AGL_HA_ST_Discus_A2L_A1_EN_Rev00 27
6 Maintenance & repair
Conductor cables! Electrical shock hazard!
Follow the lockout/tag out
procedure and the national regulations before undertaking any maintenance
or service work on the system.
Use compressor with grounded system only. Screwed electrical connections
must be used in all applications. Refer to original equipment wiring diagrams.
Electrical connections must be made by qualified electrical personnel.
Explosive flame! Fire hazard! Oil/refrigerant mixtures are highly flammable.
Remove all refrigerant before
opening the system. Avoid working with an
unshielded flame in a refrigerant-charged system.
Ignition source in a potentially flammable or explosive atmosphere! Fire
and explosion hazard! When opening an A2L-refrigerant
atmosphere could be explosive. All electrical components that are a source of
ignition must always be switched off during service and maintenance. Ensure
that the surface temperatures of the components never exceed the limits set
by the applicable safety standard, eg, EN 378-2.
Air/flammable refrigerant mixture! Fire and explosion hazard! Remove all
refrigerant before opening the system. Make sure to remove refrigerant
completely from all components such as heat exchangers, refrigerant
accumulators, etc. Flush the system and the components with inert gas before
undertaking any work and before brazing.
Open flame in a potentially flammable or explosive atmosphere! Fire and
explosion hazard! The area shall be checked with an appropriate refrigerant
detector prior to and during work on an A2L-refrigerant system, to ensure the
technician is aware of a potentially toxic or flammable atmosphere. Ensure
that the leak detection equipment being used
is suitable for use with all
applicable refrigerants.
Personnel performing work on a refrigeration system that involves exposing
the pipework shall avoid using any ignition source in a way that could lead to
a fire or explosion hazard. All sources of ignition shall be kept sufficiently far
from the site of installation, repair, removal or disposal during the entire time
when refrigerant could be released into the surrounding space.
Open flames and smoking are strictly forbidden at all times.
During service make sure that:
- the area is well ventilated;
- the materials and equipment used are suitable for use under flammable
conditions;
- only non-sparking tools are used;
- antistatic gloves and clothes are used;
- build-up of electrostatic charges is avoided;
- no unshielded or naked flame is used.
If parts of the refrigeration system are charged with flammable refrigerant,
make sure that all the valves are tightly closed and that the open pipes after
the valves are free of refrigerant and oil.
Air/flammable refrigerant mixture! Fire and explosion hazard! After
opening the compressor for service or repair, ensure accurate closing and
hermetic sealing of the opened parts
. Check the sealing surface for any
contamination and use new and proper gasket
material. Use the correct
tightening torques for screws and apply Loctite material wherever necessary.
Always ensure adequate evacuation process and system leak check before
re-filling with refrigerant.
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