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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.
Provide a drain in the discharge duct, close to each 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 Pressure equipment and components
These products incorporate equipment or components under pressure,
manufactured by Carrier or other manufacturers. We recommend
that you contact your professional body to find out which regulations
affect you as the operator or owner of pressure equipment or
components (declaration, re-qualification, re-testing, etc.).The
characteristics of this equipment/these components are given on the
name plate or in the regulatory documentation supplied with the
products.
These units comply with the European Pressure Equipment
Directive.
The units are intended to be stored and operated in an
environment where the ambient temperature is always within
the allowable temperature range indicated on the nameplate.
Do not introduce significant static or dynamic pressure with regard
to the operating pressures used during operation, or for tests in
the refrigerant circuit or heat exchange circuits.
NOTE: Monitoring during operation, re-qualification, re-testing
and re-testing dispensation:
•
Follow regulations on the monitoring of pressure equipment.
•
The user or the operator is usually required to create and
maintain a monitoring and maintenance register.
•
In the absence of any regulations, or in addition to the
regulations, follow the guidance in EN 378.
•
Follow the local professional recommendations, whenever
they exist.
•
Regularly inspect the surface of the components for signs
of corrosion. To do this, check an uninsulated part of the
component or check for an accumulation of rust at the
insulation joints.
•
Regularly check for the presence of any impurities (e.g.
sand, grit) in the heat transfer fluids. These impurities can
cause wear and/or pitting corrosion.
•
Install filters in the heat transfer fluid piping.
•
The reports from the regular checks carried out by the
user or operator must be included in the monitoring and
maintenance register.
Repair:
Any repair or modification of a pressurised container is
prohibited.
Only the replacement of the container with an original
manufacturer component is authorised. In this case, the
replacement must be carried out by a qualified operator.
The replacement of the vessel must be entered in the monitoring
and maintenance register.
Recycling:
The pressure equipment can be recycled in whole or in part.
After use, they may contain refrigerant vapours and oil residue.
Some parts are painted.
1.4 - Maintenance safety considerations
Carrier recommends the following table as a guide to completing the
monitoring and maintenance register (logbook) required by EN
378-2:
Intervention
Name of the
commissioning
Date Nature
(1)
engineer
Maintenance, repairs, regular verifications (EN 378), leakage, etc.
(1)
Engineers working on the electrical or refrigeration components
must be authorised, trained and fully qualified to do so. All work
on the refrigerant circuit must be carried out by a trained person,
fully qualified to work on these units. He/she must have been
specifically trained on this equipment and system. All welding
operations must be carried out by qualified specialists.
30RQM/30RQP units use high pressure R-410A refrigerant (the
unit operating pressure is above 40 bar; the pressure at an air
temperature of 35°C is 50% higher than for R-22). Special
equipment must be used when working on the refrigerant circuit
(pressure measurement, charge transfer, etc.).
Do not clean the unit with hot water or steam. This may cause
the refrigerant pressure to rise.
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 operations). The unit
must be switched off during maintenance.
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.
During any handling, maintenance and service operations, the
technicians working on the unit must be equipped with safety
gloves, glasses, shoes and insulated 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 isolated.
Lock the power supply circuit upstream of the unit in the open
position during maintenance interventions.
If work is interrupted for any reason, check that all circuits are
powered off before resuming work.
CAUTION: Even if the unit has been shut down, the power circuit
remains energized, unless the unit or circuit disconnect switch is
open. Refer to the wiring diagram for further details. Follow the
appropriate safety guidelines. When working on the fan deck,
particularly if the discharge grilles have been removed, isolate the
power supply to the fans to prevent their operation.
CAUTION: The option Power factor (231) and the variable frequency
drives (VFD) fitted to the 30RQP units and the units with options
116V, 116W or 28 have capacitor banks whose discharge time is
five (5) minutes after disconnecting the power supply.
After disconnecting the power supply to the electrical box, wait for
5 minutes before accessing the electrical box or variable drives.
Before any intervention, verify that there is no voltage present on
any accessible conducting parts of the power circuit.
It is recommended that an indicating device be installed to check
if any refrigerant has leaked from the relief 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.
Applicable national
Verified by
regulations
(organisation)
5
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