Removal And Evacuation; Charging Procedures - Beko BEVPCC 090 User Manual

2 Maintenance instruction
refrigerant-free area.) Ensure that the detector
is not a potential source of ignition and is
suitable for the refrigerant used. Leak detection
equipment shall be set at a percentage of the
LFL of the refrigerant and shall be calibrated to
the refrigerant employed, and the appropriate
percentage of gas (25 % maximum) is confirmed.
Leak detection fluids are suitable for use with
most refrigerants but the use of detergents
containing chlorine shall be avoided as the
chlorine may react with the refrigerant and
corrode the copper pipe-work.
If a leak is suspected, all naked flames shall be
removed/extinguished.
If a leakage of refrigerant is found which requires
brazing, all of the refrigerant shall be recovered
from the system, or isolated (by means of shut
off valves) in a part of the system remote from
the leak. For appliances containing flammable
refrigerants, oxygen free nitrogen (OFN) shall
then be purged through the system both before
and during the brazing process.

2.8 Removal and evacuation

When breaking into the refrigerant circuit
to make repairs – or for any other purpose –
conventional procedures shall be used. However,
for flammable refrigerants it is important that
best practice is followed since flammability is a
consideration. The following procedure shall be
adhered to:
• remove refrigerant;
• purge the circuit with inert gas;
• evacuate;
• purge again with inert gas;
• open the circuit by cutting or brazing.
Air-conditioners / User's Manual
The refrigerant charge shall be recovered into
the correct recovery cylinders. For appliances
containing flammable refrigerants, the system
shall be "flushed" with OFN to render the unit
safe. This process may need to be repeated
several times. Compressed air or oxygen shall not
be used for purging refrigerant systems.
For appliances containing flammable
refrigerants, flushing shall be achieved by
breaking the vacuum in the system with OFN
and continuing to fill until the working pressure
is achieved, then venting to atmosphere, and
finally pulling down to a vacuum. This process
shall be repeated until no refrigerant is within
the system. When the final OFN charge is used,
the system shall be vented down to atmospheric
pressure to enable work to take place. This
operation is absolutely vital if brazing operations
on the pipe-work are to take place.
Ensure that the outlet for the vacuum pump
is not close to any ignition sources and that
ventilation is available.

2.9 Charging procedures

In addition to conventional charging procedures,
the following requirements shall be followed.
- Ensure that contamination of different
refrigerants does not occur when using
charging equipment. Hoses or lines shall be as
short as possible to minimise the amount of
refrigerant contained in them.
- Cylinders shall be kept upright.
- Ensure that the refrigeration system is
earthed prior to charging the system with
refrigerant.
- Label the system when charging is complete
(if not already).
- Extreme care shall be taken not to overfill the
refrigeration system.
19 / EN