Resol DeltaTherm HT User manual

DeltaTherm®HT
*11212709* 11212709
Thank you for buying this RESOL product.
Please read this manual carefully to get the best performance from this unit. Please keep this manual carefully.
Manual
en
Heating circuit controller for
heat interface units
Manual for the
specialised craftsman
Mounting
Connection
Operation
Troubleshooting
Application examples
beginning with version 1.0
www.resol.com

en
2
Subject to technical change. Errors excepted.
© 20180418_11212709_DeltaTherm_HT.monen_neu.indd
Safety advice
Please pay attention to the following safety advice in order to avoid danger and
damage to people and property.
Instructions
Attention must be paid to the valid local standards, regulations and directives!
Information about the product
Proper usage
The controller is designed for use in heating systems in compliance with the tech-
nical data specied in this manual.
Improper use excludes all liability claims.
CE-Declaration of conformity
The product complies with the relevant directives and is therefore la-
belled with the CE mark.The Declaration of Conformity is available upon
request, please contact RESOL.
Note:
Strong electromagnetic elds can impair the function of the device.
ÎMake sure the device as well as the system are not exposed to strong
electromagnetic elds.
Target group
These instructions are exclusively addressed to authorised skilled personnel.
Only qualied electricians should carry out electrical works.
Initial installation must be effected by the system owner or qualied personnel
named by the system owner.
Description of symbols
WARNING! Warnings are indicated with a warning triangle!
ÎThey contain information on how to avoid the danger
described.
Signal words describe the danger that may occur, when it is not avoided.
• WARNING means that injury, possibly life-threatening injury, can occur.
• ATTENTION means that damage to the appliance can occur.
Note:
Notes are indicated with an information symbol.
ÎArrows indicate instruction steps that should be carried out.
Disposal
• Dispose of the packaging in an environmentally sound manner.
• At the end of its working life,the product must not be disposed of as urban waste.
Old appliances must be disposed of by an authorised body in an environmentally
sound manner. Upon request we will take back your old appliances bought from
us and guarantee an environmentally sound disposal of the devices.

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The controller offers a compact and user-friendly solution for simple heating sys-
tems. It can control a weather-compensated heating circuit. Additionally, there’s a
choice of 5 different operating modes and a night correction. Due to the commis-
sioning menu, conguration is quick and easy. The chimney sweeper function and the
holiday mode can be activated by pressing a single button.
Contents
1 Overview........................................................................................................4
2 Installation.....................................................................................................5
2.1 Mounting....................................................................................................................................5
2.2 Electrical connection...............................................................................................................5
2.3 Data communication / Bus......................................................................................................6
2.4 MicroSD card slot....................................................................................................................6
3 Operation and function................................................................................7
3.1 Buttons and adjustment dial..................................................................................................7
3.2 Microbutton for chimney sweeper function/ screed drying and holiday mode.........7
3.3 Control lamp ............................................................................................................................7
4 Commissioning ...........................................................................................12
4.1 Basic settings.......................................................................................................................... 14
5 Functions and options ................................................................................15
5.1 Menu structure...................................................................................................................... 15
5.2 Status menu............................................................................................................................ 16
5.3 Heating.................................................................................................................................... 16
5.4 Meas./ Balance values ........................................................................................................... 16
5.5 Messages................................................................................................................................. 16
6 Heating ........................................................................................................17
6.1 Screed drying......................................................................................................................... 21
7 Basic settings...............................................................................................23
8 SD card .......................................................................................................23
9 Manual mode ..............................................................................................24
10 User code ....................................................................................................25
11 Troubleshooting ..........................................................................................25
12 Accessories..................................................................................................27
12.1 Sensors and measuring instruments................................................................................. 28
13 Index.............................................................................................................29
DeltaTherm®HT heating controller

