Robur K18 Simplygas User manual

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

Revision: B
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.
The original is led at Robur S.p.A.
Any use of this User manual other than for personal consultation must be previously authorised by Robur S.p.A.
The rights of those who have legitimately led the registered trademarks contained within this publication are not aected.
With the aim of continuously improving the quality of its products, Robur S.p.A. reserves the right to modify the data and con-
tents of this User manual without prior notice.
DISPOSAL
The appliance and all its accessories must be disposed of separately in accordance with the regulations in force.
Use of theWEEE symbol (Waste Electrical and Electronic Equipment) indicates that this product cannot be disposed of as house-
hold waste. Proper disposal of this product helps to prevent potential negative consequences for the environment and human
health.

User manual – System controller 3
I Introduction.......................................................................... p.4
I.1 Recipients................................................................ p.4
I.2 References............................................................... p.4
I.3 Available languages ............................................ 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.6
2 User instructions: QAA74.611
advanced room unit..................................................... p.6
2.1 Description ............................................................. p.6
2.2 Display elements and relative function........ p.6
2.3 Selecting the heating mode............................. p.8
2.4 Change room temperature setpoint............. p.9
2.5 Heating time programs...................................... p.9
2.6 Warmer/Cooler function.................................. p.11
2.7 Selecting the DHW mode................................ p.11
2.8 Change DHW setpoint...................................... p.12
2.9 DHW time program ........................................... p.12
2.10 DHW forced charging function ..................... p.13
2.11 Legionella protection........................................ p.13
2.12 Plant/zone switch............................................... p.13
2.13 Information display............................................ p.14
3 User instructions: QAA55.110 basic
room unit................................................................................ p.15
3.1 Legend of commands....................................... p.15
3.2 Display symbols.................................................. p.15
3.3 Selecting the heating mode........................... p.16
3.4 Change room temperature setpoint........... p.16
3.5 Occupancy button............................................. p.16
4 Other settings................................................................... p.17
4.1 Date and time...................................................... p.17
4.2 Start and end of daylight saving time......... p.17
4.3 Language............................................................... p.18
4.4 Heating zone settings....................................... p.18
5 Errors........................................................................................... p.20
5.1 Error list.................................................................. p.20
5.2 System controller error handling.................. p.20
5.3 K18 error handling............................................. p.21
INDEX OF CONTENTS

Introduction
4
I
I INTRODUCTION
User manual
This User manual is a guide to the use and con-
guration of the K18 System controller. The
System controller consists of an electrical enclo-
sure (CSK18), generally installed 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 system
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
equipment's respective installation, user and main-
tenance manuals.
I.1 RECIPIENTS
This manual is specically intended for:
▶ End users, for the operation of the appliance accord-
ing to their own requirements.
▶ Installers of the water and electrical circuits, as a sup-
plement to the K18 System controller installation
manual.
I.2 REFERENCES
Further information can be found in the following
documents:
K18 User manual installation manual.
Installation, use and maintenance manual of the
specic K18 unit model used.
I.3 AVAILABLE LANGUAGES
For versions of this User manual in other languages, see
Robur website.
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 provid-
ed 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 produc-
tion of heat for space heating and/or DHW, able to inte-
grate or replace the heat pump of the K18 unit. It is always
found in the K18 Hybrigas 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 outside the unit.
TAC = Technical Assistance Centre authorised by Robur.
III WARNINGS
This manual is an integral and essential part of the prod-
uct 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 dan-
gerous. The manufacturer does not accept any
contractual or extra-contractual liability for any
damage caused by improper use of the appliance.
Failure to observe the above instructions can com-
promise the safety of the appliance and voids the
Robur warranty.

Warnings
User manual – System controller 5
III
Do not operate the appliance if any dangers are
present: mains power problems; parts of the ap-
pliance ooded or damaged in any way; control
and safety equipment tampered with or malfunc-
tioning. In these cases, contact a professional tech-
nician for assistance.
Packaging (plastic bags, polystyrene foam, etc.)
must be kept out of the reach of children, as they
are potentially dangerous.

General information
6
1
1 GENERAL INFORMATION
Figure 1.1 p.6 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.6 .
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, con-
taining 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. 7 . If required, you can then access the pag-
es 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.7 .
Access to pages is required for:
▶ View the following pages of the group, when it con-
tains more than one.

User instructions: QAA74.611 advanced room unit
User manual – System controller 7
2
▶ 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
preselection 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 navigation 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. 7 contains the list of symbols in the navi-
gation 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 mainte-
nance and TAC special settings
2.2.2 Work area
This is the largest display area, used to show pages con-
taining 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. 7 shows how the device start page
looks when congured as room unit, i.e. when it is in-
stalled 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.13 )
Figure 2.3 p. 7 shows how the device looks like, still in
room unit conguration, when in standby: only the heat-
ed room temperature 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. 7 shows instead how the device start
page looks when congured as operator unit, a setting
used when the device is installed in a technical room and
therefore must not read the heated room temperature; in
this case the information actually reported may vary de-
pending 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
operation, the start page is shown.
Figure2.4Start page example, for a device congured as op-
erator 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.13 )
In Figures 2.2 p. 7 and 2.4 p. 7 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 preselected (its value is framed). Two ac-
tions 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 set-
ting by pressing the knob again.
or
2. Clockwise rotation of the knob causes the next eld
to be preselected; in the example shown, the sym-
bol is preselected; pressing again the knob causes the

