Download TECHNICAL MANUAL MANUAL TÉCNICO

10 ACCUMULATION
The versions with accumulation offer
different set-ups that vary on the basis of
the effective pressure that you want to
obtain, the characteristics of the pumping
unit, and the presence or absence of holes
for integrative resistance.
The following tables show the main
characteristics of the components of the
hydraulic circuit, while the graphs on these
pages show the relative pressures.
The accumulation tanks with holes
for heaters are equipped with plastic,
temporary closing plugs.
Glycole mix
Hm
bar
l (1)
l (2)
l (3)
30
3.2
2.174
978
510
Water temperature °C
25
2.8
2.646
1190
622
20
2.3
3.118
1404
732
15
1.8
3590
1616
844
Reference
condition
max.
min.
10%
40
-2
0,507
(1)
10%
60
-2
0,686
(2)
(3)
10%
85
-2
0,809
20%
40
-6
0,434
(1)
20%
60
-6
0,604
(2)
20%
85
-6
0,729
(3)
35%
40
-6
0,393
(1)
35%
60
-6
0,555
(2)
10.1
35%
85
-6
0,677
(3)
The standard value of pre-charge pressure
of the two expansion tanks is 1.5 bar, while
their volume is 24 litres, maximum value
6 bar.
The calibration of the tanks must be
regulated on the basis of the maximum
difference of level (H) of the user (see
figure), according to the formula:
p (calibration) [bar] = H [m] / 10.2 + 0.3.
For example, if the level difference H is
20m, the calibration value of the tank will
be 2.3 bar.
If the calibration value obtained from the
calculation is lower than 1.5 bar (i.e. for H <
12.25), maintain the standard calibration.
GlYjÛºÛ?Û£Û~‡۶ۇ€
?ÛeYpÛ¨~©ÛºÛ‚‚Ûe
?ÛºÛ~‚Ûe
GlYjÛºÛ~‚ÛZYj
10.1.1 Calibration of expansion tank
Reference working conditions:
(1) Cooling: Max. water temp. 40 °C. Min water temp 4 °C.
(2) Heating (heat pump): Max. water temp 60 °C. Min water temp 4 °C.
(3) Heating (boiler): Max. water temp 85 °C. Min water temp 4 °C.
?
?ۺۇÛe
GlYjÛºÛ~‚ÛZYj
MAXIMUM WATER CONTENT
in the system
≥ 12.25
1.5
3852
1732
904
Correction
factor
WARNING
Before start-up, the installer must
assemble the heaters. If these heaters
are not immediately necessary, the
plastic plugs must be replaced with
suitable metal plugs.
The table below indicates the maximum
water content, in litres, of the hydraulic
system, compatible with the capacity of the
expansion tank supplied as standard. The
values shown in the table refer to three
conditions of maximum and minimum
water temperature. If the effective water
content of the hydraulic system (including
the accumulation tank) is greater than that
shown in the operational conditions table,
another, additional expansion tank must
be installed, measured (using the common
criteria) with reference to the additional
volume of water.
From the following tables, it is possible
to obtain the values of maximum system
content, also for other operational
conditions with glycol water.
The values are obtained by multiplying
the reference value by the correction
coefficient.
24
Hydraulic height
Expansion tank calibration
Reference value water content
Reference value water content
Reference value water content
?ÛeafÛ¨©
(1) Ensure that the highest terminal unit doesn’t
exceed 55 metres of level difference.
(2) Ensure that the lowest terminal unit can support the global pressure present at that point.