Further Details Regarding The Individual Steps; Cleaning, Testing For Leaks And Filling The Solar Thermal System - Viessmann Vitosol 200-T Service Instructions For Contractors

Commissioning, inspection, maintenance

Further details regarding the individual steps

Cleaning, testing for leaks and filling the solar thermal system

■ Never drain the system with a vacuum
pump.
■ Check the system for leaks:
The collector in its cold state must be
subject to a positive pressure of at
least 1.0 bar. At a static head of 10 m,
this would result in a system pressure
of 2.0 bar.
1. Cover collectors where necessary.
Open any installed shut-off gates or
valves by hand. Open the non-return
valves when using a Solar-Divicon:
Flow/return: Turn the thermometer
clockwise through 45 °.
2. Close the shut-off valve of the fill
valve and open the drain valve.
3. Flush the system via the return con-
nections. Fill and flush the system
with heat transfer medium via the fill
valve.
Flush using a high-speed pump over
an open container and continue until
no air remains in the collector system.
Correct commissioning can only be
guaranteed with a system that is
completely free of air. Now close the
drain valves on the fill valve, open the
shut-off valve and check the system
for leaks. Observe the permissible
operating pressure.
Pressure must not drop for at least
half an hour.
6
Notes
■ A heat transfer medium containing gly-
col can be damaged if it is exposed to
temperatures above 170 °C for a pro-
longed period (stagnation).
Temperatures in excess of 200 °C
result in a slow thermal breakdown of
the 1.2-propylene glycol that can be
recognised by the darkening of the
heat transfer medium.
Furthermore, it can result in the solar
circuit suffering from sludge and hard
deposits, particularly in conjunction
with other contaminants (cinder,
swarf) and air.
■ Ensure that the system is properly
cleaned, filled and ventilated after
installation.
■ After filling the system with the heat
transfer medium, ensure that the sys-
tem is properly vented and that heat is
transferred inside the system, i.e. that
longer periods of stagnation are pre-
vented.
■ Blow-off and drain lines must termi-
nate in an open container, that is capa-
ble of collecting the total capacity of
the collector.