Installation & Operation Manual - Model AVT6000
Page C1
APPENDIX C: ACCUNET
This guide provides a general description of AccuNet™, it’s intended applications and
instructions for performing the field network configuration.
Description
AccuNet™ is a high-speed serial bus that is designed to provide a room-level network for
summing the airflow volume of multiple AccuValves while providing a single analog signal
representing the total sum of the AccuValve airflows.
The primary application for AccuNet is in laboratories that have multiple VAV fume hoods
which require the total lab exhaust airflow to be instantly tracked by the supply airflow to
maintain the proper room pressurization.
Network Design
The AccuNet field network shall be designed and documented with wiring diagrams that are
included as part of the project submittal. The following network design criteria must be strictly
adhered to otherwise the network will not perform as intended:
• Each network must be comprised of AccuValves serving only one lab space.
• Each network shall include no less than two and no more than twenty AccuValves.
• The network shall be wired using Windy City Wire PN: 042002. (or equivalent wire)
• The total cable length of each network shall not exceed 800 ft.
• A 120-ohm resistor shall be installed across the +/- terminals on the AccuNet modules
located on each end of the network.
• Only one AccuValve, referred to as the “Totalizer”, shall be configured to provide the
sum of the individual airflows of each AccuValve located on the network. It’s important
to identify the Totalizer on the network wiring diagram to ensure the analog output is
wired to the lab controller as feedback for the tracking control.
How to Order AccuValves with AccuNet
AccuValve model series AVT6 and AVC6 can be provided with factory-installed AccuNet
modules by including the “-A option” on the model code when placing the order.
Note: It is strongly recommended to save a copy of the Accunet configuration file after the
configuration of each unit and the entire network. This prevents having to rebuild the entire
network if a unit must be replaced due to a failure or upgrade.
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