Operating Instructions

Laboratory Room Controller Owner's Manual
2-12 Siemens Building Technologies, Inc.
Laboratory Analog Output-Pneumatic Module
The Laboratory Analog Output-Pneumatic (AO-P) Module (P/N 546-00090) is the electro-
pneumatic interface between the Laboratory Room Controller and the pneumatic damper
actuator. The AO-P Module varies the pressure to the pneumatic actuator to move the
damper to its proper position. Refer to Figure 2-12.
The AO-P Module has two solenoid valves. One valve connects the damper motor to main
air; the other valve bleeds it to atmosphere. The bleed valve is normally open so the device
bleeds the actuator if it loses power. Typically, the bleed solenoid is on (closing the valve)
and the supply solenoid is off. In this state the pressure does not change and the damper
does not move.
The AO-P Module also has an AC/DC switch. DC is the recommended position when the
deviceisusedwithanLRC.
Power consumption.................................................................................................... 5 VA total
.......................................................................................................................(2.5 VA pervalve)
Supply pressure range ............................................................................................... 18–30 psi
............................................................................................................................ (124–207 kPa)
Supply requirements with the No. 3 actuator ..............................................@ 20 psi (138 kPa)
...................................................................................................................38 SCIM (10.4 sccs)
LAB00154R1
Figure 2-12. Laboratory AO-P Module.