20-EN
19-EN
– 10 –
EN
• When installing the system that uses
fl
ammable 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
fi
re or explosion by the
refrigerant leak.
• 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
fl
oor area of the smallest room that
is served. For minimum
fl
oor 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
fi
ttings can be used. (Example: B 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.
• Protection devices, piping and
fi
ttings 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 IM 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 speci
fi
ed, 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 speci
fi
ed, the location of the
valve in the refrigerating system relative to the occupied spaces
shall be as described Installation Manual.
