Equipment And Components Under Pressure; Maintenance Safety Considerations - Carrier AquaForce 30XBE 250 Installation, Operation And Maintenance Instructions

1 - INTRODUCTION
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.
Periodic check of the relief valves: See chapter 1.3 -

"Maintenance safety considerations".

Provide a drain in the drain pipe, close to each relief valve,
to avoid an accumulation of condensate or rain water.
It is recommended to install an indicating device to check
whether 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.
All precautions concerning handling of refrigerant must be
observed in accordance with local regulations.
Ensure good ventilation, as accumulation of refrigerant in an
enclosed space can displace oxygen and cause asphyxiation
or explosions.
Inhalation of high concentrations of vapour is harmful and
may cause heart irregularities, unconsciousness, or death.
Vapour is heavier than air and reduces the amount of oxygen
available for breathing. These products cause eye and skin
irritation. Decomposition products are hazardous.

1.2 - 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 components 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
These units are intended to be stored and operated in an
environment where the ambient temperature must be not less
than the lowest allowable temperature 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 in the heat exchange circuits.
See section "12.2 - Pressure vessels".
1.3 - Maintenance safety considerations
If the unit is running, hearing protection is required for any
intervention in its vicinity.
Carrier recommends the following drafting for a logbook (the table
below should not be considered as reference and does not involve
Carrier responsibility):
Intervention Name of the
commissioning
Date Nature
(1)
engineer
(1) Maintenance, repairs, regular verifications (EN 378), leakage, etc.
Engineers working on the electric or refrigeration components
must be authorized, trained and fully qualified to do so.
All refrigerant circuit repairs must be carried out by a trained
6
Applicable
Verification
national
Organism
regulations
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.
Any manipulation (opening or closing) of a shut-off valve must
be carried out by a qualified and authorised engineer. These
procedures must be carried out with the unit shut-down.
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.
Equip the engineers that work on the unit as follows:
Personal protection
equipment (PPE)
(1)
Handling
Protective gloves,
eye protection,
safety shoe,
protective clothing.
Ear protection.
Filtering respirator.
(1) We recommend to follow the instructions in EN 378-3.
(2) Performed in the presence of A1 refrigerant according to EN 378-1.
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 using the
disconnect switch(es) in the control box(es).
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 deenergized before resuming the work.
ATTENTION: Even if the unit has been switched off, the power
circuit remains energized, unless the unit or circuit disconnect
switch is open. Refer to the wiring diagram for further details.
Attach appropriate safety labels.
Units with option 231 are equipped with capacitor batteries
with a discharge time of five (5) minutes after disconnecting
the power. After disconnecting the power to the control box,
wait five minutes before opening the control box. Before any
intervention, verify that there is no voltage present at any
accessible conducting parts of the power circuit.
Operating checks:
Important information regarding the refrigerant used:
- This product contains fluorinated greenhouse gas
covered by the Kyoto protocol.
Fluid type: R134a
Global Warming Potential (GWP): 1430, following AR4
Operations
Maintenance, Welding or
service brazing
X X
X
(2)
X
X
X