Herschel T-MT User manual

Select XLS
Herschel XLS Heating Controls
T-MT Mains powered Wifi thermostat
Installation and operating instructions
The product complies with European Safety Standards Low Voltage Directive 2014/35/EC, EMC
Directive 2014/30/EC, RED Directive 2014/53/EC, RoHS 2011/65/EC & Ecodesign requirements
for local space heaters 2009/125/EC.
Original instructions covering Herschel XLS controllers produced from 08/2019 onwards
Technical Information
Power Supply: Mains 120-240V or Micro USB
Installation: Wall-mounted using recessed back-box
(not supplied) or free-standing.
Setpoint Range: 5-40°C
Protection Class: IPX0
Wireless: 433Mhz (RF) and 2.4GHz (Wifi)
Wireless Range: 35m
Accuracy: +/- 0.5°C
Programming: 7 day program, 4 periods per day
Energy saving: Open Window, Adaptive Start
Smartlife App Control
Works with Alexa and Google Assistant
when paired with the Smartlife App
Warranty: 2 years
Certifications: CE, RoHS, EMC, RED, LOT20

T-MT Mains powered
wifi thermostat
T-MT Mains powered Wifi thermostat
Herschel T-MT is a mains or micro USB powered compact thermostat control
designed to work exclusively with Herschel XLS heaters with their built-in SMART-R
receiver.
T-MT also has Wifi capability to allow you to control your heating remotely via the
Smartlife App or by voice control using Alexa or Google Assistant.
T-MT features a manual temperature mode, a 7x1 day program mode and a holiday
(or Away) mode. All modes will operate your Herschel heater(s) by turning them
ON if the room temperature is lower than the desired temperature and will turn
them OFF once the desired temperature is reached or exceeded.
The T-MT is designed to be easy to operate and incorporates the latest energy-
saving features including Herschel’s open window technology and an adaptive start
function ensuring your room is always at the right temperature with the least
energy use.
The T-MT can be paired to more than one heater meaning multiple heaters within
the room can be controlled with the same T-MT thermostat.
Please read these instructions in conjunction with the Herschel XLS panel
instructions.
This appliance is rated IPX0 and must be installed outside of the splash zones in
bathrooms.
Display & Buttons 1. Day of week
2. Time
3. Temperature
4. Heating on symbol
5. Adaptive Start function enabled
6. Window Open function enabled
7. Operating Modes
8. Holiday (Away) Days remaining
9. Program number being run
10. Power On / Off
11. SET button
12. PRG Program button
13. Minus ‘-’ button
14. Plus ‘+’ button
15. Holiday Mode

T-MT Mains powered
wifi thermostat
Wall Mounting onto
Back box & mains power
1. Gently open the T-MT case using a flat-
headed screw driver.
2. The T-MT is a Class II electrical appliance
and does not require an Earth connection.
Please ensure when connecting the unit
to the mains, that any Earth wire is either
removed or insulated to prevent it
accidentally touching the live or neutral
terminals since this will damage the unit
and invalidate your warranty.
Ensure wiring clamps are fully opened
(unscrew anti-clockwise) before inserting
mains wires.
Place Brown Live mains wire into the
clamp marked “L” and the Blue Neutral
wire into the clamp marked “N” and
tighten both clamps securely.
IMPORTANT: Ensure mains power
is switched off before connecting
T-MT can be wall-mounted using mains power or free-standing using the
supplied micro USB plug
If possible, position the T-MT at least 2m away from the Herschel XLS heater.
3. Screw the rear casing of the T-MT onto the back box using bolts provided. When
positioning the rear of the casing on the wall, be sure to position the vents at
the bottom.
4. Place the front face of the T-MT over the rear casing and snap shut.
Free-standing using micro USB
1. Plug the supplied Micro USB adapter into the rear of the T-MT, attach to a USB
power source of adequate voltage (such as a 5v phone charger).

T-MT Mains powered
wifi thermostat
Pairing the T-MT with the Heater
1. Double press the Pairing button on the SMART-R box of the heater. The green
pairing status LED will start to flash and the heater is ready for pairing.
2. Ensure power is available to the T-MT, but that the power button on the unit is
switched off. “OF” is shown on the display.
3. Long-press the SET button on the T-MT and the word “PAIR” will flash on the
display.
4. When pairing has completed successfully, the green pairing status LED on the
SMART-R box will become a steady green and the word “PAIR” on the T-MT will
disappear.
5. You should not experience any difficulty in pairing, but in case you do, please
ensure the T-MT and Heater are within range of each other and try the above
process again.
6. Press the Power button on the T-MT to start using it to control the heater.
Operating Instructions
Managing your heating using your T-MT Controller
All the following steps can be performed using either the Smartlife App or the
controller keypad. However the Smartlife App makes the controller very simple and
convenient to operate. We recommend using the App to program the T-MT.If you
do not intend using the App, please jump ahead to the section “Controlling the T-MT
with its keypad”.
About the Smartlife App
The Smartlife App is constantly evolving and future versions may have some
differences to these printed instructions which were correct at time of printing. You
can always find the most up to date version of the instructions by checking the T-MT
controller product page on the Herschel website, where there is a link to the most
up to date instructions.

