When the unit is subjected to fire, safety devices prevent
rupture due to over-pressure by releasing the refrigerant.
The fluid may then be decomposed into toxic residues when
subjected to the flame:
-
Stay away from the unit.
-
Set up warnings and recommendations for personnel in
charge to stop the fire.
-
Fire extinguishers appropriate to the system and the
refrigerant type must be easily accessible.
All factory-installed relief valve are lead-sealed to prevent
any calibration change.
The external relief valve 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. Relief valve must be checked
periodically. See paragraph “Repair safety considerations”.
If the relief valves are installed on a reversing valve
(changeover), this is equipped with a relief valve on each of
the two outlets. Only one of the two relief valve is in
operation, the other one is isolated. Never leave the
reversing 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 reversing valves installed in the unit.
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.
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 can be hazardous.
1.3 - Equipment and components under
pressure
These products incorporate equipment or components under
pressure, manufactured by CIAT 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.
The units are intended to be stored and operate in an environment
where the ambient temperature must not be 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.
1.4 - Maintenance safety considerations
CIAT recommends the following drafting for a logbook (the table
below should not be considered as reference and does not
involve CIAT responsibility):
Intervention
Name of the
commissioning
engineer
Applicable
national
regulations
Verification
Organism
Date
Nature
(1)
(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 (e.g.
electricians trained and qualified in accordance with IEC 60364
Classification BA4).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.
TD units use refrigerant R-407C. 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
operations). The unit must be switched off while this is done.
Equip the engineers that work on the unit as follows:
Personal protection equipment
(PPE)
(1)
Operations
Handling
maintenance,
service
Welding or
brazing
(2)
Protective gloves,
eye protection,
safety shoe,
protective clothing.
X
X
X
Ear protection.
X
X
Filtering respirator.
X
(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.
If any maintenance operations are carried out on the unit,
lock the power supply circuit in the open position and secure
the machine upstream with a padlock.
If the work is interrupted, always ensure that all circuits are
still deenergized before resuming the work.
Even if the unit has been switched off, the power
circuit remains energized, unless the unit or circuit
disconnect switch is open, and remote start-up is
still possible.
Refer to the wiring diagram for further details. Attach
appropriate safety labels.
If any work is carried out in the fan area, specifically
if the grilles or casings have to be removed, cut the
power supply to the fans to prevent their operation.
It is also rcommended to block the rotation of the
blades during the work.
1 - INTRODUCTION
EN-5
AQUACIAT
CALÉO™
TD
