Manual Sogo SS-1287 (page 28 of 88) (English, German, French, Italian, Portuguese, Spanish)

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CHARGING PROCEDURES

DECOMMISSIONING

In addition to conventional charging procedures,

the following requirements shall be followed.

– Ensure that contamination of differen

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.

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.

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

RECOVERY

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 flammable

refrigerant.

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 is available. All cylinders to be used are

designated for the recovered refrigerant and

labelled for that refrigerant (i.e. special cylinders

for the recovery of refrigerant). Cylinders shall

be complete with pressure relief valve and

associated shut-off valves in good working order.

Empty recovery cylinders are evacuated and, if

possible, cooled before recovery occurs.

The recovery equipment shall be in good working

order with a set of instructions concerning the

equipment that is at hand and shall be suitable

for the recovery of flammable refrigerants. In

addition, a set of calibrated weighing scales shall

be available and in good working order. Hoses

shall be complete with leak-free disconnect

couplings and in good condition. Before using the

recovery machine, check that it is in satisfactory

working order, has been properly maintained

and that any associated electrical components

are sealed to prevent ignition in the event of a

refrigerant release. Consult manufacturer if in

doubt.

The recovered refrigerant shall be returned to

the refrigerant supplier in the correct recovery

cylinder, and the relevant Waste Transfer Note

arranged. Do not mix refrigerants in recovery

units and especially not in cylinders.

If compressors or compressor oils are to be

removed, ensure that they have been evacuated

to an acceptable level to make certain that

flammable refrigerant does not remain within

the lubricant. The evacuation process shall be

carried out prior to returning the compressor

to the suppliers. Only electric heating to

the compressor body shall be employed to

accelerate this process. When oil is drained from

a system, it shall be carried out safely.

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Sogo SS-1287 Manual

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