HITACHI RAC-18WPE Outdoor Unit Instruction Manual

HITACHI RAC-18WPE Outdoor Unit Instruction Manual

SAFETY PRECAUTIONS

Read the safety precautions carefully before operating the unit.
This device is filled with R32.
The contents of this section are important to ensure safety. Please pay special attention to the following signs.
WARNING ………. Incorrect installation methods can result in death or serious injury.
BEWARE ………. Improper installation can have serious consequences.
Make sure to connect the ground line.
This sign in the figure shows the ban.
Make sure the unit is working properly after installation. Explain to the customer the proper operation and maintenance of the unit as described in the user guide. Ask the customer to order this installation manual together with the instruction manual.

WARNING

• Please ask a sales agent or qualified technician to install your unit. Water leakage, short circuit or fire may occur if you do the installation yourself.

• Please refer to the installation manual during the installation process. Improper installation may cause water leakage, electric shock and fire.

• • Observe the rules and regulations of electrical installation and the methods described in the installation manual when handling electrical work. Use a cable officially approved in your country. Make sure to use the specified circuit. Short circuits and fires can occur due to the use of poor quality cables or incorrect work.

• Be sure to use the specified cable to connect the indoor and outdoor units. Please ensure that the connection is tight after the cable conductor is inserted into the terminal to prevent external force from being applied to the connection part of the terminal base. Improper insertion and loose contact can cause heat and fire.

• Please use the specified components for installation work. Otherwise, the unit may collapse or leak water, electric shock, fire or
  strong vibration may occur.

• • When installing or transferring the air conditioner to another location, make sure that air other than the specified refrigerant (R32)
    does not enter the refrigeration cycle. If more air has to enter, the pressure level in the cooling cycle can rise abnormally which can cause rupture and injury.

• Make sure to ventilate fully if refrigerant gas leaks during work. If the refrigerant gas is exposed to fire, it may contain toxic gas.

• After completing the installation work, check that there are no gas leaks in the refrigerator. If the refrigerant gas leaks into the room, comes into contact with the fire in the fan heater, space heater, etc., toxic gas can occur.

• Unauthorized AC modifications can be dangerous. In the event of a breakdown, contact a qualified AC technician or electrician. Improper repair may cause water leakage, electric shock and fire, etc.

•  Be sure to connect the ground line from the power cord to the outdoor unit and between the outdoor and indoor units. Do not connect the earth line to gas cylinders, water pipes, light poles or telephone unit earth lines. Improper grounding can cause electric shock.

• When completing the refrigerant collection (pumping down), stop the compressor and remove the coolant pipe.

• If you disconnect the refrigerant pipe while the compressor is running and the service valve is released, air is sucked in and the pressure in the freezing cycle system will build up rapidly, 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 in and the pressure level of the refrigeration cycle can increase abnormally which can cause rupture and injury.

• Electrical wiring must not be reworked or added. Make sure to use an exclusive circuit breaker.

• Otherwise, fire or electric shock may occur due to connection failure, isolation failure or overcurrent.

• Make sure you connect the wires to the terminals correctly and the terminal cover must be firmly closed.

• Otherwise, through heat in the terminal contacts, fire or electric shock may occur.

• Make sure there is no dust at any point where the power cord is connected and fix it firmly.

• Otherwise, fire or electric shock may occur.

• Please install the Outdoor unit from a stable ground to prevent vibration and increase the noise level.

• Determine the location for the pipes after sorting through the different types of pipes available.

• When removing the side cover, please pull the handle after undoing the hook by pulling down. Reinstall the side cover in the reverse order of removal.
  

Caution

Do not touch the suction port, bottom surface, or aluminum fins of the outdoor unit. Otherwise, it may cause injury.

OUTDOOR UNIT CONDENSATION WATER DISPOSAL

• There is a hole in the base of the Outdoor unit for condensed water to exhaust.

