Installation Instructions

Document No. 546-00335

December 8, 2011

Page 4 of 5 Siemens Industry, Inc.

Figure 6. AO-P Transducer Wiring Connections.

Figure 7. Differential Pressure Transmitter Wiring

Connections.

5. Connect a two-conductor 20 AWG cable to the

field panel’s 4 to 20 mA input or UC’s universal

input. Connect it to the differential pressure

transmitter or through the wiring

bushing/knockout on the controls enclosure to the

differential pressure transmitter inside the

enclosure. Connect the cable to the differential

pressure transmitter (Figure 7).

Fume Hood Controllers (FHCs)

Provision of the 18 to 30 psi Supply Air

Connection

One supply air connection must be made to the

FHET to operate the pneumatic damper.

1. Use 1/4-inch OD poly tubing for an 18 to 30 psi

supply air line to the FHET equipment enclosure.

2. Connect the supply air line to the barbed supply

inlet port on the side of the equipment enclosure

(See Figure 8).

Figure 8. FHET Pneumatic Piping Connection.

Wiring the AO-P Module and Differential Pressure

Transmitter to the Fume Hood Controller Board.

1. Remove the equipment enclosure cover by

loosening the quick release butterfly fasteners.

The butterfly fasteners will remain attached to the

cover.

2. With the equipment enclosure cover removed,

locate the Lab AO-P module and the differential

pressure transmitter. (Figure 9).

Figure 9. Equipment Locations.