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7.3 Scheduled maintenance
The owner must make sure that the unit is periodically inspected, also on-site, adequately maintained, according to the type, size, age and
use of the system, and to the indications contained in the Manual.
Servicing during the unit's operating lifetime and, in particular, scheduled leak detection, on-site inspections and check-ups of safety
equipment, must be carried out as provided by local laws and regulations in force.
If leak detection instruments are installed on the system, they must be inspected at least once a year, to make sure
that they work properly.
During its operating life, the unit shall be inspected and verified in accordance with applicable local laws and regulations. In particular, when
there are no stricter specifications, the indications given in the following table (see EN 378-4, Annex D) must be followed, with reference to
the situations described.
CASE
A
B
C
D
Inspection after an intervention with possible effects on the mechanical strength or after use change or in case the machine has not being working
A
for more than two years. Replace all the components which are not suitable any more. Do not carry out checks at a higher pressure than the one
indicated in the project.
Inspection after a repair, or significant adjustment of the system, or its components. The check may be limited to the interested parts, but if a
B
leakage of refrigerant is detected, a leakage search must be carried out on the entire system.
Inspection after installation in a different position than the original one. Refer to point A when mechanical strength could have been affected by the
C
change.
Leak search, following a well-founded suspicion of refrigerant leakage. It is recommended examined the system for leakage, either directly (use
D
of leak detection systems) or indirectly (deduction of leakage based on analysis of operating parameters), focusing on the parts most prone to
leakage (e.g. joints).
If a defect is detected that compromises the reliable operation of the unit, the unit cannot be re-started until it has been
repaired.
7.4 Periodical checks
The start-up operations should be performed in compliance with all requirements of the previous paragraphs.
All of the operations described in this chapter MUST BE PERFORMED BY TRAINED PERSONNEL ONLY. Before
commencing service work on the unit ensure that the electric supply is disconnected. The top case and dischar-
ge line of compressor are usually at high temperature. Care must be taken when working in their surroundings.
Aluminium coil fins are very sharp and can cause serious wounds. Care must be taken when working in their
surroundings. After servicing, replace the cover panels, fixing them with locking screws.
Visual Inspection
X
X
X
X
Pressure Test
X
X
62
Search for leaks
X
X
X
X
Rev. A 11-2020
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