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.
The TR16 thermostat provides the latest technology in a full-featured universal thermostat with serial communications.
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.
Control Buttons Setpoint UP and DOWN 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.
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.
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.
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.
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).
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.
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.
TR16 Installation STOP Before proceeding with removing an existing thermostat and installing the TR16, Read the following important steps. 1. 2. 3. 4. Record existing wiring information on the enclosed wiring form. Perform the TR16 bench test Check WDU wiring BEFORE applying power to control unit. Be sure to install a freeze protection device as required. Installation Overview Standard thermostat wiring vs TR16 in retrofit applications.
TR16 Wall Display Unit Installation 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.
TR16 Control Unit Installation 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.
HVAC System Wiring Diagram 1 - Standard Gas or Electric System Wiring TR16 Control Unit FUSE IMPORTANT! For typical central heating/cooling systems, leave jumper JP1 installed. If you have separate Heating and Cooling system transformers, CUT JUMPER JP1. Wire RC to the Cooling system transformer and RH to the Heating system transformer.
HVAC System Wiring Diagram 2 - Heat Pump System Wiring TR16 Control Unit FUSE SW1 STD 1 S2 2 IMPORTANT! Do not cut JP1 for Heat Pump Systems. RC and RH are common for Heat Pumps.
TR16 Power Connection The TR16 Control Unit requires 24VAC power from the HVAC system it is controlling. Connect the 24VAC Common (typically the Blue wire/terminal) and 24VAC R (typically the Red wire/terminal) from the HVAC system to the control unit’s HVAC System terminal block J4’s 24VCom and 24V RH or 24V RC terminals (the RH and RC terminals are default jumpered together…see below) Common or Split Transformer Systems Most HVAC systems have a common heating and cooling transformer.
Thermostat Network Commands Serial commands received by the Control Unit can set a new setpoint or a new mode and when received they are sent to the WDU to update it’s 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. The following thermostat information can be sent to or requested from the thermostat by the serial protocol.
System Checkout It is strongly recommended that you hook-up and run a simple bench test before installing the TR16. Not only will this save you time in system checkout but will also familiarize you with the thermostat’s operation. THERMOSTAT BENCH TEST 1. Connect the Wall Display Unit to the Control Unit with a short (12-24 inch) 4 wire cable. 2. Before power up, set the Control Unit dipswitch, SW1, to ALL OFF 3. Connect power to the Control Unit. 4. Verify Control Unit Status LED is blinking. 5.
HVAC System Testing If you need to verify that the HVAC system is operational, you can perform the following test Thermostats, like the TR16, are just switches to the HVAC system as shown in the diagram below. This is a simplified example of a thermostat and a standard HVAC wiring diagram. The HVAC system operation can be tested by duplicating the thermostat switch operation by shorting across the thermostat terminals on the HVAC system.
RCS TR16 Wiring Diagram TR16 CONTROL UNIT SW1 S1 1 HP S2 2 OFF ON TS16 WALL DISPLAY UNIT Fuse Mini ATO 2 Amp RH=RC WDU GND G +12VDC +V GND Cut Jumper to split J1 24V COM STATUS CLOCK C C DATA D D HEAT1 HEAT2 CO J2 C - 24VAC Common Red R - 24VAC Return W1 White W1 – Heat Stage 1 Orange FAN COMP1 D+ D- COMP2 THERMOSTAT CONNECTOR 24V RC W2 / O* GND W2/O* – Heat Stage2 G Green Y1 Yellow Y1 – Comp Stage 1 Y2 Black Y2 – Comp Stage 2 J4 HVAC SYSTEM Optional RS485 RJ45 Co
Appendix A TR16 Serial Network Command and Variable List Refer to the RCS Serial Communications Protocol Manual, DCN 150-00225 for details of message formats and commands. These may change with newer firmware versions. Network Message Format: Device Address, Originator (optional if address is 0), Command Example command: A=1 O=0 R=1 or just A=1 R=1 Translates to a command for thermostat address 1, (originator address = 0), Request Status command R1.
