POWERCIAT LX ST/HE/XE EN-4
1 - INTRODUCTION
PowerCiatTM LX ST/HE/XE units are designed to cool water for
the air conditioning of buildings or for industrial processes.
Prior to the initial start-up of LX units, the persons responsible
for the on-site installation, start-up, operation, and maintenance
of this unit should be thoroughly familiar with these instructions
and the technical characteristics for the project, specic to the
installation site.
They are designed for an operating life of 15 years by assuming
a 57 % utilisation factor; that is approximately 75,000 operating
hours.
LX liquid chillers are designed to provide a very high level of
safety during installation, start-up, operation 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.
Always ensure that all required safety measures are followed,
including those in this document, such as, wearing protective
clothing (gloves, ear defenders, safety glasses and shoes), using
appropriate tools, employing qualied and skilled technicians
(electricians, refrigeration engineers) and following local
regulations.
To nd 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,
qualied 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 le a
claim with the shipping company.
CIAT strongly recommends employing a specialised
company to unload the machine.
Do not remove the skid or the packaging until the unit is in
its nal 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.
These units are not designed to be lifted from above. Use
slings with the correct capacity, and always follow the lifting
instructions on the certied drawings supplied with the unit.
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.
DO NOT COVER ANY PROTECTION DEVICES.
This applies to fuse plugs and relief valves (if used) in the
refrigerant or heat transfer medium circuits. Check if the
original protection plugs are still present at the valve outlets.
These plugs are generally made of plastic and should not
be used. If they are still present, please remove them. Install
devices at the valve outlets or drain piping that prevent the
penetration of foreign bodies (dust, building debris, etc.)
and atmospheric agents (water can form rust or ice). These
devices, as well as the drain piping, must not impair
operation and not lead to a pressure drop that is higher than
10% of the control pressure.
Classication 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
classied as follows:
Safety
accessory(1)
Damage limitation accessory
in case of an external re (2)
Refrigerant Side
High pressure switch x
External relief valve(3)
x
Heat transfer uid side
External relief valve (4) (4)
(1) Classied for protection in normal service situations.
(2) Classied for protection in abnormal service situations. These accessories
are sized for res with a thermal ow of 10kW/m². No combustible matter
should be placed within 6.5m of the unit.
(3) The instantaneous overpressure limitation of 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.
(4) The selection of these relief valves must be made by the personnel responsible
for completing the hydraulic installation.
Do not remove these valves and fuses, even if the re risk
is under control for a particular installation. There is no
guarantee that the accessories are re-installed if the
installation is changed or for transport with a gas charge.
When the unit is subjected to re, safety devices prevent
rupture due to over-pressure by releasing the refrigerant.
The uid may then be decomposed into toxic residues when
subjected to the ame:
• Stay away from the unit.
• Set up warnings and recommendations for personnel in
charge to stop the re.
• Fire extinguishers appropriate to the system and the
refrigerant type must be easily accessible
All factory-installed relief valves are lead-sealed to prevent
any calibration change. 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.
The external relief valves must always be connected to drain
pipes for units installed in a closed room. Refer to the
installation regulations, for example those of European
standard EN 378 and EN 13136.
