MNB-V1
Figure-1 MNB-Vx Mounting Dimensions.
MNB-V2
MicroNet BACnet
VAV Controllers
Installation Instructions
Application
The TAC I/A Series® MicroNet™
BACnet™ VAV (Variable Air
Volume) Controllers are
interoperable controllers with native
BACnet MS/TP communications
support. All models incorporate: an
integral actuator with manual
override; an integral, patented,
pressure transducer; three
SW24H1
SW24H2
SW24H3
24H
24G
GND
STATUS
MSTP RCV
MSTP XM
AO
S-LK/COM
COM
UI
DI
S-LK
LON
LON
T
universal inputs; Sensor Link
(S-Link) support; LED status
indication; and over-the-shaft damper mounting. See the
model chart, below, for optional features.
Model Chart
Model
Number
MNB-V1 300
MNB-V2 313
Inputs and Outputs
UI UO DO (Triacs)
Installation
Inspection
Inspect carton for damage. If damaged, notify carrier
immediately. Inspect controllers for damage upon receipt.
Requirements
• Installer must be a qualified technician
The following items are not provided.
• Job wiring dia grams
• Tools:
– 1/8 inch allen wrench
– Screw drivers
– 1/4 inch hex driver for travel adjustment screws
– Pliers for turning damper shafts
– Digital Volt-ohm meter (DVM)
– Drill and bits for mounting screw
– Static protection wrist strap
– Torque wrench (capable of measuring at least
70 lb-in (8 N-m))
• MNA-FLO-1 enclosure for connecting to conduit (optional)
• AM-135, 3/8 in. (9.5 mm) to 1/2 in. (12.8 mm) shaft
adapter (optional)
• MS/TP trunk end-of-line termination resistor kit,
120 ±5%, part number 40-1758.
• Spacer or shim for anti-rotation bracket (if needed)
• One #10 sheet metal screw for anti-rotation bracket
• Class 2 power transformer supplying a nominal 24 Vac,
sized appropriately for the controller (15 VA) plus the
anticipated Digital Output (DO) loads. In European
Community, transformer must conform to EN 60742
• 0.170 in. (4.3 mm) I.D. FRPE polyethylene tubing or
0.125 in. (3.2 mm) I.D. Tygon
®
tubing for piping
connections. Not more than 5 ft (1.52 m) long.
Precautions
When installing the MNB-Vx controller, be sure to
follow the guidelines outlined in "Precautions" on
page 4.
Location
The MNB-Vx controllers are suitable for indoor use only.
Caution:
• Avoid locations where excessive moisture, corrosive
fumes, vibration, or explosive vapors are present.
• Avoid electrical noise interference. Do not install near
large contactors, electrical machinery, or welding
equipment.
• Locate where ambient temperatures do not exceed
131°F (55°C) or fall below 32°F (0°C) and relative
humidity does not exceed 85% or fall below 5%,
non-condensing.
Mounting location must clear the maximum dimensions of the
controller case and allow the controller to be mounted flush to
the surface of the terminal box and perpendicular to the
damper shaft.
Dimensions
Mounting dimensions are shown in Figure-1.
6-1/4 (159)
4-1/2
(114)
1-3/4
(44)
5-3/4
(146)
2-1/2 (63)
7-3/4
(197)
Dimensions shown
are in inches (mm).
Printed in U.S.A. 02-10 © 2010 Schneider Electric. All rights reserved. F-27346-4
Mounting Mount the controller to the damper according to the instructions in Figure-2.
SW24H1
SW24H2
SW24H3
24H
24G
GND
STATUS
STP RCV
PXMT
UO1
COM
UI1
COM
UI2
UI3
S-LK/C
OM
S-LK
MSTP +
MSTP -
SHLD
Figure-2 MNB-Vx Damper Mounting.
Warning: Electrical shock hazard! Disconnect power before installing or removing the
cover.
1 Slide the controller onto the damper
shaft and mount the controller as
shown, making sure it is on a plane
that is perpendicular to the damper
shaft. See notes through .
1 4
3 Press the manual override button and turn the
output shaft to the full CCW position. If necessary,
rotate the output shaft slightly to return the button
to the fully extended position.
For CW (closed) position, turn the output shaft
fully CW.
