Nobu AK-20L User Manual page 11

WARNINGS (for using R290/R32 refrigerant only)
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
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.
8. Checks to the refrigeration 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 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;
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; this shall be done in a safe manner to avoid possibility of
sparking;
--that there no live electrical components and wring are exposed while charging, recovering
or purging the system;
--that there is continuity of earth bonding.
7. 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. If it is absolutely
necessary to have an electrical supply to equipment during servicing, then a permanently
operating form of leak detection shall be located at the most critical point to warn of a
potentially hazardous situation.
Particular attention shall be paid to the following to ensure that by working in electrical
components, the casing is not altered in such a way that level of protection is affected. This
shall include damage to cables, excessive numble of connection, terminals not made to
original specification, damage to seals, incorrect fitting of glands, etc.
Ensure that seals or sealing materials have not degraded such that they no longer serve the
purpose of preventing the ingress of flammable atmospheres. Replacement parts shall be in
accordance with the manufacturer's specifications,
NOTE The use of silicon sealant may inhibit the effectiveness of some types of leak detection
equipment. Intrinsically safe components do not have to be isolated prior to working on
them.
8. Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance loads to the circuit without ensuring
that this will not exceed the permissible voltage and current permitted for the equipment in
use.
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