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1 Overview
• Pre-congured basic system
• 4 relay outputs (incl. 1 extra-low voltage relay)
• 4 inputs for Pt1000 temperature sensors
• 5 operating modes, room thermostat and night correction
• Holiday mode, chimney sweeper function and screed drying function via microbuttons
• Data logging, storing, easy transfer of controller adjustments prepared and
rmware updates via SD card
• Weather-compensated control with room inuence or demand-based room
control with 1 room temperature sensor
• Remote access with a room control unit
• Function for using a central outdoor sensor unit
Technical data
Inputs: 4 inputs for Pt1000 temperature sensors (1 of them can be converted to
room thermostat (switch)), 1 input for remote control (RTA) or operating mode
switch (BAS)
Outputs: 3semiconductor relays, 1 potential-free extra-low voltage relay,
1 PWM output, 1 0-10 V output
PWM frequency: 512 Hz
PWM voltage: 10.8 V
Switching capacity:
1 (1) A 240 V~ (semiconductor relay)
1 (1) A 30 V⎓(potential-free relay)
Total switching capacity: 3 A 240 V~
Power supply: 100 … 240 V~ (50 … 60 Hz)
Supply connection: type Y attachment
Standby: 0.63W
Mode of operation: type 1.B.C.Y action
Rated impulse voltage: 2.5 kV
Data interface: VBus®, MicroSD card slot
Functions: weather-compensated heating circuit control, room thermostat, chim-
ney sweeper function, screed drying function, holiday mode
Housing: plastic, PC-ABS and PMMA
Mounting: wall mounting, also suitable for mounting into patch panels
Indication / Display: full graphic display, operating control LED (Lightwheel®)
Operation: 4 buttons and 1 adjustment dial (Lightwheel®)
Protection type: IP 20 / DIN EN 60529
Protection class: I
Ambient temperature: 0 … 40 °C
Degree of pollution: 2
Dimensions: 110 x 166 x 47 mm
110
166 130
47
Upper fastening
Lower fastening

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5
CommissioningSettingsTroubleshooting Data communication
2 Installation
2.1 Mounting
WARNING! Electric shock!
Upon opening the housing, live parts are exposed!
ÎAlways disconnect the controller from power supply be-
fore opening the housing!
Note:
Strong electromagnetic elds can impair the function of the device.
ÎMake sure the device as well as the system are not exposed to strong
electromagnetic elds.
The unit must only be located in dry interior rooms.
The controller must additionally be supplied from a double pole switch with contact
gap of at least 3 mm.
Please pay attention to separate routing of sensor cables and mains cables.
In order to mount the device to the wall, carry out the following steps:
ÎUnscrew the crosshead screw from the cover and remove it along with the
cover from the housing.
ÎMark the upper fastening point on the wall. Drill and fasten the enclosed wall
plug and screw leaving the head protruding.
ÎHang the housing from the upper fastening point and mark the lower fastening
point (centres 130 mm).
ÎInsert lower wall plug.
ÎFasten the housing to the wall with the lower fastening screw and tighten.
ÎCarry out the electrical wiring in accordance with the terminal allocation (see
page 5).
ÎPut the cover on the housing.
ÎAttach with the fastening screw.
2.2 Electrical connection
WARNING! Electric shock!
Upon opening the housing, live parts are exposed!
ÎAlways disconnect the controller from power supply
before opening the housing!
ATTENTION! ESD damage!
Electrostatic discharge can lead to damage to electronic components!
ÎTake care to discharge properly before touching the
inside of the device!To do so, touch a grounded sur-
face such as a radiator or tap!
Note:
Connecting the device to the power supply must always be the last step
of the installation!
Note:
The pump speed must be set to 100% when auxiliary relays or valves are
connected.
Note:
It must be possible to disconnect the device from the mains at any time.
ÎInstall the mains plug such that it is accessible at any time.
ÎIf this is not possible, install a switch that can be accessed.
Do not use the device if it is visibly damaged!
Depending on the product version, cables are already connected to the device. If
that is not the case, please proceed as follows:
The controller is equipped with 4 relays in total to which loads such as pumps,
valves, etc. can be connected:
Relays 1 … 3 are semiconductor relays, designed for pump speed control:
Conductor R1 … R3
Neutral conductor N (common terminal block)
Protective earth conductor ⏚(common terminal block)
Relay 4 is a potential-free extra-low voltage relay:
Connections to the R4 terminals can be made with either polarity.
Connect the temperature sensors (S1 to S4) to the terminals S1… S4 and GND
(either polarity).

