18
English
Liebert HPM --- A/W/F/D/H
10.4 -- Refrigeration circuit
WHEN REPAIRING THE REFRIGERATION CIRCUIT
COLLECT ALL REFRIGERANT IN A CONTAINER: DO
NOT ALLOW IT TO ESCAPE.
S When either removing (for repairs) or charging refriger-
ant this must always be done on both the high and low
pressure sides of the compressor simultaneously.
S The compressor copper plated steel connectionsshould
be welded with a silfos material containing a minimum of
5% silver.
10.4.1 --- Refrigerant charge of the water---cooled units
(W, F and H)
1) Start the unit as described in para. 7.1.
2) Manually start the compressor (ensure the unit is not in
dehumidification).
3) W ait a few minutes to allow conditions to stabilize.
4) Check the refrigerant circuit using a leak detector. If there
is a leak recharge the unit until the working co nditions of
theentirerefrigerationcircuithavebecomenormal.
5) Using a manometer, check that the evaporating temper-
ature is above 0_C.
6) V erify the water pressostatic valve (WV) setting (CHAP.
8).
7) Verify that the superheat is 5---8 K (to do this refer to
Chap. 8).
10.4.2 --- Oil charge R410A
The oil to be used when topping up (only if there are any
leaks) is EMKARATE RL 32---3MA or Mobil EAL Arctic
22CC (see Tab. g and Tab. h).
T ab. g --- EMKARATE RL 32---3MA oil (for R410A only)
Viscosity at 40 _C : 31.2 cSt
Viscosi t y at 100 _C : 5.6 cSt
Viscosity index (ISO Grade) : 32
Tab. h --- Mobil Arctic EAL 22CC oil (for R410A only)
Density (at 15 _C) : 0.967 kg/l
Flash point (C.O.C.) : 245 ° C
Pour point : < --- 5 4 ° C
Viscosity at 40 _C : 23.6 cSt
Viscosi t y at 100 _C : 4.7 cSt
Viscosity index (ASTM D2270) : 130
These oils rapidly absorb the humidity present in the air
when they are exposed to the atmosphere.
If the oil absorbs humidi ty, the ester molecules can break
down, forming acidity.
We therefore recommend exposing the oil for as short a t ime
as possible (no more than a few minutes) and, in case of top-
ping up, using exclusively the oil indicated on the refrigerat-
ing compressor.
Normally 1 or 2---litre cans are available for this purpose;
once they are opened, they must be completely used up.
They must not be used af ter a long period, as they absorb
humidity.
It is therefore obvious that the taps of the compressor must
only be turned after the whole plant has been subjected to a
vacuum and partial filling.
10.4.3 --- Oil topping---up of an installed circuit
If oil leakages occur,the topping---upoperation isnecessary.
(Contact the local Service before intervention).
10.4.4 --- Compressor removal (only L units)
If the innermost compressor is faulty, a few steps must be
carried out to ensure an easy replacement (see Fig. 1 --- En-
closure G).
10.5 -- Dismantling the unit
The machine has been designed and built to ensure con-
tinuous operation.
The working life of some of the main components, such as
the fan and the compressor, depends on the maintenance
that they receive.
The unit contains substances and components
hazardous for the environment (electronic com-
ponents, refrigerating gases and oil s). At the end
of the useful life, when the unit is dismantled, the
operation must be carried out by specialized re-
frigerating technicians. The unit must be delivered to suit-
able centers specialized for the collection and di
sposal of
equipment containing hazardous substances.
10.6 -- Regulation (EC) no. 842/2006 (F--gas)
Stationary air conditioning placed into the
European Community market and operating with
fluorinated greenhouse gases (f ---gas), such as
R407C, R134a, R410A, they have to comply with the
F---gas Regulation (applied since 04 July 2007).
(Be aware that refrigerants as R22 are not f--- gas and
their relevant regulation is Reg. (EC) no. 2037/2000).
Following notes have to be considered when operating
with the abov e mentioned equipments.
S Fluorinated greenhouse gases are covered by the
Kyoto Protocol.
S The fluorinated greenhouse gases in this equipment
should not be vented to the atmosphere.
S Referring to the value noted in Annex I of Regulation (EC)
No 842/2006
here below the global warming potential (GWP) of
some major f ---gases
R ---134a GWP 1300
R ---407C GWP 1610
R ---410A GWP 1890
S Operators of the above mentioned applications,
which contain fluorinated greenhouse gases, shall, us-
ing all measures which are technically feasible and do
not entail disproportionate cost:
a. prevent leakage of these gases and as so on as pos-
sible repair any detected leakage.
b. ensure that they are checked for leakage by certified
personnel .
c. ensure for putting in place arrangements for the
proper recovery by certified personnel.
d. In case of applications containing 3 kg (6kg in case
of hermetically sealed system) or more of f ---gases:
certified personnel and Companies (according to
Reg. 303/2008) provides regular leak testing (ac-
cording to Reg. 1516/2007 and Reg. 1497/2007) and
maintain records of maintenance activities in a ded-
icated log book.
e. Recovery for the purpose of recycling, reclama-
tion or destruction of the fluorinated greenhouse
gases, pursuant to Art.4 (Recovery) of
Reg.842/2006, shall take place before the final
disposal of that equipment and, when appropri-
ate, during its servicing and maintenance.
S Operator, according to Reg. 842/2006, Article 2, point 6,
means the natural or legal person exercising actual
power over the technical functioning of the equipment
and system covered by the Regulation. The State may,
in defined, specific situations, designate the owner as
being responsible for the operator’s obligations.
S Direct methods of leakage checking approved by the
manufacturer (Reg. 1516/2007 and Reg. 1497/2007)
a. gas detection device adapted to the refrigerant in the
system; the sensitive of portable gas detection
devices (as a direct test method) shall be at least five
grams par year.
b. proprietary bubble solutions / soapsuds.
S Additional information located into a dedicated label
of unit (Reg. 1494/ 2007)
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