ROBUA QAC34/101 User manual

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

Revision: B
Code: D-LBR849
This Installation manual has been drawn up and printed by Robur S.p.A.; whole or partial reproduction of this
Installation manual is prohibited.
The original is led at Robur S.p.A.
Any use of this Installation 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 contents of this Installation 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.

Installation manual – System controller 3
I Introduction.......................................................................... p.4
I.1 Recipients................................................................ p.4
I.2 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 General and safety warnings............................ p.4
III.2 Compliance............................................................. p.5
III.3 Equipment .............................................................. p.5
III.4 Exclusions of liability and warranty ............... p.5
1 General information and system
diagrams.................................................................................... p.6
2 Mounting and installation.................................... p.9
2.1 CSK18 system controller enclosure.............. p.10
2.2 Siemens QAC34 ambient temperature
probe....................................................................... p.13
2.3 QAA55.110 basic room unit (optional)....... p.15
2.4 QAA74.611 advanced room unit .................. p.17
2.5 OVLV007 diverter valve (optional) ............... p.18
2.6 The K18 unit ......................................................... p.19
3 Electrical hookup.......................................................... p.20
3.1 Hooking up the room unit.............................. p.20
3.2 Temperature probes connection.................. p.21
3.3 Water circulation pump connection............ p.22
3.4 Mixer/diverter valve connection................... p.23
3.5 External requests connection........................ p.25
3.6 K18 unit connection to CSK18 enclosure
................................................................................... p.26
3.7 Temperature probes connection to K18
unit........................................................................... p.27
3.8 Auxiliary boiler connection (if present)
to the K18 unit (only for K18 Simplygas
models) .................................................................. p.27
4 Commissioning................................................................ p.28
4.1 Using the QAA74.611 advanced room
unit's interface..................................................... p.28
4.2 Commissioning procedure ............................. p.30
4.3 Functional tests................................................... p.30
4.4 Standby.................................................................. p.33
5 Settings..................................................................................... p.33
5.1 Optimising heating service............................. p.33
5.2 Optimising DHW production......................... p.38
5.3 Optimizing auxiliary boiler management
................................................................................... p.39
6 Errors........................................................................................... p.39
6.1 List of errors and troubleshooting
instructions........................................................... p.39
6.2 Error log ................................................................. p.42
7 Special operations and congurations
............................................................................................................ p.42
7.1 Restoring factory settings............................... p.42
7.2 Locking QAA55.110 room unit controls..... p.42
Appendix A: technical data................................ p.43
INDEX OF CONTENTS

Introduction
4
I
I INTRODUCTION
Installation manual
This Installation manual contains all the infor-
mation required for installing and conguring
the System controller for all K18 Simplygas heat
pump units (Gas Absorption Heat Pump) and K18
Hybrigas hybrid units (Gas Absorption Heat Pump
and integrated auxiliary boiler module), according
to one of the standard system congurations, also
described in the document.
Referring to this manual requires familiarity with
Robur products and is based on certain informa-
tion included in the specic product manuals to
which this document refers.
I.1 RECIPIENTS
This Manual is intended for:
▶ Electrical installers for proper installation of the con-
trol equipment.
▶ Installers and authorised Robur Technical Assistance
Centres (TAC) for conguration.
I.2 AVAILABLE LANGUAGES
For versions of this Installation manual in other languag-
es, 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
Siemens RVS21.826 = control unit (electronic board).
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.
DHW = Domestic Hot Water.
III WARNINGS
III.1 GENERAL AND SAFETY WARNINGS
Installer's qualications
Installation must exclusively be performed by a
qualied rm and by skilled personnel, with specif-
ic knowledge of electrical systems, in compliance
with the laws in force in the Country of installation.
Declaration of conformity
Upon completing installation, the installing rm
shall issue to the owner/client the appliance's
workmanlike conformity declaration, according to
national/local regulations in force and the manu-
facturer's instructions/provisions.
Misuse
The appliance must only be used for the purpos-
es for which it has been designed. Any other use is
deemed hazardous. Incorrect use may aect oper-
ation, duration and safety of the appliance. Adhere
to the manufacturer's instructions.
Electrocution hazard
Disconnect the electrical power supply before any
operation on appliance components.
For electrical connections exclusively use compli-
ant components and according to the specica-
tions provided by the manufacturer.
Ensure the appliance cannot be accidentally
switched back on.

