Viessmann VITOCAL 250-A - Float Air Vent Valve; Design; Separation of Refrigerant from the Heating Water

47
The refrigerant circuit in the outdoor unit contains the
flammable refrigerant R290 (propane). This refrigerant
can form explosive mixtures with the ambient air.
If refrigerant enters the heating water due to a leak in
the refrigerant circuit, this refrigerant is separated from
the heating water using the float air vent valve. This
prevents refrigerant from entering the interior of the
building via the heating water.
The separated refrigerant is discharged to the outside
in controlled amounts so that no explosive mixtures
are created in the vicinity of the outdoor unit.
This safety concept complies with the requirements of
EN 60335-2-40, which limits the maximum amount of
refrigerant that can enter a building to 150 g.
!
Please note
Repairing components that fulfil a safety func-
tion can compromise the safe operation of the
system.
Only replace the float air vent valve and quick-
action air vent valve with original Viessmann
parts. If other spare parts are used, the heat
pump will lose its approval.
Design
A
B
C
A
B
C
Fig. 15
A
Quick-action air vent valve
B
Float air vent valve designs
C
Float
Separation of refrigerant from the heating water
If heating water containing refrigerant flows into the
float air vent valve, the gaseous refrigerant separates
from the heating water and collects in the upper area.
This pushes the float downwards.
Function description
Float air vent valve
6218234
Functions