Hitachi airHome MultiPro RAM-G55N2HBE Split Unit Air Conditioner

Safety Precautions

WARNING: Incorrect methods of installation may cause death or serious injury.

CAUTION: Improper installation may result in serious consequence.

Read the safety precautions carefully before operating the unit. Special attention should be paid to the following signs:

• WARNING: Indicates potential for death or serious injury.
• CAUTION: Indicates potential for serious consequences.

General Safety Guidelines

• A circuit breaker or fuse must be installed.
• An external switch with a contact separation of at least 3mm must disconnect all poles from the power supply.
• Do not install near flammable gas.
• Do not install in kitchens or machine shops where oil vapor is present, as it can damage the unit.
• Ensure smooth water flow for the drain hose.
• Piping must be supported with maximum spacing of 1m between supports.
• Do not use methods other than those recommended by the manufacturer for defrosting or cleaning.
• The appliance/pipe-work must be stored and operated in well-ventilated rooms with adequate floor area and no ignition sources. Keep away from open flames, gas appliances, or electric heaters to prevent explosion.
• Do not pierce or burn the pressurized appliance/pipe-work. Do not expose to heat, flame, sparks, or other ignition sources.

Outdoor Unit Installation Location

• Keep adequate space around the unit for maintenance and ventilation.
• Northern or eastern sides of buildings are preferable. Blinds may be used on southern or western sides but must not obstruct ventilation.
• Avoid placing the unit in dirty or wet locations.
• Place as near as possible to the indoor unit.
• Install on a stable place to minimize vibration and noise.
• Secure cords and pipes after arranging them.

Electrical Safety

• This appliance must be earthed.
• Power is supplied through the outdoor unit; do not connect the power source to the indoor unit.
• A separator with a contact gap of more than 3mm must be installed for cleaning or service.

Tools Needed For Installation Work

WARNING:

• Carefully read installation procedures before starting.
• Sales agents should inform customers about correct operation.

Tools required (^* indicates tool exclusive use for R32):

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

Important Warnings Regarding Piping and Installation

• Use a torque wrench for flare nuts and tighten to specified torque to prevent gas leakage, stagnation, or ignition.
• Use a polyethylene rod for sharp pipe bends to avoid crushing, which can cause gas leakage.
• Request installation from a sales agent or qualified technician to avoid water leakage, short circuits, or fires.
• Follow installation manual instructions to prevent water leakage, electric shock, and fire.
• Connections (brazed, welded, mechanical) must be made before opening valves for refrigerant flow. A vacuum valve is required for evacuation.
• Mechanical connectors used indoors must comply with ISO 14903; renew sealing parts and re-fabricate flare parts if reused.
• Refrigerant tubing must be protected from damage.
• Ensure units are mounted securely to prevent collapse.
• Follow electrical installation rules and use approved power cables.
• Use specified wire for connecting indoor and outdoor units and ensure tight connections to prevent overheating and fire.
• Use specified components to prevent unit collapse, water leakage, electric shock, or fire.
• Use specified piping sets for R32 to avoid pipe breakage or faults.
• Only use specified refrigerant (R32) and prevent air or moisture in the refrigeration cycle to avoid high pressure and rupture.
• Ventilate fully if refrigerant gas leaks; contact with fire can produce poisonous gas. Refrigerants may be odorless.
• After installation, check for refrigerant gas leaks. Leaks can produce poisonous gas if in contact with fire sources.
• Unauthorized modifications are dangerous; call a qualified technician for repairs.

The Choice of Mounting Site

WARNING:

• The outdoor unit must be mounted in a location that can support its weight to prevent increased noise and vibration.