Warnings
Installation manual – System controller 5
III
Earthing
Electrical safety depends on eective earthing sys-
tem, correctly connected to the appliance and in-
stalled according to the regulations in force.
In the event of failure
Operations on internal components and repairs
may exclusively be carried out by a TAC, using only
original spare parts.
In the event of fault of the appliance, do not at-
tempt to repair and/or restore and immediately
contact the TAC.
Keep the Manual
This Installation manual must always accompany
the appliance and must be handed to the new
owner or installer in the event of sale or removal.
The equipment must be installed indoors and out
of the weather. For its positioning, refer to the pro-
tection rating given in Paragraph 2 p.9 .
III.2 COMPLIANCE
For the appliance's technical and conformity data, refer to
Appendix A  p.43 .
III.3 EQUIPMENT
The standard equipment for the System controller
includes:
1. CSK18 electrical enclosure: contains the Siemens
RVS21.826 electronic board, the relays and electrical
terminal blocks.
1. QAA74.611 advanced room unit.
1. Siemens QAC34 outdoor temperature probe.
Optional additional room units are available, of types
QAA74.611 (optional code ODSP050) and QAA55.110 (op-
tional code ODSP004).
III.4 EXCLUSIONS OF LIABILITY AND
WARRANTY
Any contractual or extra-contractual liability of the
manufacturer for any damage caused by incorrect
installation and/or improper use and/or failure to
comply with regulations and with the manufactur-
er's directions/instructions shall be disclaimed.
In particular, the warranty on the appliance may be
rendered void by the following conditions:
Incorrect installation/cabling.
Misuse.
Failure to comply with the manufacturer's indica-
tions on installation, use and maintenance.
Alteration or modication of the product or any
part thereof.
Extreme operational conditions or however out-
side of the operational ranges set forth by the man-
ufacturer.
Abnormal actions transmitted to the appliance by
the system or installation (mechanical stresses,
pressure, vibrations, thermal expansion, electrical
surges...).
Accidental damages or due to force majeure.

General information and system diagrams
6
1
1 GENERAL INFORMATION AND SYSTEM DIAGRAMS
The System controller for the models of the K18 family es-
sentially ensures:
▶ Controls ambient comfort by controlling the heating
circuits or zone valves.
▶ Manage the domestic hot water (DHW) production, by
controlling the components dedicated to charge the
DHW buer tank.
▶ Manage the heat generation, by controlling a K18
Simplygas or a K18 Hybrigas unit.
All this is possible for certain types of system plumbing
diagrams indicated in Figures 1.1 p. 6 , 1.2 p. 7 and
1.3 p. 7 with regards to the K18 Simplygas unit and
Figures 1.4 p. 8 , 1.5 p. 8 and 1.6 p. 9 with re-
gards to the K18 Hybrigas unit.
The System controller for K18 unit is supplied
precongured to facilitate the installation and
startup of the types of system illustrated in Figure
1.1 p. 6 , 1.2 p. 7 and 1.3 p. 7 , 1.4 p. 8 ,
1.5 p. 8 and 1.6 p. 9 . However, it can also
support other congurations. For applications
other than those indicated in this manual, Robur
provides custom consultancy service.
For water circuits with primary circuit only (Figure
1.1 p. 6 , 1.2 p. 7 , 1.4 p. 8 e 1.5 p. 8 )
water circulation must be guaranteed to handle the
K18 unit's antifreeze cycle. In the diagrams given in
Figure 1.2 p. 7 and 1.5 p. 8 this requires that
a outlet/inlet bypass is installed, with overpressure
valve set to open only when both zone valves are
closed. For the diagrams given in Figure 1.1 p. 6
and 1.4 p. 8 it may be sucient to ensure cir-
culation in one branch of the distribution; for in-
stance, by not installing the valve (thermostatic or
manual) on one of the radiators.
Thefollowingdiagramsintendtoshowthehydraulic
congurations supported by System controller, in-
cluding the parts to be connected to it. Ancillary
hydraulic components (expansion tanks, safety
valves, etc.) are only shown as a guide; for the
detailed plumbing layout, refer to the handbook
of the K18 range and to the specic installation
manual of the K18 unit used.
Figure1.1System with K18 Simplygas unit, primary water circuit only and one zone, auxiliary boiler and DHW production optionals
A Unit K18 Simplygas
B Auxiliary boiler (optional)
C check valve (to be installed only in the presence of an auxiliary
boiler)
D External water pump (only for C0 versions)
E Room unit 1 (QAA74.611)
P
A
D
ST
B9
B3
Q3
B
CST
F
ST
GHP'
CSK18
HC1
K18 CONTROL CABLE
AUX BOILER
GHP
230V W. PUMP
0-10V W. PUMP

