Residential Control Systems TR16 User manual

Model TR16
Communicating Thermostat
Rev D ControlUnit
INSTALLATIONANDOPERATIONMANUAL
DCN: 141-00930
Rev 07
9/06/04
Product Part No
TR16-485 Thermostat 001-00930-17
TS16 Wall Display Unit 001-00910-07
HCUR-485 HVAC Control Unit 001-00369-08
*** IMPORTANT NOTICE ***
DO NOT USE THIS PRODUCT FOR BUILDING FREEZE PROTECTION! YOU ARE ADVISED TO INSTALL
A MECHANICAL FREEZE PROTECTION DEVICE FOR THIS PURPOSE.
RCS ResidentialControlSystemsInc.

DCN: 141-00930-07 09/06/04 2
TR16Operation
The TR16 thermostat provides the latest technology in a full-featured universal thermostat with serial
communications. The TR16 has many new features including:
•Separate Heating and Cooling setpoints
•Multistage HVAC systems support
•Wall Display Unit setting of
oNetwork Address
oF/C temperature display mode
oSensor calibration (internal and remotes)
•Automatic Remote Sensor detection
•AutoSend Mode for network communications
•Adjustable operating parameters from the network
•Enhanced serial protocol
The TR16 thermostat consists of two parts, a Wall Display Unit (WDU) and a HVAC Control Unit. The
Wall Display Unit provides users functions like a traditional thermostat and connects to the Control Unit by a
4 wire cable. The Control Unit connects at the HVAC system using the standard thermostat connections
and provides the thermostatic temperature control of the system. The Control Unit also has the serial
RS485 communications network connection.
The TR16 now maintains separate heating and cooling setpoints. The display shows the setpoint of the
current operating mode (in Auto mode, the system keeps track of the current operating mode of the last call,
either heating or cooling). New network commands have been added for a heating setpoint (SPH) and a
cooling setpoint (SPC). Note that the TR16 maintains compatibility with single setpoint protocols by
continuing to support the current SP command for both commands and status reports.
In addition to the universal Standard or Heat Pump HVAC systems support, the TR16 has multistage
heating/cooling system outputs. The control unit can support 2 stages of heating and cooling for Standard
systems. It supports 3 stages of heating and 2 stages of cooling for Heat Pump systems.
The TR16 has a convenient setup mode from the Wall Display Unit. You can set the network address, F or C
display mode and easily calibrate the internal and all attached remote sensors.
The TR16 has automatic detection and setup of remote temperature sensors. Remote sensors have address
settings that, when detected by the TR16, will be used for specific functions, such as, in lieu of the internal
sensor, averaging with other sensors or an outdoor temperature sensor.
The TR16 can be used in a polled network such as the RCS CommStar network or can be set to AutoSend
mode that will transmit changes in thermostat data as it occurs.
Most operating parameters (variables), such as staging deltas, delays and run times are now viewable and
adjustable from the network.
Remote control of the TR16 via the serial communications network allows for the thermostat’s temperature,
heating and cooling setpoints, operating mode and fan functions to be monitored or changed. A robust serial
protocol allows full control of all the thermostat setup and operating parameters. Many new serial commands
have been added to support the new features and to allow the operating parameters to be viewed or changed.

DCN: 141-00930-07 09/06/04 3
TS16 WallDisplayUnit
The TS16 Wall Display Unit has a LCD display and control buttons for changing the setpoint, system
operating mode and manual fan mode. The WDU also has an internal temperature sensor. The display
serves as a common display for many functions. It normally shows the current room temperature but
switches to show setpoint, mode or other functions when buttons are pushed. Two on-screen indicators
show the state of the manual fan and setback mode.
Any changes, such as the temperature or control button operations at the WDU are sent to the HVAC
Control Unit. In turn, the Control unit sends changes in setpoint or modes from the serial communications
network to the WDU. When updates are received by the WDU, they are displayed on the LCD display for 3
seconds and then the display returns to the current room temperature.
LCD Display
The LCD display is a two digit multifunction display that normally shows the current room temperature. It has
a continuous backlight for easy viewing anytime. Whenever any of the control buttons are pushed, the LCD
display will change to show that function’s current status. The LCD display will stay in the new display mode
as long as buttons are being pushed. After 3 seconds of no activity, the display will change back to show
current temperature.
The right decimal point on the LCD display will turn on whenever manual fan is ON. The left decimal point will
flash whenever the setback mode is ON.
Remote changes in setpoint or modes that are received by the WDU from the Control Unit will cause the LCD
display to switch and display the updated data for 3 seconds and then return to room temperature.
Temperature Display
The WDU will normally display the room temperature from the internal digital temperature sensor or a remote
sensor if attached.
The WDU will display temperatures from -9°F/C to 127°F/C. Temperatures less than 0°will be displayed
down to -9 °as negative numbers. Temperatures below –9 will also be displayed but no minus sign can be
displayed. Temps over 100°will be displayed without the leading 1 (ex: 102 will be displayed as 02°.)
Outside Temperature Display
.7.5
MODE
FAN
Manual Fan On Indicator
LCD DISPLAY
Shows current temp normally.
Shows setpoint or mode
when buttons pushed.
Setback Mode On Indicator
TS16 WDU
Setpoint Increase Button
Setpoint Decrease Button
SystemMode Button
Manual Fan Button

