12. ACCUMULATOR
H max (1) = 55 m
H = 12.25 m
H
H = 0 m
Pt
ar = H / 1
0.2 + 0.3
Pt
ar = 1
.5 bar
Pt
ar = 1
.5 bar
H min (2)
Hydraulic height
H m 30
25
20
15
≥
12.25
Expansion tank calibration
bar 3.2
2.8
2.3
1.8
1.5
Water content reference value
l
(1)
2.174
2.646
3.118
3590
3852
Water content reference value
l
(2)
978
1190
1404
1616
1732
Water content reference value
l
(3)
510
622
732
844
904
Glycol water
Water temp. °C
Correction
coefficient
Reference
condition
max.
min.
10%
40
-2
0.507
(1)
10%
60
-2
0.686
(2)
10%
85
-2
0.809
(3)
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)
35%
85
-6
0.677
(3)
Working reference 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.
12.1. MAXIMUM/MINIMUM WATER
CONTENT IN THE SYSTEM
In the table 12.2 the maximum content
is indicated in litres of water of the
hydraulic system, compatible with
expansion tank capacity supplied
as part of the standard equipment
(IN VERSIONS WITH ACCUMULATION
OR VERSIONS WITH PUMP ONLY). The
values shown in the table refer to three
conditions of maximum and minimum
water temperature. If the actual
water content of the hydraulic system
(including the accumulation tank)
exceeds the level indicated in the table
referred to the operating conditions, an
additional scaled expansion tank must
be installed, using the usual criteria, with
respect to the additional water volume.
From tables 12.3, 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.
The standard pressure value for pre-
charging the expansion tank is 1.5 bar,
and the volume is 25 litres. Maximum
value 6 bar.
The tank must be calibrated according
to the maximum difference in height (H)
of the device (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.
12.1.1. Maximum water content
recommended
12.1.2. Expansion tank calibration
MINIMUM WATER CONTENT
(1) Minimum water content
(2)
Minimum water content in the case of process applications or operation with low outside temperatures and low load.
Adjusting the outlet water temperature.
project
∆
t less than 5°C.
KEY
(1)
Check that the highest user does not exceed
a level difference of 55 metres.
(2) Check that the lowest user can sustain the global
pressure acting at that point.
NRL
No
Compressor
(1) l/KW
(2) l/KW
2800
10
4
8
3000
12
4
8
3300
3600
12.2
12.3
24
INRLPY. 02.10 4086916_01
Summary of Contents for NRL
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