RCS TZ16 Installation And Operation Manual

RCS Residential Control Systems Inc.

Model TZ16

Z-Wave Communicating Thermostat

with Rev P HVAC Control Unit

INSTALLATION AND OPERATION MANUAL

DCN: 141-00882

Rev 02

5/18/06

Product Part No

This manual applies to the following product revisions or later

TZ16 Thermostat 001-00882-07
TS16 Wall Display Unit 001-00910-12
HFRP HVAC Control Unit 001-01430-03
ZWBT-485 Z-Wave Thermostat Adapter 001-01030-06

*** IMPORTANT NOTICE ***

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

INSTALL A MECHANICAL FREEZE PROTECTION DEVICE FOR THIS PURPOSE.

TZ16 Operation

The TZ16 thermostat provides the latest technology in a full-featured universal thermostat with serial
communications. The TZ16 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

• Supports the latest Z-Wave thermostat protocol

The TZ16 thermostat consists of three parts, a Wall Display Unit (WDU), the HVAC Control Unit and the
ZWBT Z-Wave Thermostat adapter. 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 ZWBT provides connection to the Z-Wave network.

The TZ16 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).

In addition to the universal Standard or Heat Pump HVAC systems support, the TZ16 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 TZ16 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 TZ16 has automatic detection and setup of remote temperature sensors. Remote sensors have
address settings that, when detected by the TZ16, will be used for specific functions, such as, in lieu of the
internal sensor or averaging with internal or remote other sensors.

The TZ16 can be used with system controllers that support the Z-Wave thermostat protocol.

TZ16 Thermostat Block Diagram

Wall Display Unit

TZ16 Thermostat

4 Wires

HVAC Control Unit

4 Wires

Z-Wave
Adapter

4-8 Wires depending on the HVAC system.

*NOTE: Must have both 24VAC Common and
24VAC Return power connections to the HVAC
system.

HVAC System

Thermostat
Connections

24C*
24R*
W1
W2
G
Y1
Y2

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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 Indicator

Setpoint Increase Button

Setpoint Decrease Button

TS16 WDU

.7.5

MODE

FAN

Manual Fan On Indicator

System Mode Button
Manual Fan 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°.)

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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 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

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Setup Mode

The TZ16 has a setup mode to allow the user to set the following functions from the WDU:

• Network Address (NOTE: Must be set to “1” for use with the Z-Wave thermostat adapter.)

• 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)

Setting the Address

When you first enter the setup mode, the first menu selection displayed on the LCD display is “Ad”.
This is default set to “1”. DO NOT CHANGE THIS. The Z-Wave thermostat adapter requires the HVAC
controller to be set to address 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 “C3” 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

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. 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.

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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)
Address 3: Not used on TS16 wall display units
Address 4: Not used on TS16 wall display units

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 Not used
Used as remote sensor only Yes No Not used Not used
Average internal and one remote No Yes Not used Not used
Average two remotes (only 2) Optional with A2 Yes with A1 Not used Not used

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.

“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.

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The TZ16 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 Z-Wave network commands for
remote control of the heating/cooling setpoints and mode of the thermostat.

The TZ16 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.

TZ16 HVAC Control Unit

HVAC System Compatibility

The TZ16 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 TZ16 has typical HVAC system operating modes of Heating, Cooling and Auto changeover.
In additional to the multiple stages, the TZ16 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 system will
turn off immediately. The MRT is set to 6 minutes.

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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 MOT time is set to 6
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.

TZ16 Control Unit HVAC System Outputs for Standard Systems

Operating Mode Outputs (no Fan with Heat) Outputs ( Fan with Heat)

Manual Fan G G
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 TZ16 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.

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.

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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.

TZ16 Control Unit HVAC System Outputs for Heat Pump Systems

Operating Mode Changeover with Cool Changeover with Heat

Manual Fan G G
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.

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Z-Wave Communications

Z-Wave Communications

The TZ16 Control Unit connects to a ZWBT-485 Z-Wave thermostat adapter.
The ZWBT requires theTZ16 HVAC controller be set to Serial Address 1 (default setting). Do not

change the thermostat address from the Wall Display Address.

Connecting the TZ16 to a Z-Wave Network

Once the TZ16 control unit is connected and powered up you can add the thermostat to the Z-Wave
network via the handheld Z-Wave remote control (not supplied).

Using normal Z-Wave module enrollment procedures, press the program button on the ZWBT adapter
when prompted by the Z-Wave remote control unit.

Z-Wave Thermostat Protocol

The TZ16 Thermostat supports the latest Z-Wave thermostat protocol. Systems that can send and receive
these commands can communicate with the TZ16 thermostat.