DCN: 141-00930-07 09/06/04 4
If you attached a remote temperature sensor to the WDU that is set to remote sensor address “4”, you can
view this outside temperature by pressing the UP and DOWN buttons simultaneously. Outside
temperature data may also be sent to the WDU via network commands and viewed this way. Note if you
press the UP/DOWN buttons and no temperature information is available, the display will show “--“.
Control Buttons
The UP and DOWN buttons control the heating or cooling setpoint temperature.
TO VIEW THE CURRENT SETPOINT: Push either the UP or DOWN buttons once will cause the LCD
display to change to show the current setpoint temperature (but won’t change it).
TO CHANGE THE SETPOINT: With the setpoint displayed as above, push the UP button to increase the
setpoint temperature by one degree or push the DOWN button to decrease the setpoint by one degree.
Pushing and holding a button down will cause the setpoint to continuously ramp up/down until the button is
released. After 3 seconds of no activity, the LCD display will change back to show the current room
temperature and the new setpoint value will be sent to the Control Unit.
Setpoint Display
The displayed setpoint shows the setpoint of the current operating mode (heating or cooling) of the
system. If you change modes, the setpoint displayed will change to the new operating mode setpoint.
If you set the mode to AUTO mode, the setpoint displayed will be the current operating mode of the system,
either heating or cooling. This will change if the operating mode changes automatically.
MODE
The MODE button sets the HVAC system Heating or Cooling mode.
TO VIEW THE CURRENT MODE: Push the MODE button once and the LCD display will change to show
the current mode.
TO CHANGE THE MODE: While the mode is being displayed, pushing the MODE button again will go to the
next mode. The system mode cycles from Off to Heatto Cool to Auto and back to Off again with each
push of the MODE button. Once you stop pushing the button (for 3 seconds) the new mode will take affect
and the display will change back to room temperature.
When Heat Pump HVAC system type is selected on the Control Unit dipswitch, an additional system mode
of “EH”, or Emergency Heat, is included in the TS16 mode selections. EH is used when Heat Pump
compressor failure requires the use of Auxiliary Heat (heat strips) for primary heating. When EH mode is
selected, the display will alternate between current temperature and “EH” to remind you that the EH mode
has been selected.
FAN
The FAN button controls the HVAC system’s manual fan mode. Pushing the FAN button once will turn the
fan ON and pushing it again will turn the fan to the AUTO mode (which is OFF unless the fan is automatically
turned ON by the heating or cooling operation ). The decimal point in the middle of the two digits on the LCD
Setpoint UP and DOWN Buttons
MODE Button
FAN Button

