Installation Instructions

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Document No. 550-169

October 26, 2016

Fume Hood Controller

Item No. 550-169. Rev. CA Page 1 of 9

Generic Controller I/O Layout. See Wiring Diagram for application specific details.

Control Applications

2940, 2941 and 2942

Product Description

These instructions explain how to field install or

replace the Fume Hood Controller FHC.

This Fume Hood Controls a Fast-acting Damper or

Venturi Air Valve to maintain control of a chemical

fume hood with up to 2 sashes. It uses fast-acting

electronic actuators (shipped separately) to control

the exhaust control device.

WARNING

The application cannot detect a

broken wire to the analog input

for the second sash.

An external sash aggregating

device should be used to

calculate the face area for all

fume hoods with more than one

sash.

This controller supports up to two Offboard AVS

signals. Offboard Air Module(s) (OAM) house AVS

transducers and send signals to the AVS input(s) on

the controller board. The controller can operate

stand-alone, with a field panel, or as part of a

network.

Summary of content (9 pages)

PAGE 1
Installation Instructions Document No. 550-169 October 26, 2016 Fume Hood Controller Generic Controller I/O Layout. See Wiring Diagram for application specific details. Control Applications 2940, 2941 and 2942 Product Description These instructions explain how to field install or replace the Fume Hood Controller FHC. This Fume Hood Controls a Fast-acting Damper or Venturi Air Valve to maintain control of a chemical fume hood with up to 2 sashes.
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Document No.
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Document No. 550-169 Installation Instructions October 26, 2016 CAUTION It is important that the neutral that supplies the TEC must be earth grounded at the source of the 24 Vac power. Possible erratic equipment operation or damage if neutral is not grounded. 10. 6. If the controller requires Offboard Air Modules, install them now following the appropriate Installation Instructions (see Product Numbers).
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Document No. 550-169 Installation Instructions October 26, 2016 Wiring Diagrams Offboard Air Module Wiring. CAUTION The FHC-OAVS has two terminal blocks with terminations numbered identically (terminations 1 through 16). DO NOT get these mixed up with each other. If the FHC-OAVS is not connected as shown, it is not resistant to electrical surges. It is also susceptible to interference from other equipment. CAUTION A separate power supply is required if a 4-20 mA sensor is used.
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Document No. 550-169 Installation Instructions October 26, 2016 CAUTION NOTE: When wiring any actuator that uses a 0 to 10V control signal and ties AC neutral to DC common, an additional wire must connect the actuator AC neutral to the DC common of the PTEC/TEC AO being used to control the actuator. Each 4-20 mA sensor requires a SEPARATE dedicated power limited 24 Vdc power supply. DO NOT use the same transformer to power both the sensor and the controller.
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Document No. 550-169 Installation Instructions October 26, 2016 Application 2940 Wiring Diagram. Page 6 of 9 Siemens Industry, Inc.
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Document No. 550-169 Installation Instructions October 26, 2016 Application 2941 Wiring Diagram. Siemens Industry, Inc.
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Document No. 550-169 Installation Instructions October 26, 2016 Application 2942 Wiring Diagram. Page 8 of 9 Siemens Industry, Inc.
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Document No. 550-169 Installation Instructions October 26, 2016 Cyber security disclaimer Products, solutions and services from Siemens include security functions to ensure the secure operation of building automation and control, fire safety, security management, and physical security systems. The security functions on these products, solutions and services are important components of a comprehensive security concept.