T-MT Mains powered
wifi thermostat
Scan the QR code below to download the Smartlife App from the App Store or
Google Play.
Alternatively, search “Smart Life” on Google Play or the App Store & look for this
icon.
Downloading & Installing the Smartlife App
After installing and opening the Smartlife App, you must register an account using an
email address and password and accept the terms of use.
To add your T-MT controller
Turn the T-MT off using the power button. Long-press PRG until the Wifi symbol
flashes.
Tap ‘+’ top right of App Select “Small Home Appliances”
and then “Thermostats”
If this is your first
thermostat you are adding
you will be asked to enter
your Wifi password.
You will not have to do
this when you add
subsequent thermostats
to the App.

T-MT Mains powered
wifi thermostat
Operations available on the App
From the main screen of the Smartlife app, you can
access management features also available from the
keypad of your T-MT:
- Power On / Off (turns off the T-MT and the
heater)
- Temperature override (Orange circle with + and –
buttons)
- Manual Operation
-“Smart” Operation (Program Mode)
- Holiday Mode
- Settings
- Controller Keypad lock
Give your T-MT a name
and access the main
screen.
Explanation of operating modes
Smart / PRG mode
Your Herschel Select XLS heater works most efficiently when it is set up to run
against a program controlled by the T-MT thermostat. This program will always
ensure your room reaches the temperature you want at the time you want it, each
day of the week. This is represented by the “Smart” function on the App, and by
the PRG function on the T-MT keypad. So usually you will want to set up and run
the unit in Smart / PRG mode. To enable Smart mode on the T-MT, touch the
“Smart” icon on the App main screen and alter the program settings in “Settings”.
Manual / MAN mode
Selecting Manual (MAN) mode allows you to set and maintain a constant
temperature that does not vary with the time of day. Once you set a temperature
using Manual mode, the T-MT will maintain this temperature until you give the T-
MT another command. Select Manual mode by touching the “Manual” icon on the
App main screen and alter the temperature up or down using the + and –buttons.

T-MT Mains powered
wifi thermostat
Override
You can always override the Programmed or Manual set temperatures to be higher
or lower by using the +or –keys on the App main screen or T-MT keypad to change
the temperature. When operating on Smart / PRG mode, the T-MT will maintain the
override temperature until the next programmed period (when the next
programmed temperature will be set). Under Manual mode, the override
temperature will remain set until you change it again manually.
Holiday Mode
There is also a Holiday (HOL) mode which allows you to save energy by setting a
lower temperature while you are away. The HOL mode has a day-counter feature
allowing you to set the number of days you are away and return the heating to
normal operation ahead of your return.
Select Holiday mode by touching the “Holiday” icon on the App main screen. Select
Days away using the slider and set your holiday temperature using the + or –
buttons. We recommend ending holiday mode at least one day before your return to
allow your house to warm back up again.
Other App functions
Settings
“Settings” on the App allow you to change:
- The Smart / PRG mode program schedules and temperatures;
- Temperature units (Centigrade or Fahrenheit);
- Calibration (Calibration is explained later in this manual);
- Adaptive start On or Off (Adaptive Start is explained later in this manual);
- Open Window Technology On or Off (Open Window is explained later in this
manual);
Keypad Lock
The “Lock” function on the App main screen locks the keypad of the T-MT so no one
can operate the controller from the device itself, until keypad lock is removed.
Device Details
You can alter other details about your T-MT including enabling Alexa or Google
Assistant or sharing control of your device with other members of your family by
tapping the pencil icon at the top right of the App main screen.
If you begin to use Smartlife to control other Home Automation devices, then you
can also integrate your T-MT control into other home automation tasks that you set
up in Smartlife from the Device Details screen.

T-MT Mains powered
wifi thermostat
Setting Time & Calibration
1. Press the SET button on the T-MT for 5
seconds to enter the settings mode. Day 1
of the week will begin to flash on the
display.
2. Use the +or - keys on the T-MT to set the
day of the week. (e.g. if 1is Monday and
today is Wednesday, press + until 3 flashes
in the display.)
3. Press SET again to advance to change the minutes and use the + or –keys again to
adjust.
4. Press SET again to advance to change the hour and use the + or –keys to adjust (it
is a24 hour clock).
5. Press SET again to Calibrate the temperature of the T-MT to match another
thermostat. Calibration is not usually necessary and we explain its use later. If
you need to Calibrate, perform this step here.
6. The T-MT automatically saves your changes as you enter them.
7. If you use the T-MT with the Smartlife App, your controller and phone will
automatically synchronise time and date settings, making this step unnecessary
using the Smartlife App.
Controlling the T-MT with its keypad
Selecting & Using Operating Modes
To select Manual (MAN) or Programming (PRG) modes, press the PRG button until the
mode you require is shown at the top of the display.
Manual Mode
Select the Manual mode by clicking the PRG button until MAN is shown on the display.
Use the +or –buttons to set the temperature you want the T-MT to maintain in the
room.
Note that the T-MT will maintain this temperature 24 x 7 until you switch to another
mode.

