Create Dryplus XL-Spiral Manual De Instrucciones página 14

10.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 current permitted for the equipment in use.
Intrinsically 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 manufacturer. Other parts may result in
the ignition of refrigerant in the atmosphere from a leak.
11.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.
12.LEAKAGE DETECTION FOR 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.
13.LEAK DETECTION METHODS
The following leak detection methods are acceptable for systems containing flammable re-
frigerant.
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 detector is not a potential source of ignition and is
suitable for the refrigerant used.
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 cor-
rode the copper pipe-work.
If a leak is suspected, all naked flames shall be removed/extinguished.
If a leak of refrigerant is found which requires brazing, all of the refrigerant shall be recove-
red from the system. Oxygen free nitrogen (OFN) shall then be purged through the system
both before and during the brazing process.
14.REMOVAL AND EVACUATION
When breaking into the refrigerant circuit to make repairs-or for any other purpose-conven-
tional 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;
• Evacuate;
• Purge again with inert gas;
• Open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into the correct recovery cylinders. The system
shall be"flushed"with OFN to render the unit safe. This process may need to be repeated
several times. Compressed air or oxygen shall not be used for this task.
Flushing shall be achieved by breaking the vacuum in the system with OFN 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 OFN charge is used, the system shall be vented down to atmospheric pressu-
re to enable work to take place.
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