Manual Inventum AC907W (page 36 of 100) (English, German, Dutch, French)

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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

there is ventilation available.

13. Charging procedures (Annex DD.10)

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.

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.

14. Decommissioning (Annex DD.11)

Before carrying out this procedure, it is essential that the technician is completely

familiar with the equipment and all its detail. 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 overﬁll cylinders. (No more than 80 % volume liquid charge).

i) Do not exceed the maximum working pressure of the cylinder, even temporarily.

36 • English

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Inventum AC907W Manual

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