor or RAC Adaptor, connect to CN1101; for ON/OFF Status or Alarm Signal, connect to CN25; for Motion Sensor, connect to CN10)
• The connection cord and power cables are to be arranged and tied up as shown in the diagram.
• Please refer to the respective user manuals of the WiFi adaptor and RAC adaptor for further details.
• Please refer to the user manual for instructions on the removal and installation of the electrical box.
• For ordering all optional parts, please refer to the catalogue for part number.
• For Multi Air Conditioner, please refer to the Outdoor Service Manual.

WIRED REMOTE CONTROLLER [For all optional parts, please refer to catalog for part number]

• To connect to the electrical box: Remove the cover of the electrical box. Connect the connector of the wired remote controller to CN1102. Assemble back the cover of the electrical box.
• Please refer to the respective user manual of the wired remote controller for further details.
• Please be careful not to damage lead wires by the edge of the plate when connecting the optional parts.

10 Setting of external static-pressure switch

Setting of External Pressure: Remove the lid of the electric box and set the "STATIC PRESSURE" switch.

• HIGH: 150pa
• MEDIUM: 100pa
• NORMAL: 50pa

If not set to HIGH STATIC-PRESSURE, there will be a reduction of cooling and heating capacities.

(At the time of delivery, the switch is set as "NORMAL".)

Diagram Description: Shows the external static-pressure switch with settings for HIGH, MEDIUM, and NORMAL pressure levels.

12 Protection of lead wire

Wrap aluminum tape around the PVC tube between the electric box and the indoor unit (cord band).

13 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.

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

CONNECTION OF CONNECTING CORD

A WARNING THIS APPLIANCE MUST BE EARTHED. ?

Procedures of Wiring

Wiring Of The Indoor Unit

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

Diagram Description: Shows wiring connections between the Indoor Unit and Outdoor Unit, including power cord and connecting cord terminals (L, N, Earth).

Insert and fix the connecting cords with screws.

• 1.5mm² Connecting cord
• 2.5mm² Power cord
• AC 220~240V 50/60Hz
• Connect the earth screw (green and yellow wire)

Detail of Cutting the Connecting Cord

Diagram Description: Illustrates the correct lengths for stripping wires on the connecting cord and power line, including specific lengths for the ground wire.

• Connecting cord (Indoor Unit): 40 mm total, 10mm strip.
• Connecting cord (Outdoor Unit): 80 mm total, 10mm strip.
• Power line: 50 mm total, 10mm strip.
• Green + Yellow (ground): 70mm total, 10mm strip.

A WARNING

• The naked part of the wire core should be 10 mm and fixed tightly to the terminal. Then, try to pull each wire to check if the contact is tight. Improper insertion may burn the terminal.
• Be sure to use only power cables approved by 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 connection in the middle of the connecting cable. It may cause the wire to overheat, emit smoke, and catch fire.

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

FINAL STAGE OF INSTALLATION

Section 1: Insulation And Maintenance Of Pipe Connection

• The connected terminals should be completely sealed with a heat insulator and then tied up with a rubber strap.
• Tie the pipe and power line together with vinyl tape as shown in the figure, and then fix their position with holders.
• To enhance heat insulation and prevent water condensation, cover the outdoor part of the drain hose and pipe with insulation pipe.
• Completely seal any gap with putty.

Diagram Description: Shows the sleeve of protection pipe and putty used for sealing pipe connections.

Section 2: Power Source And Operation

Power Source

A CAUTION

• Please use a new socket. An accident may occur while using an old socket due to poor contact.
• Please plug in and then remove the plug for 2-3 times to ensure it 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 a U-shaped nail.

WARNING

• Do not use means to accelerate the defrosting process or to clean, other than those recommended by the manufacturer. Any unfit method or use of incompatible material may cause product damage, burst, and serious injury.
• The appliance/pipe-work shall be stored in a well-ventilated room with an indoor floor area larger than Amin [refer to Table 1] and without any continuously operating ignition source. Keep away from open flames, any operating gas appliances, or any operating electric heater. Otherwise, it may explode and cause injury or death.
• The appliance/pipe-work shall be installed and/or operated in a room with a floor area larger than Amin [refer to Table 1] and kept away from 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/pipe-work is pressurized. Do not expose the appliance/pipe-work to heat, flame, sparks, or other sources of ignition. Otherwise, it may explode and cause injury or death.