TAC I/NET MR-VAV-XX Series
Application Specific
MicroRegulator™
TAC’s MR-VAV-XX Series Application Specific
MicroRegulatorTM has an extensive range of pre-engineered
VAV control sequences which, combined with a fully
integrated airflow transducer, makes it a low “Total Installed
Cost” solution for most VAV terminal unit control applications
requiring an external actuator. An intelligent I/STATTM
interface for independent local control and an interface to a
TAC I/NETTM Distributed Control System are
standard options.
02
MR-VAV-XX Series
Application Specific MicroRegulator
Features
Operation
Product AT A GLANCE
MR-VAV-XX Features
• Fully Integrated Airflow Transducer(s) and
Controller in a single DIN rail mountable package
• Standalone and Networked Applications
• Extensive VAV Control Sequences:
– Single/Dual Duct
– Three Stage Heating, Multiple Modes
– Series/Parallel Fan
– Local/Remote Occupancy Override
– Local/Remote Central Plant Heat or Morning
Warm-up Control
– Local/Remote Shut Down Override (fire,
failure, etc.)
– Indoor Air Quality Airflow Setpoint Override
– Demand Control Setpoint Override
– Minimum and Maximum Airflow Parameters for
both Heating and Cooling
• Complete “Out-of-the-Box” Installation,
Configuration and Commissioning
– DIP Switch Configuration and Network
Addressing with Local/Remote Override
– Automated Calibration of Airflow and
Temperature Sensors
– Autoconfiguration of Heating Stages
– “Prove It” function for Performance Verification
– Automatic Database Distribution for
Networked Configurations
– Default Parameter Values
– Configuration and Commissioning from I/
STAT, M/STAT or PC
– Auto rescaling of velocity transducer(s) in low
flow application
– Self-Test Diagnostics
The MR-VAV-XX is the complimentary VAV
controller to the MR-VAV-AX except it has no
integral damper actuator. It has been designed for
applications requiring connection to a box-supplied
damper actuator. This controller has also been
designed to minimize the total installation, setup,
configuration and commissioning costs typically
associated with VAV controllers.
Installation costs have been reduced by totally
integrating the airflow transducer(s) and controller
into a single, plenum rated package that can be
mounted on a DIN rail.
Setup costs have been reduced by the provision of
DIP switches that can be set during installation and
before power is applied. Default parameters will
allow the controller to run immediately from startup
based on these switch settings.
The MR-VAV-XX is also supplied with an
extensive range of pre-engineered and tested
control sequences and therefore, no application
programming is required.
All configuration parameters are pre-installed with
the most typical default values. However, they
can be overwritten either by a connected I/STAT,
an M/STAT (a portable I/STAT) or the Operator
Station PC. Heating stage setpoints, proportional
bands and delays are automatically calculated
and set in the controller based on the controller
setup selection.
Commissioning costs have been reduced
by the use of several automated processes.
Airflow conversion parameters are automatically
calculated once the box duct diameter and the
manufacturer’s K-factor are entered. By measuring
and entering the low and high airflow values for the
box, automatic calibration of the installed airflow
transducer is then performed.
Automated calibration of the temperature sensor
is also initiated once a measured value is entered
into the controller. A “Prove It” function allows a
Schneider Electric One High Street, North Andover, MA 01845 USA
SDS-INET-VAV-X1-X2-A4.BU.N.EN.5.2006.0.00.CC
Telephone: +1 978 975 9600
Fax: +1 978 975 9674
www.schneider-electric.com/buildings
03
MR-VAV-XX Series
Application Specific MicroRegulator
Features
connected Application Specific MicroRegulators.
This database can also include a unique eightcharacter name for each controller as part of each
point descriptor.
Product AT A GLANCE
(continued)
• I/STAT and M/STAT Support Standard
– Local Display – 3 Digit & Decimal
In a standalone configuration, the controller
provides auxiliary inputs for VAV Shutdown (e.g.
fire alarm), Occupancy Override (e.g. Timer, Pushbutton or Occupancy Sensor), and Central Plant
Heat or Morning Warm-Up Override (e.g. contacts
from a central plant).
