Installation, Operation and Maintenance

Compatible With

• 1-stage heating
• Supports optional floor sensor for radiant floor heating applications

WARNING: Please read carefully before proceeding with installation. Failure to follow any attached instructions or operating parameters may lead to the product's failure. Keep this Manual for future reference.

Installation

Preparation

Tools Required

• tekmar or jeweler screwdriver
• Phillips head screwdriver
• Wire stripper
• Drill (for wall anchor)
• 3/16" drill bit (for wall anchor)

Installation Location

Materials Required

• 18 AWG LVT Solid Wire (Low Voltage Connections)

A diagram shows an ideal installation location on an interior wall, away from doors and windows, with a green checkmark. Incorrect locations near windows or doors are marked with red 'X' symbols.

NOTICE

Consider the following for installation:

• Interior Wall.
• Keep dry. Avoid potential leakage onto the control.
• Relative Humidity less than 90%. Non-condensing environment.
• No exposure to extreme temperatures beyond 32-122°F (0-50°C).
• No draft, direct sun, or other cause for inaccurate temperature readings.
• Away from equipment, appliances, or other sources of electrical interference.
• Easy access for wiring, viewing, and adjusting the display screen.
• Approximately 5 feet (1.5m) off the finished floor.
• The maximum length of wire is 500 feet (150 m).
• Strip wire to 3/8" (10 mm) for all terminal connections.
• Use standard 8 conductor, 18 AWG wire.

Removing the Thermostat Base

While holding the base section in one hand, pull the lower half of the display front towards you to pivot it away from the base.

A diagram illustrates how to detach the thermostat front from its base.

Mounting the Thermostat

WARNING: To prevent the risk of personal injury and/or death, make sure power is not applied to the thermostat until it is fully installed and ready for final testing. All work must be done with power to the circuit being worked on turned off.

Local codes may require this thermostat to be installed or connected by an electrician.

Diagrams show the thermostat base being mounted to a wall, either directly or within a switch box, with wiring connections indicated.

Application 561-1

The WiFi Thermostat 561 operates a radiant floor heating system. The thermostat uses the built-in air temperature sensor.

Mechanical

Legend

• B1 = Boiler
• BP = Boiler Pump
• PS = System Pump
• T1 = WiFi Thermostat 561
• V1 = Zone Valve
• ZVC1 = Zone Valve Control 304V or 306V

A mechanical diagram illustrates the system components: Boiler (B1), Boiler Pump (BP), System Pump (PS), WiFi Thermostat (T1), Zone Valve (V1), and Zone Valve Control (ZVC1).

Electrical

An electrical wiring diagram shows the connections between the WiFi Thermostat 561 and the Zone Valve Control or Switching Relay (ZVC1), including terminals for C, R, AWAY, RH1, W1, SEN, COM, S1, and S2.

Application 561-2

The WiFi Thermostat 561 operates a radiant floor heating system based upon the floor temperature sensor. The built-in air sensor is disabled.

Mechanical

Legend

• B1 = Boiler
• BP = Boiler Pump
• PS = System Pump
• T1 = WiFi Thermostat 561
• S1 = Floor Sensor 079
• V1 = Zone Valve
• ZVC1 = Zone Valve Control 304V or 306V

A mechanical diagram illustrates the system components: Boiler (B1), Boiler Pump (BP), System Pump (PS), WiFi Thermostat (T1), Floor Sensor (S1), Zone Valve (V1), and Zone Valve Control (ZVC1).

Electrical

An electrical wiring diagram shows the connections between the WiFi Thermostat 561 and the Zone Valve Control or Switching Relay (ZVC1), including terminals for C, R, AWAY, RH1, W1, SEN, COM, S1, and S2, with a floor sensor (S1) connected.

Application 561-3

The WiFi Thermostat 561 operates a radiant floor heating system. The thermostat uses both air and floor temperature sensors. The air temperature sensor can be either built-in and/or external.

Mechanical

Legend

• B1 = Boiler
• BP = Boiler Pump
• PS = System Pump
• T1 = WiFi Thermostat 561
• S1 = Floor Sensor 079
• S2 = Optional Indoor Sensor 084
• V1 = Zone Valve
• ZVC1 = Zone Valve Control 304V or 306V

A mechanical diagram illustrates the system components: Boiler (B1), Boiler Pump (BP), System Pump (PS), WiFi Thermostat (T1), Floor Sensor (S1), Optional Indoor Sensor (S2), Zone Valve (V1), and Zone Valve Control (ZVC1).

