CO₂ Supply Connection
Connecting your CO₂ supply to the FizzWizz CO₂_In port, setting the regulator, and checking for the common regulator problems.
CO₂ supply connection
The FizzWizz takes CO₂ from your regulator into the CO₂_In port. This is the first pneumatic connection to make, and the pressure you set here is the reference for everything downstream.
Requirements
| Requirement | Detail |
|---|---|
| Regulator setting | 30–40 psi |
| Connection point | The CO₂_In port on the unit |
| Supply | Sized for your batch volume and target carbonation — see the flow rate calculator |
Connecting the supply
Power the FizzWizz OFF before connecting or disconnecting any hoses.
Power off
Switch the FizzWizz OFF.
Connect CO₂ to CO₂_In
Connect the CO₂ supply from your regulator to the CO₂_In port.
Set the regulator
Set the CO₂ regulator to approximately 30–40 psi.
Check for leaks
With the supply open, check the connection for leaks. A soapy water solution on the fitting will show bubbles at a leak.
The CO₂ inlet circuit
From the CO₂_In port, gas passes the CO₂ check valve and enters the internal manifold, which distributes it to the three solenoids.
The CO₂ check valve is a one-way valve that prevents reverse flow back toward the regulator if the supply runs out. It matters more than it looks: if it fails or is missing, and the CO₂ supply runs out, product can flow back from the tank toward your regulator.
See the Pneumatics Schematic for the full path and component glossary.
Reading the pressure
Once the unit is powered, CO₂ reg psi on the display shows the pressure at this inlet. In Test Mode it updates live.
A CO₂ reg psi reading that does not match your regulator setting is Health Check Ident A (or Ident R on the ARM circuit) — see By Symptom.
Common problems
| Symptom | Likely cause | Where to go |
|---|---|---|
| Display reading differs from the regulator | Faulty CO₂_In pressure transducer, or a regulator problem | Ident A / R — By Symptom |
| Pressure drops during a run | CO₂ supply running low | Responding to Alerts |
| Gas escaping at the fitting | Loose connection, or a failed push-to-connect fitting | Leak testing |
| No flow into the stone circuit despite pressure at the inlet | CO₂-in solenoid stuck closed, or the flow controller is closed | Ident I — Check 3 |
If flow appears to be blocked, check the flow controller first. A flow meter turned all the way off looks exactly like a stuck solenoid. Rotate the knob counterclockwise and retest before suspecting a component — this is the first action for Ident I and Ident P.
During the Health Check
The Health Check moves the CO₂ supply between ports to isolate faults:
- Checks 2 and 3 use CO₂ connected to
CO₂_In - Check 4 moves CO₂ to the ARM port and repeats the solenoid tests — the expected results swap, which is the point of the test
- Checks 6 and 7 move CO₂ back to
CO₂_In
A push-to-connect jumper hose makes these moves quick. See the Health Check Overview for the prerequisites.
Next step
Stone Circuit
Connect the stone hose, isolation valve, and carbonation stone.