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Idiomas disponibles
I.4.4 Use of antifreeze solutions
The use of ethylene glycol is recommended if you do not wish to drain the water from the hydraulic system during the winter stoppage, or if the unit
has to supply chilled water at temperatures lower than 5°C. The addition of glycol changes the physical properties of the water and consequently the
performance of the unit. The proper percentage of glycol to be added to the system can be obtained from the most demanding functioning conditions
from those shown below
Table shows the multipliers which allow the changes in performance of the units to be determined in proportion to the required percentage of ethyle-
ne glycol.
The multipliers refer to the following conditions: condenser inlet air temperature 35°C; cooled water temperature 7°C; temperature differential at the
evaporator 5°C.
For different functioning conditions, the same coefficients can be used as their variations are negligible.
The resistance of the water side primary and secondary heat exchanger (standard), the buffer tank (RAS accessory) and the electric pump unit (RAE-RAR
accessory), prevents undesired effects due to freezing during the operating breaks in winter (provided the unit remains powered).
ATTENTION
Besides the 20% glycol, the absorption of the pump can increase with respect to the declared value (in versions P1/PR1-P2/PR2, DP1/DPR1-DP2/DPR2,
ASP1-ASP2, ASDP1-ASDP2).
Design air temperature in °C
% glycol in weight
Freezing temperature °C
fc G
fc
Δ
fc QF
fc P
fc G
Correction factor of the glycol water flow to the evaporator
fc
Δ
Correction factor of the pressure drops in the evaporator
fc QF
Cooling capacity correction factor
fc P
Correction factor for the total absorbed electrical current
I.5 Warnings regarding potentially toxic substances
ATTENTION!
Read the following information about the refrigerants employed
carefully. Adhere scrupulously to the warnings and first aid procedures
indicated below.
Identification of the type of refrigerant fluid used
o Difluoromethane (HFC 32) 50% by weight
ɱ Pentafluoroethane (HFC 125) 50% by weight N° CAS: 000354-33-6
Identification of the type of oil used
The lubricant used in the unit is polyester oil; please refer to the indications
on the compressor data plate.
DANGER!
For further information regarding the characteristics of the refrigerant
and oil used, refer to the safety data sheets available from the refrige-
rant and oil manufacturers
Main ecological information regarding the types of refrigerant fluids used
• Persistence, degradation and environmental impact
Refrigerant
Chemical formula
R32
CH2F2
R125
C2HF5
2
0
10
15
-5
-7
1.025
1.039
1.085
1.128
0.975
0.967
0.993
0.991
N° CAS: 000075-10-5
GWP (over 100 years)
550
3400
EQPI3X
-3
-6
20
25
-10
-13
1.054
1.072
1.191
1.255
0.963
0.956
0.990
0.988
HFC R32 and R125 refrigerants are the single components which mixed at
50% make up R410A. They belong to the hydrofluorocarbons group and
are regulated by the Kyoto protocol (1997 and subsequent revisions) being
gases that contribute to the greenhouse effect. The index which mea-
sures how much a certain mass of greenhouse gas contributes to global
warming is the GWP (Global Warming Potential). The standard measure for
carbon dioxide (CO2) is GWP=1.
The value of GWP assigned to each refrigerant represents the equivalent
amount in kg of CO2 released over a period of 100 years, in order to have
the same greenhouse effect of 1kg refrigerant released over the same
period of time.
The R410A mixture does not contain elements that are harmful to the ozo-
ne layer, such as chlorine; therefore, its ODP (Ozone Depletion Potential) is
zero (ODP=0).
GWP (over 100 years)
ENVIRONMENTAL PROTECTION!
The hydrofluorocarbons contained in the unit cannot be released into
the atmosphere as they are gases that contribute to the greenhouse
effect.
R32 and R125 are hydrocarbons which decompose rapidly into the
lower atmosphere (troposphere). Decomposition by-products are highly
dispersible and thus have a very low concentration. They do not affect
photochemical smog (that is, they are not classified among VOC volatile
organic compounds, according to the guidelines established by the UNE-
CE agreement).
-10
-15
30
35
-16
-20
1.093
1.116
1.319
1.383
0.948
0.944
0.986
0.983
Refrigerant
R410A
Components
R32/R125
Composition
50/50
ODP
0
2000
EN
-20
40
-25
1.140
1.468
0.937
0.981
37
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