Electrical

An electrical wiring diagram shows the connections between the WiFi Thermostat 561 and the Zone Valve Control or Switching Relay (ZVC1), including terminals for C, R, AWAY, RH1, W1, SEN, COM, S1, and S2, with a floor sensor (S1) and an optional indoor sensor (S2) connected.

Application 561-4

The WiFi Thermostat 561 operates a baseboard/radiator using an air temperature sensor. The air temperature sensor can be either built-in and/or external.

Mechanical

Legend

• B1 = Boiler
• BP = Boiler Pump
• PS = System Pump
• T1 = WiFi Thermostat 561
• S1 = Optional Indoor Sensor 084
• V1 = Zone Valve
• ZVC1 = Zone Valve Control 304V or 306V

A mechanical diagram illustrates the system components: Boiler (B1), Boiler Pump (BP), System Pump (PS), WiFi Thermostat (T1), Optional Indoor Sensor (S1), Zone Valve (V1), and Zone Valve Control (ZVC1).

Electrical

An electrical wiring diagram shows the connections between the WiFi Thermostat 561 and the Zone Valve Control or Switching Relay (ZVC1), including terminals for C, R, AWAY, RH1, W1, SEN, COM, S1, and S2, with an optional indoor sensor (S1) connected.

Sequence of Operation

Heating Operation

The heating setpoint can be set from 40 to 95°F (4.5 to 35°C). The Heat On symbol is shown on the display when the thermostat is heating. Heating for freeze protection is provided whenever the air or floor temperature falls below 40°F (4.5°C), regardless of operating mode.

Regular Heating

The W1 relay is on when the air temperature falls 1.5°F (1°C) below the Heat To setting. When the temperature reaches the Heat To setting, the relay turns off.

Radiant Floor Heating

When Radiant Floor Heating is selected in the setup menu, the W1 relay operates using Pulse Width Modulation. This improves comfort for radiant systems with high mass floors.

• 100% on time at Heat To setting -1.5°F
• 50% on time at Heat To setting
• 0% on time at Heat To setting + 1.5°F

Room Sensor and Averaging

The thermostat can measure room temperature between -46 to 212°F (-43 to 100°C). The room temperature can be measured using a combination of the built-in and auxiliary sensors:

• Built-in room sensor only
• Built-in room sensor with auxiliary room sensor(s) (temperature is averaged)
• Auxiliary room sensor only

Floor Sensor for Radiant Floor Heating

The thermostat can measure floor temperature between -46 to 212°F (-43 to 100°C). If a floor sensor is connected, floor minimum and maximum settings are available. The floor heating setpoint is adjustable from 40 to 100°F (4.5 to 38.0°C).

For a combination of air and floor temperature control, leave the internal air sensor on in the setup menu. A floor minimum can be used to prevent a fast drop in temperature caused by receding solar exposure. This operation is recommended for areas heated by afternoon sun through large windows. When the sun sets, it can take a long time for the floors to get warm again. This may cause the room to cool off too much in the early evening. A floor minimum setting can help with this condition by maintaining a floor minimum temperature. Keep in mind the floor minimum temperature will override the air temperature, and if set too high, may overheat the room.

A floor maximum is recommended for rooms with hardwood floors. Setting floor minimum and maximum temperatures is a way of enhancing the comfort of the living space while protecting floor coverings.

If there are more than one floor temperature sensors, the temperature is averaged.

Warm Weather Shut Down (WWSD)

The heating system can automatically shut off based upon the outdoor temperature and the WWSD setting. This provides a convenient way to shut off radiant floor heating.

User Interface

After 60 seconds of inactivity, the thermostat home screen displays only the time and the temperature.

Go to schedule

A diagram of the thermostat interface shows:

• Current time (10:30 AM)
• Outdoor temperature (60°)
• Current temperature (70°)
• Equipment operation (Heat On)
• Mode (Heat/Off)

Swipe to view:

• Weather
• Outdoor temperature
• Floor temperature
• Heat To setting

Change operating mode

Buttons for Mode, Heat, and Off are shown.

Go to settings

A menu selection screen shows options for AWAY, SCHEDULE, DISPLAY, TIME, WIFI, and SETUP.

Temperature Adjustment

Users can touch the up or down arrows to adjust the temperature. Options to 'Hold Until 5:00 PM' and 'Save to Schedule' are available. 'Save to schedule' applies the new temperature to the current schedule event. 'Hold' overrides the programmed schedule until the time shown.

User Settings

Away

Use the Away setting to save energy when the building is unoccupied. It operates normally or using the Away temperature selected in the Setup menu. Selecting the Away setting on a thermostat or the mobile app will affect all devices linked to that location through the app. The Away temperature can be adjusted in the Setup / Temps menu.