General information and system diagrams
Installation manual – System controller 7
1
Figure1.2System with K18 Simplygas unit, primary water circuit only and two zones, auxiliary boiler and DHW production optionals
A Unit K18 Simplygas
B Auxiliary boiler (optional)
C check valve (to be installed only in the presence of an auxiliary
boiler)
D External water pump (only for C0 versions)
E Bypass section with overpressure valve
F Room unit 1 (QAA74.611)
G Thermostats (with timer) for zones
P
ST
B9
B3
Q3
B
CST ST
GHP'
CSK18
HC1
E
GF
Q2
HC2
G
Q6
GHP
A
D
K18 CONTROL CABLE
AUX BOILER
230V W. PUMP
0-10V W. PUMP
Figure1.3System with K18 Simplygas unit, primary and secondary water circuits, up to two heating circuits, one of which is option-
ally mixed, auxiliary boiler and DHW production optionals
A Unit K18 Simplygas
B Auxiliary boiler (optional)
C check valve (to be installed only in the presence of an auxiliary
boiler)
D External water pump (only for C0 versions)
E Decoupling of primary/secondary circuits
F Room unit 1 (QAA74.611)
H Room unit 2 for HC2 circuit (optional, QAA74.611 or QAA55.110)
P
ST
B9
B3
Q3
B
CST ST
GHP'
CSK18
GHP
H
E
ST
F
HC1 HC2
Q2 Q6
Y1/Y2
B1
A
D
K18 CONTROL CABLE
AUX BOILER
230V W. PUMP
0-10V W. PUMP

General information and system diagrams
8
1
Figure1.4System with K18 Hybrigas unit, primary water circuit only and one zone, DHW production optional
A K18 Hybrigas unit F Room unit 1 (QAA74.611)
P
A
ST
B9
B3
Q3
F
ST
CSK18
HC1
GHP
K18 CONTROL CABLE
Figure1.5System with K18 Hybrigas unit, primary water circuit only and two zones, DHW production optional
A K18 Hybrigas unit
E Bypass section with overpressure valve
F Room unit 1 (QAA74.611)
G Thermostats (with timer) for zones
P
A
ST
B9
B3
Q3
ST
CSK18
GHP
HC1
GF
Q2
HC2
G
Q6
E
K18 CONTROL CABLE

