Preventive Maintenance - Structural Concepts OASIS C33R User Manual

PREVENTIVE MAINTENANCE - TO BE PERFORMED BY TRAINED SERVICE PROVIDERS ONLY - 1 of 7
WARNING! TURN OFF CASE BEFORE PERFORMING PREVENTIVE MAINTENANCE!
• All maintenance staff and others working in the local area shall be instructed on the nature of work
being carried out. Work in confined spaces shall be avoided.
• The area shall be checked with an appropriate refrigerant detector prior to and during work, to ensure
the technician is aware of potentially toxic or flammable atmospheres. Ensure that the leak detection
equipment being used is suitable for use with all applicable refrigerants, i.e., nonsparking, adequately
sealed, or intrinsically safe.
• If any hot work is to be conducted on the refrigerating equipment or any associated parts, appropriate
fire extinguishing equipment shall be available on hand. A dry chemical or CO
should be adjacent to the charging area.
• 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 keep sufficiently far away from the
site of installation, repairing, removing and disposal, during which refrigerant can possible be released
to the surround space. Prior to work taking place, the area around the equipment shall be surveyed to
make sure that there are no flammable hazards or ignition risks. "No Smoking" signs shall be dis-
played.
• Ensure that the area is in the open or that it is adequately ventilated before breaking into the system
or conducting any hot work. A degree of ventilation shall continue during the period that the work is
carried out. The ventilation should safely disperse any released refrigerant and preferably expel it ex-
ternally into the atmosphere.
Checks to the refrigerating equipment
• Where electrical components are being changed, they shall be fit for the purpose and to the correct
specification. At all times, the manufacturer's maintenance and service guidelines shall be followed. If
in doubt, consult the manufacturer's technical department for assistance.
• The following check shall be applied to installation using FLAMMABLE REFRIGERANTS:
a) the actual REFRIGERANT CHARGE is in accordance with the room size within which the re-
frigerant containing parts are installed;
b) the ventilation machinery and outlets are operating adequately and are not obstructed;
c) if an indirect refrigeration circuit is being used, the secondary circuit shall be checked for the
presence of refrigerant;
d) marking to the equipment continues to be visible and legible. Markings and signs that are illegi-
ble shall be corrected;
e) refrigerating pipe or components are installed in a position where they are unlikely to be ex-
posed 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:
a) that capacitors are discharged: this shall be done in a safe manner to avoid possibility of
sparking;
b) that no live electrical components and wiring are exposed while charging, recovering or purg-
ing the system;
c) that there is continuity of earth bonding.
Maintenance and Service Notes
16
fire extinguisher
2