Receiving Z-Wave Commands

Z-Wave commands received by the Control Unit can set a new setpoint or a new mode. When they are
received, the WDU will update its display and switch to show the new setpoint or mode for three seconds
and then return to the current temperature display.

Thermostat Status

Z-wave controllers can query the Z-Wave thermostat for the current temperature, heating/cooling setpoints,
and system mode.

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Thermostat

Control Unit into

TZ16 Installation

Before proceeding with removing an existing thermostat and installing the TZ16,

Read the following important steps.

1. Record existing wiring information on the enclosed wiring form.

2. Perform the TZ16 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 TZ16 in retrofit applications.

STOP

OLD

NEW

Heating &
Cooling

4, 5 or 6 wires
18Ga thermostat wiring

Replace
Thermostat with
Wall Display Unit

4 Wires

TZ16

Wall Display Unit

Freeze Protection.

In cold climates that require the heating system to be used for building freeze protection, a mechanical
backup freeze protection 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.

Insert
the thermostat wiring

TZ16

Control

Unit

4,5 or 6 wires
as original
installation

System

Heating &
Cooling
System

40-45°

Mechanical
Thermostat or
Thermoswitch

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R
W

Wire across Heater R/W terminals.

Red Wire 24VAC R
White Wire Heat W

11

Heating
System

Thermostat connections

1 POWER GND

2 POWER +

3 COM CLOCK

4 COM DATA

ACCESS

J1

Hook TOP here

CLOSE

BASE

GND G

+12VDC +V

CLOCK C

DATA D

+12V

GND

DATA

CLK

TZ16 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. 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

OPENING AND CLOSING THE WDU CASE

PULL FROM LOWER CORNERS

TO OPEN

OPEN

TO CLOSE

and rotate into
base. Be sure
pins engage in
connector ok.

TS16 WDU

BASE

J2

G
+5
C
D

For Remote Sensor

G
+12
C
D

WIRING
HOLE

TZ16 WALL DISPLAY UNIT

** CAUTION **

DO NOT

MISWIRE WDU

CONNECTIONS

OR

DAMAGE WILL

RESULT

Remote Sensor Wiring

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.

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WDU WIRING DIAGRAM

12

TZ16 CONTROL UNIT

WDU

TWISTED PAIR 22 GA WIRE RECOMMENDED

J1

+12V GND D C

GND G

+12VDC +V

CLOCK C

DATA D

TZ16 Control Unit Installation

Location and Mounting

Install the TZ16 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 TZ16 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.

TS16

Control Unit

WDU

J1

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 TZ16 installation and, in most cases, these extra
wires are not required for normal HVAC system operation.

Refer to the following HVAC wiring diagrams for your type of HVAC system, Standard Or Heat Pump.

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STD

1

2

Set SW1

-S2 to OFF

connections to the TZ16

Diagram 1 - Standard Gas or Electric System Wiring

S2

Set SW1-S1 to STD

SW1

OFF ON

TZ16 Control Unit

FUSE

HP

JP1

RC&RH

24V COM
24V RH

24V RC

W1 Heat 1

W2 Heat 2
G Fan
Y1 Comp 1

Y2 Comp 2

J4

HVAC SYSTEM

HFRU REV P

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.

HVAC System 24VAC Transformer
Common Heating/Cooling System. If you have an integrated heating and cooling system with a single

transformer, do NOT cut jumper JP1. Wire the 24V Return (red) wire to either RH or RC. This is typical of
most central systems.

Separate Heating/Cooling Systems. If you have separate heating and cooling systems with separate
transformers, cut jumper JP1. Wire the heating 24V R (red) wire to the control unit’s RH terminal and run
the cooling systems 24V R (red) wire to control unit’s RC terminal. Also wire the cooling systems 24VAC
Com to the control units 24VAC Com terminal.

Dipswitch SW1 Setup for Standard HVAC Systems

1. Set SW1-1 (position 1) to the STD position. (Off - to the left) (default setting)

2. Set SW1-2 (position 2) to the correct setting for your HVAC system.
a. Gas furnaces do not require fan outputs for heating calls. Set SW1-2 to the Off - to the left. (default)
b. Electric furnaces do require fan outputs for heating calls. Set SW1-2 to the On - to the right.

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.

Standard HVAC System

THERMOSTAT CONNECTION

Red (or RH for split systems)

Red (or RC for split systems)

White

Orange

Green
Yellow

Black

C* 24VAC Common
R* 24VAC Return

Wire R to either RH or RC for common
transformer HVAC systems

W1 Heat Stage 1

W2 Heat Stage 2
G Fan
Y1 Comp Stage 1
Y2 Comp Stage 2

Typical thermostat wiring color codes

* Note! Must have both
the C and R 24VAC

HVAC Control Unit.

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Do not cut JP1 for Heat Pump Systems.

