Operating Instructions

Product Overview

Siemens Building Technologies, Inc. 11

Figure 14. Pneumatic Damper Actuator.

Analog Output-Pneumatic (AO-P) Module

The Analog Output-Pneumatic (AO-P) Module is an electric-to-pneumatic interface between

the Fume Hood Controller and the damper actuator. The AO-P Module translates electrical

signals from the Fume Hood Controller into pneumatic signals that command the damper

actuator. The AO-P Module consists of two industrial grade air valves that supply or bleed air

to the damper actuator by using a pulse modulation technique. See Figure 15. Minimum air

supply to the AO-P Module is 18 psi and the maximum is 30 psi. The valves are rated for 24

Vac.

5.00" (127.0mm)

3.70"

(94.0mm)

SUPPLY

COMMON

EXHAUST

SUPPLY

(SUPPLY)

18-30 PSI

(ACTUATOR)

EXHAUST

FUM0240R1

Figure 15. AO-P Module.

NOTE: While the damper is being commanded, you may hear a hissing or clicking sound

coming from the AO-P module. This is due to the movement of the air valves and

the bleeding of air from the actuator. This is normal operation.