51
3.
Check the connections for possible leaks. Replace
faulty or displaced gaskets.
Filling and venting the secondary side
Unsuitable fill and top-up water increases the level of
deposits and corrosion. This can lead to system dam-
age.
Observe VDI 2035 regarding quality and amount of
heating water, including fill and top-up water.
■
Flush the heating system thoroughly before filling.
■
Only fill with water of potable quality.
■
If the fill and top-up water has a water hardness
greater than 16.8 °dH (3.0 mol/m
3
), it must be soft-
ened, e.g. using the small softening system for heat-
ing water: See the Vitoset pricelist.
!
Please note
Escaping liquids can lead to electrical defects.
Protect electrical components of the heat pump
from escaping liquids.
Note
Before
filling the system, observe VDI 2035 sheet 1.
1.
Open any on-site non-return valves if installed.
2.
Check the pre-charge pressure of the expansion
vessel.
3.
Fill (flush) and vent the secondary circuit.
4.
!
Please note
Leaking hydraulic connections lead to appli-
ance damage.
■
Check for leaks in the internal and on-site
hydraulic connections.
■
In the event of leaks, switch off the appli-
ance immediately. Drain off liquid via the
drain valve. Check the seating of seal
rings.
Always
replace displaced seal
rings.
5.
Check system pressure. Top up with water if
required.
■
Minimum system pressure:
0.8 bar (80 kPa)
■
Permiss. operating pressure:
2.5 bar (250 kPa)
Checking expansion vessels and the primary circuit/heating circuit pres-
sure
Observe engineering information.
Technical guides for heat pumps
Checking the electrical connections for firm seating
Commissioning the system
Commissioning (configuration, parameter settings and
function check) can be carried out with or without the
commissioning wizard (see following chapter and serv-
ice instructions for the heat pump control unit).
Note
The type and extent of the parameters depend on the
appliance type, on the selected system scheme and
the accessories employed.
Starting the heat pump
Switch ON the system power supply, e.g. at the sepa-
rate MCB/fuse or at a mains isolator.
Commissioning, inspection, maintenance
Filling and venting the primary side
(cont.)
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