Loading ...
Loading ...
Loading ...
Safety precautions /
Lt
CAUTION
live in the presence
of
a flammable atmosphere. The
test
apparatus shall be at
the correct rating.
• Replace components only with parts specified by the manufacturer.
• Other parts may result in the ignition
of
refrigerant in the atmosphere from a
leak.
9.
Cabling
• Check
that
cabling will not be subject to wear, corrosion, excessive pressure,
vibration, sharp edges or any other adverse environmental effects.
• The check shall also take into account the effects
of
aging
or
continual
vibration from sources such as compressors
or
fans.
1 a.Detection
of
flammable refrigerants
• Under
no
circumstances shall potential sources
of
ignition be used
in
the
searching
for
or detection
of
refrigerant leaks.
• A halide torch (or
any
other
detector
using a naked flame) shall
not
be used.
11. Leak detection methods
• The following
leak
detection methods are deemed acceptable
for
systems
containing flammable refrigerants:
- Electronic leak detectors shall be used
to
detect flammable refrigerants, but
the sensitivity may not be adequate, or may need re-calibration. (Detection
equipment shall be calibrated in a refrigerant-free area.)
- Ensure that the detector is not a potential source
of
ignition and is suitable
for
the refrigerant used.
- Leak detection equipment shall be set at a percentage
of
the LFL
of
the
refrigerant and shall be calibrated to the refrigerant employed and the
appropriate percentage
of
gas (25 % maximum) is confirmed.
- Leak detection fluids are suitable
for
use with most refrigerants but the use
of
detergents containing chlorine shall be avoided as the chlorine may react
with the refrigerant and corrode the copper pipe-work.
-
If
a
leak
is suspected, all naked flames shall be removed/ extinguished.
-
If
a leakage
of
refrigerant is found which requires brazing, all
of
the
refrigerant shall be recovered from the system,
or
isolated (by means
of
shut
off
valves) in a
part
of
the system remote from the leak.
- Oxygen free nitrogen (OFN) shall then be purged through the system both
before and during the brazing process.
12.Removal and evacuation
• When breaking into the refrigerant circuit to make
repairs-
or
for
any
other
purpose - conventional procedures shall be used.
• However,
it
is important that best practice is followed since flammability is a
consideration.
• The following procedure shall be adhered to:
- Remove refrigerant;
- Purge the circuit with inert gas;
-8-
Loading ...
Loading ...
Loading ...