Robur CSK18 User manual

System controller
User manual
for modulating gas-absorption condensing heat pump +
renewable aerothermal energy K18

Revision: A
Code: D-LBR850
This User manual has been drawn up and printed by Robur S.p.A.; whole or partial reproduction of this User manual is prohibited.
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User manual without prior notice.

User manual – System controller 3
I Introduction............................................................................. p.4
I.1 Recipients .......................................................................... p.4
I.2 References ......................................................................... p.4
II Symbols and denitions............................................... p.4
II.1 Key to symbols................................................................. p.4
II.2 Terms and denitions.................................................... p.4
III Warnings...................................................................................... p.4
III.1 Safety................................................................................... p.4
1 General information......................................................... p.5
2 User instructions: QAA74.611 advanced
room unit.............................................................................................. p.5
2.1 Description........................................................................ p.5
2.2 Display elements and relative function .................. p.5
2.3 Selecting the heating mode ....................................... p.7
2.4 Change room temperature setpoint........................ p.8
2.5 Heating time programs................................................. p.8
2.6 Warmer/Cooler function .............................................. p.9
2.7 Selecting the DHW mode .......................................... p.10
2.8 Change DHW setpoint ................................................ p.10
2.9 DHW time program...................................................... p.11
2.10 DHW forced charging function................................ p.11
2.11 Legionella protection .................................................. p.11
2.12 Plant/zone switch ......................................................... p.12
2.13 Information display...................................................... p.12
3 User instructions: QAA55.110 basic room
unit........................................................................................................... p.13
3.1 Legend of commands ................................................. p.13
3.2 Display symbols............................................................. p.13
3.3 Selecting the heating mode ..................................... p.14
3.4 Change room temperature setpoint...................... p.14
3.5 Occupancy button........................................................ p.14
4 Other settings....................................................................... p.14
4.1 Date and time................................................................. p.15
4.2 Start and end of daylight saving time................... p.15
4.3 Language......................................................................... p.15
4.4 Heating zone settings ................................................. p.15
5 Errors............................................................................................. p.17
5.1 Error list............................................................................. p.17
5.2 System controller error handling ............................ p.18
5.3 K18 error handling........................................................ p.18
INDEX OF CONTENTS

Introduction
4
I
I INTRODUCTION
User manual
This "User manual" is a guide to the use and congura-
tion of the K18 System controller. The System controller
consists of an electrical enclosure (CSK18), generally in-
stalled in a machine room, with an included room unit,
and at most two other optional room units which can be
added to improve comfort control when the heating sys-
tem consists of two or three separate heating circuits, or
two or three zone valves.
This manual assumes that you are familiar with the
products Robur and information contained in the equip-
ment's respective installation, user and maintenance
manuals.
I.1 RECIPIENTS
This manual is specically intended for:
▶ End users, for the operation of the appliance according to
their own requirements.
▶ Installers of the water and electrical circuits, as a supplement
to the K18 System controller installation manual (and the
KECSK18 System controller expansion kit installation manu-
al, if applicable).
I.2 REFERENCES
Further information can be found in the following documents:
K18 System controller installation manual.
KECSK18 System controller for K18 expansion kit instal-
lation manual.
Installation, use and maintenance manual of the specic
K18 unit model used.
II SYMBOLS AND DEFINITIONS
II.1 KEY TO SYMBOLS
DANGER
WARNING
NOTE
PROCEDURE
REFERENCE (to other document)
II.2 TERMS AND DEFINITIONS
DHW = domestic hot water.
HC = heating circuit
HC1 or C1 = Heating circuit 1 (with or without mixing valve), or
zone 1.
HC2 or C2 = Heating circuit 2 (with or without mixing valve), or
zone 2.
HC3 or C3 = Heating circuit 3 (without mixing valve), or zone 3.
CSK18 = System controller for K18 installed in the provided
enclosure.
Siemens QAA74.611 = advanced room unit.
