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12. Wiring
Make sure the cables are not exposed to wear, corrosion, overpressure, vibration,
damage due to contact with sharp edges, or any other adverse environmental effects.
Take into account also the effects of wear from physical obsolescence or constant
vibration from such sources as compressors or air fans.
13. Flammable cooling agents leak detection
Do not use appliances that can be a potential source of ignition when searching for or
detecting cooling agent leaks under any circumstances. The use of halogen leak
detectors (or any other means of open flame detection) is prohibited.
14. Leak detection methods
The following leak detection methods shall be considered as acceptable for systems
containing highly flammable cooling agents.
In order to detect flammable cooling agents, use electronic leak detectors, however, the
sensitivity may be insufficient or recalibration may be required (the detection equipment
shall be calibrated in a cooling agent-free area.) Make sure that the detector cannot
serve as a potential source of ignition and is suitable for the used cooling agent.
Leak detection fluids are suitable for application with most cooling agents, however, the
use of detergents containing chlorine shall be avoided, as the chlorine may react with
cooling agent and corrode the copper piping.
In case of leakage, remove / extinguish all open flame sources.
All the cooling agents shall be removed from the system in case of necessity of soldering,
due to the existence of cooling agent leakage. The oxygen-free nitrogen (OFN) shall
then be purged through the system both before and during the soldering process.
15. Removal and vacuuming
The usual procedures shall be followed when interfering with the cooling agent circuit to
carry out repairs or for any other purpose. It is necessary to take into account the
flammability of the cooling agent when performing these procedures.
Carry out the following procedures:
Remove the cooling agent;
Purge the circuit with an inert gas;
Pump out the gas;
Purge with an inert gas again;
Open the circuit, using soldering or trimming
It is necessary to extract the cooling agent into special cylinders for extracting the cooling
agents,. The system shall be “flushed” with oxygen-free nitrogen (OFN) to make the
device safe. This process may need to be repeated several times. Do not use
compressed air or oxygen in this procedure.
Flush the system by breaking the vacuum in it with oxygen-free nitrogen (OFN) and
continuing to fill it until reaching the operating pressure; then release it into the
atmosphere, and then vacuum it again. This process shall be repeated until the complete
absence of the cooling agent in the system. In case of use of the last charge of oxygen-
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