DCN: 141-00930-07 09/06/04 5
display will come on when the manual fan is ON. Changes in the fan mode will be sent to the HVAC Control
Unit.
Setup Mode
The TR16 has a new setup mode to allow the user to set the following functions from the WDU:
•Serial Network Address
•F/C mode
•Sensor Calibration
Entering into the setup mode.
Enter the setup mode by the following procedure:
1. First press and hold the Mode button
2. Simultaneously press the Fan button.
3. The display will change to show “SU”.
4. Release all buttons.
5. The display will change to show the setup menu, starting with “Ad” (address)
6. Select what setup function you want to change or view by pressing the Mode button to cycle
through the menu options:
“Ad” Serial Network address
“FC” Fahrenheit or Celsius mode
“C1” Calibrate Internal Sensor (or Remote Sensor address 1 if attached)
and if additional external sensors are attached they will appear also:
“C2” (if Remote Sensor address 2 attached)
“C4” (if Remote Sensor address 4 attached)
Setting the Address
When you first enter the setup mode, the first menu selection displayed on the LCD display is “Ad”. To view
the current address setting, press the UP or DOWN button once. With the current address displayed, you
can either change the setting or exit by pressing the mode button or wait for the screen to time out. If you
want to change the address, while the current address is being displayed, use the UP/Down buttons to
select the serial address desired, 1 to 99. (default set to 1)
Setting the Fahrenheit or Celsius mode
In the setup mode, press the mode button to select “FC” mode. Press the UP/DOWN buttons to select F or
C mode desired. To exit press mode again to move another setup mode or wait for the screen to time out and
return to thermostat mode.
Setting the Sensor Calibration
In the setup mode, press the mode button to display the sensor calibration address, “C1”, to be calibrated.
”C1” is the internal sensor and normally that is all that will be available to calibrate unless external remote
sensors are attached. These will show up as “C2”, and “C4” in the menu selection, if present. With the
desired sensor address displayed, press the UP/DOWN buttons to change the sensor calibration to the
desired temperature. See calibration explanation below.
Exit setup mode
When you are done making changes and no button is pressed for 3 seconds, the display will automatically
exit setup mode and return to the thermostat mode and current temperature display.
Temperature Display Calibration

DCN: 141-00930-07 09/06/04 6
The TS16 WDU has the capability for the user to adjust the temperature display calibration of the internal
sensor as well as all attached remote sensors from the WDU in the setup mode.
Normally the TS16, with no attached remote sensors, will only show the internal sensor as “C1” in the
calibration setup menu. The TS16 can have additional remote sensors attached. These are addressed as
remote sensors 1 to 4. If they are detected by the TS16, they will show up in the calibration menu as
additional sensors to calibrate as C2, C3 and C4. Note that if remote sensor with address 1 is attached it
replaces the internal sensor and is becomes the “C1” sensor. See the remote sensor section for more
details.
When the desired sensor is selected in the setup menu, you can adjust its displayed temperature calibration
up or down 7 degrees by pressing the UP/DOWN buttons.
The calibration menu selections are:
C1 = calibrate internal sensor or remote sensor address 1 if attached
C2 = calibrate remote sensor address 2 (only shows up in menu if attached)
C4 = calibrate remote sensor address 4 (only shows up in menu if attached)
Remote Sensors
The TS16 Wall Display Unit has a remote sensor terminal block, J2, on the base for connection of a remote
temperature sensor. Remote sensors have an address that can be set to 1, 2, or 4. Without any remote
sensor attached, the WDU uses the internal sensor for the current temperature information. When a remote
sensor is attached, the WDU will detect it automatically and will use the remote sensor(s) according to its
address selection. Modes of operation are as follows:
Address 1: Use this remote sensor instead of the internal sensor. (becomes C1 in the calibration setup).
Address 2: Average remote sensor 2 with internal sensor or sensor address 1 if attached. (C2)
Address 3: Not used on TS16 wall display units
Address 4: This remote sensor address is only for an outside temperature sensor. (C4)
Table of Remote Sensor Functions and Sensor Addresses
Function Remote Addr 1 Remote Addr 2 Remote Addr 3 Remote Adrr 4
Use internal sensor only No Yes Not used *
Used as remote sensor only Yes No Not used *
Average internal and one remoteNo Yes Not used *
Average two remotes (only 2) Optional with A2 Yes with A1 Not used *
Outside temp display on WDU NA NA NA Yes
* optional outside temp sensor can be used with any other sensor address.
When averaging sensors are used, the average temperature is displayed on the WDU and reported to the
HVAC control unit. You cannot view an individual remote averaging sensor temperatures as the main
thermostat display or report individual sensor temperatures on the communication port. However, you can
check the individual sensor temperatures by going to the calibration setup menu and selecting the sensor
address. You can view the outside temperature by pressing both the UP/DOWN buttons simultaneously.
Display Lock
The TR16 WDU control buttons can be locked to prevent unauthorized changes in system operation from
the WDU. The display lock/unlock state can only be set by the “DL” network command. See the Serial
Protocol Manual.

DCN: 141-00930-07 09/06/04 7
“CF” or “SF” Error Displays
If the WDU is not properly wired or if communications to the Control Unit is interrupted, the LCD display will
display “CF” to denote Communication Failure. Momentary display of “CF” caused by bad or lost data, will
clear automatically when data communication is restored.
If the “CF” continues to be displayed, check wiring for problems. A continuous “CF” display may indicate a
problem with the Control Unit or the WDU itself.
An “SF” display indicates a temperature sensor failure. If this is displayed continuously, the sensor is failing
to respond and must be replaced. This can also be displayed when attempting to view the outside
temperature if this sensor has failed or been disconnected.

