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9. Charging procedures

• In addition to conventional charging

procedures, the following requirements shall
be followed.

- Ensure that contamination of diﬀ erent

refrigerants does not occur when using
charging equipment.

- Hoses or lines shall be as short as possible

to minimize 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 over ﬁ ll

the refrigeration system.

• Prior to recharging the system it shall be

pressure tested with OFN (refer to #7).

• The system shall be leak tested on completion

of charging but prior to commissioning.

• A follow up leak test shall be carried out prior

to leaving the site.

• Electrostatic charge may accumulate and

create a hazardous condition when charging
and discharging the refrigerant.To avoid ﬁ re
or explosion, dissipate static electricity during
transfer by grounding and bonding containers
and equipment before charging/discharging.

10. Decommissioning

• Before carrying out this procedure, it is

essential that the technician is completely
familiar with the equipment and all its details.

• It is recommended good practice that all

refrigerants are recovered safely.

• Prior to the task being carried out, an oil

and refrigerant sample shall be taken in
case analysis is required prior to re-use of
reclaimed refrigerant.

• It is essential that electrical power is available

before the task is commenced.

a) Become familiar with the equipment and

its operation.

b) Isolate system electrically.
c) Before attempting the procedure ensure

that:

• mechanical handling equipment is

available, if required, for handling
refrigerant cylinders;

• all personal protective equipment is

available and being used correctly;

• the recovery process is supervised at all

times by a competent person;

• recovery equipment and cylinders conform

to the appropriate standards.

d) Pump down refrigerant system, if possible.

e) If a vacuum is not possible, make a manifold

so that refrigerant can be removed from
various parts of the system.

f) Make sure that cylinder is situated on the

scales before recovery takes place.

g) Start the recovery machine and operate

in accordance with manufacturer’s
instructions.

h) Do not over ﬁ ll cylinders. (No more than

80 % volume liquid charge).

i) Do not exceed the maximum working

pressure of the cylinder, even temporarily.

j) When the cylinders have been ﬁ lled

correctly and the process completed, make
sure that the cylinders and the equipment
are removed from site promptly and all
isolation valves on the equipment are
closed oﬀ .

k) Recovered refrigerant shall not be charged

into another refrigeration system unless it
has been cleaned and checked.

• Electrostatic charge may accumulate and

create a hazardous condition when charging
or discharging the refrigerant.To avoid ﬁ re or
explosion, dissipate static electricity during
transfer by grounding and bonding containers
and equipment before charging/discharging.

11. Labelling

• Equipment shall be labelled stating that it

has been de-commissioned and emptied of
refrigerant.

• The label shall be dated and signed.
• Ensure that there are labels on the equipment

stating the equipment contains ﬂ ammable
refrigerant.

12. Recovery

• When removing refrigerant from a system,

either for servicing or decommissioning,
it is recommended good practice that all
refrigerants are removed safely.

• When transferring refrigerant into cylinders,

ensure that only appropriate refrigerant
recovery cylinders are employed.

• Ensure that the correct number of cylinders

for holding the total system charge are
available.