Siemens QAA55.110 = base room unit.
Appliance / Unit K18 = equivalent terms, both used to refer to
K18 Simplygas or K18 Hybrigas unit type.
Auxiliary boiler = equipment (e.g. boiler) for the production of
heat for space heating and/or DHW, able to integrate or replace
the heat pump of the K18 unit. It is always found in the K18 Hy-
brigas type of unit and consists of an integrated boiler module,
whereas it is optional in K18 Simplygas units, not necessarily
supplied by Robur, and connected to the plumbing system out-
side the unit.
TAC = Technical Assistance Centre authorised by Robur.
III WARNINGS
This manual is an integral and essential part of the product and
must be delivered to the user together with the appliance.
III.1 SAFETY
The appliance must only be used for the purposes for
which it has been designed. Any other use is considered
inappropriate and therefore dangerous. The manufac-
turer does not accept any contractual or extra-contrac-
tual liability for any damage caused by improper use of
the appliance.
Failure to observe the above instructions can compro-
mise the safety of the appliance and voids the Robur
warranty.
Do not operate the appliance if any dangers are present:
mains power problems; parts of the appliance ooded
or damaged in any way; control and safety equipment
tampered with or malfunctioning. In these cases, contact
a professional technician for assistance.
Packaging (plastic bags, polystyrene foam, etc.) must be
kept out of the reach of children, as they are potentially
dangerous.

User instructions: QAA74.611 advanced room unit
User manual – System controller 5
2
1 GENERAL INFORMATION
Figure 1.1 p.5 shows the equipment of the K18 System controller.
Figure1.1K18 system controller components
A QAC34 ambient temperature probe
B CSK18 enclosure
C Room unit 1 (QAA74.611)
D Room unit 2 (Optional - QAA55.110, shown, or QAA74.611)
E Room unit 3 (Optional - QAA55.110, shown, or QAA74.611)
P K18 fault reset button
A
CD E
P
B
2 USER INSTRUCTIONS: QAA74.611 ADVANCED ROOM UNIT
2.1 DESCRIPTION
Figure2.1QAA74.611 room unit - Description of display elements and of the control knob
A Control knob: push and roll
B Display
C Navigation bar
D Status bar
E Work area, for display and setting of data and parameters
C
{
D E
B
A
2.2 DISPLAY ELEMENTS AND RELATIVE FUNCTION
The display is arranged in three distinct areas, shown in Figure
2.1 p.5 .
2.2.1 Navigation bar
it is a vertical strip on the left of the display and contains some
symbols, each representing a group of pages, containing data
and/or setting parameters.
The rst page of a group can be displayed by preselecting one of
the symbols shown in the navigation bar, turning the knob; the
preselected symbol is framed, as shown in Table 2.1 p. 6 . If

User instructions: QAA74.611 advanced room unit
6
2
required, you can then access the pages of the group by selecting
the symbol by pressing the knob; the selected symbol is inverted,
i.e white on black background; see again Table 2.1 p.6 .
Access to pages is required for:
▶ View the following pages of the group, when it contains
more than one.
▶ Change settings on the group page(s).
When accessing a group of pages, the rst editable eld of the
page is preselected and turning the knob again causes preselec-
tion of the other editable elds in the page; the last eld, present
on each page and located at the bottom right, is the symbol.
By preselecting and then selecting it by pressing the knob you
exit from the page group and then go back again to the navi-
gation bar.
Table2.1Navigation bar symbols dierent display states
Unselected symbol: black symbol on white background
Preselected symbol: symbol is framed
Selected symbol: symbol is inverted (white on black
background)
Table 2.2 p. 6 contains the list of symbols in the navigation
bar.
