9
2 - PRELIMINARY CHECKS
2.2.2 - Siting the unit
The machine must be installed in a place that is not accessible to the
public or protected against access by non-authorised persons.
In case of extra-high units the machine environment must
permit easy access for maintenance operations.
Always refer to the chapter 3 “Dimensions, clearances” to confirm
that there is adequate space for all connections and service
operations. For the centre of gravity coordinates, the position of the
unit mounting holes, and the weight distribution points, refer to
the certified dimensional drawing supplied with the unit.
The support points under the chassis must have at least the size
of the chassis opening at the lifting point (minimum 220 x 180 mm)
in order to prevent a deformation of the chassis.
Typical applications of these units are in refrigeration systems,
and they do not require earthquake resistance. Earthquake
resistance has not been verified.
CAUTION: Only use slings at the designated lifting points
which are marked on the unit.
Before siting the unit check that:
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The permitted loading at the site is adequate or that
appropriate strenghtening measures have been taken.
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The unit is installed level on an even surface (maximum
tolerance is 5 mm in both axes).
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There is adequate space above the unit for air flow and
to ensure access to the components.
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The number of support points is adequate and that they
are in the right places.
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The location is not subject to flooding.
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For outdoor installations, where heavy snowfall is likely
and long periods of sub-zero temperatures are normal,
provision has to be made to prevent snow accumulating
by raising the unit above the height of drifts normally
experienced.
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Baffles may be necessary to deflect strong winds. They
must not restrict air flow into the unit.
CAUTION: Before lifting the unit, check that all casing panels
are securely fixed in place. Lift and set down the unit with
great care. Tilting and jarring can damage the unit and impair
unit operation.
If 30XB units are hoisted with rigging, it is advisable to protect
coils against crushing while a unit is being moved. Use struts or
spreader bar to spread the slings above the unit. Do not tilt a unit
more than 15°.
WARNING: Never push or lever on any of the enclosure panels
of the unit. Only the base of the unit frame is designed to
withstand such stresses.
If a unit includes a hydraulic module (options 116B, C, F, G),
the hydraulic module and pump piping must be installed in a
way that does not submit it to any strain. The hydraulic module
pipes must be fitted so that the pump does not support the
weight of the pipes.
2.2.3 - Checks before system start-up
Before the start-up of the refrigeration system, the complete
installation, including the refrigeration system must be verified
against the installation drawings, dimensional drawings, system
piping and instrumentation diagrams and the wiring diagrams.
For these checks national regulations must be followed. If the
national regulation does not specify any details, refer to standard
EN 378 as follows:
External visual installation checks:
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Ensure that the machine is charged with refrigerant. Verify
on the unit nameplate that the ‘fluid transported’ is R134A
and is not nitrogen.
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Compare the complete installation with the refrigeration
system and power circuit diagrams.
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Check that all components comply with the design
specifications.
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Check that all protection documents and equipment
provided by the manufacturer (dimensional drawings,
P&ID, declarations etc.) to comply with the regulations
are present.
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Verify that the environmental safety and protection and
devices and arrangements provided by the manufacturer
to comply with the regulations are in place.
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Verify that all documents for pressure containers,
certificates, name plates, files, instruction manuals
provided by the manufacturer to comply with the
regulations are present.
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Verify the free passage of access and safety routes.
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Check that ventilation in the plant room is adequate.
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Check that refrigerant detectors are present.
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Verify the instructions and directives to prevent the
deliberate removal of refrigerant gases that are harmful
to the environment.
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Verify the installation of connections.
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Verify the supports and fixing elements (materials, routing
and connection).
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Verify the quality of welds and other joints.
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Check the protection against mechanical damage.
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Check the protection against heat.
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Check the protection of moving parts.
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Verify the accessibility for maintenance or repair and to
check the piping.
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Verify the status of the valves.
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Verify the quality of the thermal insulation and of the
vapour barriers.
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