DCN: 141-00930-07 09/06/04 8
TR16HVACControlUnit
The TR16 HVAC Control Unit works in conjunction with the Wall Display Unit to provide thermostatic control
of the HVAC system. In addition, the Control Unit can receive serial RS485 commands for remote control of
the heating/cooling setpoints and mode of the thermostat. The TR16 can also report various status
information via the serial communications network.
The TR16 Control Unit connects to the HVAC system the same as, and in place of, a standard thermostat. It
is usually mounted near the HVAC system, although it can be mounted anywhere convenient. It is
connected to the WDU by a 4 wire cable, either standard thermostat wiring or typically Cat 3/5 in new
construction.
Actual thermostatic control of the HVAC system is provided by the Control Unit. Changes in the current
temperature, setpoint, system or fan modes are sent to the Control Unit either from the WDU or via serial
commands. The Control Unit monitors this information and operates the HVAC system accordingly.
HVAC System Compatibility
The TR16 works with almost all heating and cooling systems, including standard Gas/Electric, Heat Pump,
Radiant, or Hydronic systems and with single or multi-stage systems. Compatible with single or separate
transformer heating/cooling systems (Note: one stage heat only for split heat/cool transformers).
System Type Heating Stages Cooling Stages Notes
Gas 22Single or split transformer
Electric 22Selectable Fan with Heat
Heat Pump 32Selectable Changeover with Heat or Cool
STANDARD GAS/ELECTRIC HVAC SYSTEMS OPERATION
The TR16 has typical HVAC system operating modes of Heating, Cooling and Auto changeover.
In additional to the multiple stages, the TR16 has adjustable temperature difference (delta) between stages
and an adjustable deadband between heating/cooling setpoints. These control unit variables can be
changed via network commands. The examples below are based on the default settings.
In the HEAT mode, the stage 1 heating will be turned on at one degree below the heating setpoint and will
turn off at the setpoint. In the COOL mode, the stage 1 cooling will be turned on at one degree above the
cooling setpoint and will turn off at the setpoint. This is referred to as the setpoint delta. It is default set to 1
deg but can be changed via network commands.
Second stage heating/cooling deltas are factory set at 3 degrees. This means that second stage will come
on when the delta from setpoint reaches 3 degrees. Second stage heating/cooling calls will stay on until the
first stage setpoint is satisfied.
In the AUTO mode, the system will maintain the heating or cooling setpoints and switch automatically from
heating mode to cooling mode as needed. There is a deadband between heating and cooling setpoints that
keeps the two setpoints from overlapping. This is default set to 4 degrees, but can be changed.
Setpoint Push. If you adjust the heating setpoint to be less than 4 degrees from the cooling setpoint, the
cooling setpoint will be pushed to maintain the 4 degree deadband separation. Same for adjusting the
cooling setpoint, if you get within the deadband separation, the heating setpoint will be pushed.
Minimum Run Time (MRT). The HVAC control unit has a minimum run time that starts with every heating
or cooling call. The HVAC system will run this minimum time even if the temperature reaches setpoint before

