CIAT N 96.22 B Betriebs- Und Wartungsanleitungen Seite 8

The connecting pipes and regulation or isolating equipments
ust be carried out and supported so as to avoid any thrust,
torsion or stress on the coil piping.
In order to ensure that the tube bundle empties, check that
the unit is perfectly level. You should also confirm that it is
stable and secured at each anchor point.
Provide isolator valves to inlet and outlet nozzles.
For steel tube drycoolers, make sure that the liquid is not in
contact with the air (oxygen supply = corrosion)
When the temperature in the tubes exceeds 65° C,
place a sign on the ductwork warning of the risk of
burns.
It is absolutely essential that the equipment is fitted
with an emergency stop device in its immediate
proximity; this device s visible and accessable, hould
enable the unit and its accessories be totally isolated from the
electricity supply.
When the electricity supply is switched off, whether
accidentally or intentionally, make certain that it does not put
the process at risk.
Where there are accessories, refer to their specific guides.
If using speed variators others than the ones recommended
by CIAT, their compatibility with the electrical motors must be
checked.
Install efficient draining and venting devices
Provide an earth (a ground) for the pipework, taking into
account the overall scheme for protection against lightening
strikes.
Confirm that the installation fully complies with all norms and
codes current in the country concerned.
Electrical connections
Electrical connections should be made in accordance with
current standards and regulations, by a fully qualified person.
Provide devices to protect people and property, and to
enable maintenance to be undertaken in complete
safety.
Choose cables for power supply and control according to the
equipment's electrical
recommendations in manuals accompanying the accessories
(temperature probes, speed regulators, etc.).
When the unit is fitted with an electrical connection box
(generally the case), refer to the electrical diagrams in the box
when connecting it.
For dry-coolers with two lines of fans, where fan control is by
"run/stop", the motors should be controlled in pairs in one same
housing. E.g.:
M5 M6 M5 M6
M3 M4 M3 M4
M1 M2 M1 M2
YES YES
Cable runs should be made in accordance with good working
practice, using protective glands.
Water connections
The covers protecting the nozzle guarantee internal
cleanliness, only remove them immediately before the
pipework is to be connected.
Make connections in accordance with the direction of the
arrows marked on the inlet and outlet nozzles.
Where a soldered connection is made, take whatever
precautions are necessary to ensure that solder residues are
not left inside the circuit.
Never introduce foreign bodies into the circuit.
Refrigerant connections
(condenser)
It is vital that the pipework system is correctly designed and
installed : the proper operation of the whole system depends
on this. Refrigerant
links between the condenser and the machine inside, and also
leak tests, will be undertaken by a specialist according to a
method following good working practice and current
regulations.
characteristics and the
M5 M6
M5 M6
M3 M4
M3 M4
M1 M2 M1 M2
NO NO
Operating
initial start up
Carefully read the start up instructions for any possible
accessories and use the settings.
Confirm that the supply voltage is the same as that shown on
the electrical diagram.
If need be, tighten the lugs on the electrical box.
Switch the unit on and ensure that all fans rotate in the
correct direction (direction of rotation shown by stickers).
If there is abnormal noise at motor-fan level, switch off the
electricity supply at once and get in touch with your CIAT
representative.
Proceed with loading by purging the air remaining in the
circuit through the vents positioned in the upper part.
Proceed with bringing-up to pressure (always activate the
cooling fluid before the heating fluid), then confirm there are no
leaks at the nozzle connections.
If a problem arises
Your CIAT representative is there to give you whatever help you
need. However, you'll save time by checking the following
points :
Are all fans rotating in the right direction ? (Confirm by
comparing with the direction shown by the
stickers).
Is the supply voltage correct ?
Are motors rotating at the correct speed ?
(Check the current being drawn).
Did you reverse the fluid flows on connecting the coils ?
Have the coil fins been blocked ?
Is air being recycled or is the air supply poor ?
Recommendations on use
Scale build up and corrosion have an extremely adverse
effect on the unit's correct operation and life. Therefore only use
treated water (check that additives are compatible with the
dry-cooler's components).
After long term stops, we recommend that the motors are
heat dried to eliminate any traces of moisture in them.
Maintenance
Conseils de maintenance
Make absolutely certain that the equipment is
switched off before touching it.
To work on the bundle, lower the temperature and
pressure.
Only suitably qualified personnel should touch the
equipment.
Do not modify equipment without CIAT's approval.
Do not step directly on the unit.
According to the fluid type (e.g. water without antifreeze)
beware of the risk of freezing which destroys the tube bundle.
Some units cannot be totally emptied by gravity, so protect
against frost by :
1 - Emptying the circuit using the drains and vents
located on the collectors or pipework.
2 - Blowing compressed air until the water is completely
emptied.
3 - Closing the circuit again and filling the bundle
with antifreeze.
For controlled equipment, consider mandatory visits.
For drycoolers with expansion vessel, lower the
temperature before opening the filling cap (safety cap).
In winter, do not let snow accumulate around or on the unit.
From time to time, check the state of the protective
anti-corrosion coating, re-touching as necessary.
The category is indicated in accordance with the directive
97/23 CE (DESP) is mentioned in the specifications attached
to the order acknowledgment.
indicated on the nameplate.
9
The manufacturing year is