CIAT DYNACIAT power LG Manuel D'instructions page 45

19.2.4 Refrigerants - general information
- Always remember that refrigeration systems contain
pressurised liquids and vapours.
- All necessary measures must be taken when partially opening
the system: Make sure that there is no pressure in the part of
the circuit concerned.
- Partial opening of the primary refrigerant circuit will cause
a certain quantity of refrigerant to be released into the
atmosphere.
- It is essential to keep the amount of lost refrigerant as low
as possible by pumping the charge and isolating it in another
part of the system.
- The refrigerant and lubricating oil, and the low-temperature
liquid refrigerant in particular, may cause inflammatory
lesions similar to burns if they come into contact with the skin
or eyes.
Always wear protective eyewear, gloves and other protective
equipment when opening pipes or tanks liable to have liquids
in them. Store unused refrigerant in the appropriate containers
and limit the amounts stored in mechanical rooms.
- Cylinders and tanks of refrigerant must be handled with care
and signs warning users of the related poisoning, fire and
explosion hazards must be clearly visible. Refrigerant that
reaches the end of its life must be collected and recycled in
accordance with applicable regulations.
19.2.5 Halocarbon and hydrofluorocarbon refrigerants
Although non-toxic, vapours
hydrofluorocarbon refrigerants are still hazardous because
they are heavier than air and can force the latter out of the
machine rooms.
If refrigerant is accidentally released, ventilate the room with
fans. Exposure levels in workplaces must be kept to a practical
minimum and must never exceed the recognised limit of 1000
ppm for an 8-hour working day and a 40-hour working week.
Although halocarbon and hydrofluorocarbon refrigerants are
not flammable, keep them away from open flames (e.g.
cigarettes, etc.), as temperatures of over 300°C cause
their vapours to break down and form phosgene, hydrogen
fluoride, hydrogen chloride and other toxic compounds. These
compounds may produce severe physiological consequences
if accidentally inhaled or swallowed.
Warning: Do not expose R410A, R407C vapours and zeotropic
blends of refrigerants containing R32 to open flames (such as
cigarettes). Refrigerants must be evacuated from pipes and
tanks before commencing any cutting or welding work. Do
not use a torch to check for leaks of refrigerants containing
halocarbons such as R410A, R407C and its by-products.
NOTE: The DYNACIAT
LG 700 V to 2400 V are machines
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that operate with R410A. It is essential that technicians use
equipment which is compatible with R410A with a working
pressure which is approximately 1.5 times higher than that of
units using R407C.
19.2.6 Servicing
- Note down the operating readings and perform the checks
indicated in the table on the previous page at least twice a
year and each time a unit is started up.
● Weekly checks
With the unit running at full capacity, check the following
values:
- Check the entire system for traces of water/oil under or around
the unit and for any unusual noises.
- LP compressor suction pressure,
- HP compressor discharge pressure,
- The water inlet and outlet temperatures in the exchangers
from halocarbon and
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- The charge via the liquid sight glass and the condition of the
charge using the coloured indicator on the sight glass
- The oil level and its appearance. If the colour changes, check
the quality.
- Keep the unit clean.
● Monthly checks
- Check all the values listed in the "Operating readings" table
on the previous page.
- Perform a corrosion check on all the metal parts. (Frame,
casing, exchangers, electrical boxes etc.)
- Make sure that the insulating foam is not detached or torn.
- Check the energy transfer fluids for any impurities which
could cause wear or corrosion in the exchanger.
- Check the circuits for leaks.
- Check every six months to ensure the safety devices and
expansion valve(s) are operating correctly.
● Annual checks
- Carry out the same
the monthly checks.
- Test the oil for contaminants: if acid, water or metal particles
are detected in the oil, replace it in the corresponding circuit
and the dryer.
- If the whole oil load is being changed, use only new oil of
the same grade as the original oil, which has been stored in
a hermetically sealed container until loading. Oil type: (see
section 12 Main components of the refrigerating circuit).
- Check the filter dryer for clogging (measure the difference
in the temperature of the pipes at the dryer inlet and outlet).
- Clean the water filter and vent air from the circuit.
- Clean the exchangers and check the pressure drop in each.
- Check the operation of the water flow switch.
- Check the water quality or condition of the coolant.
- Check the antifreeze concentration (MEG or PEG)
- Disconnect all the cables and check the insulation of the
motor and the resistance of the windings.
- Check the electrical connections to ensure they are tight and
in good condition.
- Check the condition of the contacts and the current at full load on
all three phases
- Check the electrical box for water seepage.
NB: The cleaning intervals are given as a guide and should be
adapted to each installation.
19.2.7 Disassembling the compressor
The compressor is fastened to the platform by four
dia. 8 mm screws.
Warning: Do not tighten these compressor screws to a torque
greater than 16 Nm ± 1 Nm for DYNACIAT
not have a torque wrench, tighten them until resistance is felt,
then tighten a further ¾ turn.
IMPORTANT:
To ensure your unit runs smoothly and to obtain service
under the warranty, take out a maintenance contract with
your installer or an approved maintenance company.
inspections as during
units. If you do
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