What power supply does the M9174C1025 require?
The M9174C1025 operates on 120 Vac power. The M9174 series also offers 24 Vac models (M9174D1007 and M9174B1043), allowing flexibility in installation depending on available power sources. (Page 19)
From the official Honeywell M9174C1025 Actuator manual, page 19
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