61
HYDRAULIC CONNECTION FOR INDOOR UNIT
ENGLISH
Setting the pressure for the expansion vessel p
0
• Before filling the system with water, check and set the pressure p
0
. The expansion vessel is
factory set to the pressure specified on its data label. For correct operation of the system, set
the pressure p
0
according to the equation below. The filling must not exceed the maximum
operational pressure specified on the data label of the expansion vessel.
• Calculate the p
0
pressure value with the help of the equation:
p
0
[bar]= H[m]/10 + 0,2 [bar]
p
0
[bar]
– pressure in the expansion vessel
p
0
min [bar]
– minimum allowable pressure of the heating system
p
0
max [bar]
– maximum allowable pressure of the heating system
H[m]
– Height of the heating system (from expansion vessel to the highest heating body in the
building).
If the calculation shows a pressure lower than 1 bar, set the pressure of the expansion vessel to
1 bar.
• Set the amount of pressure in the expansion vessel by releasing or adding dry nitrogen.
• Record the new value of the pressure p
0
on the data label.
• Open the closing valve of the expansion vessel carefully, open the vents and close the drain.
CAUTION
!
• For normal operation of the expansion vessel, it is necessary to perform proper
adjustments of the vessel’s working pressure. The integrated vessel is supplied with a
factory pre-charge of 0.75 bar. The settings have to be checked every 12 months.
• Consider the maximal operational pressure of the vessel.
• Unsuitable charge of the expansion vessel with the pressure p
0
is the reason for incorrect
operation of the heating system.
H - Height of the heating system
p
sv
- Pressure of the safety valve.