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14 - MAINTENANCE
The minimal maintenance operations and their periodicity
will be made in accordance with national regulations.
All work on the unit's electrical or refrigerant systems must
be carried out by a qualifi ed authorised technician. See the
standard EN 378-4.
It is advisable to sign a maintenance contract with the installer
or an approved maintenance company.
14.1 General recommendations
Safety instructions
● Technicians working on the unit must wear the necessary
safety gear (e.g. gloves, eye protection, insulating clothing,
safety shoes).
● Similarly, it is recommended that personnel working close
to sources of high noise emission wear ear defenders. The
ear defenders should in no way impede the wearing of other
protective equipment.
● The surfaces of the compressor and pipes may reach
temperatures of over 100°C and cause burns if touched.
Likewise, the surfaces of the compressor may in some cases
drop to freezing temperatures which can cause frostbite. It is
therefore important to take special care when carrying out
maintenance work.
● Do not climb on the machine; use a platform to work at the
necessary height.
● Do not climb on the copper refrigerant pipes.
Caution: Do not work on any electrical components
without fi rst turning off the main door switch in the
electric panel.
Preliminary advise
● Keep the unit clean.
● To avoid accidents and ensure proper ventilation of the coil,
keep the unit and the space around it clean and clear of clutter.
● Check the fouling level of the coil.
Oil
Oils for refrigeration units do not pose any health risks if they
are used in compliance with the precautions for use:
● Avoid unnecessary handling of components lubricated with
oil. Use protective creams.
● Oils are fl ammable and must be stored and handled with care.
Disposable rags or cloths used in cleaning must be kept away
from open fl ames and disposed of in the appropriate manner.
● Containers must be stored with their caps on. Avoid using oil
from an opened container stored under incorrect conditions.
● Check the oil level and aspect. In case of a colour change,
check the oil quality using a contamination test.
● In the case of the presence of acid, water or metallic particles,
replace the aff ected circuit oil, as well as the fi lter dryer.
● If all the oil must be emptied, replace it imperatively with new
oil of the same grade as the original oil which has been stored
in a hermetically sealed container until its time of use.
The oil type recommended for these units is:
Copeland 3MAF 32cST, Danfoss POE 160SZ, ICI Emkarate
RL 32CF, Mobil EAL Artic 22CC.
The following table indicates the required volume:
Main circuits:
50EN/EH 415 420 480 485 540 600 650 720 840 960 1100 1200
Volume (l)
4 x 3,3
Recovery circuit (optional):
50EN/EH 415 420 480 485 540 600 650 720 840 960 1100 1200
Volume (l)
3,0
Refrigerant
Only qualifi ed personnel must perform a periodic leak testing, in
accordance with the regulation (EC) No. 517/2014.
● The frequency of checks is no longer related to the refrigerant
charge but to its global warming potential:
Charge kg x GWP = t CO2e
Carbon dioxide equivalency (t CO2e) is a quantity that
describes, for a given mixture and amount of greenhouse
gas, the amount in tonnes of CO2 that would have the same
global warming potential (GWP).
The number of tonnes of CO2 equivalent (t CO2e) can be
consulted in the following table:
Main circuits:
50EN/EH 415 420 480 485 540 600 650 720 840 960 1100 1200
Charge
2 x
2 x
2 x
2 x
(kg)
17,0
17,0
14,5
17,0
21,0
Environ.
impact
71,0 71,0 60,6 71,0 87,7 89,8 110,7 108,6 121,1 121,1 119,4 129,5
(t CO2e)
Recovery circuit (optional):
50EN/EH 415 420 480 485 540 600 650 720 840 960 1100 1200
Charge
8,0 8,5 8,2 9,0 10,0 10,0 10,0 10,0 9,5
(kg)
Environ.
impact
16,7 17,7 17,1 18,8 20,9 20,9 20,9 20,9 19,8 19,8 21,9 21,9
(t CO2e)
● Operators shall ensure that the unit is checked for leaks ad
minima according to the following frequency:
• t CO2e < 5 ......... not subjected
• t CO2e 5 to 50 ... every year
• t CO2e 50 to 500 every 6 months
• t CO2e > 500 ...... every 3 months
● Where a leakage detection system has been installed the
frequency of checks is halved.
Note: These machines use R410A. It is essential that technicians
use equipment which is compatible with R410A with a working
pressure which is approximately 1.5 times higher than that of
units using R407C.
● Always remember that refrigeration systems contain
pressurised liquids and vapours. All necessary provisions
must be made when the system is partially opened: ensure
the part of the circuit concerned is not pressurised.
● Partial opening of the primary refrigerating circuit will
cause a certain quantity of refrigerant to be released into
the atmosphere. It is essential to keep the amount of lost
refrigerant as low as possible by pumping the charge and
isolating it in another part of the system.
4 x 6,2
3,3
4
6,2
2 x
2 x
2 x
2 x
4 x
4 x
4 x
21,5
26,5
26,0
14,5
14,5
14,3
9,5 10,5 10,5
6,2
4 x
15,5
29
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