Carnes AVRA Installation Manual

READ AND SAVE THESE INSTRUCTIONS

INSTALLATION and OPERATION MANUAL

PRESSURE VALVE

Model AVRA

COPYRIGHT © 2010

All Rights Reserved

18643

Model AVRA

CARNES COMPANY 448 S. Main St., P. O. Box 930040, Verona, WI 53593-0040 Phone: [phone] Fax: [phone] www.carnes.com

INSPECT UNIT

UNPACKING AND INSPECTION

1. Open shipping carton and check for concealed

shipping damage. Report damage immediately to the
carrier that delivered the shipment.

2. Inspect the unit for loose or missing components.

3. Optional accessories may be packed within the unit or

in the same shipping carton

INSTALLATION

GENERAL

1. Each VAV unit and accessory is shipped with an

identification label showing the Carnes order number,
unit item number from the order, unit model number,
maximum and minimum CFM Setting on terminal units
with pressure independent control options, and unit
tagging (or mark).

MOUNTING THE AVRA TERMINAL UNIT

1. The diameter of the inlet duct in inches must be equal

to the listed size of the AVRA Terminal Unit, e.g., a
duct diameter that measures six (6) inches must be
fitted to a unit Size 06.

2. It is preferred that the installer attempt to obtain a
minimum of three (3) inlet diameters of straight duct
ahead of the terminal unit inlet. (Figure 2)

NOTE: Close coupling the terminal unit inlet to the side of

the main duct is not recommended. (Figure 3)

Figure 3

Figure 2

MAIN DUCT

SUPPLY

3D

MIN

D

STRAIGHT DUCT UPSTREAM

FORM 18643, Page 2

CLOSE COUPLING NOT RECOMMENDED

CARNES COMPANY, VERONA, WISCONSIN

ORDER ITEM

MODEL
MAX. CFM / MIN. CFM
MARK

PRESSURE VALVE PLACEMENT

1. Determine if the unit will be used as By-pass Pressure
Control or Discharge Pressure Control. By-pass
Pressure Control will open the valve to relieve
excess pressure to a return or plenum. Discharge
Pressure Control will close the valve decreasing

pressure being delivered to downstream air devices.

2. If By-pass Pressure Control is used, mount the unit
off to the side of the main duct as far downstream

from the central fan as possible but still upstream of
any air devices. If Discharge Pressure Control is
used, mount the unit inline with the main duct as far
downstream from the central fan as possible but still
upstream of any air devices. See Figure 1 for a
sample layout.

Figure 1

By-pass Pressure Control

Discharge Pressure Control