Filling And Venting On The Primary Side; Filling And Venting On The Secondary Side; Checking Expansion Vessels And The Primary Circuit/Heating Circuit Pressure; Checking The Electrical Connections For Firm Seating - Viessmann Vitocal 300-G Series Installation And Service Instructions Manual

Filling and venting on the primary side

!
Please note
Commissioning when the primary circuit is
empty causes appliance damage.
Charge and vent the primary circuit before con-
necting the power supply.
1. Check the pre-charge pressure of the expansion
vessel.
2. Charge the primary circuit with Viessmann heat
transfer medium and vent.
Note
Ensure frost protection down to
Viessmann heat transfer medium is a ready-mixed
ethylene glycol-based medium. It contains inhibi-
tors for corrosion protection. The heat transfer
medium can be used at temperatures down to
19 °C.
–

Filling and venting on 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

3. Check the connections for possible leaks. Replace
19 °C.
–
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.
5. Check system pressure. Top up with water if
Commissioning, inspection, maintenance
faulty or displaced gaskets.
!
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.
required.
■ Minimum system pressure:
0.8 bar (80 kPa)
■ Permiss. operating pressure:
2.5 bar (250 kPa)
3 ), it must be soft-
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