Table2.2Navigation bar symbols
Start page: plant or zone status; access to plant or zone(s)
switch
Temperature page(s): access to main settings for space heating
function
DHW page: access to main settings for DHW handling (if any)
Info page(s): messages (errors, events), plant information
Service/setting pages: other user settings and maintenance
and TAC special settings
2.2.2 Work area
This is the largest display area, used to show pages containing
data and parameters. These pages also provide write access to
editable parameters. Below, as an example, is shown the start
page.
Figure 2.2 p. 6 shows how the device start page looks when
congured as room unit, i.e. when it is installed inside a heated
room and thus acquires the room temperature.
Figure2.2Start page example, for a device congured as room unit
Data:
• Heated room temperature read by the room unit
• Outside temperature read by dedicated probe
Controls:
• Plant/zone switch (described in Paragraph 2.12 p.12 )
Figure 2.3 p. 6 shows how the device looks like, still in room
unit conguration, when in standby: only the heated room tem-
perature is shown. The device enters this state after 8 minutes
without operation on the knob. Any action on it causes the exit
from the standby state and the start page display.
Figure2.3Appearance of the device, when congured as room unit,
in standby
Figure 2.4 p. 6 shows instead how the device start page looks
when congured as operator unit, a setting used when the de-
vice is installed in a technical room and therefore must not read
the heated room temperature; in this case the information actu-
ally reported may vary depending on the type of the system and
on device settings.
When the device is congurated as operator unit, there is no
other standby display: even after long periods without opera-
tion, the start page is shown.
Figure2.4Start page example, for a device congured as operator unit
Data:
• External temperature
• DHW temperature (if any)
• Heating circuit 1 ow temperature (if mixed type)
• Heating circuit 2 ow temperature (if any and if mixed type)
Controls:
• Plant/zone switch (described in Paragraph 2.12 p.12 )
In Figures 2.2 p. 6 and 2.4 p. 6 you can see that the start
page symbol in the navigation bar is selected (white on black
background) and consequently the page has been accessed: the
rst editable eld in the page (in this case "System") is preselect-
ed (its value is framed). Two actions are possible at this point:
1. Pressing the knob causes the eld to be selected, which is
then shown inverted; by turning the knob it is now possible
to change its value and conrm the new setting by pressing
the knob again.
or
2. Clockwise rotation of the knob causes the next eld to be
preselected; in the example shown, the symbol is prese-
lected; pressing again the knob causes the symbol selection,
which in this case causes the exit to the start page with focus
back to the navigation bar.
When the selection of a symbol in the navigation bar causes
access to a group of pages, rather than a single page, the rst
editable eld of each page in the group is intended to choose a
specic page. An example is described in Paragraph 2.3 p.7 .

User instructions: QAA74.611 advanced room unit
User manual – System controller 7
2
2.2.3 Status bar
It is a horizontal strip at the top, always shown inverted, i.e. white
text and symbols on black background. Table 2.3 p. 7 pro-
vides the list of symbols that can be shown on the status bar.
In the status bar are always shown also the date on the left side
and the time on the right side.
Table2.3Status bar symbols
Alarm
It is shown when one or more faults in the
heat source subsystem (K18 heat pump and/
or auxiliary boiler, if any) and/or in the system
management subsystem (heating circuits,
DHW production system, etc.).
Maintenance/
Special operations
This is shown when a special function is
activated or when the maintenance interval
expires. This symbol does not appear in normal
controller settings.
Event It is shown if there is a message about an event
that has occurred on the system.
Manual setting
It is shown if for one or more zones managed
by the device the operating mode setting has
been changed (using the pages accessible
from the navigation bar by selecting the
symbol) compared to the general setting
available on the start page. See Paragraphs
2.3 p.7 and 2.12 p.12 for further details.
Heat source
switched on
It is shown when the main heat source (K18
heat pump) and/or the auxiliary boiler is
switched on.
2.3 SELECTING THE HEATING MODE
1. Turn the knob to preselect symbol in the navigation bar;
the symbol is then shown framed and the main settings
page for the heating function appears, relative to the rst
zone (or heating circuit) managed by the device.
