Equipment And Components Under Pressure; Maintenance Safety Considerations - Carrier AquaSnap 30RB Series Installation, Operation And Maintenance Instructions

Do not remove these valves and fuses, even if the fire risk
is under control for a particular installation. There is no
guarantee that the accessories are re-installed if the instal-
lation is changed or for transport with a gas charge.
All factory-installed safety valves are lead-sealed to prevent
any calibration change.
The external safety 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.
These pipes must be installed in a way that ensures that
people and property are not exposed to refrigerant leaks.
As the fluids can be diffused in the air, ensure that the outlet
is far away from any building air intake, or that they are
discharged in a quantity that is appropriate for a suitably
absorbing environment.
Safety valves must be checked periodically. See paragraph
"Repair safety considerations".
Provide a drain in the drain pipe, close to each safety valve,
to avoid an accumulation of condensate or rain water.
All precautions concerning handling of refrigerant must
be observed in accordance with local regulations.

1.3 - Equipment and components under pressure

These products incorporate equipment or components under
pressure, manufactured by Carrier or other manufacturers.
We recommend that you consult your appropriate national
trade association or the owner of the equipment or compo-
nents under pressure (declaration, re-qualification, retesting,
etc.). The characteristics of this equipment/these components
are given on the nameplate or in the required documentation,
supplied with the products.
These units comply with the European Pressure Equipment
Directive.

1.4 - Maintenance safety considerations

Engineers working on the electric or refrigeration compo-
nents must be authorized, trained and fully qualified to do so.
All refrigerant circuit work must be carried out by a trained
person, fully qualified to work on these units. He must have
been trained and be familiar with the equipment and the
installation. All welding operations must be carried out by
qualified specialists.
Aquasnap Puron units use high-pressure R-410A refrigerant
(the unit operating pressure is above 40 bar, the pressure at
35°C air temperature is 50% higher than for R-22). Special
equipment must be used when working on the refrigerant
circuit (pressure gauge, charge transfer, etc.).
Any manipulation (opening or closing) of a shut-off valve
must be carried out by a qualified and authorised engineer,
observing applicable standards (e.g. during draining opera-
rations). The unit must be switched off during all operations.
NOTE: The unit must never be left shut down with the
liquid line valve closed, as liquid refrigerant can be trapped
between this valve and the expansion device and lead to
the risk of a pressure increase. This valve is situated on
the liquid line before the filter drier box.
During any handling, maintenance and service operations
the engineers working on the unit must be equipped with
safety gloves, glasses, shoes and protective clothing.
Never work on a unit that is still energized. Never work
on any of the electrical components, until the general
power supply to the unit has been cut.
If any maintenance operations are carried out on the unit,
lock the power supply circuit in the open position ahead
of the machine.
If the work is interrupted, always ensure that all circuits
are still deenergised before resuming the work.
ATTENTION: Even if the unit has been switched off, the
power circuit remains energised, unless the unit or circuit
disconnect switch is open. Refer to the wiring diagram for
further details. Attach appropriate safety labels.
It is recommended to install an indicating device to show
if part of the refrigerant has leaked from the valve. The
presence of oil at the outlet orifice is a useful indicator that
refrigerant has leaked. Keep this orifice clean to ensure that
any leaks are obvious. The calibration of a valve that has
leaked is generally lower than its original calibration. The
new calibration may affect the operating range. To avoid
nuisance tripping or leaks, replace or re-calibrate the valve.
OPERATINg ChECKS:
• IMPORTANT INfORMATION REgARDINg
ThE REfRIgERANT USED:
This product contains fluorinated greenhouse gas
covered by the Kyoto protocol.
Refrigerant type: R410A
global Warming Potential (gWP): 1975
Periodic inspections for refrigerant leaks may be
required depending on European or local legislation.
Please contact your local dealer for more information.
• During the life-time of the system, inspection and tests
must be carried out in accordance with national
regulations.
Protection device checks:
• If no national regulations exist, check the protection
devices on site in accordance with standard EN378:
once a year for the high-pressure switches, every five
years for external safety valves.
• Check manual "30RB/RQ Pro-Dialog Plus control"
for a detailed explanation of the high-pressure switch
test method.
If the machine operates in a corrosive environment, inspect
the protection devices more frequently.
Regularly carry out leak tests and immediately repair any
leaks.
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