7
The data inside this manual are not binding and they can be modified by the manufacturer without notice.
All rights reserved.
NPC 280 - 400
ATTENTION
Use only refrigerant gas specified on the specification plate of the unit.
Make sure that all instructions concerning operation and maintenance are strictly followed and that the complete unit, with all accessories and
safety devices, is kept in good working order. The accuracy of pressure and temperature gauges must be regularly checked. They must be
renewed when acceptable tolerances are exceeded.
ATTENTION
Do not weld or carry out any operation which produces heat near a system which contains oil or flammable liquids. The systems which may
contain oil or flammable liquids must be completely drained and cleaned (with steam, for example), before carrying out these operations.
The adjacent components must always be screened with non-flammable material and if the operation is to be carried out near any part of the
lubrication system, or close to a component which may contain oil, the system must first be thoroughly purged, preferably by steam cleaning.
Never use a light source with an open flame to inspect any part of the machine.
For every unit establish a suitable time schedule for cleaning operations.
ATTENTION
If replacement parts are needed use only original spares.
Avoid to damage the safety valves and other pressure relief devices.
All guards must be reinstated after carrying out repair or maintenance work.
ATTENTION
Check the direction of rotation of electric motors (the pump if installed) when starting up the unit initially and after any work on the
electrical connections or switch gear.
Do not use flammable liquid to clean any component during operation. If chlorinated hydrocarbon non-flammable fluids are used for cleaning,
safety precautions must be taken against any toxic vapours which may be released.
ATTENTION
Before removing any panels or dismantling any part of the unit, carry out the following operations:
- Isolate the unit from the main electrical power supply by disconnecting the cable from the electrical power source.
- Lock the isolator in the “OFF” position with a lock.
- Attach a warning label to the main isolator switch conveying: “WORK IN PROGRESS - DON NOT APPLY VOLTAGE”.
- Do not switch on electrical power or attempt to start the unit if a warning label is attached.
Coloured tracers can be used in service-maintenance operations.
Inspect all refrigerant circuit joints including connectors, flanges, and more generally all critical points (open joints) in order to prevent possible
leakage of refrigerant gas.
2 . 7
R e f r i g e r a n t g a s e s
R407C is used as refrigerant in these units. Never attempt to mix refrigerant gases. The manufacturer's instructions and local safety regulations
should always be observed when handling and storing high pressure gas cylinders.
2.7.1 Refrigerant safety sch ed ule
R407C
Denomination:
23% Difluoromethane (R32);
25% Pentafluoroethane (R125);
52% R134a
INDICATION OF THE DANGERS
Major dangers:
Asphyxia.
Specific dangers:
Rapid evaporation can cause freezing.
FIRST AID MEASURES
General information:
Do not give anything to unconscious persons.
Inhalation:
Take the person outdoors. Use oxygen or artificial respiration if necessary. Do not
administer adrenaline or similar substances.
Contact with the eyes:
Thoroughly wash with plenty of water for at least 15 minutes and call a doctor.
Contact with the skin:
Wash immediately with plenty of water. Remove contaminated clothing immediately.
FIRE-FIGHTING MEASURES
Means of extinction:
Any means.
