Supra BLIZ'R 2600, Manual

render the unit safe. This process may need to 

be repeated several times. Compressed air or 

oxygen shall not be used for this task. 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 pipework are 

to take place.

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Ensure that the outlet for the vacuum pump is 

not close to any ignition sources and there is 

ventilation available.

CHARGING PROCEDURES

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In addition to conventional charging proce

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dures, the following requirements shall be 

followed.

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Ensure that contamination of different refrig

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erants 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.

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Cylinders shall be kept upright.

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Ensure that the refrigeration system is earthed 

prior to charging the system with refrigerant.

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Label the system when charging is complete (if 

not already).

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Extreme care shall be taken not to overfill the 

refrigeration system.

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Prior to recharging the system, it shall be 

pressure tested with OFN. 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.

DECOMMISSIONING

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Before carrying out this procedure, it is essen

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tial that the technician is completely familiar 

with the equipment and all its detail. It is rec

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ommended 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 

reuse 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 mani

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fold 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 overfill 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 filled 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.

LABELLING

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Equipment shall be labelled stating that it has 

been decommissioned and emptied of refriger

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ant. The label shall be dated and signed.

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Ensure that there are labels on the equipment 

stating the equipment contains flammable 

refrigerant.

RECOVERY

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When removing refrigerant from a system, 

either for servicing or decommissioning, it is 

recommended good practice that all refrigerants 

are removed safely. When transferring refriger

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ant 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. 

All cylinders to be used are designated for the 

recovered refrigerant and labelled for that refrig

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erant (i.e. special cylinders for the recovery of 

refrigerant). Cylinders shall be complete with 

pressure relief valve and associated shutoff 

valves in good working order. Empty recovery 

cylinders are evacuated and, if possible, cooled 

before recovery occurs.

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The recovery equipment shall be in good work

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