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Installation Commissioning Settings Data communication Troubleshooting
potential-free extra-low
voltage relay
sensor terminals /
terminals for switch
and remote control
protective conductor
common terminal block (PE)
neutral conductor
common terminal block
PWM / 0-10 V
terminals
VBus®
The terminals marked PWM / 0-10V are control outputs for high-efciency pumps.
The controller is supplied with power via a mains cable. The power supply of the
device must be 100… 240 V~ (50… 60 Hz).
The mains connection is at the terminals:
Neutral conductor N
Conductor L
Protective earth conductor ⏚(common terminal block)
Note
For more details about the commissioning procedure see page 12.
2.3 Data communication / Bus
If a central outdoor sensor unit is used, connect it to the terminals marked
VBus with correct polarity.
Note
More accessories on page 27.
2.4 MicroSD card slot
The controller is equipped with a MicroSD card slot.
With a MicroSD card, the following functions can be carried out:
• Store measurement and balance values onto the MicroSD card.After the trans-
fer to a computer, the values can be opened and visualised, e. g. in a spreadsheet.
• Prepare adjustments and parameterisations on a computer and transfer them via
the MicroSD card.
• Store adjustments and parameterisations on the MicroSD card and, if necessary,
retrieve them from there.
• Download rmware updates from the Internet and install them on the controller
via MicroSD card.
MicroSD card slot
Note
For more information about using a MicroSD card, see page 23.
VBus
VBus
RTA / BAS
S4
/
S3
GND
Sensors
S2 S1
100 ... 240V
T4A
50-60 Hz
N
R3 R2 R1
L
R1-R3|1 (1) A 240 V~R4|1 (1) A 30V
IP 20
R4
PWM
0-10V
SD
R4
DeltaTherm® HT
Made in Germany
NN N N
R3 R2 R1 L
1234
56789
10 11
sensor ground common terminal block

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3 Operation and function
3.1 Buttons and adjustment dial
The controller is operated via 2 buttons and 1 adjustment dial (Lightwheel®) below
the display:
Left button (⟲) - escape button for changing into the previous menu
/ changing
to the home screen (Status Heating circuit), if the button is
pressed for 2s
Right button (✓) - conrming
/ selecting
Lightwheel®- scrolling upwards / scrolling downwards, increasing adjustment
values / reducing adjustment values
3.2 Microbutton for chimney sweeper function / screed drying and
holiday mode
The controller is equipped with two microbuttons for quick access to the holiday
mode and the chimney sweeper function / screed drying.The microbuttons are lo-
cated underneath the slidable housing cover, the slider.
Microbutton ♦: The chimney sweeper or screed drying function can be triggered
with the microbutton ♦.The chimney sweeper function is acti-
vated by default. In order to activate the screed drying function,
the chimney sweeper function must be deactivated (see page
20). In order to trigger the chimney sweeper or screed drying
function, press and hold down the microbutton ♦for 5 s.
Microbutton ⛁: Th e microbutton ⛁is used for activating the holiday mode. If the
microbutton is pressed and held down for approx. 3 s, the adjust-
ment channel Days of absence appears, allowing to enter the
number of days for an absence. If the parameter is set to a value
higher than 0, the holiday mode becomes active and the days will
be counted backwards at 00:00. If the value is set to 0, the holiday
mode is deactivated.
3.3 Control lamp
The controller is equipped with a multicolour LED in the centre of the Lightwheel®,
indicating the following states:
Colour Permanently shown Flashing
Green
Everything OK Manual mode on
Red
Screed drying
cancelled
Sensor line break, sensor short circuit, initialisation
Yellow
Holiday mode active Chimney sweeper function /screed drying active
Red /
Green
Manual mode off

