Filling And Venting The Solar Circuit; Checking Expansion Vessels And The Primary Circuit/ Heating Circuit Pressure - Viessmann Vitocal 300-G Installation And Service Instructions For Contractors

Commissioning, inspection, maintenance
Further details regarding the individual steps
!
4. Please note
To prevent equipment dam-
age, check the flow and return
connections of the secondary
heat pump circuit for leaks.
In case of leaks, immediately
shut off the equipment, drain
the water and check the seat-
ing of the seal rings. Replace
any seal rings that may have
become dislodged.

Filling and venting the solar circuit

Danger
Overheated collector areas and
overheated heat transfer medium
can cause burns/scalding and
equipment damage.
When working on the collector
and the solar circuit with heat
transfer medium, protect the col-
lector areas against solar irradia-
tion.
1. Check the pre-charge pressure of the
expansion vessel.
Checking expansion vessels and the primary circuit/heating cir-
cuit pressure
Observe design information.
Vitocal technical guide
106
(cont.)
5. Check the system pressure and top
up with water if required.
Minimum system pressure: 0.8 bar
Permiss. operating pressure: 2.5 bar
!
2. Please note
To prevent equipment dam-
age,
only fill the solar circuit with
Tyfocor LS.
3. Vent the solar circuit.
Minimum system pressure: 1.7 bar
Permiss. operating pressure: 6 bar