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Before Installing the Unit
Read Before Installation
CAUTION
Do not install the unit in a place where there is a
possibility of ammable gas leak.
• Leaked gas accumulated around the unit may start a
re or explosion.
Do not use the unit to preserve food, animals, plants,
artifacts, or for other special purposes.
• The unit is not designed to provide adepuate
conditions to preserve the quality of these items.
Do not use the unit in an unusual environment
• The use of the unit in the presence of a large amount
of oil, steam, acid, alkaline solvents or special types of
sprays may lead to a remarkable drop in performance
and/or malfunction and presents a risk of electric
shock, smoke, re, or explosion.
• The presence of organic solvents, corroded gas
(such as ammonia, sulfur compounds,and acid may
cause gas or water leak.)
When installing the unit in a hospital, take necessary
measures against noise.
• High-frequency medical equipment may interfere
with the normal operation of the air conditioning unit or
the air conditioning unit may interfere with the normal
operation of the medical equipment
Do not place the unit on or over things that may not
get wet.
• When humidity level exceeds 80% or when the
drainage system is clogged, indoor units may drip
water.
• Installation of a centralized drainage system for
the outdoor unit may also need to be considered to
prevent water drips from the outdoor units.
Items to be Checked
(1) Verify the type of refrigerant used by the unit to be serviced. Refrigerant Type: R32
(2) Check the symptom exhibited by the unit to be serviced. Look in this service handbook for symptoms relating to
the refrigerant cycle.
(3) Be sure to carefully read the safety precautions at the beginning of this document.
(4) If there is a gas leak or if the remaining refrigerant is exposed to an open ame, a noxious gas hydrouoric acid
may form. Keep workplace well ventilated.
CAUTION
• Install new pipes immediately after removing old ones to keep moisture out of the refrigerant circuit.
• Chloride in some types of refrigerants such as R22 will cause the refrigerating machine oil to deteriorate.
Necessary Tools and Materials
Prepare the following tools and materials necessary for installing and servicing the unit. Necessary tools for use
with R32 (Adaptability of tools that are for use with R407C).
1.To be used exclusively with R32 ( Not to be used if used with R22 or R407C )
Tools/Materials Use Notes
Gauge Manifold Evacuating, Refrigerant Charging 5.09MPa on the High-Pressure Side.
Charging Hose Evacuating, Refrigerant Charging
Hose Diameter Larger than the
Concentional Ones.
Refrigerant Recovery Equipment Refrigerant Recovery
Refrigerant Cylinder Refrigerant Charging
Write Down the Refrigerant type. Pink
in Color at the Top of the Cylinder.
Refrigerant Cylinder Charging Port Refrigerant Charging
Hose Diameter Larger than the
Conventional Ones.
Flare Nut Connecting the Unit to Piping Use Type-2 Flare Nuts.
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