harmoni 25 User manual

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installation guide
digital timer thermostat
www.harmonithermostat.co.uk

installation guide
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Contents
Page
1 Introduction .............................................................. 3
2 Button and display description ................................ 4
3 Installing and wiring the thermostat ........................ 5
4 Basic functionality .................................................... 6
4.1
Select how to control your oor heating system ... 6
4.2 Recommended settings ...................................... 7
4.3 Setting the clock ................................................. 8
4.4 Setting the maximum oor temperature .............. 8
4.5 Reading the oor temperature ............................. 8
4.6 Frost protection mode ........................................ 9
5 Timer functionality .................................................... 10
5.1 Activating timer mode ......................................... 10
5.2 Programming the timer ....................................... 10
5.3 Programme your settings .................................... 10
6 Technical specications ........................................... 13
7 Disposal information & notes.................................... 14
8 Warranty ................................................................... 15

harmoni 25
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More information on this product can be found at:
www.harmoni-stat.co.uk
Introduction 1
harmoni 25 is an advanced digital timer thermostat used for
controlling electrical underoor heating elements.
The thermostat is designed for xed installation only. It can be
used to control your oor heating system by either the oor
temperature, the room temperature or both together.
Please note
The thermostat must be installed by an authorised
electrician.
In order to obtain the harmoni 2-year warranty, an
authorised electrician/installer must ll in the warranty
details (see page 15).

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Current oor
temperature
Current room
temperature
On/Off
Mode
Clock
Up
Down
Heating
element
warming
Frost protection
mode activated
Thermostat on
Day of the
week
Time mode
activated
Button & display description 2

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Installing & wiring the thermostat 3
To mount the thermostat to the wall
box/socket, open the thermostat
by gently pushing in the two tabs
at the bottom of the casing with a
screwdriver.
To x the thermostat, attach the
cables (see wiring diagram below)
and screw into the wall box/socket.
Once fastened and the cables
connected, reconnect the front
panel to the back.
Wiring diagram
Push in tabs
2
3
1
2
3
1

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Basic functionality 4
Power on/off
Press to turn the thermostat on or off
4.1 Select how to control your oor heating system
This can be controlled by pressing mode :
a) Floor temperature: Mode 2
The heating element turns on/off around a oor temperature
setpoint (the temperature shown in the display is the actual
oor temperature).
b) Room temperature: Modes 1 & 4
The heating element turns on/off around a room temperature
setpoint (the temperature shown in the display is the actual
room temperature).
c) Combined oor & room temperature: Modes 3 & 5
The heating element turns on/off around a room temperature
setpoint with a requested max. oor temperature (Note: oor
temperature is prioritized over room temperature).
Change between the above oor heating modes:
With the thermostat turned off.
Press and for 6 seconds
Select mode 1 to 5 (see table on next page for details)

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After choosing the desired mode do not press any further
buttons and the thermostat will go back to normal standby
mode.
4.2 Recommended settings
harmoni recommends the following settings for different types
of oor constructions:
Program mode Top flooring
Wooden floor* Tiled floor†
1(room sensor) If total effect: 0W–1840W 
2(floor sensor) If total effect: 0W–2990W  
3(combined room & floor sensor)
If total effect: 1840W–2990W  
4(room sensor)
If total effect: 1840W–2990W 
5(combined room & floor sensor)
If total effect: 0W–1840W  
* Top ooring made of materials such as: parquet, laminate,
massive wood, carpet or linoleum.
† Top ooring made of materials such as tiles, concrete or
marble.

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Basic functionality 4
4.3 Setting the clock
Press once and the hour will ash.
Use the (Up/Down key) to select the hours.
Press again until minutes ashes.
Use the (Up/Down key) to select the minutes.
Press button again until the week day ashes.
Use the (Up/Down key) to select the day of the week.
After setting the day, do not press any buttons and the
thermostat will go back to normal operating mode.
4.4 Setting the maximum oor temperature
This function is used mainly for wooden oors and is only
available in program modes using the oor sensor (modes 3
and 5)
The temperature setting should be maximum 35°C, which is
also the default set point of the thermostat.
If you choose to control the oor temperature solely by the
oor sensor (mode 2), the max. oor temperature is set for
35°C and cannot be changed.