2 Turn the damper shaft to the
full CCW (closed) position.
For CW (closed) position,
4 Finish mounting the controller to
the damper as shown, referring
to notes and .
turn the damper shaft fully CW.
1 Check that the position selected for the mounting
hole does not interfere with the operation of the
damper.
2 Some terminal boxes have sheet metal screw
heads or other protrusions near the damper shaft.
In these cases, add a spacer or shim (not provided)
under the controller's anti-rotation bracket to make
the controller perpendicular to the shaft.
3 The anti-rotation bracket is pre-installed in the
controller slot when shipped.
4 Caution: Use the anti-rotation bracket when direct-
mounting the controller onto a damper shaft. Do not
rigidly mount the controller to the damper. Position
the anti-rotation bracket so that the controller can
float, to ensure that the controller's output shaft can
turn freely through its full stroke, without binding.
5
If necessary, loosen and slide the CW travel
adjustment screw to the desired position, and then
tighten the screw.
For CW (closed) position, reposition the CCW
travel adjustment screw.
6 If preloading the damper for closed position is
required, set the controller as follows:
a. Rotate the controller CW approximately 3/16"
(4 mm) off the centerline of the damper (see
view below) and then tighten the output shaft set
screws 60 - 70 lb-in. (6.8 - 7.9 N-m), using an
1/8" allen wrench.
For CW (closed) position
, rotate the controller
CCW (see view below).
b. Rotate the controller back into alignment with
the centerline of the damper. This should ensure
closure of the damper.
CCW Closed
CW Closed
5 6
MSTP XM
MSTP RCV
STATUS
GND
24G
T
SHLD
MSTP -
S-LK/COM
S-LK
Output
Shaft
CW Travel
Adjustment Screw
24H
SW24H3
SW24H2
SW24H1
UI3
COM
UI2
UI1
COM
UO1
Travel
Indicator
Pin
#8 (4 mm) Sheet
Metal Screw
(not provided)
1
5
Short Shaft
Set Screw
Locations
Manual Override
Slot
Damper
Damper
Shaft
Set Screws (2)
60 - 70 lb-in. (6.8 - 7.9 N-m).
CCW Travel
Adjustment Screw
5
Button
Anti-rotation
Bracket
432
5 When finished, verify free movement of the damper as follows:
Press and hold the manual override button.
a.
b. Verify that the damper can be freely positioned between full open and full
closed. There must be no binding between the controller and damper, and
3 3
3/16" (4 mm)
(approx.)
3/16" (4 mm)
(approx.)
the damper must be free of obstructions that may hinder its operation.
c. Release the manual override button. If the button does not fully extend, it
will do so automatically once power is applied to the controller. The button
may also be made to fully extend by rotating the output shaft slightly.
2 © 2010 Schneider Electric. All rights reserved. F-27346-4
Differential (Velocity)
Figure-3 Connection of Differential Pressure Sensor.
Pressure Sensor
Connections
1 Remove the plastic caps from
the barbed fittings.
2 Connect the tubing to the two
barbed fittings on the controller.
3 Connect the tubing from the
controller's P1 fitting to the low
pressure tap on the VAV terminal.
4 Connect the tubing from the
controller's P2 fitting to the high
pressure tap on the VAV terminal.
Terminal Flow
Measuring Pickup
HI
Inlet
0.0075" (190.5 µm)
Restrictors AT-532-222-1-1
are only required when
differential (velocity)
pressure gauge is present.
LO
(LO) (HI)
Connect the MNB-Vx controller’s built-in pressure sensor to the VAV terminal as shown in
Figure-3.
2
2
P1 P2
HI
VAV Air Terminal
Discharge
Air
Duct
Flow
LO
Differential (velocity) pressure
gauge for Calibration (Magnehelic).
FRPE or Tygon
Tubing (2)
Barbed Fittings (2) from
Differential (Velocity)
Pressure Sensor
1 Use either 0.170 in. (4.3 mm) I.D. FRPE polyethylene
tubing, or 0.125 in. (3.2 mm) I.D. Tygon tubing, for piping
connections. Maximum length of tubing is 5 ft (1.52 m).
