RCS TR16 Installation And Operation Manual

RCS

Residential Control Systems Inc.

Model TR16

Communicating Thermostat

With RS485 Communications

INSTALLATION AND OPERATION MANUAL

Rev P HVAC Control Unit

DCN: 141-00930-09

Rev 09

7/13/06

This revision of the document applies to the following part numbers and revisions or later.

DO NOT USE THIS PRODUCT FOR BUILDING FREEZE PROTECTION! YOU ARE ADVISED TO

Product Rev Part No Firmware

TR16-485 Thermostat P 001-00930-30
TS16 Wall Display Unit G 001-00910-12 TS16v340
HFR-485 HVAC Control Unit P 001-01430-03 HFR3052

*** IMPORTANT NOTICE ***

INSTALL A MECHANICAL FREEZE PROTECTION DEVICE FOR THIS PURPOSE.

TR16 Operation

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

o Network Address
o F/C temperature display mode
o Sensor 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.

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: 141-00930-09 7/13/06

2

r

TS16 Wall Display Unit

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

Shows current temp normally.

Shows setpoint or mode

when buttons pushed.

Setback Mode On Indicato

Setpoint Increase Button

Setpoint Decrease Button

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

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 “- -“.

TS16 WDU

.7.5

MODE

FAN

Manual Fan On Indicator

System Mode Button
Manual Fan Button

DCN: 141-00930-09 7/13/06

3

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.

NOTE: You cannot change the setpoint when in the OFF mode.

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 Heat to 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 display will come on when the manual fan is ON. Changes in the fan mode will be sent
to the HVAC Control Unit.

MODE Button

FAN Button

Setpoint UP and DOWN Buttons

DCN: 141-00930-09 7/13/06

4

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) “

Viewing the Network 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.

Changing the Network Address. While the current address is being displayed, as above, use the
UP/Down buttons to set the new network address desired, 1 to 254 (default set to 1). Since the TS16
WDU has only two digits of display, the decimal point between the digits is used to indicate when you are
in the 100 to199 range (shown as 0.0 to 9.9). The decimal point to the left of the digits is used to indicate
addresses in the 200 to 254 range (shown as .00 to .54). To exit press the mode button again or wait for
the screen to time out and return to the normal thermostat temperature display.

Setting the Fahrenheit or Celsius mode

In the setup mode, press the mode button to select “FC” mode. The TR16 is default set to F mode.
To change the degree mode, press the UP/DOWN buttons to select F or C as desired. To exit press mode
again to move another setup mode or wait for the screen to time out and return to the normal thermostat
temperature display.

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 5 seconds, the display will automatically
exit setup mode and return to the thermostat mode and current temperature display.

Temperature Display Calibration

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

DCN: 141-00930-09 7/13/06

5

remote sensors 1 and 2. If they are detected by the TS16, they will show up in the calibration menu as
additional sensors to calibrate as C1 and C2. Note that if remote sensor with address 1 is attached it
replaces the internal sensor and 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)

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)

Table of Remote Sensor Functions and Sensor Addresses

Function Remote Addr 1 Remote Addr 2

Use internal sensor only No Yes
Used as remote sensor only Yes No
Average internal and one remote No Yes
Average two remotes (only 2) Optional with A2 Yes with A1

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 for details on this command.

“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: 141-00930-09 7/13/06

6

TR16 HVAC Control Unit

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 2 2 Single or split transformer
Electric 2 2 Selectable Fan with Heat
Heat Pump 3 2 Selectable 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 MRT times out. However, if the mode is set to Off, the MRT will be canceled and the

DCN: 141-00930-09 7/13/06

7