turbionaire Practical 12 Manual De Instrucciones página 15

NOTĂ: Utilizarea materialului de etanșare cu silicon poate inhiba eficacitatea unor tipuri de
echipamente de detectare a scurgerilor. Componentele cu securitate intrinsecă nu trebuie
izolate înainte de a se lucra la ele.
k. 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.
l. 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.
m. 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.
n. Leak detection methods
The following leak detection methods are acceptable for systems containing flammable
refrigerant. 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 corrode 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
recovered from the system. Oxygen free nitrogen (OFN) shall then be purged through the
system both before and during the brazing process.
o. 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.
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