Manual Taurus AC 351 RVKT (page 26 of 188) (English, German, Dutch, French, Italian, Polish, Portuguese, Spanish)

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the working pressure is achieved, then venting

to atmosphere, and nally pulling down to a

vacuum. This process shall be repeated until

no refrigerant is within the system. When the

nal 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.

- Ensure that the outlet for the vacuum pump is

not close to any ignition sources and there is

ventilation available.

CHARGING PROCEDURES

- In addition to conventional charging proce-

dures, the following requirements shall be

followed.

- Ensure that contamination of different refrig-

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.

- 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ll the

refrigeration system.

- 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

- Before carrying out this procedure, it is essen-

tial that the technician is completely familiar

with the equipment and all its detail. It is rec-

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-

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 over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 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.

LABELLING

- Equipment shall be labelled stating that it has

been decommissioned and emptied of refriger-

ant. The label shall be dated and signed.

- Ensure that there are labels on the equipment

stating the equipment contains ammable

refrigerant.

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 refriger-

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-

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.

- The recovery equipment shall be in good work-

ing order with a set of instructions concerning

the equipment that is at hand and shall be

suitable for the recovery of ammable refriger-

ants. In addition, a set of calibrated weighing

scales shall be available and in good working

order. Hoses shall be complete with leakfree

disconnect couplings and in good condition. Be-

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Taurus AC 351 RVKT Manual

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