User instructions: QAA74.611 advanced room unit
8
2
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 caus-
es access to a group of pages, rather than a single page,
the rst editable eld of each page in the group is intend-
ed to choose a specic page. An example is described in
Paragraph 2.3 p.8 .
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. 8 provides 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 opera-
tions
This is shown when a special function is
activated or when the maintenance inter-
val 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) com-
pared to the general setting available on
the start page. See Paragraphs 2.3 p.8
and 2.12 p.13 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 naviga-
tion 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. 8 , or in Figure 2.6 p. 8 , 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 allows choosing the zone on which you want
to operate. This case is shown in Figure 2.5 p. 8 ,
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.8 .
Figure2.5Heating main settings page (case of several zones
congured 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 cannot be selected; in this case,
the page immediately appears as shown in Figure
2.6 p. 8 , with the Operating mode eld already
preselected.
Figure2.6Heatingmainsettingspage(afterzoneselectionand
Operating mode preselection, or in the case of a sin-
gle zone congured on the device)
3. Press 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.
Essential information about the dierent operating
modes is given below.
2.3.1 Automatic mode
Automatic mode maintains the room temperature at
the Comfort or Reduced level, depending on the time
program.
Automatic mode characteristics:
▶ Comfort or reduced heating mode, depending on
time program.

User instructions: QAA74.611 advanced room unit
User manual – System controller 9
2
▶ Antifreeze protection functions active.
▶ Automatic summer/winter mode switching (ECO func-
tions) 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 pro-
gram.
▶ Antifreeze protection functions active.
▶ Continuous operation in Comfort mode: automatic
summer/winter mode switching (ECO functions) and
24 hour daily heating limit disabled (i.e. heating re-
mains 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 mode at the antifreeze protection
setpoint.
▶ Antifreeze protection functions active.
▶ Automatic summer/winter mode switching (ECO func-
tions) and 24 hour daily heating limit enabled.
2.4 CHANGE ROOM TEMPERATURE
SETPOINT
2.4.1 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. 8 in order to access the heating main settings
page for the desired zone (Figure 2.6 p.8 ).
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.9 ).
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.
2.4.2 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.18 .
2.5 HEATING TIME PROGRAMS
Each heating zone (or circuit) in the system has a dedicat-
ed weekly time program.
As described in Paragraphs 2.3 p. 8 and 3.3 p. 16 , the
time program associated with a specic heating zone is
activated when the Automatic operating mode is select-
ed for that zone.
Each time program enables you to set up to 3 periods of
operation with the comfort setpoint for each day of the
week. Outside these periods, the system maintains the re-
duced 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. 8 in order to access the heating main settings
page for the desired zone (Figure 2.6 p.8 ).
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 heat-
ing weekly time programs page, shown in Figure
2.8 p.9 . 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 pro-
gram, 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.10 . The periods
of operation at comfort setpoint 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. 10 for
Friday there are two periods, the segment that repre-
sents the rst of them is preselected (framed as usual,
and also start and end of the time period are shown, in
this example from 06:00 to 09:00).

User instructions: QAA74.611 advanced room unit
10
2
Figure2.9Daily time program setting page (e.g.: Friday)
5. At this point, depending on the change required, sev-
eral actions are possible, described in detail in the fol-
lowing paragraphs:
Change start and/or end time of a time period
(Paragraph 2.5.1.1 p.10 ).
Delete time period (Paragraph 2.5.1.2 p.10 ).
Combine multiple time periods in a single one
(Paragraph 2.5.1.3 p.10 ).
Add a new time period (Paragraph 2.5.1.4 p.10 ).
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.10 ).
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.8 ).
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.
2.5.1.1 Change start and/or end time of a time period
▶ Turn the knob to preselect the segment relative to
the desired period ( ), then press it to select it;
the segment 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
counterclockwise to anticipate it, or clockwise to
posticipate it; in the graphical representation the be-
ginning of the segment moves respectively to the left
and to the right, moreover, 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 segment is now shown with the end high-
lighted ( ) 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 indi-
cated for the change of the start time, by turning the
knob clockwise or counterclockwise.
▶ Press the knob to conrm the time period end time
setting, eventually modied, and end the change
operation; the segment 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 seg-
ment and repeat the above steps to change the rele-
vant time period.
2.5.1.2 Delete time period
It is possible to delete a time period by operating as de-
scribed above and setting the same start and end time;
this way, after the change, the segment representing the
period disappears.
2.5.1.3 Combine multiple time periods in a single one
It is possible to merge two or three periods in a daily time
program, 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 sin-
gle period, represented by a single segment.
2.5.1.4 Add a new time period
▶ Starting from the condition of rst period preselect-
ed, 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
previous 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 pe-
riod, 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 al-
ready in use, the add period function is not avail-
able.
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