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Installation Commissioning Settings Data communication Troubleshooting
If the symbol ⏩is shown behind a menu item, pressing the right button (✓) will
open a new submenu.
Values and adjustments can be changed in different ways:
Numeric values can be adjusted by means of a slide bar.The minimum value is indi-
cated to the left, the maximum value to the right.The large number above the slide
bar indicates the current adjustment.By turning the Lightwheel®, the upper slide bar
can be moved to the left or to the right.
Only after the adjustment has been conrmed by pressing the right button (✓) will
the number below the slide bar indicate the new value.The new value will be saved
if it is conrmed by pressing the right button (✓) again.
current value savedminimum value maximum value
adjusted value (not yet conrmed)
adjustment channel
When 2 values are locked against each other, they will display a reduced adjustment
range depending on the adjustment of the respective other value.
In this case, the active area of the slide bar is shortened, the inactive area is indicated
as a dotted line.The indication of the minimum and maximum values will adapt to
the reduction.
If only one item of several can be selected, they will be indicated with radio buttons.
When one item has been selected, the radio button in front of it is lled.
If more than one item of several can be selected, they will be indicated with check-
boxes.When an item has been selected, an xappears inside the checkbox.
If no button has been pressed within a couple of minutes, the adjustment is can-
celled and the previous value is retained.

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Adjusting the timer
When the Timer option is activated, a timer is in-
dicated in which time frames for the function can be
adjusted.
In the Day selection channel, the days of the week
are available individually and as frequently selected
combinations.
If more than one day or combination is selected, they
will be merged into one combination for the following
steps.
The last menu item after the list of days is Continue.
If Continue is selected, the
Edit timer menu opens, in
which the time frames can be adjusted.
Adding a time frame:
In order to add a time frame, proceed as follows:
ÎSelect New time frame.
The time frames can be adjusted in steps of 5 min.
ÎIn order to save the time frame, select Save and
conrm the safety enquiry with Ye s .
ÎIn order to add another time frame, repeat the
previous steps.
6 time frames can be adjusted per day or combination.
ÎPress the left button ⟲in order to get back to
the day selection.
ÎAdjust Start and Stop for the desired time frame.

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Installation Commissioning Settings Data communication Troubleshooting
Copying a time frame:
In order to copy time frames already adjusted into an-
other day /another combination, proceed as follows:
ÎChoose the day / The combination into which the
time frames are to be copied and select Copy
from.
A selection of days and / or combinations with time
frames will appear.
ÎSelect the day or combination from which the
time frames are to be copied.
All time frames adjusted for the selected day or com-
bination will be copied.
If the time frames copied are not changed, the day or
combination will be added to the combination from
which the time frames have been copied.
If the time frames copied are changed, the day / combi-
nation will be listed separately.
Changing a time frame:
In order to change a time frame, proceed as follows:
ÎSelect the time frame to be changed.
ÎMake the desired change.
ÎIn order to save the time frame, select Save and
conrm the safety enquiry with Ye s .
Removing a time frame:
In order to delete a time frame, proceed as follows:
ÎSelect the time frame that is to be deleted.
ÎSelect Delete and conrm the safety enquiry with
Ye s .

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Resetting the timer:
In order to reset time frames adjusted for a certain day
or combination, proceed as follows
ÎSelect the desired day or combination.
In order to reset the whole timer, proceed as follows:
ÎSelect Reset and conrm the safety enquiry with
Ye s .
The selected day or combination will disappear from
the list, all its time frames will be deleted
ÎSelect
Reset and conrm the safety enquiry with
Ye s .
All adjustments made for the timer are deleted.