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Change the oor temperature max. limit (mode 3 & 5)
Make sure the thermostat is turned off.
Hold the button for 10 seconds until the display shows
Release the button and the display will show SET
Enter the maximum oor temperature (range 20°C–45°C).
4.5 Reading the oor temperature (mode 3 & 5 only)
Make sure thermostat is turned on.
Press once, the FT will ash, and the display will show
the oor temperature.
In mode 2 (oor sensor) the display always shows the current
oor temperature.
In modes 1 & 4 (room sensor) the display always shows the
current room temperature.
4.6 Frost protection mode
To enable frost protection mode, turn off the thermostat.
Press for 3 seconds.
Select 01 (00 = disabled).
When frost protection has been enabled the display shows
When enabled and the thermostat is turned off, heating will
activate if the room/oor temperature is lower than 5°C; heating
will stop if the room/oor temperature is higher than 7°C.

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Timer functionality 5
5.1 Activating timer mode
With the thermostat turned on, press the button for 3
seconds. The following settings will be available:
00 = Override (disable timer functionality)
01 = Programmable. And the display will show .
Leave the thermostat and the display will return to normal.
5.2 Programming the timer (mode 1)
When programming you need to select Programmable
function (01) and the display must show (see above).
You can now set the heating programs. The thermostat must
have four heating periods for weekdays and four heating
periods for the weekend.
Please note: The programming of the whole calendar
week must take place in one continuous process, so it is a
good idea to have the periods written down for reference
when programming the thermostat.
For the weekend you will also need to program two
periods. You can choose one of the periods to be very
short or an extension of the other.

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Example, weekdays:
Period 1 starting at 07.00: Temperature setting 22°C
Period 2 starting at 08.30: Temperature setting 18°C
Period 3 starting at 17.00: Temperature setting 22°C
Period 4 starting at 23.00: Temperature setting 18°C
Example, weekend:
Period 1 starting at 09.00: Temperature setting 22°C
Period 2 starting at 23.00: Temperature setting 18°C
Period 3 starting at 23.01: Temperature setting 22°C
Period 4 starting at 23.02: Temperature setting 18°C
My settings:
Week days:
Period 1 start at ______________ Temp __________°C
Period 2 start at ______________ Temp __________°C
Period 3 start at ______________ Temp __________°C
Period 4 start at ______________ Temp __________°C
Weekend:
Period 1 start at ______________ Temp __________°C
Period 2 start at ______________ Temp __________°C
Period 3 start at ______________ Temp __________°C
Period 4 start at ______________ Temp __________°C

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Timer functionality 5
5.3 Programme your settings
Press the for 3 seconds until the number “1” and
“Mo Tu We Th Fr” are displayed.
The rst switching time for weekdays can now be programmed.
Use (Up/Down key) to set the required start time.
Press to conrm this setting.
Use the (Up/Down key) to set the required temperature.
Press to conrm this setting.
Repeat the switching time process for weekdays 2,3 & 4.
After you have programmed times 1–4 for the weekday, you
can set the switching times for the weekends; “Sa Su” will be
displayed.
Use (Up/Down key) to set the required start time.
Press to accept this setting.
Use the (Up/Down key) to set the required temperature.
Repeat the switching time process for weekends 2,3 & 4.
To disable the timer, select “Override” (Mode 01).

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Technical specications 6
External sensor NTC 10 kOhm at 25° C
Sensor values:
15°C
18°C
20°C
22°C
14.8 kOhm
13.1 kOhm
12.1 kOhm
11.2 kOhm
Display LCD
Power consumption <2W
Set-point range Room: 5°C to 35°C
Floor: 20°C to 35/45°C
Accuracy ±1°C
Buttons Touch pad
Switch current rating <13A (resistive load)
Mains voltage 85–240V~
Dimensions 86 × 86 × 13mm (W×H×D)
Fixing screw width 60mm
Housing ABS + PC Flame Retardant
Operating rating 0~30°C, 5~95% RH (non-condensing)
SW class A
Ball pressure test 100°C
Pollution degree 2
Weight 253 g

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Disposal information 7
Notes

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harmoni warranty 8
Name .....................................................................................
Address .................................................................................
...............................................................................................
County......................................... Postcode............................
Address .................................................................................
Phone .....................................................................................
Email .....................................................................................
Please note
In order to obtain the harmoni 2-year warranty, an
authorised electrician/installer must ll in the details below.
Electrician Installation
/Installer ............................................ date ..........................
Thermostat Article
name ................................................ number .....................
Stamp:

16
installation guide
harmoni
Edison House
Edison Close
Ransomes Europark
Ipswich
Suffolk IP3 9GU
United Kingdom
T: 01473 559088
F: 01473 276678
E: [e-mail]
www.harmonithermostat.co.uk
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reserves the right to alter its products without notice. This also applies to products already on order provided that
such alterations can be made without subsequent changes to specifications already agreed. All trademarks in this
material are the property of harmoni. harmoni and the harmoni logotype are trademarks of Edison House Ltd. All
rights reserved.