Gree GWC09AA, Installation And Service Manual

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GREE Service Manual GWC09AA / K5NNA6A Page 39
Flammability
Three components are needed simultaneously for causing fire:
1.
Oxygen
2. Ignition source and
3. The flammable concentration of HC
For ignition, the concentration of HC in air has to be between the lower and up-
per flammable limits. If the concentration is below the lower flammability limit
(LFL) of about 2% by volume in air, there is not enough HC for combustion. If
the concentration is above the upper flammability limit (UFL) of about 10% there
is insufficient oxygen for combustion.
By way of illustration please compare to the schematic view:
Possible ignition sources are:
1. A flame, for example from brazing torch, halide torch leak lamp, match or
lighter, cigarette
2. A spark from an electrical component
3. Static electricity
4. Hot surfaces
Safety data
Hazard Identification
•
Extremely flammable (F+).
•
Readily forms an explosive air-vapour mixture at ambient temperatures.
•
Vapour is heavier than air and may travel to remote sources of ignition
(e.g. along drainage systems, into basements etc).
•
Liquid releases generate large volumes of flammable vapour (approx.
250:1)
•
Cold burns (frostbite) will result from skin / eye contact with liquid.
•
Liquid release or vapour pressure jets present a risk of serious damage to
the eyes.
•
Abuse involving inhalation of high concentrations of vapour, even for short
periods, can produce unconsciousness or may prove fatal. Inhalation may
cause irritation to the nose and throat, headache, nausea, vomiting, dizzi-
ness and drowsiness. In poorly ventilated areas unconsciousness or as-
phyxiation may result.
To ignite HC R-
290, three (3)
components
must exist at the
same time at
work area
to cause the
refrigerant
burning!
2 % 10 %
Oxygen 0 % to 100 %
HC R-290
Refrigerant
1 kg of liquid HC
R-290 refrigerant
creates about
250 litres of gas
Beside the flam-
mability, most
other safety
properties are
similar to other
refrigerants!
Rely always on
best service
practices in
refrigeration!