HOMCOM 823-052V80 Manual page 15

8. Checking refrigerating equipment
When replacing electrical components, ensure they are suitable for the intended
purpose and meet the correct specifications. Always adhere to the manufacturer's
maintenance and service guidelines. If unsure, seek assistance from the
manufacturer's technical department.
For systems using flammable refrigerants, the following checks should be
conducted:
• Confirm that the refrigerant charge is appropriate for the size of the room where
the refrigerant-containing parts are installed.
• Ensure the ventilation equipment and outlets are functioning properly and not
obstructed.
• If an indirect refrigeration circuit is used, check for the presence of refrigerant in
the secondary circuit.
• Ensure all signs on the equipment are visible and legible.
• Install refrigerating pipes or components in a location where they are unlikely to
come into contactwith corrosive substances, unless they are made of corrosion-
resistant materials or adequately protected against corrosion.
9. Checking electrical devices
During repair and maintenance of electrical components, conduct safety checks
and inspections. If a fault is found that could jeopardise safety, do not connect the
electrical supply until the issue is resolved. If an immediate repair is not possible
but the operation needs to continue, use a suitable temporary solution. Report this
to the equipment owner for awareness.
Initial safety checks must include:
• Safety discharging capacitors to prevent sparks.
• Ensure that no live electrical components or wiring are exposed during charging,
recovering or purging the system.
• Check for continuity of earth bonding.
10. When repairing sealed components:
• Disconnect all electrical supplies from the equipment before removing sealed
covers.
• If it is necessary to have an electrical supply during servicing, use a permanently
operating leak detection system at the most critical point to warn of potential
hazards.
• Pay close attention to avoid altering the casing in a way that affects its level of
protection. This includes avoiding damage to cables, excessive connections, non-
original terminals, seal damage and incorrect fitting of glands.
• Ensure secure mounting of the apparatus.
• Verify that seals or sealing materials have not degraded to the point where they no
longer prevent the entry of flammable atmospheres.
• Use replacement parts in accordance with the manufacturer's specifications.
11. For repairing intrinsically safe components:
• Do not apply permanent inductive or capacitance loads to the circuit without
confirming that it does not exceed the allowed voltage and current for the
equipment.
• Intrinsically safe components are the only ones that can be worked on while live in
the presence of a flammable atmosphere.
• Ensure that the test apparatus has the correct rating.
• Only replace components with parts specified by the manufacturer, as using other
parts may result in the ignition of refrigerant from a leak in the atmosphere.
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