Contemporary Controls BASstat BAST-421C-B2 User manual

BAST-421C-B2

BACnet Communicating Thermostat for Modulating Fan Coil Operation

BASstat

Modulating Thermostat

User Manual

#UM-15093000-AA1

UM-15093000-AA1

Page 1

Trademarks

BASautomation, Contemporary Controls, and CTRLink are registered trademarks of

Contemporary Control Systems, Inc. BACnet is a registered trademark of the American Society

of Heating, Refrigerating and Air-Conditioning Engineers, Inc. Powered by Sedona Framework

is a trademark of Tridium, Inc. Other product names may be trademarks or registered

trademarks of their respective companies.

publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or

translated into any language or computer language, in any form or by any means, electronic,

mechanical, magnetic, optical, chemical, manual, or otherwise, without the prior written

permission of:

Contemporary Control Systems, Inc.

Tel:

+1-630-963-7070

2431 Curtiss Street

Fax:

+1-630-963-0109

Downers Grove, Illinois 60515 USA

E-mail:

[email protected]

Disclaimer

Contemporary Control Systems, Inc. reserves the right to make changes in the specifications of

the product described within this manual at any time without notice and without obligation of

Contemporary Control Systems, Inc. to notify any person of such revision or change.

UM-15093000-AA1

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Contents

1Introduction ................................................................................................................. 3

1.1 Features and Benefits ........................................................................................... 4

1.2 Product Image and Main Features ........................................................................ 5

2Specifications.............................................................................................................. 6

2.1

Inputs .................................................................................................................... 6

2.2

Outputs ................................................................................................................. 6

2.3

Communication ..................................................................................................... 6

2.4

Electrical ............................................................................................................... 6

2.5

Environmental ....................................................................................................... 7

2.6

Electromagnetic Compatibility ............................................................................... 7

2.7

Mechanical (all dimensions are in mm) ................................................................. 8

3Installation................................................................................................................... 9

3.1

Terminal Block Pin Assignments........................................................................... 9

3.2

Limited Power Source ........................................................................................... 9

3.3

Power Supply Precautions .................................................................................... 9

3.4

Wiring Diagram ................................................................................................... 10

4Operation .................................................................................................................. 11

4.1

User Mode .......................................................................................................... 11

4.2

Control Type ....................................................................................................... 13

4.3

Engineering Mode Menu ..................................................................................... 16

4.4

BACnet Objects and Network Configuration ....................................................... 21

5Warranty ................................................................................................................... 30

6Returning Products for Repair................................................................................... 30

7Declaration of Conformity.......................................................................................... 30

UM-15093000-AA1

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1 Introduction

The BAST-421C-B2 is a member of the BASstat BACnet Communicating Thermostat series. It

provides modulated heating and cooling control in an attractive wall-mounted enclosure with a

large LCD display. Intended for use with 4-pipe heated/chilled water Fan Coil units, the

thermostat can control 2 analog modulating water valve actuators and one binary supply fan.

This BASstat is BACnet compliant and BTL listed to ensure seamless integration into a BACnet

network, using BACnet/MSTP over 2-wire RS-485, and can be routed to BACnet/IP clients using

a Contemporary Controls BASrouter (BASRT-B). A large and easy to read LCD display indicates

setpoint, space temperature and current mode of operation using graphical icons.

The BASstat has a built-in space temperature sensor with provision for remote wired 3kΩ NTC

thermistor sensor or temperature value can be sent by another communicating device over the

BACnet network. The BASstat is configurable locally using the Engineering Menu or via a

network connection to a BACnet client. Contemporary Controls’ free BACnet Discovery Tool can

be used for initial discovery and configuration of the thermostat over BACnet. Control algorithm

parameters such as deadband, proportional gain, integral rate and trip points are all

configurable. This BASstat also features configurable fan control and occupancy selection. All

states are indicated by graphical icons on the thermostat display.

The numerous features available in the BASstat can be configured by the systems integrator to

meet user requirements in two different ways. One way is using a button sequence on the

thermostat in order to enter the Engineering Menu - which requires physical access to the

thermostat. Optionally, the buttons could be locked to limit user access to Engineering Menu after

installation is complete. The second method is configuring the thermostat over the BACnet

network using a BACnet client device or software such as Contemporary Controls’ free BACnet

Discovery Tool (BDT). All features available are configurable using both methods.

NOTE: 2-pipe heat/cool applications and floating-type valve actuators are not supported by this

device.

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1.1 Features and Benefits

•

Stand-alone thermostat algorithm or fully BACnet network-controllable

•

BTL listed with B-ASC device profile for integration into BACnet networks

•

24VAC (+/-10%) power input

•

BACnet MS/TP with baud rate selections up to 76.8kbps

•

Suitable for 4-pipe modulating heat/cool control applications with manual or automatic

changeover NOTE: 2-pipe heat/cool applications and floating-type valve actuators are

not supported by this device

•

Adjustable algorithm applied to modulating valve control

•

Effective run time accumulation for energy consumption metering

•

Full configurable control parameters such as deadband, proportional gain, integral rate

and cycle time

•

Adjustable minimum/maximum set point ranges

•

Three options for temperature reading:

oBuilt-in temperature sensor, or

oRemote sensor (RS) input for wiring in a remote temperature sensor (NTC 3kΩ), or

oBACnet network temperature override

•

Occupancy status can be switched (1) locally by the user, (2) by using a separate

occupancy sensor, or (3) by using BACnet network command.

