Hyundai H-DH10-P81WF Instruction Manual page 33

IM2021
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.
14. 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-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.
15. 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.
16. 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.
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