Zodiac Z350iQ Manual De Instalación Y De Uso página 25

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.
Wiring
• 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.
Detection of flammable refrigerant
• 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.
• The following leak detection methods are deemed acceptable for all refrigerant systems.
• Electronic leak detectors may be used to detect refrigerant leaks but, in the ease of flammable refrigerants, the
sensitivity may not be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a refrigerant-
tree 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 also 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 names 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.
Removal and discharge
• When breaking into the refrigerant circuit to make repairs - or for any other purpose - conventional procedures shall
be used. However, for flammable refrigerants 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 (optional for A2L);
- evacuate (optional for A2L);
- purge with inert gas (optional for A2L);
- open the circuit by cutting or brazing.
• The refrigerant charge shall be recovered into the correct recovery cylinders. For appliances containing flammable
refrigerants other than A2L refrigerants, the system shall be purged with oxygen-free nitrogen to render the appliance
safe for flammable refrigerants. This process may need to be repeated several times. Compressed air or oxygen shall
not be used for purging refrigerant systems.
Loading procedures
• Ensure that the outlet for the vacuum pump is not close to any potential ignition sources and that ventilation is
available.
• 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 in an appropriate position according to the instructions.
- Ensure that the refrigerating 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 refrigerating system.
• Prior to recharging the system, it shall be pressure-tested with the appropriate purging gas. 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.
Dismantling
• 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 recovered refrigerant. It
is essential that electrical power is available before the task is commenced.
1. Become familiar with the equipment and its operation.
2. Isolate system electrically.
3. Before attempting the procedure, ensure that:
- mechanical handling equipment is available. if required. for handling refrigerant cylinders;
- all personal protective equipment is available and being used correctly:
- the recovery process is supervised at all times by a competent person;
- recovery equipment and cylinders conform to the appropriate standards.
4. Pump down refrigerant system, if possible.
5. If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the system
6. Make sure that cylinder is situated on the scales before recovery takes place.
7. Start the recovery machine and operate in accordance with instructions.
8. Do not overfill cylinders (no more than 80 % volume liquid charge).
9. Do not exceed the maximum working pressure of the cylinder, even temporarily.
10. When the cylinders have been filled correctly and the process completed, make sure that the cylinders and the
equipment are removed from site promptly and alt isolation valves on the equipment are closed off.
11. Recovered refrigerant shall not be charged into another refrigerating system unless it has been cleaned and checked.
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