Contemporary Controls BASstat Series User manual

BAST-221C/CH-B2
BACnet Communicating Thermostat for Multi-Stage Heating/Cooling/Ventilation
BASstat
Multi-Stage Thermostat
User Manual
# UM-15090000-AA8

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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.
Copyright
© Copyright 2021, by Contemporary Control Systems, Inc. All rights reserved. No part of this 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:
[phone]
2431 Curtiss Street
Fax:
[phone]
Downers Grove, Illinois 60515 USA
E-mail:
[email protected]
Contemporary Controls Ltd
Tel:
[phone]
14 Bow Court
Fax:
[phone]
Fletchworth Gate
E-mail:
[email protected]
Coventry CV5 6SP UK
Contemporary Controls (Suzhou) Co. Ltd Tel: [phone]
19F, Metropolitan Towers
Fax:
[phone]
No.199 Shishan Road
Suzhou New District
E-mail:
[email protected]
Suzhou PR China
215009
Contemporary Controls GmbH
Tel:
[phone]
Fuggerstraße 1 B
Fax:
[phone]
D-04158 Leipzig Deutschland
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.

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Contents
1Introduction..................................................................................................................3
1.1. Features and Benefits .................................................................................................4
1.2. Product Image and Main Features...............................................................................5
2Specifications ..............................................................................................................7
2.1. Inputs...........................................................................................................................7
2.2. Outputs ........................................................................................................................7
2.3. Communication............................................................................................................7
2.4. Electrical ......................................................................................................................7
2.5. Environmental..............................................................................................................8
2.6. Electromagnetic Compatibility......................................................................................8
2.7. Mechanical (all dimensions are in mm)........................................................................9
3Installation .................................................................................................................11
3.1. Terminal Block Pin Assignments ...............................................................................11
3.2. Limited Power Source................................................................................................11
3.3. Power Supply Precautions.........................................................................................12
3.4. Wiring Diagram..........................................................................................................12
4Operation...................................................................................................................13
4.1. User Mode .................................................................................................................13
4.2. Control Type ..............................................................................................................15
4.3. Engineering Mode Menu............................................................................................19
4.4. BACnet Objects and Network Configuration..............................................................25
5Warranty ....................................................................................................................34
6Returning Products for Repair ...................................................................................35
7Declaration of Conformity ..........................................................................................35

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1 Introduction
The BAST-221C-B2 is a member of the BASstat BACnet Communicating Thermostat series. It
provides multi-stage heating and cooling control in an attractive wall-mounted enclosure with a
large LCD display. Intended for use with rooftop units (RTUs), the thermostat can control one or
two stages of heating and two stages of Direct Expansion (DX) cooling. The BASstat is BACnet
compliant and BTL listed to ensure seamless integration into BACnet networks, using
BACnet/MSTP over 2-wire EIA-485. The BAST-221C-B2 can be routed to BACnet/IP clients
using a BASrouter (BASRT-B). A large, 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. “221CH” thermostat models support relative humidity reading with a built-in
sensor which is shown on the display and as a BACnet object, as well as a calculated dew point
value as a BACnet object (no control action is taken based on humidity). Both models have five
relays – two for stage heating, two for stage cooling and one for fan. The BASstat is
configurable locally using the Engineering Menu or via a network connection to a BACnet client.
Contemporary Controls’ free BACnet Discovery Tool (BDT): www.ccontrols.com/sd/bdt.htm can
be used for initial discovery and configuration of the thermostat over the network. 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.
Operating states are indicated 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. All features available are configurable using both methods.

