Commissioning, Inspection, Maintenance - Viessmann VITOCAL 300-G Installation And Service Instructions For Contractors

Filling and venting the primary side
A
B
Fig. 37
Primary circuit air vent valves
A
Primary circuit drain & fill valve
B
!
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 at least
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
16 °C.
–

Commissioning, inspection, maintenance

3. Check the connections for possible leaks. Replace
faulty or displaced gaskets.
Information on setting the primary pump
Temperature differential between primary circuit flow
and return: 3 K to 5 K.
15 °C.
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49