Precautions For Using The Alternative Refrigerant - Fujitsu AJ**A72LBTF Installation Instruction Sheet

This mark indicates procedures which, if improperly performed, might possibly result in personal
CAUTION!
harm to the user, or damage to property.
• Do not install the unit in the following areas:
• Area with high salt content, such as at the seaside.
It will deteriorate metal parts, causing the parts to fall or the unit to leak water.
• Area filled with mineral oil or containing a large amount of splashed oil or steam, such as a kitchen.
It will deteriorate plastic parts, causing the parts to fall or the unit to leak water.
• Area that generates substances that adversely affect the equipment, such as sulfuric gas, chlorine gas,
acid, or alkali.
It will cause the copper pipes and brazed joints to corrode, which can cause refrigerant leakage.
• Area containing equipment that generates electromagnetic interference.
It will cause the control system to malfunction, preventing the unit from operating normally.
• Area that can cause combustible gas to leak, contains suspended carbon fibers or flammable dust, or
volatile inflammables such as paint thinner or gasoline.
If gas leaks and settles around the unit, it can cause a fire.
• Do not use the unit for special purposes, such as storing food, raising animals, growing plants, or preserv-
ing precision devices or art objects.
It can degrade the quality of the preserved or stored objects.
• Ground the unit.
Do not connect the ground wire to a gas pipe, water pipe, lightning rod, or a telephone ground wire.
Improper grounding may cause electric shock.
• Install a ground leakage breaker.
If a ground leakage breaker is not installed, it may cause electric shock or fire.
• Perform drain work in accordance with this Sheet, and ensure that the drain water is properly drained.
If the drain processing is improperly installed, water may drip down from the unit, wetting the furniture.
• Do not touch the fins with bare hands.

2. PRECAUTIONS FOR USING THE ALTERNATIVE REFRIGERANT

PRECAUTIONS FOR USING THE R410A REFRIGERANT
Pay careful attention to the following points :
• Since the working pressure is 1.6 times higher than that of R22 models, some of the piping and installation and service tools are
special. (See the table in the SPECIAL TOOLS FOR R410A section.)
Especially, when replacing a conventional refrigerant (other than R410A) model with a new refrigerant R410A model, always
replace the conventional piping and flare nuts with the R410A piping and flare nuts.
• Models that use refrigerant R410A have a different charging port thread diameter to prevent erroneous charging with R22, R407C
and for safety. Therefore, check beforehand. [The charging port thread diameter for R410A is 1/2 UNF 20 threads per inch.]
• Be more careful than the installation of the refrigerant (other than R410A) models, not to enter foreign matters (oil, water, etc.) and
other refrigerant into the piping. Also, when storing the piping, securely seal the openings by pinching, taping, etc.
• When charging the refrigerant, take into account the slight change in the composition of the gas and liquid phases, and always
charge from the liquid phase side whose composition is stable.
SPECIAL TOOL FOR R410A
Tool name
Pressure is huge and cannot be measured with a conventional gauge. To prevent erroneous mixing of other
refrigerants, the diameter of each port has been changed.
Gauge manifold
It is recommended to use a gauge manifold with a high pressure display range –0.1 to 5.3 MPa and a low
pressure display range –0.1 to 3.8 MPa.
Charging hose To increase pressure resistance, the hose material and base size were changed.
Vacuum pump A conventional vacuum pump can be used by installing a vacuum pump adapter.
Gas leakage detector Special gas leakage detector for HFC refrigerant R410A.
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26/8/2008, 18:23
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