Bedienungsanleitung Argo Hi-comfort Plus (Seite 28 von 30) (Englisch)

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the correct specications. The manufacturer’s maintenance and service guidelines should always be followed. If

in doubt, consult the manufacturer’s technical department for assistance.

7. Repairs on sealed components. During repairs to sealed components, all electrical supplies must be disconnected

from the equipment being worked on before removing the sealed covers, etc. If it is absolutely necessary to have

an electrical power supply to the equipment during maintenance, then a leak detection device must be placed at

the most critical point to warn of a potentially dangerous situation. Particular attention must be paid to the following

to ensure that, by working on the electrical components, the casing is not altered in such a way as to compromise

the level of protection. This includes damage to cables, excessive number of connections, terminals not made to

original specications, damage to gaskets, incorrect assembly of cable glands, etc.

• Make sure the appliance is mounted securely.

• Ensure that gaskets or sealing materials are not degraded to the point that they no longer serve the purpose

of preventing the entry of ammable atmospheres. Replacement parts must conform to the manufacturer’s

specications.

Note: the use of silicone sealant can inhibit the effectiveness of some types of leak detection equipment. Intrinsically

safe components do not need to be isolated before working on them.

8. Repair of intrinsically safe components. Do not apply permanent inductive or capacitive loads to the circuit

without ensuring that it does not exceed the voltage and current allowed for the equipment in use. The intrinsically

safe components are the only ones that can be worked on in the presence of a ammable atmosphere. The test

equipment must be of the correct evaluation. Replace components only with parts specied by the manufacturer.

Other parts can cause the refrigerant to ignite in the atmosphere due to a leak..

9. Wiring. Verify that the wiring is not subject to wear, corrosion, excessive pressure, vibration, sharp edges, or other

adverse environmental effects. The control must also take into account the effects of aging or continuous vibrations

from sources such as compressors or fans.

10. Deactivation. Before carrying out this procedure, it is essential that the technician is fully familiar with the equipment

and all its details. Good practice is recommended that all refrigerants be recovered safely. Before the task is

performed, a sample of the oil and refrigerant must be taken in case an analysis is required before reuse of the

recovered refrigerant. It is essential that electricity is available before the start of the activity.

A. Become familiar with the equipment and its operation.

B. Electrically isolate the system.

C. Before attempting the procedure, make sure that:

• mechanical handling equipment is available, if required, for handling the refrigerant cylinders;

• all personal protective equipment is available and used correctly;

• the recovery process is supervised at all times by a competent person;

• Recovery equipment and cylinders comply with appropriate standards.

D. If possible, drain the refrigerant system.

E. If vacuum is not possible, make a manifold so that the refrigerant can be removed from the various parts of

the system.

F. Make sure the cylinder is placed on the scale before recovery takes place.

G. Start the recovery machine and operate according to the manufacturer’s instructions

H. Do not overll the cylinders. (Not more than 80% by volume of liquid charge).

I. Do not exceed, even temporarily, the maximum working pressure of the cylinder.

J. When the cylinders have been lled correctly and the process is complete, ensure that the cylinders and

equipment are promptly removed from the site and that all isolation valves on the equipment are closed.

K. Recovered refrigerant should not be charged to another refrigeration system unless it has been cleaned and

checked.

11. Labeling. The equipment must be labeled indicating that it has been shut down and drained of refrigerant. The

label must be dated and signed. For appliances containing ammable refrigerants, make sure there are labels on

the appliance indicating that the appliance contains ammable refrigerant..

Recovery

When removing refrigerant from a system, whether for maintenance or decommissioning, It is recommended that all

refrigerants be removed safely. When transferring refrigerant to cylinders, ensure that only appropriate refrigerant

recovery cylinders are used. Make sure the correct number of cylinders are available to maintain full system charge. All

cylinders to be used are designated for the recovered refrigerant and labeled for that refrigerant (i.e. special cylinders

for recovering refrigerant). The cylinders must be complete with pressure relief valve and relative shut-off valves in

good working order. Empty recovery cylinders are evacuated and, if possible, cooled before recovery takes place.

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