Structural Concepts Harmony HMBC2 User Manual page 15

Preventive Maintenance
Maintenance and Service Notes
WARNING! TURN OFF CASE BEFORE PERFORMING PREVENTATIVE 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., non-sparking, 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 CO2 fire extinguisher 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 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 shall be surveyed to make sure that there are no flammable hazards or ignition risks. "No Smoking" signs shall
be displayed.
• 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 externally 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 refrigerant 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 illegible shall be
corrected;
e. 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:
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 purging the system;
c. That there is continuity of earth bonding.
Harmony® User Manual 15