Assembly and installation
Installation manual – System controller 9
2
Figure1.6SystemwithK18 Hybrigasunit, primary andsecondary watercircuits,up totwo heating circuits,oneof which isoptionally
mixed, DHW production optional
A K18 Hybrigas unit
E Decoupling of primary/secondary circuits
F Room unit 1 (QAA74.611)
H Room unit 2 for HC2 circuit (optional, QAA74.611 or QAA55.110)
P
A
ST
B9
B3
Q3
ST
CSK18
GHP
H
E
ST
F
HC1 HC2
Q2 Q6
Y1/Y2
B1
K18 CONTROL CABLE
All temperature probes (GHP, GHP', B1, B3) must be
placed and xed in dedicated thermowells, with a
length suitable to result immersed in water ow
or in water mass, using thermal paste to ensure a
good heat transfer.
In case one of the optional DHW preparation tanks
is used (code OSRB012 or OSRB004), it is recom-
mended to use the thermowell just above mid
height for the probe B3.
Even in case other water tanks are used, place
probe B3 in an intermediate position, possibly just
above mid height.
2 MOUNTING AND INSTALLATION
The System controller for the K18 is supplied preassem-
bled and precabled in an IP55 rated enclosure.The protec-
tion rating is reduced if the included cable gland caps are
used. Use suitable cable glands (not included) to maintain
the indicated protection rating, if necessary.
Before installing the unit, check that the equip-
ment is not connected to its power supply.
The cabling must satisfy the requirements of safety
class II, i.e. the mains power cables and the SELV
cables must be ducted separately.
Also, keep a distance of at least 50 mm between
the ducts that contain mains cables and those
which contain safety extra low voltage cables and
between the two categories of cables inside the
enclosure; to achieve this, with reference to Figure
2.1 p.10 , use:
For the mains connections: the hole on the lower
left side of the enclosure and, if required, the two
holes at the centre and at the top on its left side.
For the safety extra low voltage connections:
the two holes at the centre and on the lower right
side of the enclosure and, if required, the two holes
at the centre and at the bottom on its right side.
Do NOT use the holes on the upper side of the
enclosure, the hole at the top on its right side
and the one on the bottom on the left side.
The CSK18 and any other equipment and accesso-
ries must be powered up only when the installa-
tion is complete. Failure to observe this instruction
incurs a risk of electrocution and short-circuit.
The CSK18 must not be exposed to water.
The unit's ambient operating temperature range is
0 °C - 50 °C.

Assembly and installation
10
2
2.1 CSK18 SYSTEM CONTROLLER ENCLOSURE
2.1.1 Mounting and installation
Figure2.1External overall dimensions for CSK18 enclosure
A Input of connections to the mains
B Input of safety extra low voltage (SELV)
connections
C Do not use
P K18 fault reset button
A
A
C
A B B
C
B
B
C C C
P

Assembly and installation
Installation manual – System controller 11
2
Figure2.2General layout of components and wiring diagram for K18 system controller
RESET
2 7
L
N
X10 1
QX1
N
X12 1
SIEMENS
RVS21.826
X15 1
1 X80
1 X75
M
BX4
M
BX3
GX1
H3
M
H1
1 X86
G+
M
BSB
QX2
QX2
FX3
QX3
EX4
EX3
EX2
EX1
X11 1
N
QX4
QX4
N
QX5
ZX6
N
N
M
UX1
BX2
M
M
BX1
UX2
M
D2
D1
D3
UX3
M
DI6
DI7
M
LL
CTRL
N
N
LINE IN DHW Q3
AL AL 0+10
COM
RES
DHW
K18
EXTERN.
RESET
REQ
K18 CONTROL CABLE
2 9 7 31824765
1 X84
GX1
AL
COM
DHW
N
Q3
L
EX1
28
IF30
8
5
2
9
7
The electrical connections are partly done with the
terminal blocks inside the bottom of the enclosure,
and partly with the included extractable connec-
tors which t directly onto the board.
Table 2.1 p. 12 lists the Line Voltage supply and signal
connections on the extractable connectors at the left
edge of the Siemens RVS21.826 board (with reference to
the electronic board orientation inside the enclosure, see
Figure 2.1 p. 10 ), while Table 2.2 p. 12 lists the Line
Voltage supply and signal connections on the terminal
block at the bottom left interior of the CSK18 enclosure.
To identify the position of the connectors and terminal
blocks, refer to the wiring diagram given in g. 2.2 p.11 .
To identify the plumbing parts and the sensors that cor-
respond to the Siemens function codes (e.g. Q2, Y1, Y2)
refer to the plumbing diagrams in Figures 1.1 p. 6 ,
1.2 p. 7 and 1.3 p. 7 with regards to applications
with K18 Simplygas units and 1.4 p. 8 , 1.5 p. 8 ,
1.6 p.9 for applications with K18 Hybrigas units.

