Bedienungsanleitung MaxxHome 20736 - AC12M (Seite 9 von 26) (Englisch)

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detection of refrigerant leaks. A halide torch (or any other detector using a naked flame)

shall not be used.

6 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 recalibration. (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 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/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 – con-

ventional 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 pressure to enable work to take

place.This operation is absolutely vital if brazing operations on the pipework 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 overfill 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

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