STEP 2: Cool down your wort in the fermenter after brewing.
We needed a cooling coil inside of the Fermzilla and an external cooling system. We decided to use a freezer, in the freezer we put a bucket with a mix of glycol (food grade 99,5%) and demineralized water. Now we had to get the cold liquid to the spiral in the fermenter. First we removed the lid of the freezer and built a wooden frame between the lid and the freezer itself. After that we were able to drill holes through the wood for the hoses. We put a pump in the bucket with the cold liquid, connected the hoses to the pump, through the wood and connected it to the coil. Fixing the leaks between the hoses was a challenge because we had to convert from a 25mm hose to a 10mm hose. For this we used different convert parts and in the end we had it working. Don’t forger isolating the hoses because it will limit your cooling capacity.
STEP 3: Control temperature during fermentation, cooling and heating
As we wanted our temperature controller to be remote controlled we chose to use the Inkbird Wifi thermostats. We have great experiences with these products with the other climate controlled fridges. The best thing is that we can control the fermentation on our smartphones, anywhere, anytime!
STEP 4: Pressurize after aerating and control pressure
The CO2 bottles we use for carbonizing the beer and doing a pressurized transfer are the small ones from the Soda Stream brand. They are small, lightweight and easy to use. They work perfectly! You can always buy a big CO2 tank at your local brewstore.
StTEP 5: Remove yeast and trub after primary fermentation
Underneath the fermenter there is a small yeast container to collect or remove the trub after primary fermentation. Also we used this to add a dryhop and to harvest yeast for our next batch. The butterfly valve is used to open or close the collection jar.
STEP 6: Cold crashing the unitank
After lagering we cold crash by setting the inkbird to 3-5 degrees celsius. This means the pump will start and pump the cold liquid through the coil until the wort is cold enough.
STEP 7: Transfer the beer to kegs or bottles
Transfering the beer to kegs needs to be done using a forced carbonation method. This way we can purge the beer from the Fermzilla unitank into the corny kegs. Besides kegging the beer we can directly fill bottles using a counter pressure bottle filler. Therefore we are installing a Boel Itap Counter Pressure Bottle filler as soon as possible!