Herschel MD2 User manual

MD2 Wired Thermostat
MD2 Wifi enabled
wired thermostat
The Herschel iQ MD2 is a 16 amp thermostat enabling
up to 3.6 kW of Herschel Heaters to be connected
through a single, easy to use control. MD2 is wired
directly to the mains circuit powering the heaters. Built-in
wifi enables control via the internet using the SmartLife
App.
MD2 is easy to operate and incorporates Herschel’s open
window technology to save energy. MD2 has a
keypad locking feature to prevent unauthorised
tampering with the settings and it can be programmed to
control zones up to 45°C, making it suitable for
commercial use and for specialist high temperature
applications such as hot yoga studios.
MD2 features Manual, Eco and 7 day programming
modes with 4 periods per day. The MD2 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.
Please read these instructions carefully. MD2 operates
stand-alone, but can be paired to the SmartLife App if
internet operation is required.
Key features
• Mains operated
• Easy to use large LCD display
• Wall installation
• 7 x 1 day programmable, 4 periods per day
• Manual, Eco and 7 Day Programme modes
• Open window function
• 5°C - 45°C operation
• Keypad Lock
• Wireless 2.4GHz wifi
• CE, Rohs, RED approved
• 24 month warranty
The MD2 will require a single gang 46mm deep
pattress box for recessing into a wall, with access
to the mains circuit powering the heaters. Position
far enough away from the Herschel infrared heaters
to allow it to sense an average room temperature.

MD2 WIRED THERMOSTAT
Displays & Buttons
After installing and opening the SmartLife App, you must register an account using an email address and
password and accept the terms of use.
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.
Operation using the SmartLife App
The MD2 can be used stand-alone or with the SmartLife App. Since SmartLife makes management of your
MD2 so easy, we start with this first. But if you only want to use MD2 stand-alone, please go direct to the
“Stand-alone Operation”section below.
Downloading & Installing the SmartLife App

MD2 WIRED THERMOSTAT
To add your MD2 controller
Your mobile phone or tablet must be connected to the main 2.4GHz wifi signal issued by your router. Being
connected to a 5GHz signal or a network extender will cause the pairing process to fail.
•In the Smartlife App home page, add a device by pressing the + button in the top right corner.
•Select “Small Home Appliances”
•Select “Thermostats”on the list.
•Turn the MD2 on. Long press the power button to enter wifi connection mode.
•Tap the icon and the wifi status symbol will begin to flash.
•In the SmartLife app, confirm the prompt: “confirm the indicator is rapidly blinking”.
•Pairing is complete when the Thermostat appears in the Smartlife App and the Wifi Status symbol on
the MD2 is no longer blinking (shows a solid connection). Please note it may take up to a minute for the
Controller to stop flashing after it appears to have paired successfully in the Smartflife App.
•Tap the Thermostat in the app to start managing it.
Give your thermostat a meaningful name by clicking on the
pencil icon to the right of the title. This is especially important
if you are adding several thermostats as it is easy to lose track
of which controller is which without a meaningful name.
From the main screen of the Smartlife app, you can access
management features of the MD2:
- Switch (turns On or OFF the MD2 and the heater)
- Setpoint + and - buttons override current temperature
setpoint.
- Mode - Selection of Manual, Eco and Program Modes.
- Settings. These include the keypad (Child) lock & the weekly
program schedule. The app shows a countdown timer
available, but this is a generic provision of the app and is not
a function of the MD2. It only turns the MD2 on or off.

MD2 WIRED THERMOSTAT
Stand-alone Operation using MD2 keypad
Time and Day setting
•Turn MD2 on.
•Press for 3 seconds until the minutes display flashes. Press or to change the
value (each press = 1 minute).
•Press the button again to change the hour display. Press or to change the
value (each press = 1 hour). This is a 24 hour clock.
•Press the button again to change the day. Press or to select the day (1-7 for
Monday – Sunday so e.g. Friday is 5).
Mode selection & settings
The MD2 has 3 temperature modes: Manual (Constant); Eco and Program modes.
•Press to select mode.
The Eco mode is displayed as a symbol (top left of display). Eco Mode is a lower-than-normal
temperature setting that you can apply to save energy (e.g. on holiday) or as a frost-protection setting. This
setting can also be manually overridden.
Program mode is displayed as (the number denotes which period of the day is active). Any manual
override in program mode remains in effect only until the next period.
Manual Mode is displayed as a symbol (top left of display). Manual mode allows you to set whatever
temperature you require and this will be maintained until you change it or until another mode is selected.
To Set Eco Mode Temperature:
In Eco mode, press and to set the desired setpoint temperature. The temperature will
flash while it is saved and then return to a steady display of current room temperature.
To select a mode at any time, press the button and choose your required mode. The selection will
override the program schedule or current temperature setpoint until another mode is selected.