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Installation Commissioning Settings Data communication Troubleshooting
4 Commissioning
When the hydraulic system is lled and ready for operation, connect the controller
to the mains.
The controller runs an initialisation phase in which the Lightwheel® ashes red.
When the controller is commissioned or when it is reset, it will run a commis-
sioning menu after the initialisation phase.The commissioning menu leads the user
through the most important adjustment channels needed for operating the system.
Disconnecting the controller from the power supply after having run the commis-
sioning menu will not delete adjustments that have already been carried out.After
you switch on the device again, the controller will not start the commissioning
menu, but normal operation after the initialisation phase.
Commissioning menu
The commissioning menu consists of the channels described in the following. In
order to make an adjustment, adjust the desired value with the Lightwheel®and
conrm with the right button (✓).The next channel will appear in the display.
Adjustment mode
Operation
Changing a value
Conrming a value
1. Language:
ÎAdjust the desired menu language.
2. Daylight savings time adjustment:
ÎActivate or deactivate the automatic daylight sav-
ings time adjustment.
3. Time:
ÎAdjust the clock time. First of all adjust the hours,
then the minutes.
4. Date:
ÎAdjust the date. First of all adjust the year, then the
month and then the day.
5. Central outdoor sensor unit
ÎActivate or deactivate respectively the central
outdoor sensor unit.

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6. Completing the commissioning menu:
After the selection, a security enquiry appears. If the
safety enquiry is conrmed, the adjustments are saved.
ÎIn order to conrm the security enquiry, press the
right button (✓).
ÎIn order to reenter the commissioning menu
channels, press the left button (⟲). If the secu-
rity enquiry has been conrmed, the controller is
ready for operation and should enable an opti-
mum system operation.
Note:
The adjustments carried out during commissioning can be changed any-
time in the corresponding adjustment channel. Additional functions and
options can also be activated or deactivated (see page 15).
Set the code to the customer code before handing over the con-
troller to the customer (see page 25).
Adjusting the operating mode:
After commissioning the heating circuit will be in automatic mode.The operating
mode can be changed in the status menu:
• Automatic
• Day
• Night
• Holiday
• Off

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Installation Commissioning Settings Data communication Troubleshooting
Sensors
S1 Outdoor 1 / GND
S2 Flow HC 2 / GND
S3 Return 3 / GND
S4 Room thermostat 4 / GND
S5 Remote control / operat-
ing mode switch
5 / GND
Relay
R1 HC pump R1 / N / PE
R2 Valve open R2 / N / PE
R3 Valve closed R3 / N / PE
R4 Free 8 / 10
By means of the ow sensor S2 and the outdoor temperature sensor S1, a mixed
weather-compensated heating circuit can be controlled.
4.1 Basic settings
The controller is preprogrammed for 1 basic system.The basic pre-adjustments
have already been made.
RE FL
heating network

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CommissioningSettingsTroubleshooting Data communication
Main menu
Status
Heating
Basic settings
SD card
Manual mode
User code
Heating circuit
Interval
Heat. sys.
Heating curve
Centr. outd. sen.
…
TFrost
Chimney sweeper
Heating
Heating circuit
Screed drying
The menu items and adjustment values selectable are variable depending
on adjustments already made. The gure only shows an exemplary excerpt
of the complete menu in order to visualise the menu structure.
Basic settings
Language
Auto DST
Time
…
Factory setting
5 Functions and options
5.1 Menu structure