CAUTION:

• Do not expose the unit to direct sunshine or rain; ensure good, unobstructed ventilation.
• The air blown from the unit should not directly target animals or plants.
• Observe specified clearances from the top, left, right, and front. At least three sides must have open air.
• Ensure hot air and noise do not disturb the neighborhood.
• Do not install where flammable gas, steam, oil, or smoke is present.
• The location must be convenient for water drainage.
• Place the outdoor unit and its connecting cord at least 1m away from TV, radio, or telephone antennas/signal lines to avoid interference.
• Do not install the outdoor unit facing strong wind direction, as it may damage the fan motor.
• Do not install where small animals might build nests, as they could cause unit failure, smoke, or fire by touching electrical parts. Keep the surrounding area clean.

Outdoor Unit Clearances and Dimensions

A diagram illustrates the required clearances around the outdoor unit for proper ventilation. Specific dimensions for the mounting stand are also provided.

Diagram Description: Outdoor Unit Clearances

The diagram shows recommended clearances: 100mm from the bottom, 300mm from the sides (with at least 3 sides open to air), and 400mm from the front. It also indicates that pipes should not be bent sharply.

Diagram Description: Dimension of Mounting Stand

This diagram details the dimensions for the outdoor unit's mounting stand, including measurements for height and width.

Diagram Description: Names of Outdoor Components

A table lists components such as Bush (Qty 1) and Drain Pipe (Qty 1) associated with the outdoor unit's mounting stand.

Piping and Height Difference Specifications

• The unit is chargeless up to 35m pipe length.
• Installation of pipe length less than the minimum requirement (3 meters) may generate abnormal sound.
• The difference in height between the indoor and outdoor units should not exceed 20m.
• Connecting pipes (both large and small diameter) must be insulated with insulation pipe and then wrapped with vinyl tape to prevent insulator deterioration.
• A diagram shows the connection of an insulated drain hose, recommending the use of a commercial insulated drain hose for indoor piping and enclosed insulation pipe for the pipes themselves. Gaps should be sealed with putty.
• Height difference between indoor units should not be more than 5m.
• Maximum total pipe length (L1 + L2) is 35m.
• Minimum piping length for each indoor unit is 3m.
• Maximum piping length for one indoor unit is 25m.
• Additional refrigerant charge is not required for these lengths.
• The unit supports connection of up to two indoor units, provided the total capacity does not exceed 8.5 kW.
• Specific pipe sizes are listed: 6.35mm (1/4"), 9.52mm (3/8"), 12.7mm (1/2").
• Optional flare adaptors are necessary for 4.2kW, 5.0kW, and 6.0kW units.

Diagram Description: Flare Adaptor for Piping

This section describes the need for a flare adaptor (Part number TA261D-4 001) for specific indoor unit combinations, showing the size conversion from ⌀9.52mm (3/8") to ⌀12.7mm (1/2").

Symbols Explanation:

• ?: This symbol indicates the equipment uses a flammable refrigerant (R32). If refrigerant leaks and an ignition source is present, there is a possibility of ignition.
• ?: This symbol indicates that Operation Instructions should be read carefully.
• ?️: This symbol indicates that service personnel should handle this equipment with reference to the Installation Manual.
• ℹ️: This symbol indicates that there is information included in the Operation Manual and/or Installation Manual.

WARNING: BURST HAZARD - Do not allow air, etc., to get into the refrigerant cycle (piping).

RISK OF EXPLOSION: Compressor must be stopped before removing refrigerant pipes. All service valves must be fully closed after pumping down operation.

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

WARNING: Flare connection only at outside of building.

Installation of Refrigerating Pipes and Air Removal

Mounting and Preparation

• Mount the outdoor unit on stable ground to prevent vibration and noise.
• Decide piping location after sorting pipe types.
• To remove the side cover, pull the handle after undoing the hook by pulling it downward.
• Face the suction side of the unit towards the wall.
• Remove the side cover for connecting piping and the connecting cord.

Condensed Water Disposal of Outdoor Unit

• The outdoor unit base has holes for condensed water exhaust.
• The unit should be installed on a stand or block, 100mm above the ground, to allow condensed water to flow to the drain. Join the drain pipe to one hole.
• Secure the drain pipe by inserting its hook into the base (Portion A) and pulling it in the indicated direction. Check for firm attachment.

