If you are at sea level and 34 degrees, 12 PSIG. 36 degrees - 13 PSIG and 38 degrees - 14 PSIG. Calibrate your thermometer, pour out three beers in the same glass and take a temperature. Your beer will taste best at 38. To decarbonate your setzer beer, turn off pressure to coupler but leave in coupled position. Shake keg and pull release valve on coupler. This will degass keg. You will risk shaking down the keg to far and result will be flat beer.
Scott Zuhse, Instructor
Micro Matic Dispense Institute