Vent-Axia VAUFHTC Assembly instructions

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User Manual
1. Product description -Area of use. . . . . . . . . . . 2
2. Technical data. . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Explanations of the symbols in display . . . . . . 5
4. First time the thermostat is turned on. . . . . . . 5
5. Operation of the thermostat. . . . . . . . . . . . . . . 7
5.1. Constant temperature mode . . . . . . . . . 8
5.2. Event based mode. . . . . . . . . . . . . . . . . . 8
5.3. View measured sensor values. . . . . . . . . 11
6. Changing settings. . . . . . . . . . . . . . . . . . . . . . . . 11
6.1. System settings. . . . . . . . . . . . . . . . . . . . . 11
6.2. Sub-settings, parameters . . . . . . . . . . . . 12
6.3. Event mode settings . . . . . . . . . . . . . . . . 14
6.4. Setting the clock . . . . . . . . . . . . . . . . . . . 16
6.5. Setting the timer . . . . . . . . . . . . . . . . . . . 17
7. Error messages. . . . . . . . . . . . . . . . . . . . . . . . . . 18
8. Resetting the thermostat. . . . . . . . . . . . . . . . . . 18
Installation instructions
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1. PRODUCT DESCRIPTION – AREA OF USE
Thermostat for regulating underfloor electric heating cables,
temperature range within +5 to +40 °C (default). Ref 446174 is
programmable, and regulate the room or floor temperature
automatically. The thermostat can operate in two modes,
constant temperature mode or event mode.
From the factory Ref 446174 will start and run in constant
temperature mode using the room sensor (internal sensor) by
default. The temperature is set by the user, according to his/her
needs at any given time. If switched to event mode the
temperature target will be changed according to the default
program as shown in section 4. In event mode the thermostat
controls the temperature according to time and day. For
weekdays and weekend, different temperatures can be set at
different times. In this way it is possible to reduce the output
during night and day when the user does not need comfort
temperature (automatically). Energy consumption can be
reduced considerably. Please see section 6.3. for settings and
event mode programming.
The thermostat has a (built-in) room sensor and is delivered

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with an external sensor which should be placed (embedded)
into the floor between two heating cable loops, near the floor
surface. Temperature can be regulated by the floor sensor or
the room sensor. A combination mode is also available where
both sensors are used. The floor sensor can then be used to
limit the floor temperature (below the set maximum limit), the
room sensor is used for regulating temperature according to the
set value.
If the heat indication symbol is shown in the display, it means
the thermostat is heating, but the symbol is not directly linked
(synchronized) to the relay controlling the power to the heating
cable.
The thermostat is turned on and off by using the ON/OFF
button. When turned off the settings will be remembered. The
thermostat will also remember its' settings if the power supply
fails (no time limit, EEPROM backup).
2. TECHNICAL DATA
Rated voltage 220-240V
Own consumption < 2 W

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Maximum load 16A（approx. 3600W at rated voltage)
Switch (ON/OFF) Electronic
Temperature range From +5°C to +40°C
(+41°F to +104°F) (default)
Designed working
temperatures 1-50 °C (Room sensor)
for sensors 1-80 °C (Floor sensor)
Dimensions 84x84x40mm(25 mm socket)
Encapsulation IP 21
Length floor sensor
cable 3 m
Cross section area,
connecting wires 0,5 mm² - 2,5 mm²
Max. number of
heating cables 3
Sensing element NTC
Display LCD (blue backlighting)
The thermostat is maintenance free.

3. EXPLANATION OF SYMBOLS IN DISPLAY
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Clock (*)
Measured, or set
temperature if
“SET” is
shown.
Room sensor (*)
* These symbols are only shown if the function/state is active.
4. FIRST TIME THE THERMOSTAT IS TURNED ON
When the Ref 446174 is powered ON for the first time the
following will be shown in the display (heat indication shown
according to temperature level):
Floor sensor (*)
Heat indication
symbol.
Antifreeze (*)
Day of week (*)
Event/operation
mode symbols(*)
Timer (*) Shown when setting even
t
s/modes.
Shown when adjusting general settings
Shown if override
is active

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The thermostat is in constant temperature mode.
If switched to event mode the following predefined program
will start running:
MONDAY - FRIDAY:
Start time for normal operation
(morning) 06.00 Temperature 21°C
Start time for day saving
operation 09.00 Temperature 16°C
Start time for evening operation 17.00 Temperature 21°C
Start time for night saving
operation
22.00 Temperature 16°C

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SATURDAY - SUNDAY:
Start time for normal operation
(morning) 08.00 Temperature 21°C
Day saving operation(deactivated
by default) -- .-- Temperature -- °C
Evening operation(deactivated by
default)
-- .-- Temperature -- °C
Start time for night saving
operation
22.00 Temperature 16°C
For adjusting settings and other operational possibilities
please see section 5 and 6.
5. OPERATION OF THE THERMOSTAT
To change between constant temperature mode and event
mode
This function is linked to the clock function. Enter general
settings (See section 6.1) and go to sub-setting 11:CL (clock
settings). If the clock is disabled, the thermostat will run in
constant temperature mode. Event mode is activated by
activating the clock itself, either 12h AM/PM or 24h (See
section 6.1).

5.1. Constant temperature mode
The display will show the sensor in use and the temperature (or
the set temperature according to settings, see section 6.1 and
sub-setting 12:DF default display).
The set temperature can be adjusted by the user by pressing the
UP and DOWN buttons.
5.2. Event based mode
The temperature is regulated dependent of time and day (as set
by the user).
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In this mode the display will show the sensor in use, the clock,
the current event (in this case "evening operation"), the
temperature (or the set temperature according to settings, see
section 6.1 and sub-setting 12:DF default display), and the
present day (in this case Saturday).
In event mode of operation the thermostat regulates the
temperature according to four different events (the user can
define time and temperature for all four):
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For MONDAY to FRIDAY:
Normal operation (morning) From timeA to B
Day saving operation From time B to C
Evening operation From time C to D
night saving operation
evening operation
(the habitants return to the house)
day saving operation
(the habitants leave the house)
normal operation / morning