Installation in Cold Areas

• In low temperatures and snowy conditions, water may freeze on the base, causing poor drainage.
• For cold areas, do not install bushings and keep a minimum of 250mm between the drain hole and the ground. Consult your sales agent for details on using the drain pipe and refer to the Installation Manual for Cold Areas.

Pipe Preparation

• Use a pipe cutter to cut the copper pipe.
• CAUTION: Jagged edges can cause leakage. Point the trimmed side downwards to prevent copper chips from entering the pipe.
• Before flaring, slide the flare nut onto the pipe.

Diagram Description: Pipe Cutting and Flaring

Illustrates using a pipe cutter and trimming tool on copper pipe. It also shows the process of sliding the flare nut onto the pipe before flaring and recommends using R32 flaring tools, detailing specifications for clutch-type and wing nut type tools for various pipe diameters.

Pipe Connection

• CAUTION: When removing a flare nut from an indoor unit, remove the nut on the small diameter side first. Prevent water from entering the piping during work.

Diagram Description: Pipe Connection and Torque Specifications

Shows the connection of pipes using flare nuts and torque wrenches. It lists torque specifications (N·m and kgf·cm) for different pipe outer diameters (6.35mm, 9.52mm, 12.7mm, 15.87mm) for both small and large diameter sides of the connection, including valve core caps and valve heads.

Removal of Air from the Pipe and Gas Leakage Inspection

AIR REMOVAL

Procedures of using Vacuum Pump for Air Removal

1. Remove the cap of the valve core and valve head. Connect the charge hose to the vacuum pump adapter and then to the vacuum pump.
2. Fully tighten the "Hi" knob of the manifold valve and completely unscrew the "Lo" knob.
3. Run the vacuum pump for 10-15 minutes until the meter reaches -101KPa (-76cmHg). Fully tighten the shuttle valve and switch off the vacuum pump.
4. Remove the charge hose and tighten the cap of the valve core. Check for gas leakage around the cap.
5. Completely unscrew the spindle of the service valve counter-clockwise to allow refrigerant flow.
6. Re-cap the service valve, tighten with a wrench, and check for gas leakage around the cap.

CAUTION:

• Prevent moisture from entering pipe connections.
• Do not apply refrigerating machine oil to the outside of the flare, as it can lead to excessive tightening, cracking, destruction of the flare, and gas leakage.
• When using control valves, do not use deteriorated packing and do not overtighten the steering wheel to prevent gas leakage and ignition.

Gas Leakage Inspection:

• Use a gas leakage detector to check flare nut connections. If leakage occurs, further tighten the connection. Ensure the detector is suitable for R32.

Diagram Description: Vacuum Pump Air Removal Setup

Illustrates the setup for air removal using a vacuum pump, manifold valve, charge hose, and vacuum pump adapter. It shows the connection points and the meter indicating pressure.

Connection of Power Cord

Procedures of Wiring

1. Installation Procedure and Notice: Select installation place carefully as it's difficult to move the unit later.
2. Wiring: Connect electrical wiring between indoor and outdoor units as shown in Fig. 1-1. Incorrect connection can cause malfunction. Fix the connecting cord with the band near the terminal board.
3. Connection of the connecting cords and power cord: Cut and strip wires as shown in Fig. 1-2. Connect cords to the terminal board (Fig. 1-3) and fix them with a steel band.

Diagram Description: Wiring Diagrams and Cord Preparation

Fig. 1-1: Shows indoor-outdoor unit wiring and methods for indoor earth wire connection to the outdoor unit (Separate and Combine methods).

Fig. 1-2: Illustrates the detail of cutting the connecting cord and stripping wire insulation.

Fig. 1-3: Shows the connection of connecting cords and power cord to the terminal board and how to secure them with bands.

