They list the optimum fermentation temp for the Red Star Champagne yeast as 59-86, and recommend 68F as optimum. 55F is likely a bit too cold, and the yeast are dormant. You need to warm it up to at least 60ish, and the fermentation will be fine.
Primary #1 - Midnight Ryeder (Midnight Wheat and Rye)
Primary #2 - Florida Weiss
Primary #3 - Kane-DOH APA (Honey Citra APA)
Secondary #1 - Downtown Flanders Brown (brewed August 2012)
Keg #1 - Raspberry Florida Weiss
Keg #2 - Cinnamon Raisin Cider
Keg #3 - NONE!
Bottled - NONE!