In the name 3T22, the 3 stands for its three main signals: attack (wail), alert (steady), and hi-lo, and the 22 again stands for the twenty-two cones. The A or B determines whether the motor is three phase or single phase. A 3T22A is three phase, while a 3T22B is single phase.

Mar 21, 2025 · 3 phase units (designated Model 2T22A and Model 3T22A on Federal Signal-era units) are powered by a bare dual sided 7.5 hp or 10 hp AC motor which was originally manufactured by Northwestern Electric for early FS&S models, and by Marathon for later models.

The Federal Thunderbolt 1003 and 3T22 are capable of coding the "Fire" signal using air valves to alternately cycle on and off the air flow through the high and low tones of their dual tone rotors. The 3T22 used air valving on the air intakes of the upper and lower siren rotors.

Aug 18, 2014 · We have a 3T22 siren that will no longer run. It is need of brushes. I have found numerous posts on this site about them needing/being replaced as well as user manuals detailing the process.

On this page I try to explain how the Federal 3T22 and Thuderbolt 1003 sirens work. These two sirens are capable of doing and extra "Fire" signal because they can switch their high and low tones off and on by valving the air going through the siren rotor.

Feb 22, 2011 · Single phase 3T22, 240 VAC, 7 1/2 HP motor. I have replaced the brush springs and brushes. I contored the brushes to the commutator as per Federals instructions.

The fire circuit in the AF timer would activate a cycling switch in the RCM 3 control cabinet (Thunderolt) or the RC6 (3T22) which would operate the Hi-Lo signal of the siren. An explanation of the fire signal operation is shown on the Federal Siren Pictures page.

Oct 8, 2023 · Because of its duel-tone sound and its total of 22 horns, the siren was called 2T22. Federal Signal had another version called the 3T22, which produced a high-low signal by means of shutters that opened and closed alternately over the air intake ports of the siren.

Aug 9, 2010 · There is a 2T22B and 3T22B, and both B motors pull 52-58 amps, 240VAC, 60Hz. I figured I could answer this for you, but since I wasn't entirely sure, I didn't want to say anything without having something to back it up. So, here you go.... Clicky! Here's the tag from my 3T22B.

In the name 3T22, the 3 stands for its three main signals: attack (wail), alert (steady), and hi-lo, and the 22 again stands for the twenty-two cones. The A or B determined whether the motor was three phase or single phase. A 3T22A would be three phase, while a …