Electrical Safety Warnings

• WARNING: Leave space in the connecting cord for maintenance and secure it with a cord band. Secure the cord along the coated part; do not exert pressure on the wire to prevent overheating or fire.
• WARNING: The naked part of the wire core should be 10mm and fixed tightly. Check the contact. Improper insertion may burn the terminal. Use only specified wire for air conditioners. Wiring techniques must meet electrical installation standards. There is an AC voltage drop between L and N terminals when power is on; remove the plug from its socket.

Wiring of The Outdoor Unit

• Remove the side cover for wire connection.
• WARNING: If the side cover cannot be attached due to the connecting cord, press the cord towards the front panel. Ensure side cover hooks are securely fastened to prevent water leakage and short circuits. The connecting cord should not touch the service valve and pipes, as they become hot during heating operation.

Checking for the Electric Source and the Voltage Range

• Before installation, check the power source and complete necessary wiring. Use appropriate wire gauges for wiring from the transformer and switchboard, considering locked rotor current.
• Investigate power supply capacity and electrical conditions at the installation location. Request necessary electrical work from the customer.
• In areas with poor electrical conditions, using a voltage regulator is recommended.
• WARNING: THIS APPLIANCE MUST BE EARTHED.

IMPORTANT:

• Power cord (L, N, Earth): Requires 3 Core cable with 2.5mm² wire cross-section.
• Connecting cord (1, 2, 3, Earth): Requires 4 Core cable with 1.5mm² wire cross-section, up to 25m cable length.

Diagram Description: Grounding and Wiring Details

Shows optional grounding rod (SP-EB-2, 900mm length) and earth line connection. Also indicates a 16A circuit breaker and the need to arrange power cords to avoid touching the service valve.

CAUTION: Outdoor supply cords shall not be lighter than polychloroprene sheathed flexible cord with code designation 60245 IEC 57.

Final Stage of Installation

Insulation And Maintenance Of Pipe Connection

• Seal connected terminals completely with heat insulator and tie with a rubber strap.
• Tie the pipe and power line together with vinyl tape and fix their position with holders.
• Cover the outdoor part of the drain hose and pipe with insulation pipe to enhance heat insulation and prevent water condensation.
• Completely seal any gaps with putty.

Diagram Description: Insulation of Pipe Connections

Illustrates the process of insulating pipe connections using insulation material, sleeve of protection pipe, and putty to seal gaps.

Power Source And Operation Test

Power Source

• WARNING: Never remodel the power plug or extend the long-distance cord. Ensure adequate length for the power cord and avoid external force on the plug to prevent poor contact. Do not fix the power cord with a U-shape nail. The power cable generates heat; do not bundle it with wires or vinyl ties.

Operation Test

• CAUTION: Do not operate for over 5 minutes with the service valve spindle closed, as this will cause defects. Do not operate in Cool or Dry Mode with doors/windows open for extended periods, as condensation may drip and damage furniture. Explain proper operation procedures to the customer. If the indoor unit does not operate, check cable connections. Turn on room lights and check remote controller operation.
• Test Steps:
  1. Operate in Cool Mode (summer) or Heat Mode (winter).
  2. Set the desired temperature to 16.0°C for Cool Mode or 32.0°C for Heating Mode using the remote controller.
  3. Set the desired fan speed to "High".
  4. Operate the air conditioner for at least 20 minutes and confirm cool or warm air output.
  5. Press the ON/Off button on the remote controller to ensure the unit stops running.
• Troubleshooting Blinking Lamps: If indoor unit indication lamps blink with a buzzer, check the following:
  • Indication lamps blink three times repeatedly: Ensure both service valve spindles are open. (The outdoor fan may operate for up to 15 minutes after operation stops for protection; wait for the fan to stop before reoperation.)
• Resetting Power Supply: Before checking or reoperating, reset the power supply by turning the circuit breaker off and on after at least 5 minutes, or by pressing the Temporary Switch Button once while the power is OFF.
• CAUTION: Trial runs should be conducted on one unit at a time to check for incorrect wiring.
• Pre-operation Check: Measure the supply voltage before the operation test. Ensure the air conditioner is in normal operating condition during the test.