DCN: 141-00930-07 09/06/04 9
MRT times out. However, if the mode is set to Off, the MRT will be canceled and the system will turn off
immediately. The default MRT is set to 6 minutes but can be adjusted by the network system variable
command from 1 to 9 minutes.
Minimum Off Time (MOT). The HVAC control unit has a minimum off time after every heating or cooling
call is completed. This off time is used for short cycle protection to prevent compressor damage after
cooling calls (and heat calls for Heat Pumps). In addition, the MOT helps both Standard and HP systems to
prevent rapid cycling of the system, caused by quick temperature changes. The default MOT time is set to 6
minutes but can be adjusted by the system variable network command from 5 to 9 minutes.
The Status LED on the Control Unit circuit board will flash twice during MOT/MRT periods.
Standard HVAC System Setup
Standard System Mode Selection. To set the Control Unit for standard GAS/ELECTRIC operation, set the
dipswitch SW1 position 1 to the STD SYS position (SW1-1 = OFF).
Fan Mode Selection. Normally, GAS heating systems DO NOT require fan calls along with the heat call
due to automatic fan operation in the furnace. For Gas systems, dipswitch SW1 position 2 should be set to
the OFF position (SW1-2 = OFF).
Electric heating systems generally DO require that a fan call be generated along with the heat call. For these
systems, dipswitch SW1 position 2 should be set to the ON position (SW1-2 = ON). Be sure to check your
HVAC system’s requirements.
TR16 Control Unit HVAC System Outputs for Standard Systems
Operating Mode Outputs (no Fan with Heat) Outputs ( Fan with Heat)
Manual Fan GG
Cooling Stage 1 G, Y1 G, Y1
Cooling Stage 2 G, Y1, Y2 G, Y1, Y2
Heating Stage 1 W1 G, W1,
Heating Stage 2 W1, W2 G, W1, W2
HEAT PUMP HVAC SYSTEM OPERATION
The TR16 has Heat Pump operating modes of Heating, Cooling, Auto changeover and Emergency Heat.
The Heat Pump HVAC system operation is the same as for Standard systems for normal first and second
stage operations. In addition, Heat Pumps may have a third stage of heating, which is for Auxiliary Heat
(such as heat strips). The third stage comes at 5 degrees (default) from setpoint and stays on until
temperature drops to 3 degrees from setpoint.
Emergency Heat Mode. When the Control Unit HVAC System Type is selected as a Heat Pump system,
an additional operating mode of “Emergency Heat” (EH) can be selected from the WDU mode menu. In the
event of a compressor failure, the “EH” mode can be selected. When in this mode, the stage 3 auxiliary heat
(heat strips) output (W1) will be ON in lieu of stage 1 heat calls. Compressor stages 1 (Y1) and 2 (Y2)
outputs are inhibited to protect from further equipment damage. This mode is for temporary use until the
compressor can be repaired.
The EH mode can also be used during extreme low outdoor temperatures when compressor heating is
inadequate and Auxiliary Heat is required for heating operation.

DCN: 141-00930-07 09/06/04 10
Minimum Run Time (MRT). Heat Pump systems have the same MRT delays as Standard systems.
Minimum Off Time (MOT). Heat Pump systems have the same MOT delays as Standard systems.

DCN: 141-00930-07 09/06/04 11
Heat Pump HVAC System Setup
Heat Pump Type Selection. For Heat Pump systems, set the HVAC system type, SW1 position 1 to the
ON position (SW1-1 = ON).
Change Over Selection. Heat Pump systems change from heating to cooling by reversing the direction of
refrigerant flow in the system. The change from Heating to Cooling is controlled by the CHANGEOVER (CO)
output from the Control Unit (also referred to as the “reversing valve” output). These are the O and/or B
terminals on Heat Pump thermostat connections. Always use the O terminal input on the Heat Pump
system and select the CO type on the controller as required.
Changeover with Cooling. This is typical of most heat pump systems, which are designed to work
normally in the heating mode and require a changeover output for cooling. To select this CO type, set
dipswitch SW1 position 3 to the OFF position (SW1-3 = OFF). This is the default setting.
Changeover with Heating. If your system requires changeover with heating, set SW1 position 3 to ON
position (SW1-3 = ON).
Changeover Relay Operation: The changeover relay output stays ON after a heating/cooling call for the
duration of the MOT minimum off delay period. If another call occurs before the delay period expires, the CO
relay will already be on and this avoids continuous on/off cycling the CO valve for each call. After the MOT
period expires and another call is not active, the CO output will go OFF.
TR16 Control Unit HVAC System Outputs for Heat Pump Systems
Operating Mode Changeover with Cool Changeover with Heat
Manual Fan GG
Cooling Stage 1 G, O, Y1 G, Y1,
Cooling Stage 2 G, O, Y1, Y2 G, Y1, Y2,
Heating Stage 1 G, Y1 G, O, Y1,
Heating Stage 2 G, Y1, Y2 G, O, Y1, Y2
Heating Stage 3 G, Y1, Y2, W1 G, O, Y1, Y2, W1
Emergency Heat G, W1 G, W1
Status LEDs
The Control Unit has a Status LED on the circuit board that will normally blink on and off slowly as a system
heartbeat. During short cycle protection delay periods, the LED will blink twice for each heartbeat. This
indicates that the compressor is locked out during this time. The other LEDs indicate the operation of the
control unit output relays. When the LED’s are on, the output relay is on.
LED Function Control Unit Output
H1 Heat stage 1 output (Heat stage 3 for HP systems) W1
Fan Fan output G
C1 Compressor stage 1 output Y1
C2 Compressor stage 2 output Y2
H2/CO H2 = Heat stage 2 output for Standard HVAC systems
CO = Changeover valve output for Heat Pump HVAC systems.O (W2) O
Heat Pump changeover (reversing valve) output is dependent on the control unit Dipswitch SW1-3 setting.
Change over is either with cool (normal) or with heat.

