7
UNIT MAINTENANCE
7.3 SCHEDULED
MAINTENANCE
The user must ensure that the unit undergoes adequate maintenance based on what is indicated in the Manual and what is prescribed by the
laws and local regulations in force.
The user must ensure that the unit undergoes adequate inspections, controls and periodic maintenance, based on the type, size, age and
function of the system and on what is indicated in the Manual.
During its operational life, the unit must undergo inspections and checks based on the local laws and regulations in force. In particular, when
there are no more stringent specifications, the indications provided in the following table must be followed (see EN 378-4, ann. D), with
reference to the situations described.
If leak detection tools are installed on the system, they should be inspected at least once a year to ensure they are working
correctly.
If a defect is detected that compromises reliable operation, the unit cannot be put back into operation before that same
defect has been eliminated.
Commissioning operations must be carried out in compliance with all the provisions of the preceding paragraphs.
• All the operations described in this chapter MUST ALWAYS BE PERFORMED BY QUALIFIED PERSONAL.
• Before carrying out any work on the unit or accessing internal parts, make sure that the power supply has been
disconnected.
• The compressor heads and delivery piping are usually found at high temperatures.
• After maintenance operations, close the panels and secure them with the fixing screws.
7.4
PERIODIC AND INITIAL START-UP CHECKS
SITUATION
Visual inspection
Pressure test
Search for leaks
A
X
X
X
B
X
X
X
C
X
X
D
X
X
A
Inspection, after an intervention, with possible effects on mechanical strength, or after a change of use, or after inactivity
of over two years; any unsuitable components must be replaced. Checks must not be carried out at pressures higher than
the design.
B
Inspection following a repair, or a significant change to the system, or to its components. Verification may be limited to
the parts involved in the intervention, but if a refrigerant leak is detected, it will be necessary to perform a leak search
on the entire system.
C
Inspection following installation of the machine in a position other than the original one. If it is possible to have effects
on the mechanical resistance, refer to point A.
D
Leak detection, due to a well-founded suspicion of refrigerant leakage. The system must be examined to identify leaks,
through direct measures (use of systems able to highlight the leak) or indirect measures (deduction of the presence of
the leak based on the analysis of the operating parameters), focusing on the parts most subject to releases (for example,
joints).
Rev. C 09-2020
MTEC.3810.GB-C-1 Operation and maintenance manual serie WZA English
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