Installation Instructions

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Document No. 570-108

February 17, 2017

BACnet Fume Hood Controller

Item No. 570-108. Rev. CA Page 1 of 6

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

Control Applications

6740, 6741 and 6742

Product Description

These instructions explain how to field install or

replace the BACnet Fume Hood Controller FHC.

This BACnet 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.

This controller is built on a BACnet Programmable

TEC (PTEC) platform that 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.

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.

Product Numbers

BACnet Fume Hood Controller

This controller requires Offboard Air

Module(s) (ordered and shipped

separately

570-00701

Offboard Air Module – order separately

550-819B

Operator Display Panel II (ODP II)

575-820A

Power Module

AQM2200

Siemens fast-acting Lab Electronic

Actuator(s) – order and ship separately)

GNP191.1U

Summary of content (6 pages)

PAGE 1
Installation Instructions Document No. 570-108 February 17, 2017 BACnet Fume Hood Controller Generic Controller I/O Layout. See Wiring Diagram for application specific details. WARNING Control Applications 6740, 6741 and 6742 Product Description These instructions explain how to field install or replace the BACnet Fume Hood Controller FHC. This BACnet Fume Hood Controls a Fast-acting Damper or Venturi Air Valve to maintain control of a chemical fume hood with up to 2 sashes.
PAGE 2
Document No. 570-108 Installation Instructions February 17, 2017 Shipping carton includes a controller assembly, a mounting rail, and two self-tapping/drilling screws. Prerequisites  Wiring conforms to NEC and local codes and regulations. For further information see the Wiring Guidelines Manual.  24 Vac Class II power available.  Supply power to the unit is OFF.  Any application specific hardware or devices installed.  Fume Hood Controller Enclosure is mounted and wiring has been roughed-in.
PAGE 3
Document No. 570-108 Installation Instructions February 17, 2017 CAUTION It is very important that the neutral that supplies the TEC be earth grounded at the source of the 24 Vac power. Possible erratic equipment operation or damage if neutral is left floating. 6. If the controller requires Offboard Air Modules, install them now following the appropriate Installation Instructions (see Product Numbers). 7. Connect the point wiring (see Wiring Diagrams). CAUTION 10.
PAGE 4
Document No. 570-108 Installation Instructions February 17, 2017 CAUTION A separate power supply is required if a 4-20 mA sensor is used. Failure to follow wiring precautions will result in equipment damage. Dimensions. Wiring Diagrams CAUTION Controllers will be damaged/destroyed if offboard air module(s) are not wired correctly and power is applied. Wiring for AI5: Sash Sensor 1. Offboard Air Module Wiring.
PAGE 5
Document No. 570-108 Installation Instructions February 17, 2017 Wiring for AI with a 4 to 20 mA Sensor. NOTE: If the voltage/current switch is set to current and a 4 to 20 mA sensor is connected to an AI, then special wiring requirements must be followed. CAUTION The controller’s DOs control 24 Vac loads only. The maximum rating is 12 VA for each DO.
PAGE 6
Document No. 570-108 Installation Instructions February 17, 2017 Application 6741 Wiring Diagram. Application 6742 Wiring Diagram. Information in this document is based on specifications believed correct at the time of publication. The right is reserved to make changes as design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective owners. © 2017 Siemens Industry, Inc.