2. Press the knob to select the symbol; the symbol is shown in
negative and the preselection moves to the rst editable
eld on the page, as shown in Figure 2.5 p. 7 , or in Figure
2.6 p. 7 , depending on two possible situations, described
below:
If there are several heating zones or circuits (two or
three), and more than one of them is congured on the
same device (factory setting), the rst editable eld al-
lows choosing the zone on which you want to operate.
This case is shown in Figure 2.5 p. 7 , which shows the
Zone 1 preselected eld. In this case:
– To choose the zone, press the knob to select the eld,
then turn it until the indicated zone is the desired one
(Zone 1, Zone 2, Zone 3), then press it again to con-
rm the choice. The page shown is now the one for the
selected zone.
– Turn again the knob to preselect the Operating
mode eld; the page now appears as shown in Figure
2.6 p.7 .
Figure2.5Heating main settings page (case of several zones cong-
ured on the device) with zone eld preselected
On the other hand, if the heating system has one zone
only, or if only one zone is congured on the specic
device, the zone eld is not editable and therefore can-
not be selected; in this case, the page immediately ap-
pears as shown in Figure 2.6 p. 7 , with the Operating
mode eld already preselected.
Figure2.6Heating main settings page (after zone selection and Op-
erating mode preselection, or in the case of a single zone
congured on the device)
3. Press the knob to select the Operating mode eld; the cur-
rently active mode is shown in negative.
4. Turn the knob to select the desired mode, then press it again
to conrm.
5. Turn the knob to preselect another editable eld on the
page, or to preselect the symbol if you do not want to
edit other elds.
6. Press the knob to select the new eld, or to exit the page and
return to the navigation bar.
Essential information about the dierent operating modes is
given below.
2.3.1 Automatic mode
Automatic mode maintains the room temperature at the Com-
fort or Reduced level, depending on the time program.
Automatic mode characteristics:
▶ Comfort or reduced heating mode, depending on time pro-
gram.
▶ Anti-icing protection functions active.
▶ Automatic summer/winter mode switching (ECO functions)
and 24 hour daily heating limit enabled.
2.3.2 Comfort or reduced continuous mode
These modes provide for continuous operation at Comfort or
Reduced level, respectively.
Continuous mode characteristics:
▶ Constant heating mode, does not follow the time program.
▶ Anti-icing protection functions active.
▶ Continuous operation in Comfort mode: automatic sum-
mer/winter mode switching (ECO functions) and 24 hour
daily heating limit disabled (i.e. heating remains active, the
said functions have no eect).
2.3.3 Protection (antifreeze) mode
Protection mode maintains the room temperature at the (con-
gurable) antifreeze protection level.
Protection mode characteristics:
▶ Constant heating at the antifreeze protection setpoint.
▶ Anti-icing protection functions active.
▶ Automatic summer/winter mode switching (ECO functions)
and 24 hour daily heating limit enabled.

User instructions: QAA74.611 advanced room unit
8
2
2.4 CHANGE ROOM TEMPERATURE
SETPOINT
Change Comfort setpoint
To access and change the Comfort setpoint setting:
1. Proceed as described in steps 1 and 2 of Paragraph 2.3 p.7
in order to access the heating main settings page for the de-
sired zone (Figure 2.6 p.7 ).
2. Turn the knob to preselect the Comfort setpoint eld (the
current value is shown framed).
3. Press the knob to select the eld (the current value is shown
in negative, see Figure 2.7 p.8 ).
Figure2.7Heating main settings page (after Comfort setpoint eld
selection)
4. Turn the knob to set the value and then press it again to
conrm.
5. Turn the knob to preselect another editable eld on the
page, or to preselect the symbol if you do not want to
edit other elds.
6. Press the knob to select the new eld, or to exit the page and
return to the navigation bar.
2.4.1 Change Reduced setpoint and Protection
setpoint (antifreeze)
Reduced and protection room setpoints can only be modied
by accessing the conguration settings pages. The procedure for
setting these parameters is described in Paragraph 4.4 p.15 .
