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10.3
Preparation for maintenance
10.3.1
General instructions
Work involving intervention in the refrigerant circuit must only be carried out by
qualified engineers in accordance with the guarantee conditions.
The product must always be switched off before being dismantled. Before begin-
ning the work, ensure that all components subject to maintenance/servicing are
de-energised (e.g. by removing the main fuse or installing a jumper wire).
The refrigerant must be removed from the relevant parts of the system. This work
must be carried out with great care, taking into account the safety regulations, so
that the maintenance personnel are not injured by the refrigerant or by the refrig-
erator oil present in the system.
Parts of the system under pressure must be completely drained before opening.
While carrying out the repair, always ensure that there is complete pressure com-
pensation between the relevant pressurised spaces and the surrounding air.
During cleaning, repair or maintenance work, the product or its components must
be protected against the entry of moisture in order to prevent impairment of the
function of the components.
The chief principle must be to keep air and moisture entering the product to an
absolute minimum. Any foreign substances must be kept away or eliminated,
including
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Welding and soldering work may only be performed with the operators consent.
The welder must be in possession of the corresponding permission!
The requisite protective measures must be defined. These include:
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If lines that carry gas have to be opened for maintenance work, these lines must
be in a gas-free state.
L_151511_2
19.12.2019
Danger
Contact with live components is prohibited.
► Produce the earth connection according to the designation in the general
assembly drawing. See chapter "Designation of the earth connection".
► Maintenance work on the running product is not permissible.
welding residues,
sealing remnants,
auxiliary materials such as grease, oil or solvents.
Personal protective measures during the opening of the respective part of the
system,
complete draining of the respective part of the system,
Cleaning with the appropriate cleaning agents,
Concentration measurements,
Ensuring sufficient ventilation and venting,
Performance of all welding work with the use of forming gas.
Maintenance
Preparation for maintenance
93
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