A diagram shows 'Home / Away' with options 'At Home' and 'Away'.

Schedule

The schedule allows users to set different temperatures for different times of the day. Users can navigate through program days, set heating temperatures, and create new schedules. 'Early Start' anticipates the time required to heat a room and starts early. 'Schedule On/Off' determines if the schedule is followed or if a constant temperature is maintained.

A diagram shows a schedule with Wake, Leave, Return, and Sleep periods, each with a time and temperature setting. Another diagram shows the 'Schedule Setup' interface for setting wake times and temperatures.

Display

This section details various display settings:

• TEMPERATURE UNITS: Select °F or °C. Default is °F.
• ENERGY USE: View heating or cooling operating hours daily or monthly. A diagram shows 'Daily Usage' with options to toggle to 'Monthly Usage'.
• BRIGHTNESS ACTIVE: Select screen brightness when touching. Range: 30 to 100%. Default: 100%.
• BRIGHTNESS INACTIVE: Select screen brightness when not in use. Range: Off, 30 to 100%. Default: 50%.
• BACKGROUND: Select background color (Light, Blue, Night, Latte, Espresso). Default: Blue.
• LANGUAGE: Select language (English, Español, Français). Default: English.
• SCREEN CLEAN: Locks screen for 10 seconds for cleaning. N/A for Range and Default.
• INACTIVE TIME DISPLAY: Select if time is visible when display is inactive. Default: On.
• INACTIVE OUTDOOR DISPLAY: Select if outdoor temperature is visible when display is inactive. Default: Off.

Time

The time can be set automatically when connected to the Internet. Manual setting of time and date is also possible using the arrow buttons.

TIME & DATE: Displays current date and time, with options to adjust.

OPTIONS:

• TIME FORMAT: Select 12 or 24 hour. Default: 12 hour.
• TIME SOURCE: Automatic or Manual. Default: Auto.
• TIME ZONE: Select local time zone (Hawaii, Alaska, Pacific, Mountain, Central, Eastern, Atlantic, Newfoundland). Default: Eastern.
• DAYLIGHT SAVING TIME: Off or On. Default: On.

NOTICE: Incorrectly setting the time and date manually may prevent communication with the mobile app. Automatic time source is recommended when using an Internet connection.

WiFi

NOTICE: Before using WiFi features, accept the Terms of Use available at Watts.com/terms-of-use. The product can be used without WiFi features if terms are not accepted.

The thermostat includes a step-by-step tutorial for WiFi setup:

• Step 1: Agree to Terms of Use - Requires pressing AGREE after reviewing terms.
• Step 2: Turn on WiFi - Select Off or On.
• Step 3: Enter wireless network name - Select network from a list (e.g., 'Your House').
• Step 4: Enter WiFi password - Input password using an on-screen keyboard.
• Step 5: Enter ZIP or postal code - Determines location for weather information.
• Step 6: Time Source - Select Automatic or Manual for time setting.

A diagram illustrates the WiFi setup process with screenshots for each step.

WiFi and Connectivity Troubleshooting

WiFi Connection Status

Press WiFi > WiFi:On > ⓘ to view connection status. The status screen shows IP Address, Subnet Mask, Gateway, MAC Address, Signal Strength, IoT Status, and Internet Status.

• (1) WiFi Signal Strength: Must be between 0 and -69 dB for a reliable connection. A WiFi extender is recommended if signal is between -70 to -100 dB.
• (2) Internet Connected: Indicates connection to the router and the Internet.
• (3) IoT Connected: Indicates connection to the Watts Cloud and readiness for app registration.

Check Password: Verify correct WiFi network and password. Password limits: 32 characters, includes upper/lower case, numbers, special characters, and spaces. Supports WPA2-Personal.

Power Off and On: Power cycle the thermostat and router.

Check Router & Firewall

Consult router manual or ISP for assistance. Requirements:

• Router must provide a 2.4 GHz signal (not compatible with 5 GHz).
• Router must use WPA2-Personal security.
• DHCP must be enabled with sufficient addresses.
• Router firewall must not block UDP/TCP ports: 53, 123, 443, 8883.
• Router firewall must not block connections to *.azure-devices.net.
• Router firewall must not block the thermostat based on a MAC filter list.

Network Troubleshooting

• Use the 'Route This Helps' tool (downloadable app). Enter code 'TEKM' for a network scan.

Create a WiFi Hotspot

If unable to connect, create a WiFi Hotspot on your mobile device. Instructions for Apple iOS and Android are provided via links.

If IoT is connected via hotspot, contact your ISP or IT professional.

