Precaution For Using R32 Refrigerant - Panasonic CU-4Z80TBE Service Manual

2. 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.
(See "2.1. Special tools for R32 (R410A)".)
1. Especially, when replacing a refrigerant R22 model with a new refrigerant R32 model, always replace the conventional piping and flare
nuts with the R32 and R410A piping and flare nuts on the outdoor unit side.
For R32 and R410A, the same flare 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
2. R22 and for safety.
Therefore, check beforehand. [The charging port thread diameter for R32 and R410A is 12.7 mm (1/2 inch).]
Be more careful than R22 so that foreign matter (oil, water, etc.) does not enter the piping.
3.
Also, when storing the piping, securely seal the opening by pinching, taping, etc. (Handling of R32 is similar to R410A.)
Installation (Space)
• Must ensure the installation of pipe-work shall be kept to a minimum. Avoid use dented pipe and do not allow acute bending.
• Must ensure that pipe-work shall be protected from physical damage.
• Must comply with national gas regulations, state municipal rules and legislation. Notify relevant authorities in accordance with all
1. applicable regulations.
• 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 and comply with national regulations.
Always contact to local municipal offices for proper handling.
Servicing
2-1. Service personnel
• Any qualified person who is involved with working on or breaking into a refrigerant circuit should hold a current valid certificate from an
industry-accredited assessment authority, which authorizes their competence to handle refrigerants safely in accordance with an industry
recognized assessment specification.
• 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 flammable refrigerants.
• Servicing shall be performed only as recommended by the manufacturer.
2-2. Work
• Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure that the risk of ignition is
minimised.
For repair to the refrigerating system, the precautions in #2-2 to #2-8 must be followed before conducting work on the system.
• Work shall be undertaken under a controlled procedure so as to minimize the risk of a flammable gas or vapour being present while the
work is being performed.
• All maintenance staff and others working in the local area shall be instructed and supervised on the nature of work being carried out.
• Avoid working in confined spaces.
• Wear appropriate protective equipment, including respiratory protection, as conditions warrant.
• Ensure that the conditions within the area have been made safe by limit of use of any flammable material. Keep all sources of ignition
and hot metal surfaces away.
2-3. Checking for presence of refrigerant
2.
• The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure the technician is aware of
potentially flammable atmospheres.
• Ensure that the leak detection equipment being used is suitable for use with flammable refrigerants, i.e. non sparking, adequately sealed
or intrinsically safe.
• In case of leakage/spillage happened, immediately ventilate area and stay upwind and away from spill/release.
• In case of leakage/spillage happened, do notify persons down wind of the leaking/spill, isolate immediate hazard area and keep
unauthorized personnel out.
2-4. Presence of fire extinguisher
• If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing equipment shall
be available at hand.
• Have a dry powder or CO
2-5. No ignition sources
• No person carrying out work in relation to a refrigeration system which involves exposing any pipe work that contains or has contained
flammable refrigerant shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. He/She must not
be smoking when carrying out such work.
• All possible ignition sources, including cigarette smoking, should be kept sufficiently far away from the site of installation, repairing,
removing and disposal, during which flammable refrigerant can possibly be released to the surrounding space.
• Prior to work taking place, the area around the equipment is to be surveyed to make sure that there are no flammable hazards or ignition
risks.
• "No Smoking" signs shall be displayed.
fire extinguisher adjacent to the charging area.
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WARNING
CAUTION
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