Assembly and installation
12
2
Table2.1Line Voltage connections to Siemens RVS21.826 board connectors
Function (Siemens logo on water circuit diagrams and description) Logo on connector
Color Siemens connector code
L 230 VAC phase input to RVS21.826 Pre-wired X10
Green BPZ:AGP5S.03A/109
Ground connection to RVS21.826 Pre-wired
N Neutral input to RVS21.826 Pre-wired
EX1 K18 unit alarm signal input on RVS21.826 Pre-wired
X11
Green BPZ:AGP5S.04D/109
EX2 Not used
EX3 Not used
EX4 Not used
QX1 Y1 - heating circuit 1 mixer valve open phase output
X12
Green BPZ:AGP5S.07H/109
NHeating circuit 1 mixer valve neutral output
QX2 Y2 - heating circuit 1 mixer valve close phase output
QX2
Not used
NQ6 - Heating circuit 2 water pump neutral output / Zone 2 valve
FX3 Phase input for output QX3 Pre-wired
QX3 Q6 - Heating circuit 2 water pump phase output / Zone 2 valve
QX4 DHW diverter valve control phase output (2) Pre-wired
X15
Orange BPZ:AGP5S.07M/109
QX4
Q3 - DHW diverter valve phase inverse output (1)
N Neutral output Pre-wired
QX5 Q2 - Heating circuit 1 water pump phase output / Zone 1 valve
NQ2 - Heating circuit 1 water pump neutral output / Zone 1 valve
ZX6 Not used
N Not used
(1) Not normally used. It may be used:
* In place of Q3 (see Table 2.2 p.12 ) if the DHW diverter valve is set to DHW when the phase is NOT present at the output.
* In addition to Q3 if the valve has an actuator with two terminals which are excited alternately to set the valve to Heating or DHW circuit.
(2) Connect the valve to the CTRL output (Table 2.2 p.12 ).
Table2.2Line Voltage connections to bottom LH terminal block in CSK18 enclosure
Function (description) Group of terminals
L 230 VAC phase power input
LINE IN
N Neutral power input
Ground connection
L DHW diverter valve power xed phase output
DHW Q3
CTRL Q3 - DHW diverter valve power control phase output (1)
N DHW diverter valve power neutral output
DHW diverter valve power ground connection
(1) Output Q3 is active (230 VAC phase present) during DHW service and inactive during space heating service. See note (1) to Table 2.1 p.12 .
Table 2.3 p. 13 lists the SELV supply and signals con-
nections on the extractable connectors at the bottom
and right edges of the Siemens RVS21.826 board (once
more with reference to the specic position of the board
inside the enclosure), while Table 2.4 p.13 lists the SELV
signals connections on the terminal block at the bottom
right interior of the CSK18 enclosure.
The connections in Table 2.4 p. 13 include those
which connect the System controller to the K18
unit.

