Bedienungsanleitung Inventor P9VO32 Passion Eco (Seite 37 von 156) (Deutsch, Englisch)

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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 current permitted for the equipment in

use. Intrinscially 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.

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 take into account the

effects of aging or continual vibration from sources such as compressors or fans.

15. Removal and evacuation

When breaking into the refrigerant circuit to make repairs of 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;

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.

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. 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. 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 or extinguished. If a leakage of refrigernat

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.

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