36
CAUTION
If the calculation shows a pressure lower than 0.1 MPa (1 bar), set the pressure of
the expansion vessel to 0.1 MPa (1 bar).
p
0
[MPa (bar)]
– surpressure in the Expansion vessel,
p
0min
[MPa (bar)]
– minimal needed pressure of the heating system,
p
0max
[MPa (bar)]
– maximal allowed pressure of the heating system,
H
[m]
– static height.
Set the surcharge in the expansion vessel by releasing or supplementing dry
nitrogen.
Record the new value of the surcharge
p
0
on the serial label.
Open the closing valve of the Expansion vessel carefully, open the vents and close
the drain.
Filling the heating system
Use the filling valve to fill the system with water of suitable quality to the pressure
p
F
.
,
Filling the system to the final pressure
The final pressure of the system is determined by heating the system to the
maximal heating temperature (thermal degassing).
Turn off the circulation pumps, open the vents and vent the system.
At maximal operating temperature, fill the system to the end pressure which is 0.05
MPa (0.5 bar) lower than the releasing pressure of the safety valve.
],
(
)
p
E
– the end pressure of the system,
p
SV
– the pressure of the safety valve.
3.6 Electrical connection
Connect the internal unit to the mains according to the instructions described in this
chapter.
CAUTION
Connecting the device to the electrical network has to be performed in accordance
with the standards for connecting devices to the electrical network. The device has
to be connected to the electrical network via the power supply cut-off which is
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