– Local Point Control – Analog or Digital
– Local Override & Setpoint Adjustment
– Service Mode for Commissioning and
Calibration
– User-Defined Passwords
• Slide/STAT Support Standard
– Slide Setpoint Override
– Occupancy Override
– Integral Port for M/STAT Connection
• Inputs
– Airflow Transducer (one or two)
– Thermistor or Discrete (four)
• Low Voltage Triac Outputs for
– Primary and Secondary Damper Actuators
– Series/Parallel Fan Control
– First Stage Heater Control
(Two Position, Frequency Modulated, Pulse
Width Modulated or Floating Control Modes)
– Second Stage Heater Control
(Two Position Control only)
– Third Stage Heater Control
(Two Position Control only)
complete verification of the control sequence from
an I/STAT or M/STAT. Once initiated, the space
temperature is placed in Test Mode and can be
“increased” or “decreased” by the buttons on the I/
STAT. As the temperature value is changed through
the control range, the I/STAT displays the airflow
value and the state of the fan and auxiliary heating.
This allows confirmation of the thermodynamic
process from end to end. Finally, in a networked
environment, the database for the MicroController
Interface or an I/SITE LAN can be automatically
generated by an upload of all the data in the
In a network environment, these signals can be
provided locally for the standalone mode or via
the network. If these inputs are not used for local
override signals, then they can be designated as
“free” and used for any auxiliary input condition
monitoring desired in a networked environment
(e.g. supply air temperature). This is also applicable
to any unused outputs. They can become available
for control applications resident in the MCI or I/
SITE LAN (e.g. lighting control).
A networked environment of MR-VAV-XX
controllers can provide an extensive range of global
interlocks. These include Demand Mode setpoint
override, Central Plant Heat/Morning Warm-up,
Smoke Control (purge and isolate), Indoor Air
Quality (IAQ) Minimum Airflow setpoint override,
Temperature Setpoint override and Occupancy
override.
Also, the current damper actuator position is
continuously calculated and available as an Analog
Output value that is a percentage of full damper
stroke. This eliminates the need for expensive
feedback potentiometers and analog voltage
controlled (0-10Vdc) damper actuators. Also,
this analog output point can be overridden either
manually from an operator station or automatically
via an application program in the MCI or I/SITE LAN
and the actuator driven to any desired absolute
position.
The controller can also provide an analog value of
the current controller loading as a percentage value
of full load, for both cooling and heating modes.
This value can be used in the networked system
to provide an accurate signal to the central plant
controllers of actual system load requirements.
Schneider Electric One High Street, North Andover, MA 01845 USA
SDS-INET-VAV-X1-X2-A4.BU.N.EN.5.2006.0.00.CC
Telephone: +1 978 975 9600
Fax: +1 978 975 9674
www.schneider-electric.com/buildings
04
MR-VAV-XX Series
Application Specific MicroRegulator
Features
Model
Number Description
Comments
7716
Process Control Unit,
8 UI, 8 DO (Relay),
24Vac
Baseplate
Mounted,
accommodates
the RS-232
Communications
Expansion Board,
and/or one of the
Point I/O modules
listed below.
MR-VAV-X1
Application Specific
MicroRegulator,
1 I/STAT Port, 1
Integrated Airflow
Transducer, 4
Thermistor or
Discrete Inputs, 6
Low Voltage Triac
Outputs, 24Vac
External Actuator
required
MR-VAV-X2
Application Specific
MicroRegulator,
1 I/STAT Port, 2
Integrated Airflow
Transducers, 4
Thermistor or
Discrete Inputs, 6
Low Voltage Triac
Outputs, 24Vac
External Actuator
required
TCON155
Application Specific
MicroRegulator
Installation Guide
MR-VAV-X1
TCON156
Application Specific
MicroRegulator
Installation Sheet
MR-VAV-X2
TCON149
Application Specific
MicroRegulator
Pocket Guide
MR-VAV
TCON164
MR-VAV-X2
Installation/
Reference Guide
TCON165
MR-VAV-X2
Installation Sheet
TCON166
MR-VAV-X2 Pocket
Guide
Schneider Electric One High Street, North Andover, MA 01845 USA
SDS-INET-VAV-X1-X2-A4.BU.N.EN.5.2006.0.00.CC
MR-VAV-XX
Connections
Telephone: +1 978 975 9600
Fax: +1 978 975 9674
www.schneider-electric.com/buildings
05
MR-VAV-XX Series
Application Specific MicroRegulator
Specifications
COMMUNICATION PORTS
SOFTWARE
VELOCITY PRESSURE INPUT:
MICROREGULATOR LAN:
POINT CAPACITY:
Operating Range: 0.0 to 1.00 in. of W.C.
