Introduction; Safety Considerations Related To Protection Devices - Carrier AQUASNAP 30RBM Series Installation, Operation And Maintenance Instructions

1 - INTRODUCTION

The units are intended to cool water for building air
conditioning or for industrial processes.
They are designed to provide a very high level of safety and
reliability, making installation, start-up, operation and
maintenance easier and safer.
They will provide safe and reliable service if used within their
application ranges.
They are designed to offer a service life of 15 years, assuming
a utilisation factor of 75%, which corresponds to approximately
100,000 operating hours.
Prior to the initial start-up of the units, everyone involved in
the works should be thoroughly familiar with these instructions
and with the characteristics of the installation site, and ensure
these are respected.
The procedures in this manual are arranged in the sequence
required for installation, start-up, operation and maintenance
of the units. Ensure that you follow them and that you take
the required safety precautions, including those listed in this
guide, which include wearing personal protective equipment
(gloves, safety glasses, safety shoes) and having the appropriate
tools, skills and qualifications (electrical, air conditioning, local
legislation).
To find out if these products comply with European directives
(machine safety, low-voltage, electromagnetic compatibility,
pressurised equipment, etc.) check the declarations of
conformity for these products.
1.1 - Safety considerations related to protection
devices
Do not obstruct any protective devices.
This applies to any fuse plugs, rupture discs and valves fitted
on the refrigerant or heat-transfer fluid circuits. Check
whether 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. Fit devices at the valve or drain piping outlets to 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 discharge piping, must not impair
operation and not lead to a pressure drop that is higher than
10% of the set pressure.
4
Classification and control:
In accordance with the Pressure Equipment Directive and
national usage monitoring regulations in the European Union,
the protective devices fitted to these units are classified as
follows:
Refrigerant side
High pressure switch
External relief valve
(3)
Rupture disk
Fusible plug
Heat transfer fluid side
External relief valve
(1) Classified for protection in normal service situations.
(2) Classified for protection in abnormal service situations. These accessories are sized for fires with
a thermal flow 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 set pressure can be higher than the operating pressure. In this case, either the design
temperature or the high pressure switch ensures that the operating pressure is not exceeded in
normal service situations.
(4) The classification of these relief valves must be made by the personnel responsible for completing
the hydraulic installation.
Do not remove valves/fusible plugs, even if the fire 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 fire, a safety device prevents
rupture due to over-pressure by releasing the refrigerant. The
fluid can then break down into toxic residues when in contact
with flames:
• Stay away from the unit;
• Ensure the personnel in charge of extinguishing the fire
are duly warned and issued with recommendations;
• Fire extinguishers appropriate to the system and the
refrigerant type must be easily accessible.
All factory-fitted relief valves are lead-sealed to prevent any
calibration change.
The external relief valves must always be vented to outside if
the units are installed in a closed space. Refer to the installation
regulations, for example those of European standard EN 378
and EN 13136. These pipes must be installed in a way that
ensures that people and property are not exposed to vented
refrigerant. As the fluids can be diffused in the air, ensure that
refrigerant is discharged away from building air intakes, or
into a sufficient quantity of suitable absorbent material. The
valves must be checked periodically.
If the relief valves are factory-fitted on a changeover 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 changeover valve in the
intermediate position, i.e. with both circuits open (move the
lever fully forwards or backwards depending on the output to
be isolated). If a valve is removed for checking or replacement,
make sure there is still a valve active on each of the changeover
valves installed on the unit.
Safety Device for limitation of damage in
device the event of an external fire
(1)
x
x
x
x
(4) (4)
(2)