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Important Safety Information
READ AND FOLLOW ALL SAFETY INSTRUCTIONS
necessary to continue operation, an adequate temporary
solution shall be used. This shall be reported to the owner
of the equipment so all parties are advised. Initial safety
checks shall include:
•
That capacitors are discharged. This shall be done in
a safe manner to avoid possibility of sparking.
•
That no live electrical components and wiring are
exposed while charging, recovering or purging the
system.
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That there is continuity of earth bonding.
Sealed electrical components shall be replaced
1. During repairs to sealed components, all electrical
supplies shall be disconnected from the equipment being
worked upon prior to any removal of sealed covers, etc.
If it is absolutely necessary to have an electrical supply to
equipment during servicing then a permanently operating
form of leak detection shall be located at the most critical
point to warn of a potentially hazardous situation.
2. To ensure that by working on electrical components
the casing is not altered in such a way that the level of
protection is affected, particular attention shall be paid to
the following:
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Damage to cables, excessive number of connections,
terminals not made to original specification, damage to
seals, incorrect fitting of glands, etc.
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Ensure the apparatus is mounted securely.
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Ensure that seals or sealing materials have not degraded
such that they no longer serve the purpose of preventing
the ingress of flammable atmospheres. Replacement
parts shall be in accordance with the manufacturer's
specifications.
Note: The use of silicon sealant may inhibit the effectiveness
of some types of leak detection equipment. Intrinsically safe
components do not have to be isolated prior to working on
them.
Intrinsically safe components must be replaced
Do not apply any permanent inductive or capacitance loads
to the circuit without ensuring that this will not exceed the
permissible voltage and current permitted for the equipment
in use. Intrinsically safe components are the only types that
can be worked on while 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.
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.
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.
Leak detection methods
The following leak detection methods are deemed acceptable
for systems containing flammable refrigerants:
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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 the best practice is followed since
flammability is a consideration. The following procedures shall
be adhered to:
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SAVE THESE INSTRUCTIONS!
Electronic leak detectors shall be used to detect flammable
refrigerants but the sensitivity may not be adequate or
may need recalibration. 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 or pipe-work.
If a leak is suspected, all naked flames shall be removed
or 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. Removal of refrigerant
shall be according to Removal and evacuation.
Safely remove refrigerant following local and national
regulations;
Evacuate;
Purge the circuit with inert gas (optional for A2L);
Evacuate (optional for A2L);
Continuously flush or purge with inert gas when using
flame to open circuit: and
Open the Circuit.
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