5
OPERATING AND MAINTENANCE MANUAL
Chapter 2
- Safety
NRC0020-0200 UL
The data in this manual are not binding and may be changed by the manufacturer without notice.
Reproduction of this manual, even partial, is strictly prohibited.
Systems that may contain oil must be completely drained and flushed, for example, with steam, before performing any operation.
Do not weld or modify a container that may be subject to pressurisation.
To prevent an increase in working temperature and pressure values check and clean the heat exchange surfaces (e.g. the fins of condensers) regularly.
For all dryers establish a convenient time interval for cleaning procedures.
Never use an open flame as a light source to inspect parts of the dryer.
Before dismantling parts of a unit ensure that all mobile and heavy parts are securely fixed, and ensure electrical power has been disconnected.
When a repair has been completed make sure that no tools, detached parts or rags are left in the dryer.
Check the direction of rotation of the electrical motors (in particular three-phase fans) when starting the unit for the first time after work has been
performed on the electrical connections or on the power supply sectioning device.
All the protections must be refitted following maintenance or repair work.
Do not use inflammable liquids to clean components while the dryer is running.
If non-inflammable hydrocarbons containing chlorine are used all the relevant safety precautions must be adopted to protect against the toxic
fumes that may be given off.
Before removing any panels or dismantling any parts of the unit perform the following steps:
•
Isolate the unit from the electrical power supply by disconnecting the supply upstream of the power feeding line.
•
Lock out the breaker (if present) in the “OFF” position by fitting a padlock.
•
If an 0/1 switch is present,
i.e. not a sectioning device
, ensure the breaker upline from the unit has been locked out in the “OFF”
position by means of a padlock. The breaker must be sized in compliance with the indications of the electrical diagram.
•
Attach a warning label to the main switch (if present) reading: "WORK IN PROGRESS - DO NOT SWITCH ON".
•
Do not set the electrical power switch to ON or attempt to start the unit if the warning label is attached.
Colored 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 . 3
R e f r i g e r a n t g a s e s
The units can be charged only with R134a.
The use and storage of cylinders containing refrigerants must be in compliance with the prescriptions of the manufacturers of the cylinders and in
compliance with the applicable safety laws and prescriptions in force in the place of installation.
2.3.1 Characteristics of R134a refrigerant
At normal temperature and pressure conditions, this is a class A1 colourless gas (classification EN 378-1).
Concentrations significantly above 1000 ppm v/v can cause narcotic effects.
In the event of leakages provide adequate ventilation of the room before entering.
Содержание NRC0020-0200 UL
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