Application

Sequence of Operation
Wiring Diagram
11
Siemens Industry, Inc. Application Note, App 2051 140-1137
2014-05-01
Wiring Diagram
CAUTION
The controller’s DOs control 24 Vac loads only. The maximum rating is 12 VA for
each DO. An external interposing relay is required for any of the following:
• VA requirements higher than the maximum
• 110 or 220 Vac requirements
• DC power requirements
• Separate transformers used to power the load
(for example part number 540-147, Terminal Equipment Controller Relay Module)
Application 2051 – Fan Coil Unit Cooling and Heating.