Inventum AC127W Mode D'emploi page 21

6. Information about maintenance (Appendix DD.3)
1) Check the surrounding area
Prior to working at systems containing combustible refrigerants, safety checks are required to make sure that the risk of ignition
is limited to a minimum. When repairing cooling systems, take the following precautions before performing work at the system.
2) Working procedure
Perform work in accordance with a regulated procedure to minimize the risk of released combustible gases or vapours during
the work.
3) General work area
Inform all maintenance personnel and others working in the vicinity of the nature of the work to be performed. Avoid working
in enclosed spaces. Demarcate the area around the workplace. Make sure the work area is safe by checking for the presence
of combustible material and ignition sources.
4) Check for the presence of refrigerant
Check the area prior and during the work with a suitable refrigerant detector, which will warn the technician for the presence
of possibly combustible ambient air. Only use leak detection equipment that is suitable for use with combustible refrigerants,
i.e. free from sparks, adequately guarded or intrinsically safe.
5) Keep a fire extinguisher within reach
If hot work must be performed at cooling equipment or related parts, suitable extinguishing agents should be present within
reach. Immediately next tot he filling area, mount a powder extinguisher or CO2 extinguisher.
6) Keep ignition sources at a distance
Anyone performing work at a cooling system whereby pipes (once) containing combustible refrigerant are laid bare, may not
use ignition sources that could cause a fire or an explosion. Keep all possible ignition sources, including lighted cigarettes,
sufficiently far removed from the place of installation, repair or disposal, where combustible refrigerant could be released
in the environment. Check prior to performance of the work that there are no combustible materials or ignition sources in the
area around the equipment.
Hang warning signs with the text "Smoking prohibited".
7) Provide ventilation
Work in the open air or ensure that the work area is sufficiently ventilated before you open the system or perform hot work.
Continuously ensure sufficient ventilation during the performance of the work. The ventilation should blow away any released
refrigerant to a safe place and preferable discharge it to the outdoor air.
8) Check the cooling equipment
Replace electric components only by equivalent parts that meet the correct specifications. Always observe the
manufacturer's guidelines for maintenance and repair. In case of doubt, contact the technical support service of the
manufacturer for support.
Check installations using combustible refrigerants regarding the following:
- The filling volume should correspond with the dimensions of the room in which the refrigerant containing components
are installed;
- The ventilation equipment and exhausts should work properly and may not be blocked.
- If an indirect cooling circuit is being used, the secondary circuit must be checked for the presence of refrigerant;
- All markings on the equipment must be visible and legible. Repair all markings and signs that have become illegible in advance;
- Cooling pipes and components containing refrigerant must be installed in such a way that it is unlikely that they are exposed
to substances that could corrode them, to the extent that the components are not made of materials that are inherently
resistant to corrosion or are adequately protected against corrosion.
9) Check electrical appliances
In the event of repair and maintenance of electrical components, always first check them for safety and observe the
inspection procedures for the components. If there is a failure that could jeopardise safety, no electrical power supply may be
connected to the circuit before this failure has been resolved. If the failure cannot immediately be resolved, but the appliance
must remain operational, a suitable temporary solution must be achieved. Always report this to the owner of the equipment,
so that all involved parties are informed.
Safety checks in advance include:
• Discharging condensers: this should be done in a safe way to prevent the creation of sparks;
• Check that there are no live electrical components and wires lying bare when filling, draining or flushing the system;
• Check that the continuity of the earthed connections is guaranteed.
7. Repairs to guarded components (Appendix DD.4)
1) When performing repairs to guarded components, disconnect all electrical power supplies from the equipment being
work on, before removing the cover plates, etc.. If it is absolutely necessary to keep the power supply switched on during
maintenance to the equipment, a permanently active leak detector should be installed at the most critical point to warn for
the occurrence of possibly hazardous situations.
2) Pay extra attention to the following, to make sure that the housing is not changed in such a way during work at electrical
components that the protection level is affected.
You could think of damaged cables, making too many attachments per connection, clamps that do not meet the original
specifications, damaged seals, incorrect assembly of gaskets, etc.
Make sure the equipment is firmly attached.
Check that seals and sealing materials are still sufficiently able to prevent penetration of combustible ambient air. Only use
replacement parts that meet the manufacturer's specifications.
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