2.5 HEATING TIME PROGRAMS
Each heating zone (or circuit) in the system has a dedicated
weekly time program.
As described in Paragraphs 2.3 p. 7 and 3.3 p. 14 , the time
program associated with a specic heating zone is activated
when the automatic operating mode is selected for that zone.
Each time program enables you to set up to 3 periods of opera-
tion with the comfort setpoint for each day of the week. Outside
these periods, the system maintains the reduced setpoint.
The factory setting for time programs provides, for each day
of the week, a period using the comfort setpoint from 6:00 to
22:00.
2.5.1 Change heating time programs
To access and change heating time programs:
1. Proceed as described in steps 1 and 2 of Paragraph 2.3 p.7
in order to access the heating main settings page for the de-
sired zone (Figure 2.6 p.7 ).
2. Turn the knob to preselect the Time program eld (the eld
is shown framed).
3. Press the knob to select the eld: this opens the heating
weekly time programs page, shown in Figure 2.8 p. 8 . The
Monday time program is preselected.
Figure2.8Heating service weekly time programs page
4. Turn the knob to preselect the desired day time program,
then press the knob to select it and enter the time program
setting page for the selected day. The page looks as shown
in Figure 2.9 p. 8 . The periods of operation at comfort set-
point are represented with horizontal segments, referring to
the time axis from 00:00 to 24:00, which are editable elds:
it is therefore possible to select them to change the settings.
The segment that represents the rst period of operation at
comfort setpoint is preselected by accessing the page. In the
example given in Figure 2.9 p. 8 for Friday there are two
periods, the segment that represents the rst of them is pre-
selected (framed as usual, and also start and end of the time
period are shown, in this example from 06:00 to 09:00).
Figure2.9Daily time program setting page (e.g.: Friday)
5. At this point, depending on the change required, sever-
al actions are possible, described in detail in the following
paragraphs:
Change start and/or end time of a time period (Para-
graph  p.8 ).
Delete time period (Paragraph  p.9 ).
Combine multiple time periods in a single one (Para-
graph  p.9 ).
Add a new time period (Paragraph  p.9 ).
6. When you have nished changing the time program of the
selected day, turn the knob to preselect the Back eld, then
press it to select it; this will return you back to the weekly
time programs page (Figure 2.9 p.8 ).
7. If needed, repeat steps 4-6 several times to change the time
programs for other days of the week.
8. Turn the knob to preselect the Back eld, then press it to
return back to the heating main settings page (Figure
2.6 p.7 ).
9. Turn the knob to preselect another editable eld on the
page, or to preselect the symbol if you do not want to
edit other elds.
10. Press the knob to select the new eld, or to exit the page and
return to the navigation bar.
Change start and/or end time of a time period
▶ Turn the knob to preselect the segment relative to the de-
sired period ( ), then press it to select it; the segment

User instructions: QAA74.611 advanced room unit
User manual – System controller 9
2
is then shown in negative with the start highlighted (
); moreover, the text becomes Start hh:mm, in the example
given in Figure Start 06:00.
▶ To change the start time of the period, turn the knob coun-
terclockwise to anticipate it, or clockwise to posticipate
it; in the graphical representation the beginning of the seg-
ment moves respectively to the left and to the right, more-
over, the text is updated to show the new time period start
time. The minimum value of decrease or increase of the start
time is 10 minutes.
▶ Press the knob to conrm the time period start time setting,
eventually modied, and go to the end time setting; the seg-
ment is now shown with the end highlighted ( ) and
the text becomes End hh:mm, in the example in Figure End
09:00.
▶ To change the end time of the period, proceed as indicated
for the change of the start time, by turning the knob clock-
wise or counterclockwise.
▶ Press the knob to conrm the time period end time setting,
eventually modied, and end the change operation; the seg-
ment is shown again preselected ( ) and the text shows
again the beginning and end time of the period.
