Setting The Pre-Pressure Of The Expansion Vessel; Calculating The Pre-Pressure Of The Expansion Vessel - Samsung AE090MNYDEH Installation Manual

Setting the pre-pressure of the expansion vessel

When it is required to change the default pre-pressure of the expansion vessel(1 bar), keep in mind the following guidelines:
• Use only dry nitrogen to set the expansion vessel pre-pressure.
• Inappropriate setting of the expansion vessel pre-pressure will lead to malfunction of the system. Therefore, the pre-pressure
should only be adjusted by a licensed installer.
CAUTION
• Water volume of total system for reliable performance is minimum 50 liters.
Installation height
difference
a)
< 7 m
> 7 m
a) Installation height difference: height difference(m) between the highest point of the water circuit and the indoor unit. If the
indoor unit is located at the highest point of the installation, the installation height is considered 0 m.

Calculating the pre-pressure of the expansion vessel

The pre-pressure(Pg) to be set depends on the maximum installation height difference(H) and is calculated as below:
Pg=(H/10+0.3) bar
Expansion Vessel capacity (Liter)
14.00
12.00
Norminal
10.00
8.00
6.00
4.00
2.00
0.00
50 100 150 200
Water volume (Litre) in total system including pipes
< 220 Litres
No pre-pressure adjustment required.
Actions required:
• Pre-pressure must be increased, calculate
the appropriate value following by
"Calculating the pre-pressure of the
expansion vessel".
• Check if the water volume is lower than
maximum allowed water volume
Operation range
250 300 350 400
Water volume
> 220 Litres
Actions required:
• Pre-pressure must be decreased, calculate
according to "Calculating the pre-pressure
of the expansion vessel".
• Check if the water volume is lower than
maximum allowed water volume
Expansion vessel of the unit too small for the
installation.
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