Assembly and installation
Installation manual – System controller 13
2
Table2.3SELV signal connection to Siemens RVS21.826 board
Function (Siemens logo on water circuit diagrams and description) Logo on connector
Color Siemens connector code
BX1 B9 - Outdoor temperature sensor input
X80
Grey BPZ:AGP5S.08N/109
MB9 - Outdoor temperature sensor input
BX2 Not used (available for additional functions)
M Not used (BX2 return mass)
UX1 Not used (available for additional functions)
M Not used (UX1 return mass)
UX2 Not used (available for additional functions)
M Not used (UX2 return mass)
BX3 B3 - DHW buer tank temperature sensor input
X84
Grey BPZ:AGP5S.04E/109
MB3 - DHW buer tank temperature sensor input
BX4 B1 - Heating circuit 1 temperature sensor input (mixed only)
MB1 - Heating circuit 1 temperature sensor input (mixed only)
BSB BSB+ - QAA74/QAA55 Room Unit data bus connection
X86
Grey BPZ:AGP5S.07K/109
MBSB- - QAA74/QAA55 Room Unit data bus ground
G+ G+ - QAA74 Room Unit backlighting power output
H1 H1 - Heating circuit 1 normally open request signal input (1)
MH1/H3 - Heating circuit 1 and 2 request signal input return
H3 H3 - Heating circuit 2 normally open request signal input (2)
GX1 GX1- 12 VDC power output Pre-wired
(1) Input H1 is prewired active with a jumper to terminal H1/H3; to insert an external request signal (voltage-free contact), remove the jumper and cable it between
terminals H1 and H1/H3.
(2) Input H3 is open to keep heating circuit 2 inactive. If this heating circuit is present, t a jumper between terminals H3 and H1/H3 or insert an external request signal
between them (voltage-free contact).
Table2.4SELV signal connection to bottom RH terminal block in CSK18 enclosure
Function (description) Group of terminals
AL K18 unit alarm signal input
GAHP K18 CONTROL CABLE
AL K18 unit alarm signal input
K18 unit cable shielding braid ground connection
0 K18 unit 0 – 10V setpoint output ground
+10 K18 unit 0 - 10V setpoint output
COM K18 unit digital output common ground
RES K18 unit alarm reset digital output
DHW Service type request digital output to K18 unit (heating/DHW)
REQ Service request (request) digital output to K18 unit
GAHP K18 EXTERN
RESET K18 alarm reset external control input (NO voltage-free contact)
EXTERNAL RESET
GAHP K18 EXTERN
RESET K18 alarm reset external control input (NO voltage-free contact)
2.2 SIEMENS QAC34 AMBIENT TEMPERATURE PROBE
The external sensor is essential to the operation of the
CSK18 system. If this sensor is not connected to the
Siemens RVS21.826 board, the system is not operational.
The sensor is used to acquire the external temperature
and, in part, also the eects of the sunlight, the wind and
the temperature of the wall to which it is mounted.
2.2.1 Technical specications
Table2.5Characteristics of QAC34/101 external sensor
Model Sensor type Measurement
range (°C) Tolerance (K) (1) Time constant (min) Weight (g) Wire cross section (mm²) Max. length (m)
QAC34/101 NTC1000 Ω at
25 °C -50...70 ± 1 12 73 1,5 120
(1)QAC34/101 over range –10 - +20 °C

Assembly and installation
14
2
2.2.2 Mounting and installation
Figure2.3Description of installation procedure for QAC34 external sensor
H
H
2
/
1
N
N-W
3
min2,5 m
1
2
4
Figure2.4QAC34 external room sensor dimensions
49,7
91,6
79,8
3
8,5
5,5
14,1
25 24,5
49,5
9,5
4
5,5
6

Assembly and installation
Installation manual – System controller 15
2
2.3 QAA55.110 BASIC ROOM UNIT OPTIONAL
2.3.1 Location
Figure2.5Description of installation position of room unit
The room unit should be installed in a reference room,
usually the living room, bearing the following in mind:
▶ The room unit must be installed about 1,5 m o the
ground, in an area which allows the sensor to read the
room temperature as accurately as possible, it should
therefore be out of the way of draughts, sunlight and
other sources of heat.
▶ If wall mounted, leave enough space above the unit
for it to be installed and removed when necessary.
Once removed from its base, the room unit is no
longer powered and is thus inactive.
2.3.2 Installation
Figure2.6Description of installation procedure for room unit QAA55.110
Do not install the room unit in rooms exposed to
water or damp.
For further details on the operation, installation
and use of the room unit, refer to Section 5 p.33 ,
in particular to Paragraphs 5.1.5 p. 36 and
5.1.7 p.37 .

Assembly and installation
16
2
2.3.3 Dimensions and jig for installation holes
Figure2.7Description of mounting holes for room unit QAA55.110
96
96
91
47
12
4,2
56 60
56
60
2.3.4 Electrical hookup
Figure2.8Room unit QAA55.110 connections
1
34
56 2
Table2.6Room unit QAA55.110 connections
Terminal Name Description
1 BSB Data bus BSB +
2 M Data bus BSB -

