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INFORMATION
Protection against bursting: the glycol will prevent the
piping from bursting, but NOT the liquid inside the piping
from freezing.
Protection against freezing: the glycol will prevent the
liquid inside the piping from freezing.
NOTE
The required concentration might differ depending on
the type of glycol. ALWAYS compare the requirements
from the table above with the specifications provided
by the glycol manufacturer. If necessary, meet the
requirements set by the glycol manufacturer.
If the liquid in the system is frozen, the pump will NOT
be able to start. Mind that if you only prevent the system
from bursting, the liquid inside might still freeze.
When water is at standstill inside the system, the
system is very likely to freeze and get damaged.
9.5 Adding water
Connect the water supply to the fill valve and open the valve.
Make sure the automatic air purge valve is open (at least 2 turns).
Fill with water until the manometer indicates a pressure of approximately 2.0 bar. Remove air in the circuit as much as
possible using the air purge valves. Air in the water circuit could lead to malfunction of the backup electric heater.
112
EN
2. Freeze protection by freeze protection
valves
About freeze protection valves
When no glycol is added to the water, you can use freeze
protection valves to drain the water from the system before it
can freeze.
Also refer to "10.3 Pre-operation checks/Checks before
initial start-up".
Do not fasten the black plastic
cover on the vent valve at the
topside of the unit when the
system is running. Open air
purge valve, turn anticlockwise
at least 2 full turns to release
air from the system.
Cod. 3QE47660 - Rev. 00 - 02/2022
OMNIA M 3.2
Install freeze protection valves (field supply) at all lowest
points of the field piping.
Normally closed valves (located indoors near the piping
entry/exit points) can prevent that all water from indoor
piping is drained when the freeze protection valves open.
NOTE
Water may enter into the flow switch and cannot be
drained out and may freeze when the temperature is
low enough. The flow switch should be removed and
dried, then can be reinstalled in the unit.
Counterclock Wise rotation, remove the flow switch.
Drying the flow switch completely.
Keep dry
22T÷30T
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