HTW A3 Serie Manual De Usuario E Instalacion página 39

refrigerant recovery cylinders). Cylinders shall be complete with pressure relief valve and
associated shut-off valves in good working order. Empty recovery cylinders are evacuated and,
if possible, cooled before recovery occurs.
Recovery equipment should be in good working order with a set of instructions relating to the
equipment available and suitable for the recovery of flammable refrigerants. In addition, there will
be a set of calibrated scales in good working order. Hoses shall be complete with disconnect
couplings that are leak free and in good condition. Before using the recovery machine, check that
it is in good working order, that it has been properly maintained
and that all associated electrical components are sealed to prevent ignition in the event of a
release of refrigerant. Consult the manufacturer if in doubt.
Leftover coolant will be returned to the coolant supplier with the corresponding waste transfer
note provided. Do not mix refrigerants in recovery units and especially not in cylinders.
If compressors or compressor oils are to be removed, ensure they have been evacuated to an
acceptable level to ensure that flammable refrigerant does not remain within the lubricant. The
evacuation process will be carried out before the compressor is returned to the suppliers. Only
electric heating to the compressor body will be used to speed up this process. When oil is drained
from a system, it will be done safely.
Competence of service personnel
General
Special training in addition to normal refrigeration equipment repair procedures is required when
equipment with refrigerants may be affected.
In many countries, this training is carried out by national training organizations that are accredited
to teach the relevant national competency standards that may be set out in legislation.
The competence achieved must be documented by means of a certificate.
Training
The training must include the content of the following:
Information on the explosion potential of flammable refrigerants to demonstrate that flammables
can be dangerous when handled carelessly.
Information about possible sources of ignition, especially those that are not obvious, such as
cigarette lighters, light switches, vacuum cleaners, electric heaters.
Information on the different security concepts:
Without ventilation – (see clause GG.2) The safety of the appliance does not depend on the
ventilation of the house. Switching off the device or opening the casing does not have a significant
effect on
safety. However, it is possible for leaking refrigerant to accumulate inside the
The enclosure and flammable atmosphere will be released when the enclosure is opened.
Ventilated enclosure – (see clause GG.4) The safety of the appliance depends on the ventilation of
the House. Switching off the device or opening the casing has a significant effect on security. Care
must be taken to ensure sufficient ventilation beforehand.
Ventilated room – (see clause GG.5) The safety of the appliance depends on the ventilation of
the room. Switching off the device or opening the casing does not have a significant effect on
safety. Room ventilation should not be turned off during repair procedures.
Information on the concept of sealed components and sealed enclosures according to IEC 60079-
15:2010.
Information on correct work procedures:
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