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5.2 Status menu
The status menu contains information about the current state of the heating cir-
cuits. Furthermore, measured and balance values as well as messages are indicated.
5.3 Heating
In the Status / HC menu, the status of the heating circuit is indicated.The status
of the heating circuit is also the home screen of the controller. In this menu, the
operating mode of the heating circuit can be changed:
Automatic: Automatic heating mode.
Day: Constant heating mode with the adjusted day correction.
Night: Constant heating mode with the adjusted night correction and the selected
correction mode.
Holiday: Constant heating mode within an adjustable time frame with the adjusted
night correction and the selected correction mode.
Off: The heating circuit is switched off.The antifreeze function of the heating circuit
remains active.
5.4 Meas./ Balance values
In the Status / Meas./ Balance menu, all current measurement values as well as a
range of balance values are displayed. Some of the menu items can be selected in
order to enter a submenu.
Each sensor and relay is indicated with the component or function it has been allo-
cated to.The symbol ▶at the edge of the display next to a sensor allocated to a func-
tion, means that this sensor has several functions. Use the Lightwheel®to scroll to
these functions.The sensors and relays of the controller are listed in numerical order.
When a line with a measurement value is selected, another submenu will open.
If, for example, S1 is selected, a submenu indicating the minimum and maximum
values will open.
5.5 Messages
In the Status / Messages menu, error and warning messages which have not been
acknowledged are indicated.
During normal operation, the message Everything OK is indicated.
A short circuit (short-circuit) or line break (break) in a sensor line is indicated
as !Sensor fault.

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6 Heating
In this menu, all adjustments for the heating circuit can be made.
Additionally, the screed drying function can be activated and adjusted.
Heating circuit
The controller has one heating circuit. The following heating circuit variants are
possible:
• 1 mixed weather-compensated heating circuit
• 1 mixed constant heating circuit
If the measured ow temperature deviates from the set ow temperature, the valve
will be controlled in order to adjust the ow temperature correspondingly.
The control runtime can be adjusted with the parameter Interval.
The heating system Constant aims to keep the set ow temperature to a constant
value which can be adjusted by means of the parameter Set temperature.
If the heating system Curve is selected, the controller calculates a set ow temper-
ature by means of the outdoor temperature and the selected Heating curve. In
both cases, the dial setting of the remote control and the controller day correction
or night correction are added.
Heating system Constant:
Set ow temperature = set temperature + remote control + day correction or
night correction
Heating system Curve:
Set ow temperature = heating curve temperature + remote control + day correc-
tion or night correction
The calculated set ow temperature is limited by the adjusted values of the param-
eters Maximumowtemperature and Minimum owtemperature.
Flow maximum temperature ≥ set ow temperature ≥ow minimum temperature
The parameter Pump off is used for switching off the heating circuit pump, if the
adjusted value of the maximum ow temperature is exceeded by 5 K.
If the outdoor temperature sensor is defective, an error message will be indicated.
For the duration of this condition, 0 °C is assumed as the outdoor temperature.

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1,0
Flow temperature in °C
Outdoor temperature in °C
Flow set start value in °C at room factor = 10
Heating curves
20
30
40
60
50
70
Roominuence
If the heating system Constant is selected, the Roominuence option will be
available. The weather-compensated set ow temperature will thus be expanded by
a demand-based room control.
The parameter Room factor can be used for determining the intensity of the
room inuence.
Room factor < 10
If the room factor is < 10, the controller will calculate the set ow temperature
using the heating system Curve plus the room inuence:
Set ow temperature = set temperature + remote control + day correction or
night correction + room inuence.
Room factor = 10
If the room factor is equal to 10, the controller will calculate the set ow temper-
ature by means of the room inuence, the outdoor temperature will not be taken
into account.
An outdoor temperature sensor cannot be allocated.The parameters Day / Night
correction, Timer and TSummer will not be indicated.
The start value of the set ow temperature can be inuenced by the parameter
Heating curve. The start value corresponds to the set ow value of the selected
curve at an outdoor temperature of 0°C.
Set ow temperature = set ow start value + room inuence
In order to calculate the deviation of the room temperature from the adjusted
set value, a room thermostat is required. The adjustments can be made using the
parameter RTH. RTH is always pre-adjusted for the room inuence.
Room thermostat option
In order to integrate a room thermostat into the control logic without activating
the room inuence option, proceed as follows:
With the Room thermostat option, 1 room thermostat can be integrated into
the control logic.
A sensor input can be allocated to the room thermostat.The temperature at the
allocated sensor is monitored. If the measured temperature exceeds the adjusted
value TambSet at all activated room thermostats and if the parameter HC off is
activated, the heating circuit will switch off.

