- 10 - 12/2020
Copyright © 2020, F
When it is absolutely necessary to have live power supply going in
servicing the appliance, it is necessary to install a
point to detect leakage so that adangerous situation is averted.
Special attention must be paid to ensuring that as aresult of the work performed on
electrical components the cover is not changed to the extent of affecting the level of
protection. T
and terminals not performed according to original specifications, damaged gaskets,
incorrect configuration of plugs, etc.
It is necessary to ensure that the appliance is mounted safely
It is necessary to ensure that gaskets or sealing materials are not damaged in such
away tha
parts must conform to the manufacturer‘sspecifications.
NOTE
type of leak detection devices. Intrinsically safe components do not need to be
disconnected prior to being worked on.
3. Repairs of intrinsically safe components
No permanently inductive or capacitative load may be placed on the circuit without it
being ensured that thereby the permitted voltage and curr
is not exceeded.
Intrinsically safe components are the only type on which it is possible to work in
aflammable envir
correct specifications.
Parts are replaced using only parts specified by the manufacturer
result in ignition of refrigerant upon leakage into the environmen
4. Cabling
Check that cabling is not exposed to wear and tear
vibrations, sharp edges or any other negative en
also take into consideration the effects of ageing and permanent vibrations from
sources such as compressors or fans.
5. Detection of ammable refrigerants
Under no circumstances may potential sourc
detecting refrigerant leaks.
Ahalogen burner (or any other type of detector utilising an open flame) must not be
used.
6. Leak detection methods
The following leak detection methods are considered ac
containing flammable refrigerants.
For the detection of flammable refrigerants
however their sensitivity may not be appropriate or they ma
(Detection equipment must be calibrated in an area without any refrigerant pr
It is important to ensure that the detector is not a
it is suitable for the used refrigerant.
LFL refrigerant and must be calibrated for the used r
percentage is confirmed (maximum 25 %).
Leak detection liquids are suitable for use on most refrigerants
containing chlorine must be excluded since chlorine may react with the refrigerant
and corrode copper pipes.
In the event of asuspected leak, all open flames must be removed/extinguished.
In the event that the refrigerant leak is found and requir
the refrigerant must be drained from the system or separ
apart of the system distant from the leak. The system must then be cleaned out using
oxygen-free nitrogen (OFN) both bef
7. Collection and pump discharge
In the event that the cooling circuit is breached due to r
– conventional proc
best method due to flammability. It is necessary to adhere to the following pr
collect the refrigerant;
clean out the circuit using inert gas;
pump out;
again clean out using inert gas;
open the circuit by cutting or hard soldering.
The contents of the circuit must be collected into c
system must be
safe. It may be necessary to repeat the procedur
compressed air nor oxygen may be used.
Flooding may be achieved by disrupting the vacuum in the sy
OFN, and by continued filling until the operating pressur
into the atmosphere and finally lowering to a
refrigerant still remains in the system.
must be ventilated to atmospheric pressur
activity is absolutely necessary if hard soldering is to be per
It is necessary to ensure that the vacuum pump outlets are not nearby to any ignition
source, and ventilation must be pr
8. Filling procedur
Apart from conventional filling procedur
adhered to.
– I
the filling device is used. Hoses or pipes must be as short as possible to minimise the
amount of refrigerant contained inside of them.
– Cylinders must be held vertically.
– It is important to ensure that the cooling system is gr
with refrigerant.
–
one already).
–
A
of a leak
into operation. A
location.
9.
Prior to performing this procedure it is essential that the technician fully acquain
him/herself with the device and all its particulars. Correct practice of safely collecting
all refrigerant is recommended. P
samples must be taken if an analysis is required prior to using the using the
regenerated refrigerant f
that electricity is available.
a)
b)
c)
if required, mechanical device for
all personal protective devices are available and used corr
the collection process is constantly under the supervision of acompetent person;
the collection device and cylinders comply with respective norms.
d)
e)
collection of refrigerant from various parts of the system.
f
started.
g)
manufacturer‘sinstructions.
h)
i)
j)
the cylinders and devices are immediately removed from the installa
and that all the separation valves on the device are closed
k)
cleaned and checked.
10. Marking with alabel
The appliance must be marked with a label indicating that it has been put out of
operation and is without refrigerant.
that there are labels on the appliance indicating that it con
11. Collection
When the refrigerant is collected from the system, either due t
put out of operation, it is recommended to adhere t
all the refrigerant.
When the refrigerant is transferred in
appropriate cylinders for collecting refrigerant are used.
It is necessary to ensure that there is a sufficient number of cylinders available to
contain the complete contents of the sy
be intended for collecting refrigerant and be marked with a
(i.e. special cylinders for collecting refrigerant).
a
collection cylinders are pumped empty and if possible cooled prior to collecting
refrigerant.
The collection device must be in good operating condition with a set of manuals
relating to the device, which ar
flammable refrigerants. Apart from this, a
condition must also be available. Hoses must be complete with c
seepage and in good condition. Prior to using the collection device, check that it is in
satisfactory operating condition, has been properly maintained and all the associated
electrical components are sealed to prevent ignition in the ev
released. If in any doubt, consult the manufacturer
The collected refrigerant must be returned to the refrigeran
collection cylinder and with arespectively arranged waste transport letter
are not to be mixed in the collection units and especially not in the cylinders.
In the event that compressors or compressor oils ar
are pumped out to an acceptable level in or
does not remain in the lubricant.
before the compressor is r
electrically heated compressor elements may be used.
the system, it must be disposed of safely
