Siemens 125-1957 User Manual
Introduction
Siemens Building Technologies, Inc.
3
Hardware Outputs
Analog (0 to 10V)
Application
• Cooling valve actuator
2281, 2283, 2287
• Face-bypass damper actuator
2281, 2283, 2284, 2286
• Heating valve actuator
2281, 2283, 2284, 2286, 2287
• Outdoor air damper actuator
2281, 2283, 2284, 2286
Digital
Application
• Auxiliary radiation electric coil contact; or,
auxiliary radiation two-position valve actuator
2281, 2283, 2284, 2286
• Unit
fan
2281, 2283, 2284, 2286, 2287
• First stage electric heat
2281, 2283, 2284, 2286
• Second stage electric heat
2281, 2283, 2284, 2286
• Third stage electric heat
2281, 2283, 2284, 2286
• Two-position cooling valve actuator
2281, 2283, 2284, 2286
• Two-position heating valve actuator
2281, 2283, 2284, 2286
• DX
coil
2284, 2286, 2287
Power Wiring
The controller is powered by 24 Vac and connects to the two screw terminals on the
controller. Labeled “C” (Common) and “H” (Hot) on the terminal block labeled “24 VAC”. No
earth-ground connection is required (Figure 2).
controller. Labeled “C” (Common) and “H” (Hot) on the terminal block labeled “24 VAC”. No
earth-ground connection is required (Figure 2).
Communication Wiring
The controller connects to the field panel by means of a Floor Level Network (FLN) trunk.
Communication wiring connects to the three screw terminals on the controller labeled “+”
(positive), “-“ (negative), and “S” (Shield) (Figure 3).
Communication wiring connects to the three screw terminals on the controller labeled “+”
(positive), “-“ (negative), and “S” (Shield) (Figure 3).