T-MT Mains powered
wifi thermostat
Programming the T-MT
To change the program defaults, proceed
as follows.
Set time & temperature for each day
Long-press PRG and the display will
change to enable input of the time and
temperature of the 4 periods for each day
of the week, starting with the first period
on day 1.
The Time will flash at the top left of the
display.
Holiday Mode
Holiday (Away) mode allows you to set a
cooler fallback temperature to maintain
in the house to save energy but avoid
frozen water pipes. The mode has a
countdown timer in which you can set up
to 99 days away, ensuring your normal
heating settings resume ahead of your
return, allowing you to come back to a
warm property.
Mon - Fri Sat - Sun
Period 1 06:30 21°C 08:00 21°C
Period 2 08:00 18°C 10:00 18°C
Period 3 18:00 21°C 18:00 21°C
Period 4 22:30 16°C 23:00 16°C
Program Mode
The T-MT comes with the following
program defaults which you can keep or
change.
Use + or –buttons to change the time. Press PRG to advance to the temperature
setting which will then flash.
Use + or –buttons to change the temperature.
Press PRG to advance to the next period.
Repeat the above steps to complete the 4 periods for each day. For 7 days of the
week this means a total of 28 programming steps.
After the final programming entry, the next click of PRG will return the unit to normal
operation.

T-MT Mains powered
wifi thermostat
To set the countdown timer, long press on the Holiday (Palm Tree) button on the key
pad. The “HOL” Mode is displayed and the days display will begin to flash.
Adjust the number of days you are away using + and –keys.
Press the Holiday button again to set the temperature to be maintained while you
are away.
Alter the temperature using the + and –keys.
Press the Holiday button again to save and exit. The days number will count down
daily until your entered number of days has elapsed and your thermostat will revert
to its previous mode and settings. We recommend ending holiday mode at least one
day before your return to allow your house to warm back up again.
To quit an active holiday mode, press the “PRG” button and select Manual or
program modes.
Open Window Function
If the T-MT detects a temperature drop of more than 3°C within 15 minutes, the
controller will power-off the heater. “OF” will appear on the screen and the text
“Alarm! Open Window!” will be displayed. Pressing the Power button on the unit will
resume normal operation, or waiting for 30 minutes will also restore normal
operation.
Open Window detection will only work if the feature is activated and shown as an
Open Window icon on the display (see display schematic on page 2). To activate the
Open Window function, press “SET” and ‘+’ together for 3 seconds. To deactivate the
Open Window function, repeat the process.
Adaptive Start
Adaptive start is an intelligent energy-saving feature which will turn on the heating in
advance of the next scheduled time if the current temperature is more than 5°C
below the next target temperature. (This avoids wasteful loads on the heater).
Adaptive Start will only work if the feature is activated and shown as a Timer icon on
the display (see display schematic on page 2). To activate the Adaptive Start feature,
press “SET” and ‘-’together for 3 seconds. To deactivate, repeat the process.
Keypad Lock
To activate the keypad lock, press SET and Holiday Mode buttons together for 3
seconds. A shut padlock icon will appear on the screen. Press SET and Holiday Mode
buttons together again for another 3 seconds to deactivate the keypad lock.

T-MT Mains powered
wifi thermostat
Calibration
Calibration is a process to alter the temperature of the T-MT up or down in order to
align the unit with another thermostat. The T-MT can be calibrated 5°Cup or down
from the default of 0 (no calibration).
Calibrating UP (i.e. +1 °C etc) means the T-MT will display a higher temperature than
the present one being shown. Use this when you think the T-MT is under-reading
compared with another thermostat.
Calibrating DOWN (i.e. - 1 °C etc) means the T-MT will display a lower temperature
than the present one being shown. Use this when you think the T-MT is over-reading
compared with another thermostat.
When adjusting the T-MT Time & Temperature settings using the SET button,
calibration is the final setting you can change. The default is 0. Use + or –keys to
adjust this figure up or down.
You can also change calibration using the Smartlife App.
2 Year Warranty
Register your product here https://www.herschel-
infrared.com/customer-service/warranty-registration/ or via the QR
code.
Within two years from date of purchase Herschel will repair or replace
the T-MT where the fault is due to defects in materials or
workmanship. This warranty is for standard domestic use only and
excludes commercial uses. In the event of a warranty claim please visit
the Customer Service area of the Herschel Website and follow the
Warranty Claim process. You will need proof of purchase.
Note your serial number here for future reference.
A prerequisite for validity of the warranty is use at the specified supply voltage of the thermostat
and use in accordance with the conditions specified in this manual. Any further warranty or claims
are excluded.
The warranty covers the repair of replacement of the defective product only and Herschel shall have
no liability for installation costs or consequential loses however incurred. The decision to repair or
replace will rest solely with Herschel and any replacement will be as close as possible in specification
to the failed unit.
Removing the serial number will void the warranty. The warranty will also be void if the unit has
been tampered with in any way.
The product rating label must be left on the unit. Herschel Infrared Ltd will assume no responsibility
for scratches on the thermostat display or case after first use.