HITACHI RAC-18WPE Heat Pump Outdoor Unit Air Conditioner Instruction Manual

HITACHI RAC-18WPE Heat Pump Outdoor Unit Air Conditioner

SAFETY PRECAUTION

Read the safety precautions carefully before operating the unit.
This appliance is filled with R32.
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 operation and maintenance of the unit as described in the user’ s guide. Ask a customer to keep this installation manual together with the instruction manual.

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 installation 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 cables which are approved official in your country. Be sure to use the specified circuit. A short circuit and fire may occur due to the use of low quality wire or improper work.

• Be sure to use the specified cables 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 to prevent the external force is being applied to the connection section of the terminal base. 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, fire or
  stronger vibration may occur.

• Be sure to use the specified piping set for R410A,R32. Otherwise, this may result in broken copper pipes or faults.

• When installing or transferring an air conditioner to another location, make sure that air other than the specified refrigerant (R32)
  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 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. Do not connect the earth line to the gas tube, water pipe, lighting rod or the earth line of the telephone unit. Improper earthing may cause electric shocks.

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

• If you remove the refrigerant pipe while the compressor is operating and the service valve is released, air is sucked and a pressure in the freezing cycle system will build up steeply, 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 and the pressure level of the refrigeration cycle may increase abnormally which could result in a rupture and injury.

• The electric cables should neither be reworked nor added. Make sure to use an exclusive circuit breaker.

• Otherwise fire or electric shock might occur by connection failure, isolation failure or over current.

• Make sure to connect cables to terminal properly and terminal cover should close firmly.

• Otherwise, over heating at terminal contact, fire or electric shock might occur.

• Make sure that there is no dust on any connected points of electric cables and fix firmly.

• Otherwise, fire or electric shock might occur.

• Please mount the Outdoor unit of stable ground to prevent vibration and increase of noise level.

• Decide the location for piping after sorting out the different types of pipe available.

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

CAUTION
Do not touch the suction port, bottom surface,or aluminum fin of the outdoor unit.Failure to do so may cause an injury.

CONDENSED WATER DISPOSAL OF OUTDOOR UNIT

• There is holes on the base of Outdoor unit for condensed water to exhaust.
• In order to flow condensed water to the drain, the unit is installed on a stand or a block so that the unit is 100mm above the ground as shown figure. Join the drain pipe to one hole.
• After installation, check whether the drain pipe clings to the base firmly.

• Install the outdoor unit horizontally and make sure that condensate drains away.
• In case of using in chilly area specially, in case that there are many snows by very cold in chilly area, condensed water freezes on the base and may result not to drain. In this case, please remove the bush and the drain pipe at the bottom of unit. ( Left and center near discharge portion of air, each 1 place).It becomes smooth drain. Ensure that the distance from the drain hole to the ground is 250 mm or more.

CAUTION

• A circuit breaker must be installed in the house distribution box for the direct connected power supply cables 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.
• Please ensure smooth flow of water when installing the drain hose. Improper installing may wet your furniture.
• 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 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,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 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 connecting cord at least 1 m away from the antenna or signal line of television, radio or telephone. This is to avoid noise interference.

Figure showing the Installation of Outdoor Unit.

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

About the outdoor unit:

• When “Stop” is selected during operation of the indoor unit, the fan of the outdoor unit continues turning for 10 to 60 seconds to cool the electric parts down.
• In heating operation, condensate or water due to defrosting will flow. Do not cover the drain port of the outdoor unit because such water may freeze in the chilly area.
• When the outdoor unit is hung on the ceiling, install the bush and drain pipe on the drain port and drain water.

Installation

Preparation of Pipe

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

Before flaring, please put on the flare nut.

CAUTION

• Remove burr and jagged edge will cause leakage.
• Point the side to be trimmed downwards during trimming to prevent copper chips from entering the pipe.

Outer

Diameter (Ø)

| A (mm) Rigid Flaring Tool
---|---
For R410A,R32 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

CAUTION

• In case of removing flare nut of a indoor unit, first remove a nut of small diameter side, or a seal cap of big diameter side will fly out. Free from water into the piping when working.
• Be sure to tighten the flare nut to the specified torque with a torque wrench. If the flare nut is overtightened, the nut may be split after a long period has passed, and may cause a refrigerant leak.
• 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.

Remove of Air From The Pipe And Gas Leakage Inspection

Procedures of using Vacuum Pump for Air Removal

1. As shown in right figure, remove the cap of valve core. Then, connect the charge hose. Remove the cap of valve head. Connect the vacuum pump adapter to the vacuum pump and connect the charge hose to the adapter.
2. Fully tighter the “Hi” shuttle of the manifold valve and completely unscrew the “Lo” shuttle. Run the vacuum pump for about 10-15 minutes, then completely tighten the “Lo” shuttle and switch off the vacuum pump.
   •  Loosen the spindle of the service valve with small diameter by 1/4 turn and tighten the spindle immediately after 5 to 6 seconds.
   • Remove the charging hose from the service valve.
3. Completely unscrew the spindle of the service valve (at 2 places) in anticlockwise direction to allow the flow of refrigerant (using Hexagonal Wrench key).
4. Tighten the cap of valve head. Check the cap’s periphery if there is any gas leakage. The task is then completed.

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. WARNING
THIS APPLIANCE MUST BE EARTHED.

Procedures of Wiring

Detail of Cutting the Connecting Cord

WARNING

• The naked part of the wire core should be 10mm 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.
• Be sure to use only wire specified for the use of air-conditioner.
• 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.
• When the fuse (F5 or F6) has been blown out by the improper connection of power cable, it can be restored by exchanging the fuse (service part No.HWRAC-50NX2 A52). Please exchange the blown-out fuse after making sure the right connection.
• 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.

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

WARNING

• If you cannot attach the side plate due to the connection cord, please press the connecting cord in the direction to the front panel to fix it.
• Be sure that the hooks of the side cover fixed in certainly. Otherwise water leakage may occur and this causes short circuit or faults.
• The connecting cord should not touch to service valve and pipes. (it becomes high temperature in heating operation.)

Checking for the electric source and the voltage range
Before installation, the power source must be checked and necessary wiring work must be completed.
To make the wiring capacity proper, use the wire gauge list below for the wiring from house distribution fuse box to the outdoor unit in consideration of the blocked rotor current.

• Investigate the power supply capacity and other electrical conditions at the installing location. Depending on the model of room air conditioner to be installed, request the customer to make arrangements for the necessary electrical work etc. The electrical work includes the wiring work up the outdoor unit. In localities where electrical conditions are poor, use of a voltage regulation is recommended.
• Install outdoor for the room air conditioner within the reaching range of the line cord.

IMPORTANT

Fuse Capacity

RAC-18/25/35WPE| 15A time delay fuse
RAC-42/50WPE| 25A time delay fuse
Wire length| Wire cross-section
---|---
up to 6m up to 15m up to 20m| 1.5mm2 2.5mm2 4.0mm2

Power Source And Operation Test

Power Source
WARNING

• Never remodel the power plug nor extend the long-distance cord.
• 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.
• The power cable easily generates heat. Do not bring the cable together with a wire or vinyl tie.

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 won’t operate, check the cable for correct connection.
• Turn on the lamp in the room where the indoor unit is installed and check the remote controller for normal operation.

Refrigerant information

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