Equipment And Components Under Pressure; Maintenance Safety Considerations - Carrier Aquaforce 30XA302 Installation, Operation And Maintenance Instructions

All factory-installed relief valves are lead-sealed to prevent
any calibration change. If the relief valves are installed
on a change-over manifold, 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 (locate the control element in the
stop position).
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.
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.
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 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 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 "11.2 - Pressure vessels".
1.3 - Maintenance safety considerations
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 compo-
nents must be authorized, trained and fully qualified to do so.
All refrigerant circuit repairs 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.
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.
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 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.
Applicable Verification
national Organism
regulations
5