MD2 WIRED THERMOSTAT
Program Mode
The MD2 has a 7 x 1 day timer (Monday to Sunday) with 4 periods per day. For example, you could choose
Period 1 to be the temperature you wake-up to; Period 2 the daytime set-back temperature; Period 3 the late
afternoon / early evening temperature and Period 4 the nighttime setback temperature.
Unlike conventional heating, Herschel Far infrared directly heats the room (the “Thermal Mass”). For areas in
frequent use it is more economical to avoid temperatures dropping too low as the heater will need to be on for
a much longer period to restore temperatures. We recommend overnight setback temperatures of no lower
than 14°C and daytime temperatures of 16°C and above. Always try to program the schedule so a room is at
the temperature you want by the time you want. For example if you want it to be 21°C by 0700 am, consider
starting the program at 0600 a.m.
To set the 7 days program
•Press for 3 seconds to start the 7 x 1 day program setting. The First period of the First day is
selected.
•Press or to set the time of the first period of the day’s program.
•Press and to select the desired temperature setpoint.
•Press again to proceed to the next period.
•Repeat the above procedure for each period of each day.
The default settings you will receive with your MD2 are as follows:
To select Program Mode press until is displayed as the mode.
The schedule will then operate until another mode is selected.
All Days
Period 1
0630 21℃
Period 2
0800 18℃
Period 3
18:00 21℃
Period 4
22:30 16℃

MD2 WIRED THERMOSTAT
Temperature can always be overridden manually by pressing the and buttons. The
temperature will remain at this setting until the next programmed change occurs.
For example, using the above table, if it was 18:00 on a Monday, the thermostat would be set to 21°C. If you
wished to increase the temperature to 22°C, press to increase temperature to 22°C. The
thermostat would then retain this setting until 22:30 when the period 4 schedule would reduce the set
temperature to 16°C.
Keypad Lock
The Keypad Lock function can be selected On or Off in the parameter settings (see Parameter Settings below).
It is Off by default. Keypad lock is indicated by a Padlock at the top left of the display.
You can press for 5 seconds to unlock the keypad for a temporary adjustment. The keypad will
lock again once the backlight on the display switches off.
Window Open Detect
When temperatures are above 14°C if the system detects a drop of 2°C in a 15 minute period, the heating will
automatically be stopped (if it is on). The letters OP will display instead of the temperature display. The MD2
will return to the previous mode of operation after 60 minutes and the current room temperature will replace
the letters OP once again. Pressing any button during the 60 minute period will exit the Open Window function
and resume previous operations.
Window Open is set OFF by default when you receive the MD2. In Parameter Settings, you can enable the
Window Open Detect function; change the temperature drop detected; change the period within which the
drop is detected and change the period the heater remains off. See Parameter Settings.

MD2 WIRED THERMOSTAT
Parameter Settings
With the MD2 turned Off, press the location of the button for 5 seconds to enter the parameter
setting.
Each press of the button will select the next available parameter. Pressing and
will change the individual parameter. Press to save and exit.
Item
Description
Range
Default Value
01
Temp. calibration
-8°C - 8°C
0°C
02
Max Temp setpoint
5°C - 45°C
35°C
03
Min Temp setpoint
5°C - 45°C
5°C
04
Sensor select
0 Room only
1 External only
2 Room + External
0 (Room only)
05
Frost Protection Temp.
5°C - 15°C
5°C
06
Temp Calibration for external sensor
-8°C - 8°C
0°C
07
Temp detection by external sensor
Read Only
08
Overheat protection setting
20°C - 80°C
32°C
09
Dead Zone
0 - 3°C
0°C
11
Keypad Lock
1: Lock 0: Unlock
0 (Unlock)
12
Open Window Detect
1: ON 0: OFF
0 (OFF)
13
OW Detect Time
2 – 30 mins
15 mins
14
OW drop temp
2, 3 or 4°C
2°C
15
OW Stop Time
10 – 60 mins
30 mins
17
Factory Reset
0: No 1: Yes
(To reset, select 1, then
turn the unit off and on
again)
0

MD2 WIRED THERMOSTAT
Dimensions (mm)
The MD2 is 86mm x 86mm and the front display is 16.5mm thick. A single gang pattress box 46mm deep is
required for mounting, and mounting holes are 60mm apart.
Wiring
Wiring the MD2 should be carried out by a qualified
electrician. Ensure power supply to the MD2 is turned
OFF before wiring or unwiring the MD2. Maximum
load is 16A / 3.6kw at 230v.
The MD2 can be used to control several Herschel
heaters but the maximum wattage of 3.6kw (3,680w)
must not be exceeded. Do not use for any other
non-Herschel heating devices. INDOOR USE ONLY.
Wire mains Live to terminal 1, Neutral to terminal 2 and Earth to terminal 5. Wire the load to heater: Live to
terminal 3, Neutral to terminal 4 and earth to terminal 5.

MD2 WIRED THERMOSTAT
Installation
Technical Information:
Frequency Wifi 2.4 Ghz
Power Supply 110 - 230VAC, 50/60Hz
Set Point Range 5~45℃
Ambient 0~50℃
Relative Humidity 85%
Backlight White
Sensor NTC 10K
3950ohms at 25℃
Accuracy ± 0.5℃ (step control by +0.5℃)
Protection Class IP30
Housing ABS to UL94-5
fire retardant plastic
Certifications:
EN60950 Information Equipment Safety
EMC ETSI EN301 489
Radio ETSI EN300220
EMC EN61000-6-3: 2007 + A1: 2011 EMC EN61000-3-
2:2014
EMC EN61000-3-3: 2013
EMC EN61000-6-1:2007
ISO 9001: 2008 Compliant Manufacture EN60730-2-
9:2010 with EN60730-1:2011
(Safety of Automatic Electrical Controls)
RoHS 2011/65/EC
REACH 1907/2006/EC