Stelpro Maestro SMT402 User manual

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USER GUIDE
SMART THERMOSTAT
Model: SMT402
INS-SMT402-EN-040618

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TABLE OF CONTENTS
COMPATIBILITY 3
WHAT’S IN THE BOX AND TOOLS REQUIRED 3
WARNING 4
Where to install your MAESTRO controller
•thermostat 5
Read this guide and watch the installation video 5
INSTALLING THE MAESTRO THERMOSTAT 6
1Cut off power supply 6
2Remove existing thermostat 7
3Secure the MAESTRO thermostat mounting plate 8
4Connect the wires 9
5Secure the thermostat on the mounting plate 10
6Turn power back on 11
7 Set-up basic options on rst start 12
USING THE THERMOSTAT 13
Thermostat interface 13
Navigating the advanced menus 14
Advanced menus 14
Navigating the °STELPRO menu 15
Setting the heating mode 15
Connecting a thermostat to the MAESTRO controller
•thermostat 16
With the MAESTRO app 16
Without the MAESTRO app 17
Connecting the thermostat to another Zigbee network 18
Setting the temperature setpoint 18
Displaying ambient relative humidity or outdoor temperature 19
Choosing the temperature display unit (°C or °F) 19
Locking or unlocking the keypad 19
Activating or deactivating open window detection 20
Activating or deactivated proximity detection 20
Resetting the thermostat 20
THE 360° COMFORT EXPERIENCE 21
Make the most of your MAESTRO 21
Control your comfort from wherever you are 21
Group rooms 21
Create personalized activities 21
Anticipated start 21
Geofencing: comfort follows you wherever you go 21
Track your energy consumption 21
THERMOSTAT TROUBLESHOOTING 22
Common problems 22
THERMOSTAT DEFAULT VALUES 24
TECHNICAL SPECIFICATIONS 25
Electrical data 25
Temperature display 25
Connectivity 25
Storage and operating conditions 25
WARRANTY 26

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• MAESTRO thermostat
• Mounting plate
• Mounting screws (2)
• Caps (2)
• Quickstart guide
• Warning
WHAT’S IN THE BOX AND TOOLS REQUIRED
COMPATIBILITY
Your MAESTRO controller • thermostat can control electric baseboards, convectors and fan-forced heaters.
IMPORTANT: This thermostat is not compatible with:
• Systems with inductive loads
• Central heating systems
• Systems with resistive loads that are:
o inferior to 150 W at 120 VAC / 260 W at 208 VAC / 300 W at 240 VAC
o superior to 2000 W at 120 VAC / 3400 W at 208 VAC / 4000 W at 240 VAC
See page 25 for detailed technical specications of the MAESTRO thermostat.
To install your thermostat, you will need:
• No. 2 Phillips screwdriver
The two required screws are supplied.

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Before installing and operating this thermostat, the owner and/or installer must read, understand and follow these instructions
and keep them handy for future reference. If these instructions are not followed, the warranty will be considered null and void
and the manufacturer deems no further responsibility for this product. Moreover, the following instructions must be adhered
to in order to avoid personal injuries or property damages, serious injuries and potentially fatal electric shocks. All electric
connections must be made by a qualied electrician, according to the electric and building codes effective in your region.
• Do NOT connect this product to a supply source other than 120 VAC or 240 VAC, and do not exceed the load limits
specied.
• Protect the heating system with the appropriate circuit breaker or fuse. You must regularly clean dirt accumulations on the
thermostat.
• Do NOT use uid to clean thermostat air vents.
• Do NOT install thermostat in a wet place or on an external wall. However, installing it in isolated walls is allowed. To avoid
any risk of overheating, leave a clearance of at least 30 cm (12 in.) around the thermostat to ensure proper ventilation.
• Also, make sure that the air vents at the bottom and top of the thermostat housing are clear of any obstruction: blocked
air vents can lead to the unit overheating and affect its operation.
NOTE: °STELPRO reserves the right to modify its product without notice to improve operability. Therefore, the instructions in
this user guide many not entirely match all the functions of your thermostat. To obtain the most recent documentation, visit
the °STELPRO website.
IMPORTANT: HIGH VOLTAGE! CUT OFF POWER BEFORE INSTALLING UNIT OR DOING ANY MAINTENANCE.
WARNING

