49
A
B
Fig. 37
A
Primary circuit air vent valves
B
Primary circuit drain & fill valve
!
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
–
15 °C.
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.
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.
Commissioning, inspection, maintenance
Filling and venting the primary side
6153640