DCN: 141-00930-07 09/06/04 12
Serial Communications
Serial Communications
The TR16 Control Unit has a RS485 serial communications port. RS485 communications is two wire, half
duplex. Commands from remote systems can change the setpoint temperatures and mode of the
Thermostat. The Control Unit connects to the serial wiring via a 4 wire connector (with optional 12VDC
power). Serial commands received by the Control Unit can set a new setpoint or a new mode and are sent to
the WDU to update its display. When serial commands that update the setpoint or mode are received, the
WDU will switch it’s display to show the updated information for three seconds and then return to the current
temperature display.
TR16 Thermostats also responds to request for status by serial commands and can provide all thermostat
data and setup information as well as the current revisions of the WDU and Controller firmware.
Address Setting
The TR16 serial communications address is set from the Wall Display Unit by entering the setup mode. To
enter the setup mode, press and hold the Mode button and simultaneously press the Fan button. This enters
the setup mode and “Ad” will be displayed. Set the desired address by pressing the UP/DOWN buttons until
the desired address from 1 to 99 is selected. The default address is 1.
Serial Protocol
The TR16 thermostat has a robust serial protocol. It is based on a simple ASCII message format as
described in the RCS Serial Communications Protocol manual, DCN# 150-00225.
Note: NOT ALL of the commands/variables defined in the protocol document are applicable to the TR16,
check Section 8 of the protocol manual for details.
The following thermostat information can be sent to or requested from the thermostat by the serial protocol.
•Temperature
•Heating setpoint
•Cooling setpoint
•System Mode
•Fan Mode
•F/C mode
•HVAC output status
•Network Address
•Any system variable
•System firmware revisions
Serial Communications Setup
To communicate to TR16 thermostats, set the communications parameters of the host system to: 9600
baud, no parity, 8 bits, 1 stop bit and No flow control.
Transmission delay. The TR16 will delay responses to request messages for 5mS to conform to the RCS
CommStar network protocol. This is necessary for RS485 half duplex devices to use Send Data Control for
automatic flow control.

DCN: 141-00930-07 09/06/04 13
TR16 Installation
Before proceeding with removing an existing thermostat and installing the TR16,
Read the following important steps.
1. Record existing wiring information on the enclosed wiring form.
2. Perform the TR16 bench test
3. Check WDU wiring BEFORE applying power to control unit.
4. Be sure to install a freeze protection device as required.
Installation Overview
Standard thermostat wiring vs TR16 in retrofit applications.
STOP
Freeze Protection.
In cold climates that require the heating system to be used for building freeze protection, a mechanical
backup freeze protectio
n device MUST be installed on the heating system. This can be a simple mechanical
heating thermostat or a preset thermoswitch installed in the heated area.
Heating
System
Red Wire 24VAC R
White Wire Heat W
40-45°R
W
Thermostat connections
Wire across Heater R/W terminals.
Mechanical
Thermostat or
Thermoswitch
Heating &
Cooling
System
4, 5 or 6 wires
18Ga thermostat wiring
4 Wires
TR16
Control
Unit
Heating &
Cooling
System
TR16
Wall Display Unit
Thermostat
Replace
Thermostat with
Wall Display Unit
Insert Control Unit into
the thermostat wiring
4,5 or 6 wires as
original
installation
OLD
NEW