▶ If needed, turn the knob to preselect a dierent segment and
repeat the above steps to change the relevant time period.
Delete time period
It is possible to delete a time period by operating as described
above and setting the same start and end time; this way, after
the change, the segment representing the period disappears.
Combine multiple time periods in a single one
It is possible to merge two or three periods in a daily time pro-
gram, simply by changing the end time of a previous period (or
the start time of a following period) so that it overlaps, even
partially, with the other period(s); this way, after the change, the
overlapping periods become a single period, represented by a
single segment.
Add a new time period
▶ Starting from the condition of rst period preselected, turn
the knob counterclockwise; this causes the appearance of
the symbol next to the 00:00 of the time axis and the
change of the text in Add phase.
▶ Press immediately the knob to start creating the new period;
the graphic symbol becomes and the text becomes Start
00:00.
If this step is not performed immediately after the pre-
vious one (within 1-2 seconds), the operation of adding
the new period is aborted; in this case, pressing the knob
causes the editing of the rst already existing period:
if this happens, to avoid unwanted changes press the
knob again twice without turning it to conrm the start
and end time of the existing period, then start over from
the rst step to add the new period.
▶ Turn the knob to change the start time of the new period,
as in the case, described above, of changing the start time
of an existing period; in this case, however, it is also possible
to "bypass" other existing periods if the new one must be
subsequent to them.
▶ Press the knob to conrm the start time setting of the new
period and go to the end time setting; the symbol becomes
and the text End hh:mm (with hh:mm equal to the start
time just set plus 20 minutes).
▶ Turn the knob to change the end time, then press to conrm.
▶ If needed, repeat all steps to add another period.
If the maximum number of periods (three) is already in
use, the add period function is not available.
2.5.2 Copy a daily heating time program to other
days of the week
If several days of the week need the same time program, it is
possible to copy the program created for a given day; even in the
case of days requiring a program similar to an already created
one, it is convenient to copy the existing program rst and then
make the necessary changes.
To copy the time program of a selected day to other days of the
week:
1. Proceed as described in steps 1-4 of Paragraph 2.5.1 p. 8
to access the heating time program setting page for the day
of the week that you intend to copy (Figure 2.9 p. 8 ; in the
example, you intend to copy the Friday program).
2. Turn the knob to preselect the Copy eld, then press to se-
lect it; the page in Figure 2.10 p.9 is then shown.
Figure2.10Time programs copy page
3. Turn the knob to preselect the time program eld corre-
sponding to the day of the week on which you want to copy
the time program, then press the knob to copy: the time pro-
gram will change according to that of the source day (in the
example: ).
4. If needed, repeat the steps described in the previous step to
copy the time program to other days of the week.
5. When copying is complete, turn the knob to preselect the
Done eld, then press it; this will directly return you to the
main heating settings page (Figure 2.6 p.7 ).
6. Turn the knob to preselect another editable eld on the
page, or to preselect the symbol if you do not want to
edit other elds.
7. Press the knob to select the new eld, or to exit the page and
return to the navigation bar.
2.6 WARMER/COOLER FUNCTION
It is possible to temporarily change the room temperature set-
point of one or more zones to suit special situations.
This function can only be used for automatic operating
mode zones (for futher details on operating modes see
Paragraph 2.3 p.7 ).
To access and change the Warmer/Cooler function setting:
1. Proceed as described in steps 1 and 2 of Paragraph 2.3 p.7
in order to access the heating main settings page for the de-
sired zone (Figure 2.6 p.7 ).
2. Turn the knob to preselect Temporary eld (current value is
shown framed).
3. Press the knob to select the eld (the current value is shown
in negative).

User instructions: QAA74.611 advanced room unit
10
2
4. Turn the knob to select the desired function, then press it
again to conrm.