STD

1

2

OFF ON

connections to the TZ16

TZ16 Control Unit

SW1

HP

S2

Set SW1-S1 to HP
Set SW1-S2 to correct Changeover
valve setting

Diagram 2 - Heat Pump System Wiring

RC&RH

24C COM

24V RH

24V RC

W1 Heat 1
W2/O CO

G Fan

Y1 Comp 1

Y2 Comp 2

J4

HVAC SYSTEM

FUSE

JP1

IMPORTANT!

RC and RH are common for Heat Pumps.

Blue

Red

White

Orange
Green
Yellow

Black

Heat Pump HVAC System

THERMOSTAT CONNECTION

C * 24VAC Common
R * 24VAC Return

Wire R to either RH or RC

W1 Heat Strips (Heat Stage 3 )

O Changeover Valve

G Fan
Y1 Comp Stage 1
Y2 Comp Stage 2

HFRU REV P

Typical thermostat wiring color codes

Heat Pump HVAC System Setup Notes:

* Note! Must have both
the C and R 24VAC

HVAC Control Unit.

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, 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-S2 as below for correct changeover operation. Changeover with cool is typical
for most systems. Check your system information to be sure. If you get cooling when you expect
heating, change SW1-S2 to the other position.

Dipswitch SW1 Setup for Heat Pump HVAC Systems.

1. Set SW1-1 (position 1) to the Heat Pump position. (On - to the right)

2. Set SW1-2 (position 2) to the correct changeover (reversing valve) setting for your Heat Pump system.
a. For systems with changeover with cooling, Set SW1-2 to Off - to the left (default setting)
b. For systems with changeover with heating, Set SW1-2 to On - to the right

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Adapter

WDU

TZ16 Z-Wave Adapter

The TZ16 comes with an external Z-Wave adapter (ZWB) that connects to the TZ16’s RS485 port. The
RS485 port is dedicated to the Z-Wave adapter and cannot be used for other communications.

NOTE: DO NOT CHANGE THE DEFAULT RS485 ADDRESS OF THE THERMOSTAT (SET TO 1).

The TZ16 supports the standard Z-Wave protocol for thermostats.
Connect the adapter as shown and proceed with enrolling the device into your Z-Wave network.

ZWB Z-Wave Thermostat Adapter Wiring

1. Place the ZWB in a convenient location that gets good Z-Wave reception. You must have access
to the ZWB module to set the Z-Wave network address.

2. Connect the ZWB to the TZ16 HVAC control unit with 22-24Ga wiring. (Category 3-5 wiring
acceptable). Wiring can be up to 1000ft.

3. Connect the D+, D- and Gnd terminals on the ZWB module to the RS485 connection on the TZ16
control unit.

4. Connect the 12V terminal on the ZWB to the 12V terminal on the WDU terminal on the TZ16
control unit.

5. Power up TZ16 unit and observe that the ZWB Power LED is on.

6. Enroll the Z-Wave adapter in to the Z-Wave network using a Z-Wave network remote or other
control system interface.

7. Confirm Z-Wave message traffic with the Network LED.

8. Confirm Z-Wave thermostat operation

Power LED

Program

button

Note: Be sure to connect the Z-wave adapter
12V connection to the WDU 12V connection to
supply power to the unit.

ZWBT-485

Z-Wave Thermostat

RX/D-

TX/D+

Gnd
12V

Network
Data LED

GND
12V

C
D

RS485

GND
D +
D -

J2

TZ16

Control Unit

J1

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System Checkout

It is strongly recommended that you hook-up and run a simple bench test before installing the TZ16. 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. Verify the WDU display comes on and shows the current temperature.
a. If no display and backlights are not on, check wiring and power at the Control Unit.
b. If a “CF” display is shown on the WDU, double check your wiring to the Control Unit.

d. Do not proceed until the current temperature is displayed on the WDU.

6. With the current temperature displayed on the WDU, we have verified communication between it and the

Control Unit is OK. Any communication problems will result in a “CF” (Communications Failure) display on
the WDU and must be fixed before proceeding. If all is OK with the WDU proceed to the next step.

7. Press the Fan button on the WDU. The Control Unit’s Fan LED and relay should turn on.

8. Press the Fan button again. The Fan LED and relay should turn off.

9. Press the Mode button until the WDU is showing “H” for Heat Mode.

10. Press the Setpoint Up button until the setpoint is above the current temperature. The Heat LED and

relay should come on. (If they don’t, make sure the Status LED is not flashing twice indicating minimum off
delay…wait until LED stops flashing twice before proceeding).