DCN: 141-00930-07 09/06/04 14
TR16WallDisplayUnitInstallation
WDU Location Choose a location that best represents the temperature of the area to be controlled. Avoid
locations that are subject to drafts, from doors and windows, or areas with direct sunlight exposure.
WDU Mounting Route the wires to the WDU through the access hole in the back of the case. Mount the
WDU to the wall with the screws and anchors provided. Be sure to plug any large access hole in the wall
with sealer or insulation to prevent wall drafts from affecting WDU operation.
WDU Prewiring The recommended wiring to the WDU from the Control Unit should be a two twisted pair
cable, 24 Ga minimum. Cat 3 or 5, 4 pair cabling is acceptable. In retrofit applications the existing thermostat
wiring (a least 4 wires) may be adequate. However, such non-twisted wiring may be subject to interference
due to noise from adjacent wiring or other sources.
Wiring to the Wall Display Unit
Remote Sensor Wiring
G
+12
C
D
1 POWER GND
2 POWER +
3 COM CLOCK
4 COM DATA
WIRING
ACCESS
HOLE
J1
WDU WIRING DIAGRAM
TS16 WDU
BASE
Hook TOP here
and rotate into
base. Be sure
pins engage in
connector ok.
TO CLOSE
OPENING AND CLOSING THE WDU CASE
TO OPEN
PULL FROM LOWER CORNERS OPEN
CLOSE
BASE
For Remote Sensor
G
+5
C
D
J2
TR16 CONTROL UNIT
GND G
+12VDC +V
CLOCK C
DATA D
TWISTED PAIR 22 GA WIRE RECOMMENDED
TR16 WALL DISPLAY UNIT
WDU
+12V
GND
DATA
CLK
J1
** CAUTION **
DO NOT MISWIRE
WDU
CONNECTIONS
OR
DAMAGE WILL
RESULT

DCN: 141-00930-07 09/06/04 15
The TS16 WDU has an addition connector, J2, on the WDU base for connection of an external remote
temperature sensor. Follow the wiring diagram with the remote sensor to connect to the WDU.

DCN: 141-00930-07 09/06/04 16
TR16ControlUnitInstallation
Location and Mounting
Install the TR16 Control Unit in a protected, convenient, INDOOR location near the HVAC system or in a
service accessible area such as an equipment closet or garage.
Mount the Control Unit in a vertical position on a wall or sturdy structural member. The unit may be mounted
on the HVAC system but care should be taken to avoid the hot burner section or high vibration areas.
Control unit wiring
The TR16 HVAC Control Unit is connected to the HVAC system and to the Wall Display Unit as well as the
serial communications and power connections.
Control Unit to WDU wiring
Connect the WDU to the Control Unit with existing thermostat wiring in retrofit installations. For new installs,
22/24 GA twisted pair, typically Cat 3 or Cat 5 wiring is preferred.
Control Unit to HVAC System wiring
Electrically, the Control Unit looks like a standard thermostat to your HVAC system. All connections to the
HVAC system are made at the normal thermostat connections on the HVAC unit.
You are advised to refer to your HVAC system’s documentation for specific information on its thermostat
connections and setup requirements. You must know the following:
1. HVAC system type: Gas, Electric, or Heat Pump
2. Fan requirement: No fan with Heat or Fan with Heat
3. For Heat Pump systems: Changeover with cool or with heat. (O or B connection)
Note on retrofit wiring. You may note (and be sure to note on the wiring form) that you have additional
wires when you disconnect your old thermostat. Usually these wires are for auxiliary functions such as filter
or trouble indicators. For Heat Pump systems there may be emergency heat (EH) wiring or both O and B
changeover connections. These wires are not used in the TR16 installation and, in most cases, these extra
wires are not required for normal HVAC system operation.
WDU
+12V
GND
D
C
J1
GND G
+12VDC +V
CLOCK C
DATA D
TS16
Control Unit

DCN: 141-00930-07 09/06/04 17
Refer to the following HVAC wiring diagrams for your type of HVAC system, Standard Or Heat Pump.

DCN: 141-00930-07 09/06/04 18
HVAC System Wiring
Diagram 1 -Standard Gas or Electric System Wiring
Standard HVAC System Setup Notes:
Single Stage Systems use W1 for heating stage 1, and Y1 for cooling stage 1.
Two Stage Heating systems use W1 for stage 1 and W2 for stage 2 heating.
Two Stage Cooling systems use Y1 for stage 1 and Y2 for stage 2 cooling.
If you have an integrated heating and cooling system with a single transformer, do NOT remove the jumper
between RC and RH and wire the system red wire to either RC or RH.
If you have a separate heating and cooling systems with separate transformers, remove the jumper and wire
the cooling red wire to RC and the heating red wire to RH.
Standard HVAC System
G Fan
W1 Heat Stage 1
Y1 Comp Stage 1
R 24VAC Return
C 24VAC Common
Red
Green
White
Yellow
RH
W1 Heat 1
G Fan
Y1 Comp 1
Y2 Comp2
HVAC
SYSTEM
Thermostat
Connection
TR16 Control Unit
Typical thermostat wiring color
codes
W2 Heat Stage 2
RC
IMPORTANT! For typical central heating/cooling systems, leave
jumper installed. If you have separate Heating and Cooling system
transformers, REMOVE JUMPER. Wire RC to the Cooling system
transformer and RH to the Heating system transformer.
J5
O (W2)
Y2 Cool Stage 2
Orange
Black
Standard System Dipswitch SW1 Setup
1. SW1-1 (position 1) Set to Off -to the left (STD)
2. SW1-2 (position 2) Set to the correct setting for your HVAC system.
a. Gas furnacesdo not require fan outputs for heating calls. Set SW1-2 to the Off -to the left.
b. Electric furnacesdo require fan outputs for heating calls. Set SW1-2 to the On -to the right.
3. SW1-3 (position 3) Not used. For HP systems only.
4. SW1-4 (position 4) Not used. F/C mode now set from the Wall Display Unit setup menu.
5. SW1-5/8 (positions 5-8) Not used. Address now set from the Wall Display Unit setup menu.
CO C/H
FAN/HT
SW1
OFF ON
1
2
3
4
5
6
7
8
STD/HP
For Standard HVAC
systems the O terminal
is used for W2 output.
Not
Used
Note: Fan is powered
from the RC source
when using split
transformers