If the current value is Warmer or Cooler, the opposite
function cannot be set directly: the only alternative
value proposed is , i.e function disabled. If you want
to activate the opposite function, set the value rst,
then press the knob again to make a second setting to
the desiderd value.
5. Turn the knob to preselect another editable eld on the
page, or to preselect the symbol if you do not want to
edit other elds.
6. Press the knob to select the new eld, or to exit the page and
return to the navigation bar.
The possible settings for this function are shown below.
Once activated, the Warmer and Cooler functions are automat-
ically deactivated at the next operating mode change of the
active time program (switch from Reduced to Comfort mode or
vice versa), or at midnight, but in any case never earlier than
two hours after activation.
You can also deactivate them manually at any time by setting
them to .
2.6.1 Function disabled
This setting, shown by the symbol, disables the function. The
system uses Comfort or Reduced room setpoint according to the
time program settings, without any alteration.
2.6.2 Warmer function
If the Warmer value is set, the function behaviour depends on
the operating mode, Comfort or Reduced, in which the system
is operating at the time of setting (according to the active time
program):
▶ If the system is in Comfort mode at the time of setting, the
setpoint is set to the highest of the following values:
Comfort setpoint, increased by one degree.
Room temperature, increased by one degree.
▶ If the system is in Reduced mode at the time of setting, the
setpoint is set to the highest of the following values:
Comfort setpoint.
Room temperature, increased by one degree.
2.6.3 Cooler function
If the Cooler value is set, the setpoint is set to the lowest of the
following values:
▶ Actual setpoint (Comfort or Reduced), decreased by one de-
gree.
▶ Room temperature, decreased by one degree.
2.7 SELECTING THE DHW MODE
If the DHW function is present, you can set its activation, in two
dierent modes, or its deactivation.
To access and change the setting:
1. Turn the knob to preselect the symbol in the navigation
bar; the symbol is then shown framed and the main set-
tings page for the DHW function appears.
2. Press the knob to select the symbol; the symbol is shown in
negative and the preselection moves to the rst edita-
ble eld on the page, Operating mode, as shown in Figure
2.11 p.10 .
Figure2.11Main settings page for DHW function
3. Press again the knob to select the Operating mode eld;
the currently active mode is shown in negative.
4. Turn the knob to select the desired mode, then press it again
to conrm.
5. Turn the knob to preselect another editable eld on the
page, or to preselect the symbol if you do not want to
edit other elds.
6. Press the knob to select the new eld, or to exit the page and
return to the navigation bar.
DHW operating modes are described below.
2.7.1 Operating mode On
The system produces DHW at the DHW nominal setpoint, over
the 24 hours or during the periods set in the DHW time program,
if activated; in the latter case, in the remaining periods, the DHW
is kept at the DHW reduced setpoint.
2.7.2 Operating mode Eco
The system produces DHW at the DHW reduced setpoint over
the 24 hours.
2.7.3 Operating mode O
The system does not produce DHW; however, the storage tank
antifreeze protection is active.
2.8 CHANGE DHW SETPOINT
2.8.1 Change DHW nominal setpoint
To access and change the DHW nominal setpoint setting:
1. Proceed as described in steps 1 and 2 of Paragraph
2.7 p. 10 in order to access the DHW main settings page
(Figure 2.11 p.10 ).
2. Turn the knob to preselect the Nominal setpoint eld (the
current value is shown framed).
3. Press the knob to select the eld (the current value is shown
in negative).
4. Turn the knob to set the value and then press it again to
conrm.
5. Turn the knob to preselect another editable eld on the
page, or to preselect the symbol if you do not want to
edit other elds.
6. Press the knob to select the new eld, or to exit the page and
return to the navigation bar.
The factory setting of 55 °C is suited to the vast majority
of household installations.
If the DHW buer tank is oversized, reducing this value to
50 °C will yield cost savings.
If, on the other hand, the tank is relatively small (not an
advisable situation), the value can be increased.
It is advisable, however, not to exceed a value around