Toshiba MMU-UP0151SH-E Installation Manual page 10

3.General work area
• 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 around the workspace shall be sectioned off.
• Ensure that the conditions within the area have been made safe by
control of flammable material.
4.Checking for presence of refrigerant
• The area shall be checked with an appropriate refrigerant detector
prior to and during work, to ensure the technician is aware of
potentially 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.
5.Presence of fire extinguisher
• If any hot work is to be conducted on the refrigeration equipment or
any associated parts, appropriate fire extinguishing equipment shall
be available on hand.
• Have a dry powder or CO
area.
6.No ignition sources
• No person carrying out work in relation to a refrigeration 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 is to be
surveyed to make sure that there are no flammable hazards or
ignition risks. "No Smoking" signs shall be displayed.
7.Ventilated area
• 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.
17-EN
fire extinguisher adjacent to the charging
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8.Checks to the refrigeration equipment
• Where electrical components are being changed, installer 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 checks shall be applied to installations using flammable
refrigerants.
- The charge size 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.
- Refrigeration pipe or components are installed in a position where
hey 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.
9.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 to avoid possibility of sparking.
- That there no live electrical components and wiring are exposed
while charging, recovering or purging the system.
- That there is continuity of earth bonding.
10.Repairs to sealed components
• During repairs to sealed components, all electrical supplies shall be
disconnected from the equipment being worked upon prior to any
removal of sealed covers, etc.
18-EN