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•
Determine the calculated pre-pressure (Pg) for the
corresponding maximum water volume using the graph
below.
•
Check that the total water volume in the entire water
circuit is lower than this value. If this is not the case,
the expansion vessel inside the unit is too small for the
installation.
Max. water volume [L]
Pre-pressure = pre-pressure of the expansion vessel
Maximum water volume = maximum water volume in the
system
A1 System without glycol
A2 System without 25% propylene glycol
Example 1:
The unit is installed 5m below the highest point in the water
circuit. The total water volume in the water circuit is 100 L. In
this example, no action or adjustment is required.
Example 2:
The unit is installed at the highest point in the water circuit.
The total water volume in the water circuit is 250 L.
Result:
•
Since 250 L is more than 230 L, the pre-pressure must be
decreased (see table above).
•
The required pre-pressure is: Pg (bar) = (H(m)/10+0.3)
bar = (0/10+0.3) bar = 0.3 bar
•
The corresponding maximum water volume can be read
from the graph: approximately 310L.
•
Since the total water volume (250L) is below the
maximum water volume (310L), the expansion vessel
suffices for the installation.
Setting the pre-pressure of the expansion vessel
When it is required to change the default pre-pressure of the
expansion vessel (1.0 bar), following guidelines:
•
Use only dry nitrogen to set the expansion vessel pre-
pressure.
•
Inappropriate setting of the expansion vessel pre-
pressure will lead to malfunctioning of the system. Pre-
pressure should only be adjusted by a licensed installer.
Selecting the additional expansion vessel
If the expansion vessel of the unit is too small for the
installation, an additional expansion vessel is needed.
110
EN
OMNIA M 3.2
•
calculate the pre-pressure of the expansion vessel: Pg
(bar)= (H(m)/10+0.3) bar
the expansion vessel equipped in the unit should adjust
the pre- pressure also.
•
calculate the volume needed of the additional expansion
vessel:
V1 =0.0693*Vwater/(2.5-Pg)-V0
Vwater is volume of water in the system, V0 is volume of
expansion vessel which the unit is equipped (8L).
9.4.3 Water circuit connection
Water connections must be made correctly in accordance
with labels on the outdoor unit, with respect to the water inlet
and water outlet.
Be careful not to deform the unit's piping by using
excessive force when connecting the piping. Deforming
the piping can cause the unit to malfunction.
If air, moisture or dust gets in the water circuit, problems
may occur. Therefore, always take into account the following
when connecting the water circuit:
•
Use clean pipes only.
•
Hold the pipe end downwards when removing burrs.
•
Cover the pipe end when inserting it through a wall to
prevent dust and dirt entering.
•
Use a good thread sealant for sealing the connections.
The sealing must be able to withstand the pressures and
temperatures of the system.
•
When using non-copper metallic piping, be sure to
insulate two kind of materials from each other to prevent
galvanic corrosion.
•
For copper is a soft material, use
appropriate tools for connecting the
water circuit. Inappropriate tools will
cause damage to the pipes.
The unit is only to be used in a closed water system.
Application in an open water circuit can lead to
excessive corrosion of the water piping:
•
Never use Zn-coated parts in the water circuit.
Excessive corrosion of these parts may occur as
copper piping is used in the unit's internal water
circuit.
•
When using a 3-way valve in the water circuit.
Preferably choose a ball type 3-way valve to
guarantee full separation between the domestic hot
water and floor heating water circuit.
•
When using a 3-way valve or a 2-way valve in
the water circuit. The recommended maximum
changeover time of the valve should be less than
60 seconds.
Cod. 3QE47660 - Rev. 00 - 02/2022
22T÷30T
CAUTION
NOTE
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