Weishaupt WHI sol/aqua 20 1, Руководство пользователя, Страница: 33 / 36

Installation and operation instructions
Separation station WHI sol/heat 20 #1 / 40 #1; Separation station WHI sol/aqua 20 #1 / 40 #1
10 Function of the check valves
83514202 ▪ 1/2014-06 ▪ Ext. PAW
33-36
9 Accessories
Sampling valve (item no. -w- 40900015017) on
WHI sol/aqua optionally available as accessory:
Inflammable valves for germ-free sampling of water
samples according to German Drinking Water Ordinance.
Mounted laterally on the piston valves.
10 Function of the check valves
The check valves in this station prevent undesirable gravity circulation within their range
of use. The functioning of the check valves depends:

on the system height

on the temperature difference between storage tank and collector

on the solar fluid used
On the diagram shown below, you can see whether the integrated check valves of the
station are sufficient for your system. If the check valves are not sufficient, further
structural measures must be taken to prevent gravity circulation. You can install, for
example, syphons ("heat traps"), 2-way valves (zone valves) or additional check valves.
Example:
• The station is equipped with two check valves
(2 x 200 mm wc = 400 mm wc).
•
You use a mixture of water and 40% strength propylene glyclol as the solar
fluid.
•
The system height between collector and storage tank is 10 m.
Sy
st
em
he
igh
t in
m
Temperature between collector/storage tank in K
Result:
The check valves prevent gravity circulation up to a temperature difference of approx.
62 K. At a higher temperature difference between collector and storage tank, the differ-
ence in density of the solar fluid is so large that the check valves are pressed open.
Solar fluid
Circulation