Samsung AR TXHZ Series Installation Manual page 5

• Servicing shall be performed as recommended by the
manufacturer. In case other skilled persons are joined
for servicing, it shall be carried out under supervision
of the person who is competent in handling flammable
refrigerants.
• For servicing the units containing flammable refrigerants,
safety checks are required to minimise the risk of ignition.
• Servicing shall be performed following the controlled
procedure to minimize the risk of flammable
refrigerant or gases.
• Do not install where there is a risk of combustible gas
leakage.
• Do not place heat sources.
• Be cautious not to generate a spark as follows:
‐ Do not remove the fuses with power on.
‐ Do not disconnect the power plug from the wall
outlet with power on.
‐ It is recommended to locate the outlet in a high
position. Place the cords so that they are not tangled.
• If the indoor unit is not R-32 compatible, an error signal
appears and the unit will not operate.
• After installation, check for leakage. Toxic gas may be
generated and if it comes into contact with an ignition
source such as fan heater, stove, and cooker.cylinders, make
sure that only the refrigerant recovery cylinders are used.
Preparation of fire extinguisher
• If a hot work is to be done, an appropriate fire
extinguishing equipment should have been available.
• A dry powder or CO₂ fire extinguisher shall be equipped
near the charging area.
Ignition sources free
• Make sure to store the units in a place without
continuously operating ignition sources (for example,
open flames, an operating gas appliance or an
operating electric heater).
• The service engineers shall not use any ignition sources
with the risk of fire or explosion.
• Potential ignition sources shall be kept away from
the work area where the flammable refrigerant can
possibly be released to the surrounding.
• The work area should be checked to ensure that there
are no flammable hazards or ignition risks. The "No
Smoking" sign shall be attached.
• Under no circumstances shall potential sources of
ignition be used while in detection of leakage.
• Make sure that the seals or sealing materials have not
degraded.
• Safe parts are the ones with which the worker can work
in a flammable atmosphere. Other parts may result in
ignition due to leakage.
• Replace components only with parts specified by
Samsung. Other parts may result in the ignition of
refrigerant in the atmosphere from a leak.
Area ventilation
• Make sure that the work area is well ventilated before
performing a hot work.
• Ventilation shall be made even during the work.
• The ventilation should safely disperse any released
gases and preferably expel them into the atmosphere.
Leakage detection methods
• The leakage detector shall be calibrated in a
refrigerant-free area.
• Make sure that the detector is not a potential source
of ignition.
• The leakage detector shall be set to the LFL (lower
flammability limit).
• The use of detergents containing chlorine shall be
avoided for cleaning because the chlorine may react
with the refrigerant and corrode the pipings.
• If leakage is suspected, naked flames shall be removed.
• If a leakage is found while in brazing, the entire
refrigerant shall be recovered from the product or
isolated (e.g. using shut-off valves). It shall not be
directly released to the environment. Oxygen free
nitrogen (OFN) shall be used for purging the system
before and during the brazing process.
• The work area shall be checked with an appropriate
refrigerant detector before and during work.
• Ensure that the leakage detector is appropriate for use
with flammable refrigerants.
Labelling
• The parts shall be labelled to ensure that they have
been decommissioned and emptied of refrigerant.
• The labels shall be dated.
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