DCN: 141-00930-07 09/06/04 19
HVAC System Wiring
Diagram 2 -Heat Pump System Wiring
Heat Pump HVAC System Setup Notes:
Single Stage Compressor Systems use Y1 for stage 1 heating/cooling, and W1 for stage 2 heating (heat
strips).
Two Stage Compressor Systems use Y1 for stage 1 and Y2 for stage 2 heating/cooling, and W1 for stage 3
heating (heat strips).
NOTE: You must configure the Changeover valve setting to work correctly with your HVAC system.
Set Dipswitch SW1 as below for correct changeover with cool (typical) or changeover with heat.
IMPORTANT! Do not remove the jumper for Heat
Pump Systems. RC and RH are common for Heat
Pumps.
Heat Pump HVAC System
G Fan
W1 Heat Stage 1
Y1 Comp Stage 1
R 24VAC Return
C 24VAC Common
Red
Green
White
Yellow
RC
W1 Heat 1
G Fan
Y1 Comp 1
Y2 Comp 2
HVAC
SYSTEM
Thermostat Connection
TR16 Control Unit
Typical thermostat wiring color
codes
Y2 Comp Stage 2
RH
J5
O CO O Changeover Valve
Orange
Black
Heat Pump System Dipswitch SW1 Setup
1. SW1-1 (position 1) Set to On -to the right (Heat Pump)
2. SW1-2 (position 2). Not used. For Standard systems only.
3. SW1-3 (position 3) Set to the correct changeover (reversing valve) setting for your Heat Pump system.
a. For systems with Changeover with Cooling, Set SW1-3 to Off -to the left
b. For systems with Changeover with Heating, Set SW1-3 to On -to the right
4. SW1-4 (position 4) Not used. F/C mode now set from the Wall Display Unit setup menu.
5. SW1-5/8 (positions 5-8) Not used. Address now set from the Wall Display Unit setup menu.
STD/HP
Not
Used
CO C/H
FAN/HT
SW1
OFF ON
1
2
3
4
5
6
7
8

DCN: 141-00930-07 09/06/04 20
Serial Communications Port
RS485 Wiring
Connecting to RCS CommStar Controllers:
Model CS30 has one RS485 port.
Model CS308 has eight RS485 ports.
You can add up to 8 additional 8 Channel RS485 Star Hubs to either the CS30 or CS308 Controllers.
Power Connection
The TR16 Control Unit can be powered by two power connection options.
1. External 12VDC power. Connect the 12VDC power transformer supplied to J4.
2. Power from the Communications Network. You can provide power to the TR16 Control Unit via the
RS485 Network. Connect 12VDC to the RS485 Network terminals.
RS485 Network Connection
Optional 12VDC
Power
connection
J3
RS485
TR16
Control Unit
+V
G
R
-
T +
J3
Optional power
from the network
RS485 Port
12V
GND
D
-
D +
RS485
Source Input
RS232
Source Input
12VDC
For Hubs, select the
correct converter based
on the input source
Connecting to
RCS CommStar Controllers
or a RS485 Hub
or a RS232/485 Converter
or Data +
Data –
Model 485PB: RS232 to RS485 Converter w/5 common outputs.
Model 8AH232: RS232 to RS485 Converter + 8 Channel Star Hub.
Model 8AH485: RS485 8 Channel Star Hub
Gnd