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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 seamless integration into
BACnet networks
•24VAC (+/-10%) power input
•Manual-changeover or Auto-changeover control types
•BACnet MS/TP with baud rate selections up to 76.8kbps
•Suitable for single to multi-stage heat/cool control applications with
manual or automatic changeover between heating and cooling modes
•Adjustable algorithm applied to multi-stage step control
•Adjustable minimum on/off time staging for optimizing runtime
•Effective run time accumulation for system runtime for energy
consumption metering
•Full configurable control parameters such as deadband, proportional
gain, integral rate, stage trip points, and cycle time
•Adjustable minimum/maximum set point ranges
•Three options for temperature reading:
•Built-in temperature sensor, or
•Remote sensor (RS) input for wiring in a remote temperature sensor
(NTC 3kΩ), or
•BACnet network temperature override
•Occupancy status can be switched from thermostat buttons by
occupants or using BACnet network command.
•Separate adjustable occupied set points for heating and cooling mode
•Separate adjustable unoccupied set points for heating and cooling mode
•Fan can be set to run continuously or automatically depending upon fan
mode
•Non-volatile memory retains user settings during power outage
•Thermostat buttons are lockable to prevent tampering
•°C or °F display
•Control outputs disabled during “OFF” state for safety

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1.2. Product Image and Main Features
BASstat 221C-B2

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BASstat 221CH-B2

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2 Specifications
2.1. Inputs
Item
Description
Temperature Display Range
14 to 140°F (-10 to +60°C)
Temperature Display Resolution
0.1°F (0.1°C)
Temperature Accuracy
±1.8°F (±1.0°C) with all outputs off
Setpoint Range
32 to 122°F (0 to 50°C) in 0.5° (°F or °C) increments
Remote Temperature Sensor
Provision for NTC Type 3kΩ thermistor
2.2. Outputs
Item
Description
Relay Outputs
Heating 1, Heating 2, Cooling 1, Cooling 2, Fan
Contact Rating
SPST 2A at 30 VAC with inductive load
Minimum contact life
100,000 cycles
2.3. Communication
Item
Description
Protocol Compliance
BACnet MS/TP with B-ASC, BTL Listed
Physical Layer
2-wire, non-isolated EIA-485, no built-in EOL termination
Baud Rate
9.6, 19.2, 38.4, 76.8 kbps (default 38.4 kbps), N81 format
Cabling
Single-pair twisted 24GA with shield
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

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2.5. Environmental
Item
Description
Operating Temperature
32°F 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-221C 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)
Wiring: 14 to 22 AWG wires or 1.5mm2 wires
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 is intended for surface-mount installation at eye-level 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. Terminal markings for mechanical
equipment follow NEMA DC 3-2003 convention. For single-stage operation, connect Y wire to
Y1 and W wire to W1. BACnet MS/TP data communication connections can be found at
terminals 16 and 17 and are polarity sensitive. The BASstat does not provide End-of-Line
termination. If the BASstat 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. The BASstat is intended to be powered by a Class 2 compliant
power source and only accepts 24VAC.
Number
Mark
Comment
Number
Mark
Comment
1
R
24 VAC high-side
10
2
C
24 VAC common
11
3
Y1
Cooling Stage 1
12
4
13
RS
Remote Sensor Input
5
Y2
Cooling Stage 2
14
GND
Ground
6
W1
Heating Stage 1
15
ESI
Energy Saving Input
7
W2
Heating Stage 2
16
D+
BACnet MS/TP Data +
8
G
Fan
17
D-
BACnet MS/TP Data -
9
18
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 and should be powered by a Class 2
power source complying with the requirements of the National Electric Code (NEC) article 725.
The power rating of a Class 2 power source is limited to 100 VA. 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).

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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
recommended. AC power sources that power several half-wave devices have a common
secondary connection called COMMON, LO, or GROUND. Connect the HOT side of the
secondary to the 24 VAC high side input on the BASstat and the LO side to 24 VAC common.
WARNING: Devices powered from a common AC source could be damaged if a mix of half-
swave and full-wave rectified devices are both present. If you are not sure of the type of rectifier
used by another device, do not share the AC source with it.
3.4. Wiring Diagram
Wiring: 14 to 22 AWG wires or 1.5mm2 wires