• To drain the condensed water into the drain, the unit is mounted on a board or block so that the unit is 100mm above the ground as shown in the figure. Connect the drain pipe to one hole.

• After installation, make sure that the drain pipe is firmly attached to the base.
  

• Install the outdoor unit horizontally and check that the condensate has disappeared.

• If it is used in a particularly cold area, if there is a lot of snow with extreme cold in the cold area, the condensed water will freeze at the base and may not drain. In this case, remove the bushing and drain pipe at the bottom of the unit. (Left and center near the discharge part of the air, each 1 place). Make sure that the distance from the drain hole to the ground is 250 mm or more.

Be careful

• A circuit breaker must be installed in the house distribution box for the power supply cable connected directly to the outdoor unit. In the case of other installations, a main switch with a contact gap of 3mm or more must be installed.
• Without a circuit breaker, an electric shock hazard exists.
• Do not install the unit near flammable gas.
• The outdoor unit may catch fire if flammable gas leaks around it.
• Make sure that the water flow is smooth when installing the drain hose. Improper installation can damage your furniture.
• IEC approved power cords must be used. Power cable type: NYM.

SELECTION OF MOUNTING SITE
(Remember the following points and obtain permission from the customer before installation.)

WARNING
The Outdoor Unit must be installed in a location that can support heavy weight. Otherwise, noise and vibration will increase.

Be careful

• Choosing an installation location: A suitable location that will reduce the impact of rain and direct sunlight that can affect the performance of the unit.
• In addition, ventilation should be good and unobstructed.
• The air blown out of the unit should not be directed directly at animals or plants. The clearance of the unit from the top, left, right and front is determined in the figure below. At least the top three sides should be open to the air.
• Make sure that the hot air coming out of the unit and the noise do not disturb the environment.
• Do not install in a place where there is flammable gas, steam, oil and smoke. The place should be suitable for drainage.
• Place the Outdoor unit and connecting cables at least 1 m away from antennas or television, radio or telephone signal channels. This is to prevent interference.

The picture shows the Installation of the Outdoor Unit.

For outdoor unit installation, allow at least 2 sides of space around the unit to ensure ventilation.

About the outdoor unit:

• When “Stop” is selected during indoor unit operation, the outdoor unit fan continues to rotate for 10 to 60 seconds to cool the electric part.
• In heating operation, condensate or water due to defrosting will flow. Do not cover the drain port on the outdoor unit as the water may freeze in cold areas.
• When the outdoor unit is suspended from the ceiling, install the bush and drain pipes in the drain and water drain ports.

installation

Preparation of Pipes

Use a pipe cutter to cut the copper pipe and remove the burr.

Before flaring, please put on the flare nut.

Be careful

• Remove burrs and jagged edges will cause leaks.
• The side point to be cut down when trimming to prevent copper chips from entering the pipe.

Pipe Connection

Be careful

• In the case of removing the flare nut from the indoor unit, first remove the nut from the small diameter side, or the seal cover from the large diameter side will fly out. Free from water into the pipe during use.
• Be sure to tighten the flare nut to the specified torque with a torque wrench. If the flare nut is too tight, the nut may split after a long time, and may cause refrigerant leakage.
• Be careful when bending copper pipes.
• Shut down manually when centering. After that, use a torque wrench to tighten the connection.

| Pipe outer diameter (ø)| Torque N·m (kgf·cm)
---|---|---
Small diameter side| 6.35 (1/4″)| 13.7-18.6 (140 – 190)
Large diameter side| 9.52 (3/8″)| 34.3-44.1 (350 – 450)
12.7 (1/2″)| 44.1-53.9 (450 – 550)
Cover the valve head| 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)
Close the valve core| 12.3-15.7 (125 – 160)

