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by a short circuit in a motor or freezing of the BPHE), remove
the complete charge using a recovery unit and store the
refrigerant in mobile containers. The compressors cannot transfer
the whole refrigerant charge and can be damaged if used to
pump-down. The refrigerant charge should not be transferred
to the high-pressure side.
Detect and repair the leak, and recharge the circuit with the full
charge of R410A indicated on the unit's nameplate. Do not top
up the refrigerant charge. Only charge liquid refrigerant R-410A
at the liquid line.
Check the type of refrigerant before adding the full charge to
the machine.
Charging any refrigerant other than the original type (R410A)
will impair machine operation and can even cause irreparable
damage to the compressors. The compressors operating with
this refrigerant type are lubricated with a synthetic polyolester
oil.
Before any intervention on the refrigerant circuit, the complete
refrigerant charge must be recovered.
RISK OF EXPLOSION:
Never use air or a gas containing oxygen during leak tests to
purge ductwork or to pressurise a unit. Pressurised air mixtures
or gases containing oxygen can be the cause of an explosion.
Oxygen reacts violently with oil and grease.
Only use dry nitrogen for leak tests, with an appropriate tracer
gas if necessary.
If the recommendations above are not observed, this can have
serious or even fatal consequences and damage the installations.
Never exceed the specified maximum operating pressures.
Check the maximum permissible test pressures on the high and
low pressure sides, consulting the instructions in this manual
and the pressures indicated on the unit's nameplate.
Do not unweld the refrigerant ductwork or any refrigerant
circuit component or cut these with a torch until all refrigerant
(liquid and vapour) as well as the oil have been removed from
the heat pump. Traces of vapour should be displaced with dry
nitrogen. Refrigerant in contact with an open flame produces
toxic gases.
The necessary protective equipment must be available, and
appropriate fire extinguishers for the system and the refrigerant
type used must be within easy reach.
Do not siphon refrigerant.
Avoid spilling liquid refrigerant on skin or splashing it into
the eyes. Use safety goggles and safety gloves. Wash any fluid
spills from the skin with soap and water.
If refrigerant enters the eyes, immediately flush the eyes
thoroughly with water and consult a doctor.
Any accidental release of refrigerant, whether this is caused by a
small leak or significant discharges following the rupture of a pipe
or an unexpected release from a safety valve, can cause frostbites
and burns to personnel exposed. Do not ignore such injuries.
Installers, owners and especially service engineers for these units
must:
–
Create a procedure to ensure medical attention is
sought before treating such injuries;
–
Provide first-aid equipment, including equipment for
treating eye injuries.
We recommend that standard EN 378-3 Annex 3 is applied.
Never apply an open flame or live steam to a refrigerant
container. This can result in dangerous overpressure.
During refrigerant removal and storage operations, follow applicable
regulations. These regulations, permitting conditioning and recovery
of halogenated hydrocarbons under optimum quality conditions for
the products and optimum safety conditions for people, property and
the environment are described in standard NF E29-795. Any refrigerant
transfer and recovery operations must be carried out using a suitable
transfer unit. 3/8" SAE connectors on the liquid, suction and discharge
lines are available on all units for connection to the transfer unit. The
units must never be modified to add refrigerant and oil charging,
removal and purging devices. All these devices are factory fitted on the
units. Please refer to the certified dimensional drawings for the units.
It is dangerous and illegal to re-use disposable (non-returnable)
cylinders or attempt to refill them. When cylinders are empty,
evacuate the remaining gas pressure, and move them to a
designated place for recovery. Do not incinerate.
Do not attempt to remove components fitted to the refrigerant
circuit or fittings while the machine is under pressure or while it
is running. Check that there is zero pressure in the circuit and that
the unit has been shut down and deenergized before removing
components or opening a circuit. When the refrigerant circuit is
opened to carry out a repair, see the blanketing recommendations
in the paragraph on "Maintenance safety considerations" .
Do not attempt to repair or recondition a valve if there has
been any corrosion or build-up of foreign material (rust, dirt,
scale, etc.) on the valve body or mechanism. If necessary, replace
the device.
Do not install relief valves in series or backwards.
CAUTION: No part of the unit must be used as a walkway,
rack or support. Periodically check and repair or, if necessary,
replace any component or piping that shows signs of damage.
The ducts can break under the pressure and release refrigerant,
causing injuries.
Do not climb on a machine. Use a platform to work at height.
Use mechanical lifting equipment (crane, hoist, winch, etc.) to
lift or move heavy components.
For lighter components, use lifting equipment if there is any
risk of slipping or losing your balance.
Use only original replacement parts for any repair or component
replacement. Consult the list of replacement parts that
corresponds to the original equipment's specifications.
Do not drain the heat transfer fluid circuit without informing
the installation site technical maintenance department or other
competent body first.
Close the shut-off valves on the water inlet and outlet and drain
the unit's hydraulic circuit before working on the components
installed on the circuit (screen filter, pump, water flow sensor,
etc.).
Periodically inspect all valves, fittings and pipes on the refrigerant
and hydraulic circuits to ensure that they do not show any signs of
corrosion or leaks.
It is recommended that ear defenders are worn when working
near the unit if it is running.
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