D-EIMHP01505-22_00EN 43/59
8. MAINTENANCE
Personnel working on the electrical or the refrigeration components must be authorized, trained and fully qualified.
Maintenance and repair requiring the assistance of other skilled personnel should be carried out under the supervision of
the person competent in the use of flammable refrigerants. Any person conducting servicing or maintenance on a system
or associated parts of the equipment should be competent according to EN 13313.
Persons working on refrigerating systems with flammable refrigerants should have competence in safety aspects
of flammable refrigerant handling supported by evidence of appropriate training.
No person carrying out work in relation to a refrigerating system which involves exposing any pipe work shall use any
sources of ignition in such a manner that it may lead to the risk of fire or explosion. All possible ignition sources, including
cigarette smoking, should be kept sufficiently far away from the site of installation, repairing, removing and disposal, during
which refrigerant can possibly be released to the surrounding space. Prior to work taking place, the area around the
equipment is to be surveyed to make sure that there are no flammable hazards or ignition risks.
“No Smoking” signs shall
be displayed.
Always protect the operating personnel with personal protective equipment appropriate for the tasks to be performed.
Common individual devices are: Helmet, goggles, gloves, caps, and safety shoes. Additional individual and group
protective equipment should be adopted after an adequate analysis of the specific risks in the area of relevance, according
to the activities to be performed.
electrical
components
Never work on electrical components until the machine
’s main power supply has been cut off with
the main switch on the electrical panel. Wait 10 minutes after cutting off the machine
’s power
supply before opening the electrical panel, to prevent the risk of high voltage due to firing of the
capacitors.
refrigerating
system
The following precautions should be taken before working on the refrigerant circuit:
•
obtain permit for hot work (if required);
•
ensure that no flammable materials are stored in the work area and that no ignition sources
are present anywhere in the work area;
•
ensure that suitable fire extinguishing equipment is available;
•
ensure that the work area is
properly ventilated
before working on the refrigerant circuit or
before welding, brazing or soldering work;
•
ensure that the leak detection equipment being used is no sparking, adequately sealed or
intrinsically safe;
•
ensure that all maintenance staff have been instructed;
•
always perform the following procedure before working on the refrigerant circuit:
•
remove refrigerant (specifying residual pressure);
•
purge circuit with
inert gas
(e.g. nitrogen);
•
evacuate at a pressure of 0.3 bar (ass.) (or 0.03 MPa);
•
purge circuit with
inert gas
(e.g. nitrogen) again;
•
open the circuit.
If compressors or compressor oils are to be removed, it should be ensured that it has been
evacuated to an acceptable level to ensure that there is no flammable refrigerant remaining within
the lubricant.
Only refrigerant recovery equipment designed for use with flammable refrigerants should
be employed.
If the national rules or regulations permit the refrigerant to be drained, this should be done safely,
using a hose, for example, through which the refrigerant is discharged into the outside atmosphere
in a safe area. It should be ensured that an inflammable explosive refrigerant concentration cannot
occur near an ignition source or penetrate into a building under any circumstance.
In the case of refrigerating systems with an indirect system, the heat transfer fluid should be
checked for the possible presence of refrigerant.
After any repair work, the safety devices, for example refrigerant detectors and mechanical
ventilation systems, should be checked and the results recorded.
It should be ensured that any missing or illegible label on components of the refrigerant circuit is
replaced.
Sources of ignition should not be used when searching for a refrigerant leak.
Содержание EWYT021CZI-A1
Страница 51: ...D EIMHP01505 22_00EN 51 59 Figure 26 Refrigerant circuit P ID diagram for DUAL circuit EWYT CZ outdoor unit...
Страница 54: ...D EIMHP01505 22_00EN 54 59 Figure 28 Labels on the outdoor unit Figure 29 Labels on the indoor unit...
Страница 55: ...D EIMHP01505 22_00EN 55 59 Figure 30 Labels on the indoor unit Electric panel side...
Страница 58: ...Notes...