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13
4 Operation
4.1. User Mode
User-side control is accomplished with six buttons – MODE (Heat, Cool, or Ventilate), FAN (Auto
or On), UP, DOWN, SET, and POWER. There are also options to lock the panel buttons to limit
user access if so required. A large LCD display indicates setpoint, space temperature,
occupancy status, and current mode of operation using graphical icons.
System modes (Cool, Heat, Ventilate) available to the user are dependent on control type
chosen from Engineering Menu (tyPE) or BACnet object [MSV8] Control Type. See section 4.2
Control Type of this manual). System modes and button operation may be limited by the installer,
especially if the thermostat is completely controlled over BACnet network.
The first tier of operation includes the following settings as shown below. To operate the
thermostat:
1. The POWER button toggles between ON or OFF states to start / stop the
thermostat outputs. This will disable control (ON/OFF control can be accomplished over
BACnet as well).
2. At power ON, press any button to start the User Mode operation. Press the MODE button
to toggle between different HVAC operating modes such as Cool, Heat, or
Ventilate@Cool and Ventilate@Heat.
Press the UP/ DOWN buttons to increase/decrease temperature
setpoint or rotate the values of a setting. Press the FAN button to toggle fan
modes of AUTO or CONTINUOUS. If no AUTO icon is displayed, the fan is in
CONTINUOUS fan mode and it will run continuously until commanded off using button on
thermostat or BACnet command. If AUTO icon is flashing, the fan is operating under
delay timer and will shut off automatically when delay timer expires.
Press the SET button and use UP/ DOWN buttons to
toggle the unit between Occupied or Unoccupied states when outside of scheduled
operation. Use SET or MODE to apply (SET button can be locked in applications
forbidding occupancy state user control).
3. Thermostat will return to normal display with the last known setting if there’s no button
pressed for 10 seconds.

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User Mode Thermostat Operation
#
Item
Description
Remarks
1
Normal Display
Display current room or set-point
temperature
Use the (SP) parameter in
the Engineering Menu or
[MSV6] Display Option for
BW2 or [MSV7] Display
Option for B2 model to
choose Current room or Set-
point temperature on display.
2
Temperature
Setpoint
Setting using
Up/Down
Arrows
Set the desired temperature
The [AV0] / [AV3] Cool / Heat
Occupied and [
AV8] / [AV9]
Unoccupied Cool / Heat
temperature setpoints BACnet
objects can be used to write or
force the setpoint to a desired
value from BACnet supervisor.
3
Mode Select
Select the working mode:
Cooling ( ), Heating ( ), or
Ventilatin
g ( ).
After pressing the MODE
button, press the UP/ DOWN
button to rotate the selections.
Dependent on Control Type.
4
Fan Auto/
Continuo
us
Change the Fan mode between
Auto or Continuous.
When AUTO is displayed, the
fan is handled automatically.
When AUTO is flashing, the
fan is working under a delay
timer. When FAN icon is
spinning but AUTO is not
displayed, the fan will run
continuously until commanded
off.
5
Occupancy
Setting
Press SET, Used UP and DOWN
arrows to toggle between the
Occupied and Unoccupied setting.
Use MODE or SET buttons to apply.
The SET button could be
locked for applications
forbidding user
occupancy
state control.

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User Mode Flow Chart
4.2. Control Type
Control Type, System Mode and Algorithm Configuration
The BAST-221C supports two different control types, selectable in Engineering Menu item (tyPE) or
BACnet object [MSV8].
Control type is only configurable by the installer using Engineering Mode Menu or BACnet
supervisor. The installer must decide the control type suitable for the application, set it to a static
value, or program the BACnet supervisor to change the control type automatically. The default
control type is set to 2- stage Heating and Cooling with Auto Changeover. This is the most common
control type. 2- stage Heating and Cooling with Manual Changeover can be used to limit frequent
automatic change of system modes (Cool or Heat).
Dual Stage Heat and Cool with Auto Changeover - This the default control type in this thermostat.
Mostly used for standalone operation. The thermostat will switch between Cool and Heat modes
automatically. In this control type, the user will be presented with a choice of Heat or
Ventilation@Heat when the thermostat is in Heat mode (automatic), and Cool or Ventilation@Cool
when the thermostat is in Cool mode (automatic).

