14
Instructions on commissioning, maintenance, and troubleshooting for auroSTOR 0020111119_02
4.2 Solar
fluid
4.2.1
Properties of solar fluid
This information applies to Vaillant solar fluid
(20 l canister: article number 302498 and 10 l canister:
article number 302363).
Vaillant solar fluid is a ready-mixed frost and
corrosion protection agent, consisting of approximately
45% propylene glycol with anti-corrosion inhibitors and
55% water.
Vaillant solar fluid is extremely temperature-resistant
and can be used in conjunction with Vaillant tube collec-
tors and Vaillant flat collectors.
The solar fluid also has a high heat capacity.
The inhibitors provide reliable corrosion protection when
different types of metal are used (mixed installations).
b
Caution!
Risk of damaging the collectors and
other system parts if unsuitable solar
fluid is used.
If you mix the solar fluid with water or
another liquid, frost and corrosion protec-
tion cannot be ensured.
>
Never mix the solar fluid with water
or another liquid.
i
Do not use any other frost protection agents or
inhibitors for the Vaillant solar heating system.
Only Vaillant's solar fluid is permitted for use
with the system.
Vaillant solar fluid is infinitely durable in hermetically
sealed containers.
It is not dangerous if it comes into contact with the skin.
Eye contact only causes minor irritations, you should
nevertheless immediately wash your eyes.
Pay attention to the safety data sheet
(
¬
section 4.2.4
).
4.2.2 Solar circuit frost and corrosion protection
system
In order to reliably protect the solar heating system
from frost in winter, you must fill the entire system with
undiluted Vaillant solar fluid.
i
Filling the solar heating system with Vaillant
solar fluid provides frost protection up to
approx. -28 ºC.
Even at outside temperatures of lower than
-28 ºC, frost damage does not occur straight
away since the explosive effect of the water is
distributed. Check the frost protection effect
after filling the system and then once every year.
We recommend the Vaillant refractometer for quick and
simple checking. A classic Vaillant frost protection tester
can be used for this.
See the enclosed operating instructions.
4.2.3 Cylinder frost protection
If you want to put a cylinder out of operation where it
may be at risk from frost, you must drain it completely.
It is drained at the cold water inlet with a T-piece with
tap to be provided by the installer.
Any heat exchangers not filled with solar fluid in rooms
which are at risk of frost must also be completely
drained.
4 Description of the components