Remove Air From Pipes And Check For Gas Leaks

Procedures for using a Vacuum Pump to Remove Air

1. As shown in the right picture, remove the valve core cover. Then, connect the charging hose. Remove the valve head cover. Connect the vacuum pump adapter to the vacuum pump and connect the charging hose to the adapter.
2. Tighten the “Hi” shuttle of the manifold valve and remove the “Lo” shuttle. Open the vacuum pump for about 10-15 minutes, then finish tightening the shuttle “Lo” and turn off the vacuum pump.
   •  Loosen the small diameter service valve spindle by 1/4 turn and tighten the spindle immediately after 5 to 6 seconds.
   • Disconnect the charging hose from the service valve.
3. Finish opening the service valve spindle (in 2 places) in an anticlockwise direction to allow the flow of refrigerant (using the Hexagonal Wrench key).
4. Tighten the valve head cover. Check the edge of the cap for gas leaks. The task is then completed.

Gas leak inspection
Please use a gas leak detector to check if there is a leak when connecting the Flare nut as shown on the right.
If there is a gas leak, tighten the connection to stop  the leakage.

WARNING
THIS APPLICATION MUST BE AVAILABLE.

Wiring Procedures

Connection Cable Cutting Details

WARNING

• The bare side of the cable core must be 10mm fixed to the terminal tightly. Then try pulling individual wires to check if the contacts are tight. Improper insertion may burn the terminal.
• Make sure you only use cables that have been specified for AC use.
• Refer to the manual for cable connections and cable techniques must meet electrical installation standards.
• There is an AC voltage drop between the LN terminals when the power is on. Therefore, be sure to remove the plug from the socket.
• When the fuse (F5 or F6) has been blown by incorrect power cable connection, it can be restored by replacing the fuse (service part No.HWRAC-50NX2 A52). Please replace the blown fuse after making sure the connection is correct.
• Leave some space in the connection cable for maintenance purposes and be sure to secure it with cable tape.
• Secure the connecting cables along the coated cable sections using cable ties. Do not force the cable as it may cause overheating or fire.

Wiring of the Outdoor Unit
Please remove the side cover for the cable connection.

WARNING

• If you can’t attach the side plate because of the connecting cable, please press the connecting cable to the front panel to fix it.
• Make sure that the hooks of the side cover stay in place. Otherwise, water leakage may occur and cause a short circuit or error.
• Connection cables should not touch service valves and pipes. (so the temperature is high in the heating operation.)

Check the power supply and voltage range
Before installation, the power supply must be checked and the necessary wiring work must be completed.
To establish proper wiring capacity, use the following list of wire gauges for wiring from the house distribution fuse box to the outdoor unit taking into account the blocked rotor current.

• Investigate power supply capacity and other electrical conditions at the installation location. Depending on the model of the room air conditioner to be installed, ask the customer to make arrangements for the necessary electrical work etc. electrical work including wiring up the outdoor unit. In areas where electrical conditions are poor, the use of regulated voltage is recommended.
• Install the air conditioner in the room within the reach of the cable line.

Said

Fuse Capacity

RAC-18/25/35WPE| 15A time delay fuse
RAC-42/50WPE| 25A time delay fuse
Cable length| Wire cross-section
---|---
up to 6m to 15m to 20m| 1.5mm 2 2.5mm 2 4.0mm 2

Resources and Operational Tests

Power Source
WARNING

• Do not modify the power plug or extend the cable long distances.
• Keep the extra length for the power cable and do not make the plug on the external force because it can cause a bad contact.
• Do not fix the power cord with U-shaped nails.
• Power cords generate heat easily. Do not carry cables together with cables or vinyl ties.

Test operation

• Please make sure the air conditioner is in normal operating condition during test operation.
• Explain to the customer the proper operating procedures as described in the user manual.
• If the indoor unit does not work, check the wiring for proper connection.
• Turn on the lamp in the room where the indoor unit is installed and check the remote control for normal operation.

Refrigerant information

Read More About This Manual & Download PDF:

Read User Manual Online (PDF format)

Read User Manual Online (PDF format)  >>

Download This Manual (PDF format)

Download this manual  >>