11.
Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance loads to the circuit without
ensuring that this will not exceed the permissible voltage and currently permitted
for the equipment in use.
Intrinsically safe components are the only types that can be worked on while living
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.
12.
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 consider the effects of ageing or continual vibration from sources such as
compressors or fans.
13.
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.
14.
Removal and evacuation
When breaking into the refrigerant circuit to make repairs – or for any other purpose
– conventional procedures shall be used. However, for flammable refrigerants, best
practice must be followed since flammability is a consideration. The following
procedure shall be adhered to:
•
Remove refrigerant
•
Purge the circuit with inert gas
•
Evacuate
•
Purge with inert gas
•
Open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into the correct recovery cylinders. For
appliances containing flammable refrigerants, the system shall be purged with
oxygen-free nitrogen to render the appliance safe for flammable refrigerants. This
process may need to be repeated several times. Compressed air or oxygen shall
not be used for purging refrigerant systems.
For appliances containing flammable refrigerants, refrigerants purging shall be
achieved by breaking the vacuum in the system with oxygen-free nitrogen and
continuing to fill until the working pressure is achieved, then venting to atmosphere
and finally pulling down to a vacuum. This process shall be repeated until no
refrigerant is within the system. When the final oxygen-free nitrogen charge is used,
the system shall be vented down to atmospheric pressure to enable work to take
place. This operation is vital if brazing operations on the pipework are to take place.
Ensure that the outlet for the vacuum pump is not close to any potential ignition
sources and that ventilation is available.
Summary of Contents for SMARTERHOME KAWFPAC09YA
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