IM2023
51
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-free nitrogen (OFN), the system shall be reset to atmospheric pressure to
ensure its operability.
This operation is totally necessary before soldering on the pipelines. Make sure that
the outlet for the vacuum pump is not located near sources of ignition and that there is
ventilation.
16. Cooling agent recharging procedure
The following requirements shall be met in addition to the regular charging procedures.
- Ensure the absence of cross-contamination of different cooling agents during the use
of recharging equipment. Hoses or pipes shall be kept as short as possible in order to
minimize the amount of cooling agent contained in them.
- The cylinders for cooling agent recharging shall be in an upright position.
- Ensure the grounding of the cooling agent system before recharging the system.
- Mark the system when charging is complete.
- Be careful, do not overfill the cooling system.
Test the system under pressure with oxygen-free nitrogen (OFN) before recharging it.
The system shall be checked for leaks after charging is complete, but before
commissioning. Subsequent leak testing shall be carried out before leaving the device
installation site.
17. Decommissioning
The technician shall have enough knowledge of the equipment and all its details before
carrying out this procedure. Requires extensive experience to extract the cooling agent
safely. Before the procedure, take an oil and cooling agent sample in case of necessity
of analysis before reuse of the regenerated cooling agent. It is important to use
electricity only before the start of the procedure.
Procedure:
a) De-energize the device
b) Before the procedure, make sure that all the necessary equipment is available for
cooling agent cylinders; all personal protective equipment is available and used
correctly; the process is controlled continuously by a competent person; the equipment
and cylinders meet the required standards.
c) Pump out the cooling agent system if possible.
d) If vacuuming is not possible, create a collector so that the cooling agent can be
removed from various parts of the system.
e) Ensure that the cylinder is positioned on the scale before the procedure is
performed.
f) Run the cooling agent pumping equipment and use it in accordance with the
manufacturer's instructions.
g) Do not overfill the cylinders (the liquid volume should not exceed 80%).
To Next Page
Loading...