Installer Settings

Setup

The Setup menu contains five sub-menus that determine thermostat operation. The Access Level in the Toolbox menu controls user access to settings.

A diagram shows the SETUP MENU with options: TOOLBOX, TEMP, SENSORS, ALERTS, RELAYS. A back arrow indicates returning to the main Settings menu.

Setup - Toolbox

Setup - Temp

Screen Page 1

Screen Page 2

Setup - Sensors

Setup - Alerts

Setup - Relays

Error Messages

An email notification is sent to the registered Watts Home mobile or account owner when an error occurs.

• INTERNET UNAVAILABLE: Thermostat has WiFi connection but cannot communicate to the Internet. Troubleshooting: Power cycle router and thermostat.
• MEMORY ERROR: Thermostat memory settings corrupted. Clear by loading factory defaults in the Toolbox menu. Thermostat will not operate heating equipment.
• INTERNAL ROOM SENSOR FAULT: Thermostat cannot read internal room temperature sensor due to open/short circuit. If Sensor 1 or 2 is set to room, thermostat continues operation; otherwise, it stops. Contact tekmar sales representative for repair.
• SENSOR 1 FAULT: Thermostat cannot read sensor wired to S1 and Com due to open/short circuit. Stops normal operation if Sensor 1 is the only active room/floor sensor or if a floor maximum temperature is set. Check sensor wire for short circuits. Error clears once corrected.
• SENSOR 2 FAULT: Thermostat cannot read sensor wired to S2 and Com due to open/short circuit. Stops normal operation if Sensor 2 is the only active room/floor sensor or if a floor maximum temperature is set. Check sensor wire for short circuits. Error clears once corrected.
• ROOM HOT WARNING: Room temperature exceeds the Room Hot Warning setting. Warning clears when temperature falls below the setting.
• ROOM COLD WARNING: Room temperature is below the Room Cold Warning setting. Warning clears when temperature rises above the setting.

Technical Data

WiFi Thermostat 561 One Stage Heat

• Literature: Submittal, Installation and Operating Manual, User Manual, Job Record, Watts Home Manual
• Control: Microprocessor control. Not a safety (limit) control.
• Packaged weight: 0.6 lb. (270 g)
• Dimensions: 4-5/8" H x 3" W x 15/16" D (118 x 76 x 24 mm)
• Enclosure: White PVC plastic, NEMA Type 1
• Approvals: Meets Class B: ICES & FCC Part 15
• Ambient conditions: Indoor use only, 32 to 122°F (0 to 50°C), RH ≤90% non-condensing
• Power supply: 15 to 30 V (ac/dc), 2 VA standby, Class 2
• Relays: 30 V (ac/dc), 2 A, Class 2 circuits
• Sensor: NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) β=3892
• Included: None
• Optional: tekmar type # 070, 072, 073, 076, 077, 079, 084
• Communications: WiFi 802.11n, 2.4 GHz, WPA2 encryption
• Mobile app: Apple iOS 12 or higher, Android 10 or higher

Warranty

The tekmar Limited Warranty is limited. The Purchaser acknowledges the terms of the Limited Warranty upon receipt of the Product and agrees to them. The warranty is a pass-through warranty from tekmar to the Purchaser, covering defects in workmanship and materials for twenty-four (24) months from the production date, or twelve (12) months from the documented installation date if installed within twenty-four (24) months of production.

tekmar's liability is limited to the cost of parts and labor for repair, exchange of the product, or credit limited to the original cost. tekmar is not responsible for other losses, costs, expenses, inconveniences, or damages arising from ownership or use of the product.

The pass-through Limited Warranty applies only to defective Products returned during the warranty period. It does not cover costs associated with removing, transporting, or reinstalling the defective Product.

Purchaser is responsible for any representations or warranties made to its customers that differ from or exceed the tekmar Limited Warranty. Purchaser shall indemnify tekmar against any claims, liabilities, or damages arising from such representations.

The Limited Warranty does not apply if the Product has been damaged by negligence, accident, fire, Act of God, abuse, misuse, unauthorized modifications, alterations, attachments, improper installation, or non-compliance with instructions or local codes.

THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ANY OTHER WARRANTY NOT EXCLUDED IS LIMITED TO TWENTY-FOUR (24) MONTHS FROM THE PRODUCTION DATE.

Product Warranty Return Procedure: Believed defective Products must be returned with a written description of the defect to the assigned tekmar Representative. Inquiries from non-representatives will be provided with the appropriate Representative's contact information.

Need help? Go to tekmarControls.com, contact tekmar.customerservice@wattswater.com, or call 1-800-438-3903.