Bedienungsanleitung Livoo DOM392 (Seite 28 von 138) (Deutsch, Englisch, Holländisch, Französisch, Italienisch, Portugiesisch, Spanisch)

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Safety precautions

28EN

5. Detection of ammable 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

ame) shall not be used.

6. Leak detection methods

The following leak detection methods are

deemed acceptable for systems containing

ammable refrigerants. Electronic leak detectors

shall be used to detect ammable 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 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 conrmed.Leak detection uids 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 ames shall be removed/

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. Oxygen free nitrogen

(OFN) shall then be purged through the system

both before and during the brazing process.

7. 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 ammability

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 “ushed” 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 ll until the working pressure is

achieved, then venting to atmosphere, and nally

pulling down to a vacuum. This process shall be

repeated until no refrigerant is within the system.

When the nal OFN charge is used, the system

shall be vented down to atmospheric pressure

to enable work to take place. This operation is

absolutely vital if brazing operations on the pipe-

work are to take place. Ensure that the outlet

for the vacuum pump is not close to any ignition

sources and there is ventilation available.

8. Charging procedures

In addition to conventional charging procedures,

the following requirements shall be followed.

• Ensure that contamination of different

refrigerants does not occur when using

charging equipment. Hoses or lines shall be

as short as possible to minimise the amount

of refrigerant contained in them.

• Cylinders shall be kept upright.

• Ensure that the refrigeration system is earthed

prior to charging the system with refrigerant.

• Label the system when charging is complete

(if not already).

• Extreme care shall be taken not to overll the

refrigeration system.

Prior to recharging the system it shall be

pressure tested with OFN. The system shall be

leak tested on completion of charging but prior

to commissioning. A follow up leak test shall be

carried out prior to leaving the site.

9. Decommissioning

Before carrying out this procedure, it is essential

that the technician is completely familiar with the

equipment and all its detail. It is recommended

good practice that all refrigerants are recovered

safely. Prior to the task being carried out, an oil

and refrigerant sample shall be taken in case

analysis is required prior to re-use of reclaimed

refrigerant. It is essential that electrical power is

available before the task is commenced.

a. Become familiar with the equipment and its

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