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1 - INTRODUCTION
Prior to the initial start-up of the 30HXC units, the people involved
in the on-site installation, start-up, operation and maintenance of
this unit should be thoroughly familiar with these instructions and
the specific project data for the installation site.
The 30HXC liquid chillers are designed to provide a very high
level of safety during installation, start-up, opera tion and
maintenance. They will provide safe and reliable service when
operated within their application range.
This manual provides the necessary information to familiarize
yourself with the control system before performing start-up
procedures. The procedures in this manual are arranged in the
sequence required for machine installation, start-up, operation
and maintenance.
Be sure you understand and follow the procedures and safety
precautions contained in the instructions supplied with the
machine, as well as those listed in this guide.
To find out, if these products comply with European directives
(machine safety, low voltage, electromagnetic compatibility,
equipment under pressure etc.) check the declarations of
conformity for these products.
1.1 - Installation safety considerations
Access to the unit must be reserved to authorised personnel,
qualified and trained in monitoring and maintenance. The access
limitation device must be installed by the customer (e.g. cut-off,
enclosure).
After the unit has been received, when it is ready to be installed
or reinstalled, and before it is started up, it must be inspected for
damage. Check that the refrigerant circuit(s) is (are) intact,
especially that no components or pipes have shifted (e.g. following
a shock). If in doubt, carry out a leak tightness check and verify
with the manufacturer that the circuit integrity has not been
impaired. If damage is detected upon receipt, immediately file a
claim with the shipping company.
Carrier strongly recommends employing a specialised company
to unload the machine.
It is compulsory to wear personal protection equipment.
Do not remove the skid or the packaging until the unit is in its
final position. These units can be moved with a fork lift truck,
as long as the forks are positioned in the right place and direction
on the unit.
The units can also be lifted with slings, using only the designated
lifting points marked on the unit.
Use slings or lifting beams with the correct capacity, and always
follow the lifting instructions on the certified drawings supplied
with the unit. Do not tilt the unit more than 15°.
Safety is only guaranteed, if these instructions are carefully
followed. If this is not the case, there is a risk of material
deterioration and injuries to personnel.
Never cover any protection devices.
This applies to the relief valves (if used) in the refrigerant or
heat transfer medium circuits, the fuse plugs and the pressure
switches.
Ensure that the valves are correctly installed, before operating
the unit.
Classification and control
In accordance with the Pressure Equipment Directive and
national usage monitoring regulations in the European Union
the protection devices for these machines are classified as follows:
Safety
accessory*
Damage limitation accessory**
in case of an external fire
Refrigerant side
High-pressure switch
x
External relief valve***
x
Rupture disk
x
Fuse plug
x
Heat transfer fluid side
External relief valve
****
****
* Classified for protection in normal service situations.
** Classified for protection in abnormal service situations.
*** The instantaneous over-pressure limited to 10% of the operating pressure
does not apply to this abnormal service situation. The control pressure can be
higher than the service pressure. In this case either the design temperature or
the high-pressure switch ensures that the service pressure is not exceeded in
normal service situations.
**** The classification of these relief valves must be made by the personnel that
completes the whole hydronic installation.
If the relief valves are installed on a change-over valve, this is
equipped with a relief valve on each of the two outlets. Only one
of the two relief valves is in operation, the other one is isolated.
Never leave the change-over valve in the intermediate position,
i.e. with both ways open (bring the actuator in abutment, front
or back according to the outlet to isolate). If a relief valve is
removed for checking or replacement please ensure that there
is always an active relief valve on each of the change-over valves
installed in the unit.
All factory-installed relief valves are lead-sealed to prevent any
calibration change.
The external relief valves and the fuses are designed and installed
to ensure damage limitation in case of a fire.
In accordance with the regulations applied for the design, the
European directive on equipment under pressure and in
accordance with the national usage regulations:
•
These relief valves and fuses are not safety accessories but
damage limitation accessories in case of a fire,
•
The high pressure switches are the safety accessories.
The relief valve must only be removed if the fire risk is fully
controlled and after checking that this is allowed by local regulations
and authorities. This is the responsibility of the operator.
Summary of Contents for 30HXC Series
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