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 3 bar, 0.3 MPa)
G
Solar thermal system charged without heat effecting the system
H
At maximum pressure and the highest heat transfer medium tem-
perature
A solar expansion vessel is a sealed unvented vessel where the gas
space (nitrogen charge) is separated from the space containing liquid
(heat transfer medium) by a diaphragm; 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
R¾
7.5
7248 242
25
280
490
R¾
9.1
7248 243
40
354
520
R¾
9.9
B
7248 244
50
409
505
R1
12.3
7248 245
80
480
566
R1
18.4
12.14 Stagnation cooler
550
a
500
To protect the system components from excess temperatures in the
event of stagnation.
With a plate without any flow as contact protection.
■ Type 21:
– a = 105 mm
– Output at 75/65 °C: 482 W
– Cooling capacity at 140/80 °C: 964 W
Part no. Z007 429
■ Type 33:
– a = 160 mm
– Output at 75/65 °C: 834 W
– Cooling capacity at 140/80 °C: 1668 W
Part no. Z007 430
For detailed information, see chapter "Safety equipment".
Installation accessories
(cont.)
106
VIESMANN
VITOSOL
12
5822 440 GB