Precautions For Using R32 Refrigerant - Panasonic Inverter R32 Series Technical Data & Service Manual

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U-100PZ2R5, U-125PZ2R5, U-140PZ2R5,
U-100PZ2R8, U-125PZ2R8, U-140PZ2R8
PRECAUTION FOR USING R32 REFRIGERANT
• The basic installation work procedures are the same as conventional refrigerant (R410A, R22)
models.
However, pay careful attention to the following points:
Since the working pressure is higher than that of refrigerant R22 models, some of the piping and
installation and service tools are special.
Especially, when replacing a refrigerant R22 model with a new refrigerant R32 model, always replace the
conventional piping and fl are nuts with the R32 and R410A piping and fl are nuts on the outdoor unit side.
For R32 and R410A, the same fl are nut on the outdoor unit side and pipe can be used.
Models that use refrigerant R32 and R410A have a different charging port thread diameter to prevent
erroneous charging with refrigerant R22 and for safety.
Therefore, check beforehand.
Be more careful than R22 so that foreign matter (oil, water, etc.) does not enter the piping.
Also, when storing the piping, securely seal the opening by pinching, taping, etc. (Handling of R32 is
similar to R410A.)
1. Installation (Space)
• That the installation of pipe-work shall be kept to a minimum.
• Must ensure that pipe-work shall be protected from physical damage.
• That compliance with national gas regulations shall be observed.
• Must ensure mechanical connections be accessible for maintenance purposes.
• In cases that require mechanical ventilation, ventilation openings shall be kept clear of obstruction.
• When disposal of the product, do follow to the precautions in "12. Recovery " on page 1-11-21 and
comply with national regulations.Always contact to local municipal offices for proper handling.
2. Servicing
2-1. Service personnel
• Any qualifi ed person who is involved with working on or breaking into a refrigerant circuit should hold
a current valid certifi cate from an industry-accredited assessment authority, which authorizes their
competence to handle refrigerants safely in accordance with an industry recognised assessment
specifi cation.
• Servicing shall only be performed as recommended by the equipment manufacturer. Maintenance
and repair requiring the assistance of other skilled personnel shall be carried out under the
supervision of the person competent in the use of fl ammable refrigerants.
• Servicing shall be performed only as recommended by the manufacturer.
2-2. Work
• Prior to beginning work on systems containing fl ammable refrigerants, safety checks are necessary
to ensure that the risk of ignition is minimised.
For repair to the refrigerating system, " 2-3. General work area " on page 1-11-17 to
" 2-7.Ventilated area " on page 1-11-17 shall be completed prior to conducting work on the system.
• Work shall be undertaken under a controlled procedure so as to minimise the risk of a fl ammable
gas or vapour being present while the work is being performed.
WARNING
CAUTION
1-11-16