Filling And Venting The Primary Side; Filling And Venting The Secondary Side - Viessmann Vitocal 222-G Installation And Service Instructions Manual

Filling and venting 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 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.
■
■ Soften fill water with a water hardness above
3
16.8 °dH (3.0 mol/m ), e.g. with the small softening
system for heating water: See the Vitoset pricelist.
3. Check the connections for possible leaks. Replace
Information on setting the primary pump
Temperature differential between primary circuit flow
and return: 3 K to 5 K
19 °C.
–
!
Commissioning, inspection, maintenance
faulty or displaced gaskets.
Please note
Escaping liquids can lead to electrical defects.
■ Protect electrical components of the heat
pump from escaping liquids.
■ Connect the hose to the air vent valve of the
secondary circuit: see Fig. 36.
39