RS-485, 9600 baud, asynchronous, polling
20 resident points. Hardware (external)
(0.0 to 250Pa)
NETWORK WIRING REQUIREMENTS
points are a function of model selected,
Sensitivity: 0.0029˝ W.C. (0.73Pa) below
MR LAN LENGTH:
and software (internal or indirect) points
midscale and 0.0049˝ W.C. (1.10Pa) above
5000 ft (1500 m)
activated. Indirect points are non-local
midscale.
CABLE SUPPORTED
reflections of any “global” point in the TAC I/
Tubing Connections: Barb fittings for
Twisted pair, shielded. 24 AWG or larger, 30
NET system.
0.170˝ (4.3 mm) I.D. FRPE polyethyl-
pF/ft or less between conductors, 55 pF/ft
INPUT/OUTPUT
ene tubing or 0.25˝ O.D./0.125˝ I.D. (6.3
or less conductor to shield, 85 to 150 Ohm
SPACE SENSOR INPUT:
mm/3.2 mm) tygon tubing.
impedance. Belden 9841 or equivalent.
Supports I/STAT, Slide/STAT or
Tubing Length: 4 ft (1.2 m) maximum each
PROCESSOR
10K Ohm NTC Thermistor
tube.
PROCESSOR:
(Dale 1M1002-C3)
TERMINATIONS
Zilog 86193
Accuracy: 1°F (0.60°C)
TERMINAL BLOCKS:
MEMORY
Resolution: 0.32°F (0.18°C) @ 77°F (25°C)
Removable screw termina connectors
EPROM:
INPUTS:
INDICATION
32KBytes
May be either thermistor or discrete contacts
LEDs:
RAM:
per the following specifications.
MR LAN activity (transmitting & receiving –
464Bytes
ANALOG INPUTS:
each channel), test mode (microprocessor
NOVRAM:
10K Ohm NTC Thermistor
check, EPROM check, NOVRAM check)
4096Bytes.
(Dale 1M1002-C3)
DIP SWITCH
PHYSICAL DECRIPTION
Accuracy: 1%
SW1 – 5:
BASEPLATE AND COVER DIMENSIONS:
Resolution: 0.4% Span
Address (0 to 31)
8.0˝ L x 4.3˝ W x 2.4˝ H
A/D Digital Filtering: Median value filter and
SW6 – 12:
(196 mm x 105 mm x 61 mm).
60 Hz notch filter
Function Selection
DIN RAIL MOUNTING ON BASE ENCLO-
Calibration Coefficients: Factory set in
AGENCY APPROVALS
SURE:
NOVRAM, field adjustable,
FCC Part 15
PC/ABS plastic rated UL94-VO
7 individual pairs.
UL916 Energy Management Equipment
POWER REQUIREMENTS:
DIGITAL INPUTS:
UL94-V0 Plenum Rated Enclosure
24Vac, +10%, 50/60 Hz
Dry contact input
MICROREGULATOR INTERFACE
(8VA, plus triac load, 4 amp fused)
Contact Excitation: 5V @ 0.5 mA
(MRI)
OPERATING TEMPERATURE:
DISCRETE OUTPUTS:
AVAILABLE PLATFORMS:
32°F to 122°F (0°C to 50°C)
Low Voltage Triac: 24Vac @ 0.5A max
7792 MRI
OPERATING HUMIDITY:
(voltage sourcing), fused.
7793 MCI
10 – 90% RH, non-condensing
POINT SCAN INTERVAL:
7798 I/SITE LAN
1 – 255 seconds
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 One High Street, North Andover, MA 01845 USA
SDS-INET-VAV-X1-X2-A4.BU.N.EN.5.2006.0.00.CC
Telephone: +1 978 975 9600
Fax: +1 978 975 9674
www.schneider-electric.com/buildings
May 2006
gg
© 2006-2009 Schneider Electric. All rights reserved.
Process Control Unit