Danfoss EFIT 550 User manual

EFIT 550
User Guide
and Installation Manual
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MAKING MODERN LIVING POSSIBLE
Danfoss Heating
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Thank you for buying a Danfoss product. With this purchase
you have obtained a product of the highest quality, designed
to give long lasting comfort at a minimum of environmental
impact.

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Contents
User Guide
1. Basics ................................................................................................4
1.1 Safety instructions.................................................................4
1.2 Functional overview .............................................................5
1.3 Temperature settings ..........................................................5
1.4 Changing Battery...................................................................6
1.5 Operating the child lock......................................................6
1.6 Switching the thermostat on and off .............................7
2. Advanced........................................................................................7
2.1 Optional Settings...................................................................8
2.2 Troubleshooting ................................................................. 11
2.3 Uninstalling Product.......................................................... 11
2.4 Specifications ....................................................................... 12
Installation manual ..............................................................
1.0 Installation overview ............................................................. 14
1.1 Safety instructions............................................................. 14
1.2 Installation guidelines...................................................... 14
2.0 System overview....................................................................... 15
2.1 Three different sensor configurations........................ 15
2.2 Network................................................................................. 16
3.0 Functional overview............................................................... 16
4.0 Installation - step by step..................................................... 17
4.1 Preparations and guidelines.......................................... 17
4.2 Dismantling the thermostat .......................................... 17
4.3 Connecting cables............................................................. 19
4.4 Mounting and reassembling the thermostat.......... 20
4.5 Activating the thermostat .............................................. 20
4.6 Configuring basic settings.............................................. 20
5.0 Optional settings..................................................................... 24
5.1 Network setup .................................................................... 24
6.0 Trouble-Shooting Diagram ................................................. 26
7.0 Factory Settings ....................................................................... 27
8.0 Warranty...................................................................................... 28

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1.0 Basics
The EFIT 550 thermostat controls electrical floor heating•
elements using a built-in and/or external temperature
sensor.
The EFIT 550’s adaptive function automatically optimises•
the unit for the room within a few days after installation
and continuously collects updated room data. This means
improved performance (with compensation for e.g. sudden
temperature drops in the room) and precise timing so the
selected temperature is achieved at exactly the right time.
The unit can be operated with or without the built-in timer.•
When the timer is used, the unit can automatically switch
between the set comfort temperature and economy tem-
perature at specific times of day. To use the timer, you must
first set the day and time and then set the timer.
1.1 Safety instructions
Do not cover the thermostat, e.g. by hanging towels or•
similar items in front of it! This will impair the unit’s ability
to sense and adjust the room temperature correctly.
This does not apply if the thermostat is configured to use a•
floor sensor only.
Do not spill liquids of any kind into the thermostat.•
Do not open, disassemble, or tamper with the thermostat•
in any way.
If the thermostat is installed in a place frequented by small•
children, use the child lock.
User guide

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1.2 Functional Overview
The thermostat is operated by using the button as follows:
Turning clockwise or counter-clockwise to raise or lower
values, e.g. when setting the temperature
Pressing briefly to activate or deactivate the timer or
confirm a setting during configuration
Pressing and holding for a number of seconds to access
various settings
User guide
Timer on
Frost
protection
on
Display
Hour display
Clock setting
active
Button
Child lock on
Temperature
below set
value
Degree symbol
Weekday
display
Timer setting
active

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User guide
1.3 Temperature Setting
Operation without timer:
The hour display appears as an unbroken ring with a blink-•
ing dot indicating the current time (if set).
Raise or lower the temperature.
The set temperature appears on the display.•
The system maintains the set temperature 24 hours a day.•
If the thermostat uses a floor sensor only, the display•
shows the set temperature on a scale from 1 to 10.
If you lower the temperature to +5 °C,• appears on the
display.
The thermostat maintains a temperature of +5 °C in the•
room for frost protection.
If you lower the temperature below +5 °C, the thermostat•
switches off.
“OFF” appears on the display.•
1.4 Changing Battery
The backup battery saves clock settings when the mains•
supply is off.
The battery recharges automatically when the mains sup-•
ply is on and does not normally need to be changed.

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User guide
1.5 Operating the child lock
Press and hold the button.
While holding, turn steadily counter-clockwise,
until “CODE” appears on the display.
Turn clockwise to select “0033”.
Press to confirm. appears on the display.
The child lock is on. The thermostat cannot be operated•
using the button except to switch off the child lock.
The child lock can be switched off using the same proce-•
dure as for switching it on.
1.6 Switching the thermostat on and off
The thermostat can only be switched off if the timer is off.
The thermostat is on by default.
If you lower the temperature below +5 °C, the
thermostat switches off. Turn vigorously counter-clock-
wise to achieve this. “OFF” appears on the display.
If you raise the temperature to +5 °C or above, the
thermostat switches on again.

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User guide
2.0 Advanced
2.0.1 Switching the timer on and off
The timer is switched on and off by pressing the button.
When the timer is on:
• appears on the display.
The hour display shows the set comfort temperature peri-•
ods for the current day as black segments of dots.
The current day is shown on the weekday display.•
The system automatically switches between comfort and•
economy temperatures at the preset times of day.
The economy temperature never appears on the alpha-•
numeric display. The display consistently shows the set
comfort temperature, even during economy tempera-
ture periods.
When the timer is off:
The hour display appears as an unbroken ring with a blink-•
ing dot indicating the current time (if set).
The system maintains the set temperature 24 hours a day.•
Note:
The thermostat can only be switched off if the timer is off.•

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User guide
2.1 Optional Settings
2.1.1 Setting the time and weekday
Press and hold for 3 seconds. appears on the display.
Set the correct time.
A small dot on the hour display shows the currently set•
time.
When the set time passes 0:00 in either direction, the•
weekday display changes to the next or previous day
(depending on which direction the button is being
turned).
Press to confirm. disappears from the display.
2.1.2 Setting the timer
Press and hold for 6 seconds. appears on the display.
You can now program when the system should switch•
from comfort temperature to economy temperature and
vice versa.

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User guide
Select the weekday where you want the program to
start.
Press to confirm.
Set the starting time of the first comfort temperature
period.
Press to confirm.
Set the duration of the first comfort temperature period.
The duration is shown as a segment of black dots on the•
hour display.
Press to confirm.