8 Start-up
22
Installation and maintenance instructions auroFLOW plus 0020149486_04
Note
All the settings that have been made can be
viewed and changed subsequently under the
menu point
Configuration
.
8.3
Carrying out pressure compensation
Caution.
Risk of damage as a result of incorrect or
incomplete pressure compensation.
Failure to purge the system or purging at a
time other than the one specified, may cause
damage to the solar system. Vaillant accepts
no liability for the correct operation of the
solar system in this instance.
▶
Make sure that the pressure compensa-
tion is carried out as described here, in
particular at the time specified.
The air that is in the collectors is heated up during installa-
tion of the complete solar plant. The density of the air in the
collectors is reduced.
When the solar system is started for the first time, the hot air
leaves the collectors and flows into the much cooler storage
tank of the solar charger, where it cools down. This leads to
negative pressure in the system.
As negative pressure in the solar system can lead to pump
noises and has a negative impact on the power and working
life of the solar pumps, pressure compensation must be car-
ried out at initial start-up.
Note
Once pressure compensation has been per-
formed, it is not necessary to repeat the process,
as long as the solar system is not opened.
Danger!
Risk of personal injury due to incorrect
pressure compensation.
Solar fluid or hot vapour escaping from the
purging valve may cause serious scalding.
▶
The following instruction must be followed
when carrying out the pressure compens-
ation.
1
2
▶
Carry out the pressure compensation immediately after
completing the installation assistant and, if required, re-
peat the procedure once again on that same evening if
the solar plant has cooled down.
▶
Connect a hose that runs down to the floor from the pur-
ging valve
(1)
.
▶
Place the end of the hose in a collecting container suit-
able for storing solar fluid
(2)
. Hold the hose in the col-
lecting container in such a way that air can flow into it.
▶
To ensure that you are sufficiently protected against es-
caping hot vapour and solar fluid, do not immerse the
end of the hose in the solar fluid.
▶
Start the
Test solar circuit filling
check programme.
–
Menu
→
Installer level
→
Test menu
→
Check pro-
grammes
→
Test solar circuit filling
At initial start-up of the system, air may collect in/in front of
the solar pumps. To force out the air, it may be necessary
to stop and restart the solar pumps several times. When the
solar pumps are running, noise and vibrations may occur,
however these are harmless.
▶
During the filling mode (solar pump running), wait for 2
minutes.
▶
With the solar pump still running, carefully open the pur-
ging valve.
◁
Some solar fluid may be emitted under pressure from
the hose.
◁
After this, air can be heard being drawn into the solar
system.
▶
Once air has stopped being drawn in after a few
seconds, close the purging valve.
▶
Stop the check programme
Test solar circuit filling
.
▶
Remove the hose from the purging valve.
