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2
Precautions of equipment using R32
refrigerant
General (Installation space / area)
• The installation of pipe-work shall be kept to a minimum.
• Pipe-work shall be protected from physical damage.
• The compliance with national gas regulations shall be observed.
• The mechanical connections shall be accessible for maintenance purposes.
• In cases that require mechanical ventilation, ventilation openings shall be kept clear of obstruction.
• When disposing of the product is used, be based on national regulations with properly processed.
• The servicing shall be performed only as recommended by the manufacturer.
• Where the appliance using flammable refrigerants is installed,
Be aware that;
- The appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as
specified for operation.
- The appliance shall be stored in a room without continuously operating open flames (for example an operating
gas appliance) and ignition sources (for example an operating electric heater).
- The appliance shall be stored so as to prevent mechanical damage from occurring.
• Equipment piping in the occupied space shall be installed in such a way to protect against accidental damage in
operation and service.
• Precautions shall be taken to avoid excessive vibration or pulsation to refrigerating piping.
• Protection devices, piping and fittings shall be protected as far as possible against adverse environmental
effects, for example, the danger of water collecting and freezing in relief pipes or the accumulation of dirt and
debris.
• Provision shall be made for expansion and contraction of long runs of piping.
• Piping in refrigerating systems shall be so designed and installed to minimize the likelihood hydraulic shock
damaging the system.
• Solenoid valves shall be correctly positioned in the piping to avoid hydraulic shock.
• Install the system according to this IM and avoid the likelihood hydraulic shock damaging the system.
• Solenoid valves shall not block in liquid refrigerant unless adequate relief is provided to the refrigerant system
low pressure side.
• Install the system according to this Installation Manual so that it does not shut off in the liquid refrigerant.
• Steel pipes and components shall be protected against corrosion with a rustproof coating before applying any
insulation.
• Flexible pipe elements shall be protected against mechanical damage, excessive stress by torsion, or other
forces. They should be checked for mechanical damage annually.
• The indoor equipment and pipes shall be securely mounted and guarded such that accidental rupture of
equipment cannot occur from such events as moving furniture or reconstruction activities.
• Where safety shut off valves are specified, the minimum room area may be determined based on the maximum
amount of refrigerant that can be leaked as determined in Installation Manual.
• Where safety shut off valves are specified, the location of the valve in the refrigerating system relative to the
occupied spaces shall be as described Installation Manual.
• When installing the system that uses flammable refrigerant in a non-ventilated space, it shall be installed in the
large space or with safety equipment as designated below, so as to prevent the refrigerant from staying and
causing a fire or explosion by the refrigerant leak.
19-EN
• Field-made refrigerant joints indoors shall be tightness tested. The test method shall have a sensitivity of 5 grams
per year of refrigerant or better under a pressure of at least 0,25 times the maximum allowable pressure. No leak
shall be detected.
• The total refrigerant charge in the system cannot exceed the requirements for minimum floor area of the smallest
room that is served. For minimum floor area requirements for indoor units, see the Installation and Owner's
Manual of the outdoor unit.
• When connecting to an outdoor unit of the R32 refrigerant and using a leak detector, always turn on the power
of the indoor unit after installation except during service in order to detect refrigerant leakage and take safety
measures.
• Precautions shall be taken to avoid excessive vibration or pulsation to refrigerating piping.
• Only mechanical fittings can be used. (Example: Brazing + Flare connection)
• Refrigerating systems shall use only permanent joints indoors except for site-made joints directly connecting the
indoor unit to the refrigerant piping, or factory made mechanical joints in compliance with ISO 14903.
Unventilated area
• The appliance shall be stored so as to prevent mechanical damage from occurring.
Information on servicing
1.
Check to the area
• Prior to beginning work on systems containing flammable refrigerants, safety checks are necessary to ensure
that risk of ignition is minimized. For repair to the refrigerating system, the precautions in item 2 to 6 shall be
complied with prior to conducting work on the system.
2.
Work procedure
• Work shall be undertaken under a controlled procedure so as to minimize the risk of a flammable gas or vapor
being present while the work is being performed.
• When connecting to an outdoor unit of R32 refrigerant and using a leak detector, the fan may automatically
operate even if the air conditioner is stopped when a refrigerant leak is detected. Be careful not to get injured
by the fan.
• All installers and others working in the local area shall be instructed on the nature of work being carried out.
Work in confined spaces shall be avoided..
3.
General work area
• All maintenance staff and others working in the local area shall be instructed on the nature of work being
carried out.
• Work in confined spaces shall be avoided.
• The area around the workspace shall be sectioned off.
• Ensure that the conditions within the area have been made safe by control of flammable material.
• Only equipment approved by the manufacturer shall be used for duct work.
4.
Checking for presence of refrigerant
• 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 all applicable refrigerants, i.e.
non sparking, adequately sealed or intrinsically safe.
5.
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 on hand.
• Have a dry powder or CO
fire extinguisher adjacent to the charging area.
2
6.
No ignition sources
• No person carrying out work in relation to a refrigeration system which involves exposing any pipe work shall
use any sources of ignition in such a manner that it may lead to the riskof fire or explosion.
• All possible ignition sources including cigarette smoking, should be kept sufficiently far away from the site of
installation, repairing, removing and disposal, during which refrigerant can possibly be released to the
surrounding space.
– 10 –
EN
20-EN
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