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Serviceman warnings
11.7 Area ventilation
Before working on the system or performing hot operations, make sure the area is open or adequately ven-
tilated. Ventilation must be constant for the entire duration of the operation. Ventilation must be capable of
safely dispersing all refrigerant released and preferably expelling it outside into the atmosphere.
11.8 Controls on refrigeration equipment
When changing an electrical component, the new one must be suitable for the intended use and meet the
correct specifications. The manufacturer's maintenance and serviceman instructions must be followed in all
circumstances. When in doubt, consult the manufacturer's technical department. The following checks are
recommended for installations using flammable refrigerants:
• the charge volume must be suitable for the room volume and the intended use in which the components
containing the refrigerant are installed, see installation requirements in EN 378;
• ventilation devices and openings must open properly and not be obstructed;
• if an indirect refrigerant circuit is used, the presence of refrigerant in the secondary circuits must be
checked; the equipment markings must remain visible and legible;
• markings and indications that become illegible shall be corrected;
• pipes or other components of the refrigerant circuit shall be installed in locations where exposure to po-
tentially corrosive substances is unlikely for components containing the refrigerant, unless they are made
of materials inherently resistant to corrosion or adequately protected against the risk of corrosion.
11.9 Controls on electrical devices
The repair and maintenance procedures for electric components must include initial safety checks and com-
ponent inspection procedures. If a defect is found that may generate safety risks, the power supply to the
circuit must be interrupted until the problem is satisfactorily resolved. If the problem cannot be solved imme-
diately, but it is necessary to keep the system running, an appropriate temporary solution must be adopted.
The situation should be communicated to the owner of the equipment so that all persons concerned can be
duly informed.
Initial safety checks:
• check that the condensers are discharged: this procedure must be performed safely to avoid the
possibility of sparks;
• check that there are no live components or wires exposed while charging, restoring or venting the
system;
• check for interruptions in the earthing;
• check that the unit is not powered and if necessary disconnect the power supply before proceeding
with the next steps.
11.10 Repair of sealed components
While repairing sealed components, all electrical utilities must be disconnected from the equipment before
removing the sealing covers, etc. If it is absolutely necessary to have electrical power supply during the in-
tervention, a permanent leakage detection method must be set up at the most critical point that can signal
any potentially dangerous situations.
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