11. Press the Mode button until the WDU is showing “O” for OFF. The Heat LED and relay will turn OFF.

12. Wait 6 minutes for the minimum off delay to expire. The Status LED will stop flashing twice.

13. Press the Mode button until the WDU is showing “C” for Cool Mode.

14. Press the Setpoint Down button until the setpoint is below the current temperature.

15. The Compressor and Fan LEDs and relays should turn on.

16. Press the mode button until the WDU is showing “O” for OFF Mode.

17. All LEDs and relays should turn off.

18. When you have successfully completed all these tests, you have verified that the TZ16 is working

correctly.

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HVAC System Testing

If you need to verify that the HVAC system is operational, you can perform the following test
Thermostats, like the TZ16, 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.

HVAC SYSTEM

STANDARD GAS/AC

TYPICAL THERMOSTAT

C 24VAC COMMON
R 24VAC HOT

24VAC

FAN
HEAT
COMP

G FAN

W HEAT
Y COMP

FAN

RELAY

GAS

VALVE

Thermostat
Connection

COMP

RELAY

Note: The HVAC system and thermostat connection voltage is 24VAC. This is a safe voltage to
work with but be careful to avoid shorting the 24VAC common (C) and 24VAC return (R) terminals.
This may blow a fuse in the HVAC system.

Standard HVAC System Quick Test

You can perform a quick test of the HVAC system by shorting across the appropriate thermostat terminals
on the HVAC thermostat connector. Use a short 6 inch wire to connect across the following terminals.

Function Test HVAC Terminals Result

Fan R to G Fan should come on
Heating R to W Heat cycle should start for heating
Cooling R to Y and G Compressor and Fan should start for cooling

Heat Pump System Quick Test

Similarly, you can test Heat Pump operation by shorting across the following terminals. Heat pump
operation is determined by compressor calls in conjunction with changeover (O) outputs. You must know
what your system CO type is (CO with Cool (typical) or CO with Heat). You should have configured the
TZ16 control unit for correct CO type, refer to this setting. Heat Pump systems have an additional O
terminal.

Function Test HVAC Terminals Result

Fan R to G Fan should come on
Heating R to Y and G Compressor and Fan should start and Heating

occurs.

Cooling R to Y and G and O Compressor and Fan should start.

CO valve operates and Cooling occurs.

Note: if you have the CO selection incorrect you will get cooling when you expect heating and vice versa.
Change the dipswitch SW1-3 changeover setting to correct this problem.

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Red

G

CO

Y2

SW1

1

OFF ON

HVAC SYSTEM

+12V

WDU

RCS

TZ16 Wiring Diagram

Rev P Control Unit

TS16

WALL DISPLAY UNIT

GND G

+12VDC +V

CLOCK C

DATA D

GND
12V

C
D

RS485

GND
D +
D -

ZWBT-485

Z-Wave

Thermostat

Program

RX/D -

TX/D +

GND

HVAC System Transformer:

Most central HVAC systems have a common heating and cooling transformer. This is the factory default
setting for Jumper JP1. In some cases, you may have separate heating and cooling systems, each with their
own transformer. In that case, cut Jumper JP1 and wire the heating transformer red wire to the RH terminal
and the cooling system transformer red wire to the RC terminal. Wire the cooling system’s 24VAC Com to the
control unit’s 24VAC Com terminal.

Dipswitch SW1 Settings: (White is switch position)

SW1-S1, STANDARD OR HEAT PUMP SYSTEM SELECTION

HVAC Systems can be either Standard Gas/Electric systems or Heat Pump systems.
Set S1 to STD SYS (OFF) for Gas/Electric systems (default setting).
Set S1 to ON for Heat Pump systems

TZ16 CONTROL UNIT

STD

S2

J1

STATUS

HEAT1

HEAT2

J2

COMP1

COMP2

HP

FAN

Fuse
Mini ATO
2 Amp

RH=RC

Cut Jumper

to split

J4

JP1

24V COM
24V RH
24V RC

W1

W2 / O*

Y1

HFRU REV P

Blue

White

Orange

Green
Yellow

Black

* for HP HVAC Systems
O=Changeover Valve

Typical Thermostat wiring colors.

HVAC SYSTEM

THERMOSTAT CONNECTOR

C - 24VAC Common
R - 24VAC Return

W1 – Heat Stage 1
W2/O* – Heat Stage2
G – Fan
Y1 – Comp Stage 1

Y2 – Comp Stage 2

SW1-S2 Fan or Change Over Valve Selection

If S1 is set to Off for Standard HVAC systems, then S2 selects the HVAC fan type.

Set S2 to OFF for gas systems that do not require Fan w/heat calls.(default setting)
Set S2 to ON for electric systems.

If S1 is set to On for HP HVAC systems, then S2 selects the changeover or reversing valve type.
Set S2 to OFF for changeover with cooling (default setting).
Set S2 to ON for changeover with heating

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