Assembly and installation
Installation manual – System controller 17
2
2.4 QAA74.611 ADVANCED ROOM UNIT
2.4.1 Location
Figure2.9Description of installation position of room unit
The room unit should be installed in a reference room,
usually the living room, bearing the following in mind:
▶ The room unit must be installed about 1,5 m o the
ground, in an area which allows the sensor to read the
room temperature as accurately as possible, it should
therefore be out of the way of draughts, sunlight and
other sources of heat.
▶ If wall mounted, leave enough space above the unit
for it to be installed and removed when necessary.
Once removed from its base, the room unit is no
longer powered and is thus inactive.
2.4.2 Installation
Figure2.10Description of installation procedure for room unit QAA74.611
b
1
4
5
2
3
Do not install the room unit in rooms exposed to
water or damp.
For further details on the operation, installa-
tion and use of the room unit, refer to section
5 p. 33 , in particular Paragraph 5.1.5 p. 36 and
5.1.7 p.37 .

Assembly and installation
18
2
2.4.3 Dimensions and jig for installation holes
Figure2.11Description of mounting holes for room unit QAA74.611
26.4
33
4848
45. 1 28 28
33
35
5
23
72 72
2 58
134
144
10 10 7.6
22
78.012.7
58.8
86
48
96
2.4.4 Electrical hookup
Figure2.12Room unit QAA74.611 connections
Table2.7Room unit QAA74.611 connections
Terminal Name Description
3 BSB Data bus BSB +
2 M Data bus BSB -
1 G+ Power 12 V DC
2.5 OVLV007 DIVERTER VALVE
OPTIONAL
Figure2.13OVLV007 diverter valve dimensions
D
C
94
136
8649
8649
09
09
A B
AB
Consider the following for the hydraulic connection:
▶ AB = common
▶ A = DHW circuit
▶ B = space heating circuit

Assembly and installation
Installation manual – System controller 19
2
2.6 THE K18 UNIT
For installation considerations, refer to the Installation,
use and maintenance manual of the specic mode of K18
unit.
For convenience we include the terminal block details for
the electrical hookup here.
Figure2.14Terminal block for electrical connections of K18 unit
1 Connection to CSK18 enclosure (see Paragraph 3.6 p.26 )
2 Modbus connection to RS485 port for optional monitoring
3 GHP' temperature sensor connection (see Paragraph 3.7 p.27 )
4 GHP temperature sensor connection (see Paragraph 3.7 p.27 )
5 Connection of 0-10 V signal on the optional external water pump
(only for K18 Simplygas C0 models; see manual of specic K18
unit used)
6 Optional auxiliary boiler connection (only for K18 Simplygas
models; see Paragraph 3.8 p.27 )
7 Supply connection on the optional external water pump (only for
K18 Simplygas C0 models; see manual of specic K18 unit used)
8 Power connection (see K18 unit manual)
9 Earth connections for signal cable shielding
K18 CONTROL CABLE
AUX
PROBE 2
AUX
PROBE 1
RS485
230V W. PUMP
N
L
ON/OFF
N
L
+10
0
T1
0
W. PUMP
+10
T1
COM
B
A
T2
T2
GND
0
AL
AL
+10
DHW
REQ
RES
+ AL
0 AL
AUX
BOILER
AUX
BOILER
AUX
BOILER
1
2
9
3
4
9
5
6
7
8

Electrical hookup
20
3
3 ELECTRICAL HOOKUP
3.1 HOOKING UP THE ROOM UNIT
Figure3.1Example of connection of two room units, one type QAA74.611, the other (optional) type QAA55.110
A Grey connector X86 (bottom edge of RVS21.826 board)
B Room unit 1 (QAA74.611)
C Ambient unit 2 (QAA55.110) (optional code ODSP004)
NOTE Use shielded signal cable 3x0.75 mm2(2x0.75 mm2 for QAA55.110).
Maximum total length 400 m.
Maximum length between controller and room unit 200 m.
Both room units can also be connected to connector X86.
B C
GX1
H3
M
H1
1 X86
G+
M BSB
3 2 11 2
A
Table3.1QAA74.611 and QAA55.110 (optional) room unit
connection
RVS21.826 QAA74.611 QAA55.110
BSB 3 1
M 2 2
G+ 1 -