2 Use a differential (velocity) pressure gauge to calibrate
and verify that the central system is providing adequate
pressure. The diagram, below, shows connections for
attaching the gauge. When removing the gauge, be sure
to plug the restrictors or remove them from the tubing.
1
24H3
SW
24H2
SW
24H1
SW
24H
24G
GND
COM
S-LK/COM
S-LK
LON
LON
AO
UI
DI
Controller Addressing
DIP Switch
Each MicroNet BACnet controller is equipped with a DIP switch for setting the controller’s
MS/TP network address. Once the address is set, the network is properly wired, and all
routers are configured, WorkPlace Tech Tool (must be version 5.0 or greater) and other
Schneider Electric tools will be able to “see” and work with all the networked BACnet
devices. For guidance in assigning a DIP switch setting that will optimize system
performance, refer to the WorkPlace Tech Tool 5.0 Engineering Guide Supplement,
F-27356.
Other BACnet Devices
The UNC and other BACnet devices on the network can work with the MicroNet BACnet
controller once they are assigned unique identifiers and names. MicroNet BACnet
controllers are configured in this way through the Commissioning Tool.
Note: The logical addressing of devices (i.e. the assignment of unique identifiers and
names) is not a prerequisite for using Schneider Electric network management tools. It is,
however, a prerequisite for using the UNC and third-party BACnet devices with MicroNet
BACnet controllers.
EOL Termination
If the controller is at the end-of-line on the MS/TP trunk, set termination according to the
MicroNet BACnet Wiring and Networking Practices Guide, F-27360, using an end-of-line
termination resistor kit, 120 ±5%, part number 40-1758.
F-27346-4 © 2010 Schneider Electric. All rights reserved. 3
Installation Completion
Finish installing the MNB-Vx controller by performing the wiring and network configuration
tasks outlined in the MicroNet BACnet Wiring and Networking Practices Guide, F-27360.
Information covered in this Guide include:
• Communications wirin g • Logical addressing of devices
– MicroNet BACnet wiring
– Sensor Link (S-Link) wiring
• Input/Output wiri ng • Troubleshooting
• Power sup ply wiring • A list of related documentation
• Mechanical ha rdware checkout
Precautions General
Warning: Electrical shock hazard! Disconnect power before installing or removing the
cover.
• Follow Static Precautions (below) when installing this equipment.
• Use copper conductors that are suitable for 167°F (75°C).
• Make all connections according to electrical wiring diagram, national and local electrical
codes.
Static Precautions
Static charges damage electronic components. The microprocessor and associated circuitry
are extremely sensitive to static discharge. Use the following precautions when installing,
servicing, or operating the system.
• Work in a static-free area.
• Discharge static electricity by touching a known, securely grounded object.
• Use a wrist strap connected to earth ground when handling the controller’s printed
circuit board.
Federal Communications Commission (FCC)
This equipment has been tested and found to comply with the limits for a Class A digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference when the equipment is operated in a
commercial environment. This equipment generates, uses, and can radiate radio frequency
energy, and, if not installed and used in accordance with the instruction manual, may cause
harmful interference to radio communications. Operation of this equipment in a resdential
area is likely to cause harmful interference, in which case the user will be required to correct
the interference at his own expense.
Canadian Department of Communications (DOC)
This Class A digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.
European Community Directives
This equipment meets all requirements of European Community Directives for Low Voltage
(72/23/EEC), General Safety (92/59/EEC), and Electromagnetic Compatibility
(89/336/EEC).
• Configuration of routers
• Communications ha rdware checkout
Distributed, manufactured, and sold by Schneider Electric. I/A SERIES trademarks are owned by
Invensys Systems, Inc. and are used on this product under master license from Invensys. Invensys
does not manufacture this product or provide any product warranty or support. For service, support,
and warranty information, contact Schneider Electric at 1-888-444-1311.
On October 1st, 2009, TAC became the Buildings Business of its parent company Schneider Electric. This document reflects the visual identity of Schneider Electric, however there
remains references to TAC as a corporate brand in the body copy. As each document is updated, the body copy will be changed to reflect appropriate corporate brand changes.
All brand names, trademarks and registered trademarks are the property of their respective owners. Information contained within this document is subject to change without notice.
Schneider Electric
F-27346-4
February 2010 tl
© 2010 Schneider Electric. All rights reserved.
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