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WHERE TO INSTALL YOUR MAESTRO CONTROLLER•THERMOSTAT
Install a MAESTRO thermostat in each room where you want to control the temperature.
You must install the thermostat at approximately 1.5 m (5 ft.) from the oor, on an
indoor wall that faces the heating system. The thermostat must be mounted on an
electrical box.
ATTENTION : To avoid any risk of overheating, leave a clearance of at least 30 cm
(12 in.) around the thermostat to ensure proper ventilation. Also, the front of the
unit should be completely clear of any obstruction to ensure optimal functionality.
For example, do not install the thermostat behind curtains or furniture.
To avoid getting false temperature measurements, do not install the thermostat in
any of the following locations:
• Near a window or close to a door leading outside
• In an area exposed directly to the light or heat of the sun, a lamp, a replace or any other heat source
• Near an air outlet
• Near concealed ducts or a chimney
• Where there is poor air ow (e.g. behind a door)
• Where there is a high concentration of dust
• Where there are frequent air drafts (e.g. top of stairs)
READ THIS GUIDE AND WATCH THE INSTALLATION VIDEO
Before you start, take a few minutes to carefully read this guide and watch the step-by-step video on installing the MAESTRO
thermostat. It will ensure safe and easy installation.
The installation video is at the bottom of this page: www.stelpro.com/en-CA/maestro

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1CUT OFF POWER SUPPLY
To avoid any risk of electric shock, cut off the power supply on the lead wires from the electrical panel. Make sure the
power is off by checking, for example, that the heating system remains off even if the setpoint temperature is higher
than the ambient temperature (mechanical thermostat).
INSTALLING THE MAESTRO THERMOSTAT
INSTALLATION OF THE THERMOSTAT MUST BE DONE BY A QUALIFIED ELECTRICIAN.
IMPORTANT

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2REMOVE EXISTING THERMOSTAT
If an existing thermostat is being replaced, remove it and disconnect its wires from the heating system and power
supply.
NOTE: These instructions apply to a thermostat with a °STELPRO mounting plate.
1 - Loosen the screw at the base of the thermostat, without completely removing it, to separate the thermostat from the
mounting plate.
2 - Gently pull the thermostat to gain access to the wires.
3 - Disconnect the thermostat wires from those of the heating sys-
tem and power supply.
4 - Remove the mounting plate.

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3SECURE THE MAESTRO THERMOSTAT MOUNTING PLATE
Secure the MAESTRO thermostat mounting plate to the electrical box using the screws supplied.
1 - Loosen the screw at the base of the MAESTRO thermostat, without completely removing it, until the thermostat and
the mounting plate are no longer holding together.
2 - Slide the mounting plate downward and then pull on it to separate it from the thermostat.
3 - Using the mounting screws supplied (2), secure the MAESTRO thermostat mounting plate to the electrical box. Ensure
the plate is perfectly straight so that the thermostat is also straight.
4 - Pass the power supply wires through the large opening at the centre of the mounting plate.
NOTE: You can position the mounting plate
either to the left, in the centre or to the right
of the electrical box, according to your needs.
(See image below).

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4CONNECT THE WIRES
Using the caps supplied (2), connect the wires of the MAESTRO thermostat to those of the heating system and
power supply according to the corresponding connection diagram (2 or 4 wires). Tighten the caps onto the wires to
ensure the connection is secure. Then place all the wires inside the electrical box.
NOTE: If the electrical wires are aluminum, use
CO/ALR connectors instead (not supplied).
NOTE: Since thermostat wires do not have polarity,
the way they are connected is not important.
2-Wire intallation
4-Wire installation
IMPROPER WIRING IS
A FIRE HAZARD.
IMPORTANT

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5SECURE THE THERMOSTAT ON THE MOUNTING PLATE
Align and secure the thermostat on the mounting plate.
1 - Ensure the air vents in the thermostat are clean and clear of any obstruction.
2 - Align the slot on the top of the thermostat with the slot on the mounting plate.
3 - Then secure the thermostat to the mounting plate making sure that the wires do not get pinched between the unit
and the mounting plate.
4 - Tighten the screw at the base of the thermostat to secure it in place.