•

Separate adjustable occupied and unoccupied set points for heating and cooling mode

•

Fan can be set to run continuously or automatically

•

Non-volatile memory retains user settings during power outage

•

Thermostat buttons are lockable to prevent tampering

•

°C or °F display

•

Energy Savings Input (ESI) for local occupancy control

•

Control outputs disabled during “OFF” state for safety

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1.2 Product Image and Main Features

BASstat 421C-B2 and BASstat 421C-BW2

UM-15093000-AA1

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2 Specifications

2.1

Inputs

Item

Description

Temperature Display Range

-22 to 248 °F (-30 to 120.0°C) with suitable sensor

Temperature Display Resolution

0.1°F (0.1°C)

Temperature Accuracy

±1.8°F (±1.0°C) with all outputs off

Energy Savings Input

Provision for external occupancy sensor

Setpoint Range

32-122°F (0-50°C) in 0.5° (°F or °C) increments

Remote Temperature Sensor

Provision for NTC Type 3kΩ thermistor

2.2

Outputs

Item

Description

Relay Output

Fan

Analog Outputs

0-10v modulating AO1 (cooling), AO2 (heating)

Contact Rating

SPST 2A at 30 VAC with inductive load

Minimum contact life

100,000 cycles

2.3

Communication

Item

Description

Protocol Compliance

BACnet/MSTP with B-ASC, BTL Listed

Physical Layer

RS-485 2-wire

Baud Rate

9.6, 19.2, 38.4, 76.8 kbps (default 38.4kbps) N81 format

Cabling

Shielded single-pair twisted 24 GA AWG

2.4

Electrical

Item

Description

Supply Voltage and Current

24 VAC (±10%) 5 VA

Power Source Class

NFPA 70 (NEC) Article 725 Part III Class 2

Internal Power Supply

Half-wave rectified and filtered DC

UM-15093000-AA1

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2.5

Environmental

Item

Description

Operating Temperature

32 to 122°F (0 to 50°C)

Storage Temperature

14 to 140°F (-10 to +60°C)

Relative Humidity

5 to 95% non-condensing

2.6

Electromagnetic Compatibility

The BAST-421C-B2 complies with the following specifications and bears the CE

mark in accordance with the provisions of the Electromagnetic Compatibility (EMC)

Directive 2004/108/EC based on the following specifications:

Standard

Test Method

Description

EN 61000-6-2

IEC 61000-4-2

Electrostatic Discharge Immunity

EN 61000-6-2

IEC 61000-4-3

Radiated, Radio-Frequency,

Electromagnetic Field Immunity

EN 61000-6-2

IEC 61000-4-4

Electrical Fast Transit/Burst Immunity

EN 61000-6-2

IEC 61000-4-5

Voltage Surge Immunity

EN 61000-6-2

IEC 61000-4-6

Immunity to Conducted Disturbances

EN 61000-6-2

IEC 61000-4-8

Power Frequency Magnetic Field

Immunity

EN 61000-6-2

IEC 61000-4-11

Voltage Dips and Interruptions

EN 61000-6-3

IEC 61000-3-2

Limits for Harmonic Current Emissions

EN 61000-6-3

IEC 61000-3-3

Limitation of Voltage Fluctuations and

Flicker in Low Voltage Supply Systems

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2.7

Mechanical (all dimensions are in mm)

Mounts directly onto wall, panel, standard 65×65mm junction box (hole pitch 60 mm) or

standard 2×4-inch vertical junction box (hole pitch 83.5mm).

Width: 94mm

Height: 118mm

Depth: 34mm

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3 Installation

The BASstat 421C-B2 is intended for surface-mount installation on an interior wall, away from

direct sunlight or direct air movement. The display (top half) can be removed from its base by

loosening the small Philips screw at the bottom of the display. Once the display is removed

from the base, the base can be mounted onto the wall with appropriate fasteners. If a single-

gang electrical junction box is to be used, the top and bottom mounting holes will align with the

screw holes in the junction box.

3.1

Terminal Block Pin Assignments

Two terminal blocks provide for all field connections. BACnet MS/TP data communication

connections can be found at terminals 16 and 17 and are polarity sensitive. This BASstat does

not provide End-of-Line termination. If the BASstat-421C-B2 is the first or last device on the

MS/TP bus, a termination resistor (120Ω) must be applied across pins 16 and 17 of the input

terminal. The remote sensor input (RS) is at terminals 13 and 14. The remote occupancy (ESI)

input is a dry contact closure input located at terminals 14 and 15.

Number

Mark

Comment

Number

Mark

Comment

24 VAC high-side

AO1

Cooling Device

24 VAC common

COM

AO2

Heating Device

Remote Sensor Input

COM

Sensor Common

ESI

Energy Saving Input

D+

RS-485 Positive

Fan

D-

RS-485 Negative

3.2

Limited Power Source

The BASstat is intended to be powered by a Class 2 compliant power source and only accepts

24VAC with no more than 5VA of power consumption. It should be powered by a Class 2 power

source complying with the requirements of the National Electric Code (NEC) article 725. The

transformer or power supply complying with the Class 2 rating must carry a corresponding listing

from a regulatory agency such as Underwriters Laboratories (UL).

3.3

Power Supply Precautions

Internally, the BASstat utilizes a half-wave rectifier and can share the same AC power source

with other half-wave rectified devices. Sharing AC power with full-wave rectified devices is NOT

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