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Dual Stage Heat and Cool with Manual Changeover – In this control type the thermostat will wait for
a command from user or BACnet supervisor to switch between Cool and Heat modes. The user will
be presented with a choice of Heat or Ventilation@Heat when the thermostat is in Heat mode, and
Cool or Ventilation@Cool when the thermostat is in Cool mode. The user can choose to switch
between Cool and Heat modes using the MODE button.
BACnet controlled – In this control scheme, the built-in thermostat algorithm can be bypassed, and
the thermostat can be controlled over the BACnet network with commands from the supervisor
device. The logic executing in the supervisor (such as Niagara or Sedona logic) can control the
thermostat over the BACnet network. To put the thermostat in BACnet network control mode, use the
Lock [AV18] object bit 9: Control DOs by thermostat algorithm “0” (default) or BACnet supervisor “1”
(add decimal=512).
Cool Only (nullified/disabled in firmware), and Heat Only (nullified/disabled in firmware) control types
are listed in the BACnet object and Engineering Menu object but are not available for use.
Fan Output in Heat Mode
By default, the BASstat thermostat will not provide Fan output signal when in Heat Mode since most
HVAC comfort systems such as RTU systems provide their own fan control signal based on a delay
after a call for heating. This can be configured from Engineering Menu item (F-Ht) or BACnet object
[BV15] Fan Output For Heating. The default value is “0”. To enable fan control signal output for
heating coming from the BASstat, set this value to “1”.
Algorithm
•A PID adaptive control algorithm is applied to minimize overshoot, in addition to proportional
band (Stage Width) and derivative (Differential) calculation.
•When the thermostat is active (either the heating or cooling stage is on), a “Working
( )”
icon will be shown on the LCD.
•Stage 1 operation will show the icon ( ). Stage 2 operation will display ( ).
Assigned Current Temperature
•A current temperature value can be assigned thru BACnet AV-1 to take place of the
onboard temperature sensor value. The assigned value is valid if BACnet communication
is driving a flip-flop signal to (BV-16: heartbeat signal) within the (AV-29: Heartbeat Rate
time) period (in seconds). Otherwise, the assigned temperature will revert back to the
onboard sensor reading.

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System Mode
•The default control type is 2-stage cooling and heating with automatic changeover. This
makes the thermostat operate fully stand-alone. Control Type can be selected in (tyPe) or
[MSV8]. Manual Changeover control type allows restriction of mode selection to Cool only
or Heat only in applications where necessary.
•Occupied Cooling [AV0] and Heating [AV3] set points and Unoccupied Cooling [AV8] and
Heating [AV9] setpoints can be set individually for cooling and heating modes, with either
manual or automatic changeover control. Minimum deadband [AV7] can be programmed
as well.
•For cooling/ heating with manual changeover control, cooling or heating can be selected
by pressing the MODE button or using a BACnet command to object [ MSV1]. In
application where user control needs to be limited, the lock button function can be used to
disable MODE button.
Fan Control Output
•Fan Output for Heating - the fan output for Heat mode is disabled “0” in [BV15] by default.
The thermostat lets the RTU circuity control the fan during Heat mode. Fan output can be
enabled “1” for Heat mode if desired [BV15].
•Lowest Fan Speed is the speed the fan will default to after a control action (Heating or
Cooling). If the lowest fan speed [MSV4] is set as “Stop (1)”, the fan will be automatically
shut off after the control action (Heating or Cooling) and a 2-minute fan-off time delay.
During this delay time, the AUTO icon will be flashing, and the fan will shut off after the 2-
minute time delay expires. If lowest fan speed is set to “Low(2)” the fan will run

