Solar expansion vessel
Design and function
With shut-off valve and fixings
A
Heat transfer medium
B
Nitrogen charge
C
Nitrogen buffer
D
Minimum safety seal 3 l
E
Safety seal
F
Delivered condition (pre-charge pressure 4.5 bar, 0.45 MPa)
G
Solar thermal system filled, without heat effect
H
At maximum pressure and the highest heat transfer medium
temperature
A solar expansion vessel is a sealed vessel where the gas space
(nitrogen charge) is separated from the space containing liquid (heat
transfer medium) by a diaphragm and the pre-charge pressure is
subject to the system height.
Specification
b
b
a
a
Expansion vessel
Part no.
Capacity
Ø a
b
Connection
Weight
l
mm
mm
kg
A
7248 241
18
280
370
R ¾
7.5
7248 242
25
280
490
R ¾
9.1
7248 243
40
354
520
R ¾
9.9
B
7248 244
50
409
505
R 1
12.3
7248 245
80
480
566
R 1
18.4
Note
Included in standard delivery with solar packs
Line regulating valve
Part no. ZK01 510
For hydraulically balancing solar collector arrays
■ With locking ring fitting Ø 22 mm
■ Max. operating temperature: 200 °C
■ For max. 5 collectors per row
Line regulating valve
Part no. ZK01 511
For hydraulically balancing solar collector arrays
■ With locking ring fitting Ø 22 mm
■ Max. operating temperature: 200 °C
■ For 5 to 12 collectors per row
Installation accessories
(cont.)
VITOSOL
VIESMANN
91
5822 440 GB
8