19
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A common room thermostat with a potential-free output can be used alternatively.
In this case, Switch must be selected in the Type channel.
When the Timer option is activated, a timer is indicated in which time frames for
the function can be adjusted. During these time frames, the adjusted room temper-
ature decreases by the Correction value.
Note:
For information on timer adjustment see 9.
Relay 4 is allocated to the room thermostat. The relay will switch on when the
temperature falls below the adjusted room temperature. This way, the room in
question can be excluded from the heating circuit via a valve as long as the desired
room temperature is reached.
With the parameter RTH, the room thermostat can be temporarily deactivated or
re-activated respectively.All adjustments remain stored.
The Return limit value option monitors the return temperature. If it exceeds
the value T-ret., the ow temperature will be decreased in order to avaid a too
high return temperature.The parameter Factor can be used for dening to which
extend the deviation may inuence the correction of the ow temperature. The
higher the factor, the higher the ow correction.
Correction timer
With the Timer, the day / night operation can be adjusted. During day phases, the
set ow temperature is increased by the adjusted Day correction value, during
night phases it is decreased by the Night correction value (night setback).
The parameter Mode is used for selecting between the following correction modes:
Day / night: A reduced set ow temperature (night correction) is used during night
operation.
Day / off: The heating circuit switches off during night operation.
Outdoor / off: The heating circuit switches off during night operation. If the tem-
perature falls below the adjusted limit temperature at the allocated outdoor tem-
perature sensor, the controller changes to the reduced heating mode.
The Timer HC parameter can be used for adjusting the time frames for day
operation.

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Summer mode
The automatic summer mode becomes active when the outdoor temperature
exceeds the adjusted summer temperature TSummer. This can be limited to a
daytime frame with the parameters Daytime on and Daytime off. Outside the
adjusted time frame, the lower temperature TNight is used in summer mode. In
summer mode, the heating circuit is switched off.
Remote access
The following types of remote access are possible:
Remote control: A device which allows manual adjustment of the heating curve,
thus inuencing the set ow temperature.
ÎIn order to use a remote control, set the Type to RTA
Room control unit: A device incorporating a remote control as well as an addi-
tional operating mode switch.
ÎIn order to use a room control unit, set the Type to BAS.
The operating mode switch of the room control unit is used for adjusting the op-
erating mode of the controller. If a room control unit is used, the operating mode
can be adjusted by means of the room control unit only.The controller menu only
allows the activation of the operating mode Holiday.
Antifreeze function
The antifreeze function of the heating circuit can be used to temporarily activate
an inactive heating circuit during sudden temperature drop in order to protect it
against frost damage.
The temperature at the allocated antifreeze sensor Sen. Frost is monitored. If the
temperature falls below the adjusted antifreeze temperature TFrost, the heating
circuit will be activated until the antifreeze temperature is exceeded by 2K, but at
least for 30 min.
Chimney sweeper function
The chimney sweeper function can be used for enabling quick access to measure-
ment conditions without having to navigate through the menu.
The chimney sweeper funtion is activated by default.The chimney sweeper mode
can be activated by pressing microbutton ♦for 3 s.
In the chimney sweeper mode, the valve opens, the heating circuit pump is acti-
vated. If the chimney sweeper function is active, the Lightwheel® ashes yellow.
Additionally, Chimney sweeper and a countdown of 30 min are indicated on the
display.
When the countdown has elapsed, the chimney sweeper mode is automatically de-
activated. If, during the countdown, microbutton ♦is again pressed for more than
3 s, the chimney sweeper mode will end.