Unical HP_OWER ONE 70R - Page 31

30
Measurement
Completed
Notes
- The cylinders must be kept vertical.
- Make sure that the refr
igeration system is grounded before proceeding
to recharge the system with the refrigerant fluid.
- Label the system when charging is complete, (if not already done).
- Particular care must be taken not to overload the refrigeration system.
Before recharging, the system must be subjected to the pressure test
with OFN. The system must undergo a leak test at the end of charging
but before putting it into operation. An additional leak test must be
performed before leaving the site.
15
Decommissioning
Before car
rying out this procedure, it is essential that the technician is
totally familiar with the apparatus and every detail of it. It is good
practice th
at all refrigerant fluids are safely stored. Before carrying out
the work,
samples of oil and refrigerant mus
t be taken in case an analysis
is required before using the refrigerant again. It is essential that
electricity is available before starting work.
a) Become familiar with the equipment and its operation.
b) Isolate the sys
tem from an electrical point of view.
c) Before trying the procedure, make sure that:
-
a mechanical maneuvering device is available, if required, to handle the
cylinders of the ref
rigerant fluids;
-
all personal protective equipment is available and used correctly;
-
that the recovery pro
cess is constantly under the control of a competent
person;
-
that the recovery apparatus and the cylinders comply with the relevant
standards.
d)
Depressurize the cooling system, if possible.
e) If the vacuum cannot be ob
tained, connect a manifold so that the
refrigerant fluid can be removed from various parts of the system.
f) Make sure that the cylinder is located on the scale before recovery
take
s place.
g) Start the recovery machine and operate it according to the
manu
facturer's instructions.
h) Do not
overfill the cylinders (no more than 80% by volume of the refill
liquid).
i) Do not exceed, even temporarily, the maximum operating pressure of
th
e cylinder.
j) When the cylinders have been correctly filled and the proces
s is
finished, check that the cyli
nders and the equipment are removed
promptly from the site and that all the isolation valves of the appliance
are closed.
k) Recovered refrigerant
fluids must not be loaded into another
refrigeration system unless they hav
e been cleaned and checked.
16
Identification (labeling of the heat pump)
If the heat pump is taken out of service, post a label with a signature and
date in a clearly visible
position, which contains the following
information
:
■
The refrigerant is flammable.
■
The plant has been taken out of service.
■
The coolant has been removed.
17
Recovery
When removing refrigerant fluids from a system, either for maintenance
or for d
ecommissioning, it is good practice that this is done safely.
When transferring the refrigerant fluid into the cylinders, check that only
cylinders suitable for the recovery of refrigerant fluids are used. Make
sure that the exact number of cylinders is av
ailable for
contain the total system charge. All the
cylinders to be used are
designated for the refrigerant fluid gu
arded and labeled for that
refrigerant fluid (i.e., special cylinders for the