SAFETY RULES FOR VACUUM PERFORMANCE ON UNITS
CONTAINING R32 GAS
These procedures can only be performed by specialized
technicians or qualified personnel.
The unit contains flammable R32 refrigerant gas. For this reason,
when it is necessary to intervene in the refrigeration system to
carry out repairs or for any other operation, the regulations in
force and the procedures in this manual must be strictly observed.
• The refrigerant system must be flushed with OFN (Oxygen free
Nitrogen) to make the unit safe. It may be necessary to repeat
the washing operation several times and until completely
clean. Do not use compressed air or oxygen for this operation.
• The washing of the refrigeration system must be performed by
interrupting the vacuum in the system with OFN (Oxygen free
Nitrogen) and continuing to fill the system until the operating
pressure is reached and then discharged into the atmosphere;
finally lower until empty. This process must be repeated until
the system is completely clean.
• When the OFN final charge is used, the system must be
discharged to atmospheric pressure to allow the work to take
place. This operation is absolutely mandatory and necessary if
you want to carry out brazing operations on the pipes.
• Make sure that the vacuum pump outlet is not located near
ignition sources and that there is good ventilation.
SAFETY RULES FOR REFRIGERANT DISPOSAL AND
RECOVERY
These procedures can only be performed by specialized
technicians or qualified personnel.
DISPOSAL
• For refrigerant recycling, analyze the refrigerant and oil
samples before the operation. Ensure the required power
before testing.
• Disconnect the power supply.
• Make sure that all PPE (personal protective equipment) comply
with the regulations in force.
• Make sure that all the devices used to remove the refrigerant
comply with the regulations in force.
• Draw the refrigerant from the circuit. If it is not possible to suck
from a single point, use other sockets to unload the system.
• Before performing these procedures, make sure the holding
tank is large enough.
• Fill the tank up to and not more than 80% of its capacity.
• Do not exceed the maximum pressure allowed by the tank
even if the working times are short.
• Once the discharge is complete, quickly close the valves and
remove the equipment used.
• Make sure that the refrigerant has been cleaned before using
it on other systems.
• The identification of the recovered refrigerant must be carried
out after the unit has been unloaded. The identification of the
refrigerant must contain the date and approval. Make sure that
the signs regarding the flammable refrigerant contained are
shown on the unit.
RECOVERY
• It is recommended that the coolant be removed completely.
• Before carrying out these procedures, make sure that the
containment tank is large enough to satisfy the system and
with the necessary signs. Furthermore, this tank must be
equipped with a relief valve and a globe valve kept in good
condition. The tank must be kept unloaded and at room
temperature before use.
• The equipment must be kept in good working condition and
equipped with instructions for use. The equipment must be
suitable for the recovery of R32 refrigerants, with certification
that can ascertain their use. The pipe must be connected with a
removable connection joint with zero leakage rate and be kept
in good condition. Before using the equipment, check that it is
in good condition and that it is perfectly maintained. Check if
the electrical components are sealed to avoid refrigerant leaks
and fires. If you have any questions, consult the manufacturer.
• The recovered refrigerant must be loaded into the appropriate
storage tanks, accompanied by transport instructions
and returned to the refrigerant manufacturer. Do not mix
refrigerant in recovery equipment, especially in a storage tank.
• If necessary, take anti-static measures during transport. In the
process of transport, loading and unloading, the necessary
protective measures must be taken to protect the unit and
ensure its safety.
• When removing the compressor or cleaning it of residual oil,
make sure that there are no R32 refrigerant residues. Vacuum
pumping must be done before the compressor is returned.
Ensure safety when draining oil from the system.
• Any problems with the installation or operation of the unit
resulting from failure to comply with the points listed in this
manual could cause damage to people, things, etc.
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