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continuously after a control action. This feature is useful for thermostat models with
multiple fan speeds.
•Fan Mode can be toggled between AUTO or CONTINUOUS by using the FAN button on
the thermostat (user) or BACnet object [MSV0] Fan Mode (BACnet supervisor). By
default, this value is set to “Auto(1)”, the AUTO icon is displayed, and the fan will be
controlled automatically. To put the fan in CONTINUOUS mode set to “Low(2)” this will
cause the fan to run continuously (no AUTO icon is displayed). Fan icon spinning when
fan is active. Optionally, the FAN button can be locked to limit user access to this feature
or the BACnet supervisor can be programmed to default the thermostat to certain state at
the end of an occupancy cycle.
Short Cycle and Maximum Cycles per Hour
•There are short cycle and maximum cycles per hour protection for both cooling and heating
modes [AV23 – 26] Cooling Short Cycle Delay, Cooling Maximum Cycles per Hour and
Heating Short Cycle Delay, Heating Maximum Cycles per Hour.
•The short cycle time (in minutes) will determine the minimum on time and minimum off time
of each stagebefore changing its state. The default setting is 3 minutes.
•Maximum cycles per hour will count the number of cycles in an hour. When the cycle count
reaches the maximum cycles in an hour, it won’t allow additional cycles until the next hour.
•When a stage change is pending due to a Short Cycle Delay or a Maximum Cycle count,
the Clock icon ) will appear on the LCD.
•To disable short cycle checking, set the short cycle to 0 minutes. NOTE: Do notuse this
value unless the heating and cooling equipment is equipped with an internal timer.
Damage to equipment may occur.
Floating Deadband
•The Heat and Cool temperature setpoints could be “attached” together. This means that
as one setpoint is adjusted and “hits” against the deadband region, it will “push” the
deadband region and the other setpoint along the temperature setpoint axis to allow for
adjustment while maintaining the configured deadband. If the setpoint is adjusted back the
other way, it will “pull” the deadband region and the other setpoint along the temperature
setpoint axis.
Minimum Cooling Setpoint and Maximum Heating Setpoint
•Minimum Cooling Setpoint will be confined by set point low limit plus dead band and
Minimum cooling setpoint [AV-39] default: 18℃/ 65℉
•Maximum Heating Setpoint will be confined by set point high limit minus dead band and
Maximum heating setpoint [AV-40] default: 25℃/ 77℉

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Occupancy Setting
There are three ways to define thermostat occupancy state. NOTE: Occupancy will be detected by
ESI contact by default.
•Energy Savings Input (ESI) This is a dry contact input meant for communication from a
customer supplied occupancy sensor. (default)
•Occupancy status (occupied/unoccupied) can be set by a BACnet supervisor using
writable object ESI Contact Definition [BV14]. “0” for occupied, and “1” for unoccupied.
E12/AV18 must be set with a value of 64 (disabled) in advance (E12/AV18 is set as 0 by
default)
•User control of occupancy state is allowed from the SET button if E12/ AV18 Lock has the
ESI Contact disabled. Pressing the SET button and UP/DOWN buttons will toggle the
occupancy state. Press SET button to confirm. The SET button can work in conjunction
with BACnet occupancy Command [BV14] on last-write-wins basis. The SET button could
be locked to limit user control (use Lock [AV18] BACnet object or (LOC) engineering
menu item to lock SET button). In this case only the BACnet supervisor can set
occupancy states.
•Occupancy Status [BI0] is a read-only BACnet object indicating current occupancy state -
“0” for occupied, and “1” for unoccupied. (AV18 is set as 0 by default).
•When in unoccupied state, a Moon ( ) icon will be displayed on the LCD and the
thermostat will change the set-point temperatures to the Unoccupied Cool and
Unoccupied Heat setpoints [AV8 – 9]. When the state changes back to occupied, the
thermostat will return to the occupied set-point values for Cooling and Heating
Temperature Setpoint [AV0, AV3] and a sunlight icon ( ) will be displayed to indicate
occupied state on LCD.
4.3. Engineering Mode Menu
Thermostat configuration can be performed using the engineering mode menu described below or
BACnet objects using a BACnet client tool such as Contemporary Controls free BACnet Discovery
Tool (BDT). It is highly suggested that engineering mode be operated by trained installers only
because it is related to system parameters that will affect the control results.
Operation of Engineering Menu
•At power “ON”, press and hold both the UP and DOWN buttons simultaneously for 5
seconds to enter Engineering Mode menu.
•Press the UP or DOWN buttons to rotate through the menu items. The last item loops
back to first item at the end of items in menu. Press the MODE button to enter a submenu
item.
•Press the UP or DOWN button to change the setting in the submenu item or hold to speed
up setting value change. Press the MODE button to confirm the setting and return to
menu item selection. If no button is pressed for 10 seconds, the display will return to the
menu item selection. After another 10 seconds, the display will return back to User mode.
Settings are not changed unless confirmed using the MODE button.