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Warning:
As k the dealer or an authorised technician to install the unit.
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- Improper installation by the user may result in water leakage, electric shock, or fire.
Use the specified cables for wiring. Make the connections securely so that any outside forces acting on the cables are
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not applied to the terminals.
- Inadequate connection and fastening may generate heat and cause a fire.
Prepare for typhoons and other strong winds and earthquakes and install the unit at the specified place.
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- Improper installation may cause the unit to topple and result in injury.
Never repair the unit. If the controller must be repaired, consult the dealer.
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- If the unit is repaired improperly, electric shock, or fire may result.
When handling this product, always wear protective equipment. EG: Gloves, full arm protection namely boiler suit, and safety glasses.
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- Improper handling may result in injury.
If refrigerant gas leaks during installation work, ventilate the room.
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- If the refrigerant gas comes into contact with a flame, poisonous gases will be released.
Install the controller according to this Installation Manual.
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- If the unit is installed improperly, electric shock, or fire may result.
Have all electric work done by a licensed electrician according to "Electric Facility Engineering Standard", "Interior Wire
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Regulations" and the instructions given in this manual and always use a special circuit.
- If the power source capacity is inadequate or electric work is performed improperly, electric shock and fire may result.
Keep the electric parts away from any water - washing water etc...
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- Contact may result in electric shock, fire or smoke.
Securely install the outdoor unit terminal cover (panel).
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- If the terminal cover (panel) is not installed properly, dust or water may enter the outdoor unit and fire or electric shock may result.
When installing and mo ving the air handling unit to another site, do not charge the unit with a refrigerant different from the
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refrigerant specified on the unit.
- If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and the unit may be damaged.
If the air handling unit is installed in a small room, measures must be taken to prevent the refrigerant concentration from
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exceeding the safety limit even if the refrigerant should leak.
- Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceeded. Should the refrigerant leak and cause the
safety limit to be exceeded, hazards due to lack of oxygen in the room could result.
• When moving and reinstalling the air handling unit, consult the dealer or an authorised technician.
- If the controller is installed improperly, electric shock, or fire may result.
• After completing installation work, make sure that refrigerant gas is not leaking.
- If the refrigerant gas leaks and is exposed to a fan heater, stove, oven, or other heat source, it may generate noxious gases.
Do not reconstruct or change the settings of the protection devices.
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- If the pressure switch, thermal switch, or other protection device is shorted or operated forcibly, or parts other than those specified by Mitsubishi
Electric are used, fire or explosion may result.
• To dispose of this product, consult your dealer.
• Do not use a leak detection additive.
1.2. Precautions for devices that use R410A refrigerant
Caution:
• Do not use the existing refrigerant piping.
- The old refrigerant and refrigerator oil in the existing piping contains a large amount of chlorine which may cause the refrigerator oil of the
new unit to deteriorate.
• Use refrigerant piping made of C1220 (CU-DHP) phosphorus deoxidized copper as specified in the JIS H3300" Copper and copper alloy
seamless pipes and tubes". In addition, be sure that the inner and outer surfaces of the pipes are clean and free of hazardous
sulphur, oxides, dust/dirt, shaving particles, oils, moisture, or any other contaminant.
- Contaminants on the inside of the refrigerant piping may cause the refrigerant residual oil to deteriorate.
Store the piping to be used during installation indoors and keep both ends of the piping sealed until just befo re
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brazing. (Store elbows and other joints in a plastic bag.)
- If dust, dirt, or water enters the refrigerant cycle, deterioration of the oil and compressor problems may result.
Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections.
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- The refrigerator oil will degrade if it is mixed with a large amount of mineral oil.
Use liquid refrigerant to fill the system.
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- It gas refrigerant is used to seal the system, the composition of the refrigerant in the cylinder will change and performance may drop.
Do not use a refrigerant other than R410A.
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- If another refrigerant (R22, etc.) is used, the chlorine in the refrigerant may cause the refrigerator oil to deteriorate.
Use a vacuum p ump with a reverse flow check valve.
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- The vacuum pump oil may flow back into the refrigerant cycle and cause the refrigerator oil to deteriorate.
Do not use the following tools that are used with conventional refrigerants. (Gauge manifold, charge hose, gas leak detector,
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reverse flow check valve, refrigerant charge base, vacuum gauge, refrigerant recovery equipment.)
- If the conventional refrigerant and refrigerator oil are mixed in the R410A, the refrigerant may deteriorate.
- If water is mixed in the R410A, the refrigerator oil may deteriorate.
- Since R410A does not contain any chlorine, gas leak detectors for conventional refrigerants will not react to it.
D o n ot use a charging cylinder.
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- Using a charging cylinder may cause the refrigerant to deteriorate.
Be especially careful when managing the tools.
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- If dust, dirt, or water gets in the refrigerant cycle, the refrigerant may deteriorate.
1.3. Before installation
Caution:
Do not install the unit where combustible gas may leak.
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- If the gas leaks and accumulates around the unit, an explosion may result.
Do not use the air conditioner where food, pets, plants, precision instruments, or artwork are kept.
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- The quality of the food, etc. may deteriorate.
Do not use the air conditioner in special environments.
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- Oil, steam, sulphuric smoke, etc. can significantly reduce the performance of the air conditioner or damage its parts.
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