Sharp BU Series - Page 8

EN-6
REFRIGERANTS:
– the actual REFRIGERANT CHARGE is in accordance with the room size within
which the refrigerant containing parts are installed;
– the ventilation machinery and outlets are operating adequately and are not
obstructed;
– if an indirect refrigerating circuit is being used, the secondary circuit shall be
checked for the presence of refrigerant;
– marking to the equipment continues to be visible and legible. Markings and
signs that are illegible shall be corrected;
– refrigerating pipe or components are installed in a position where they
are unlikely to be exposed to any substance which may corrode refrigerant
containing components, unless the components are constructed of materials
which are inherently resistant to being corroded or are suitably protected against
being so corroded.
• Checks to electrical devices: Repair and maintenance to electrical components
shall include initial safety checks and component inspection procedures. If a fault
exists that could compromise safety, then no electrical supply shall be connected
to the circuit until it is satisfactorily dealt with. If the fault cannot be corrected
immediately but it is necessary to continue operation, an adequate temporary
solution shall be used. This shall be reported to the owner of the equipment so
all parties are advised.
Initial safety checks shall include:
– that capacitors are discharged: this shall be done in a safe manner to avoid
possibility of sparking;
– that no live electrical components and wiring are exposed while charging,
recovering or purging the system;
– that there is continuity of earth bonding.
• Sealed electrical components shall be replaced.
• Intrinsically safe components must be replaced.
• Cabling: Check that cabling will not be subject to wear, corrosion, excessive
pressure, vibration, sharp edges or any other adverse environmental e󰀨ects. The
check shall also take into account the e󰀨ects of aging or continual vibration from
sources such as compressors or fans.
• Removal and evacuation
When breaking into the refrigerant circuit to make repairs – or for any other
purpose – conventional procedures shall be used. However, for ammable
refrigerants it is important that best practice be followed, since ammability is a
consideration. The following procedure shall be adhered to:
a) safely remove refrigerant following local and national regulations;
b) evacuate;
c) purge the circuit with inert gas (optional for A2L);
d) evacuate (optional for A2L);
e) continuously ush or purge with inert gas when using ame to open circuit; and
f) open the circuit.
The refrigerant charge shall be recovered into the correct recovery cylinders if
venting is not allowed by local and national codes. For appliances containing
ammable refrigerants, the system shall be purged with oxygen-free nitrogen to
render the appliance safe for ammable refrigerants. This process might need
SAFETY PRECAUTIONS (Continued)