55
Step 5: Set the VPRV 0.25 bar higher than the gas cylinder
setting and brew at this pressure (see below for more details on
setting the VPRV).
For example, we recommend that first time users carbonate to
the high end of the range for lagers, which is 6 g/l, and set a
drinking temperature of 5°C. Reading from Chart 1, the 5°C
line intersects with 6 g/l (the x-axis) at 1.25 bar on the y-axis.
Therefore the required dispense pressure on the gas cylinder is
1.25 bar. The VPRV must then be set 0.25 bar higher than this
at 1.5 bar which is the pressure during fermentation that you
need to control to.
VESSEL PRESSURE CONTROL DURING THE BREWING
PROCESS TO ACHIEVE THE FINAL CARBONATION LEVEL
Chart 2 shows the pressure in the vessel during a typical 7 day
ale brewing as described above.
During fermentation you will need to fine-tune the VPRV setting to
achieve the vessel pressure required. E.g. 1.5 bar for first-timers.
After cooling, the pressure will reduce about 0.25 bar, to about
1.25 bar in this example.
During clarification, you will then release pressure out of the
VPRV by pressing on the release button, to achieve a vessel
Example of Vessel Pressure
for the 7 Day Process
0
0.25
0.50
0.75
1.00
1.25
1.50
1.75
0
1
2
3
4
5
6
7
P
R
ESS
UR
E
(
B
A
R)
DAY
Fermentation
Cooling
1
st
Clarification
2
nd
Clarification
pressure of 0.75 bar, in order to create a 0.5 bar pressure
differential between the vessel and the gas cylinder (which is set
at 1.25 bar in this example for first-timers). You will then turn
the 3-way valve to the clarification pot with clarification agent
in it and this will bubble the agent into the beverage which will
CO
2
Level g/L
13 / 55.4
12 / 53.6
11 / 51.8
10 / 50
9 / 48.2
8 / 46.4
7 / 44.6
6 / 42.8
5 / 41
4 / 39.2
3 / 37.4
2 / 35.6
1 / 33.8
Temp °C / °F
CO
2
Levels from Pressure vs Temperature
Tank Pressure (BAR)
CHART 2
Example of Vessel Pressure
for the 7 Day Process
CHART 1
