Filling And Venting The Secondary Side; Checking Expansion Vessels And The Primary Circuit/Heating Circuit Pres- Sure; Commissioning The System - Viessmann VITOCAL 350-G Series Installation And Service Instructions For Contractors

Filling and venting the primary side
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.
!
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.
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).
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
(cont.)
■ 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
ened, e.g. using the small softening system for heat-
ing water: See the Vitoset pricelist.
!
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)
Note
The type and extent of the parameters depend on the
appliance type, on the selected system scheme and
the accessories employed.
3
), it must be soft-
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