Fujitsu ARXG-KLLAP Series Installation Manual Download Page 3

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En-3

CAUTION

5-Cabling

• Check that cabling will not be subject to wear, corrosion, excessive pressure, vibra-

tion, sharp edges or any other adverse environmental effects.

• The check shall also take into account the effects of aging or continual vibration from

sources such as compressors or fans.

6-Detection of

ammable refrigerants

• Under no circumstances shall potential sources of ignition be used in the searching

for or detection of refrigerant leaks.

• A halide torch (or any other detector using a naked

ame) shall not be used.

7-Leak detection methods

• Electronic leak detectors shall be used to detect

ammable refrigerants, but the

sensitivity may not be adequate, or may need re-calibration. (Detection equipment
shall be calibrated in a refrigerant-free area.)

• Ensure that the detector is not a potential source of ignition and is suitable for the

refrigerant used.

• Leak detection equipment shall be set at a percentage of the LFL of the refrigerant

and shall be calibrated to the refrigerant employed and the appropriate percentage of
gas (25 % maximum) is con

rmed.

• Leak detection

uids are suitable for use with most refrigerants but the use of

detergents containing chlorine shall be avoided as the chlorine may react with the
refrigerant and corrode the copper pipe-work.

• If a leak is suspected, all naked

ames shall be removed/extinguished.

• If a leakage of refrigerant is found which requires brazing, all of the refrigerant shall

be recovered from the system, or isolated (by means of shut off valves) in a part of
the system remote from the leak.
Oxygen free nitrogen (OFN) shall then be purged through the system both before
and during the brazing process.

8-Removal and evacuation

• When breaking into the refrigerant circuit to make repairs – or for any other

purpose –conventional procedures shall be used.
However, it is important that best practice is followed since

ammability is a consid-

eration.
The following procedure shall be adhered to:

• remove refrigerant
•  purge the circuit with inert gas
• evacuate
•  purge again with inert gas
•  open the circuit by cutting or brazing

• The refrigerant charge shall be recovered into the correct recovery cylinders.
• The system shall be “

ushed” with OFN to 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

ll until 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 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.

9-Charging procedures

• 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 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

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 commission-

ing.

• A follow up leak test shall be carried out prior to leaving the site.

CAUTION

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 refriger-

ant 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

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 un-

less it has been cleaned and checked.

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

am-

mable 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.

• 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

ammable 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

ammable 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.

Explanation of symbols displayed on the indoor unit or outdoor unit.

WARNING

This symbol shows that this appliance uses a

ammable