Robur K18 Hybrigas User manual

nominal thermal power 37,9 kW
nominal thermal power for DHW 37,9 kW
Hybrid system with gas absorption heat pump and
condensing boiler for heating and buer tank domestic hot
water production
K18 Hybrigas
Installation, Use and Maintenance
Manual

This Installation, use and maintenance manual has been drawn up and printed by Robur S.p.A.; whole or partial reproduction of this
Installation, use and maintenance manual is prohibited.
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Installation, use and maintenance manual without prior notice.
Revision: A
Code: D-LBR827

Installation, use and maintenance manual – K18 Hybrigas 3
I Introduction............................................................................. p.4
I.1 Recipients .......................................................................... p.4
I.2 Control device.................................................................. 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 Conformity ........................................................................ p.6
III.3 Exclusions of liability and warranty.......................... p.6
1 Features and technical data...................................... p.7
1.1 Features.............................................................................. p.7
1.2 Dimensions ..................................................................... p.10
1.3 Connection plate detail.............................................. p.11
1.4 Components................................................................... p.12
1.5 Electrical wiring diagram ........................................... p.18
1.6 Electronic board............................................................ p.20
1.7 Operation mode............................................................ p.21
1.8 Controls ............................................................................ p.21
1.9 Technical characteristics............................................. p.22
2 Transport and positioning........................................ p.24
2.1 Warnings.......................................................................... p.24
2.2 Handling........................................................................... p.24
2.3 Appliance positioning................................................. p.25
2.4 Minimum clearance distances.................................. p.25
2.5 Mounting base............................................................... p.26
3 Heating engineer............................................................... p.26
3.1 Warnings.......................................................................... p.26
3.2 Installation....................................................................... p.26
3.3 Hydraulic connections ................................................ p.30
3.4 Anti-icing function........................................................ p.30
3.5 Anti-icing liquid............................................................. p.30
3.6 System water quality ................................................... p.31
3.7 Installation lling .......................................................... p.31
3.8 Boiler safety valve drain ducting connection..... p.32
3.9 Fuel gas supply .............................................................. p.32
3.10 Combustion products exhaust ................................ p.32
3.11 Flue gas condensate discharge................................ p.33
3.12 Defrosting water drainage......................................... p.34
4 Electrical installer.............................................................. p.34
4.1 Warnings.......................................................................... p.34
4.2 Electrical systems.......................................................... p.34
4.3 Electrical power supply............................................... p.35
4.4 Control system............................................................... p.35
4.5 Alarm indicator lamp................................................... p.37
4.6 Remote the board error reset................................... p.37
4.7 Temperature probes .................................................... p.37
5 First start-up .......................................................................... p.38
5.1 Preliminary checks........................................................ p.38
5.2 How to access the boiler............................................ p.38
5.3 Heat pump combustion parameters check......... p.39
5.4 Boiler combustion parameters check.................... p.40
5.5 Setting parameters for heat pump rst start-up
............................................................................................. p.41
5.6 Setting parameters for boiler rst start-up.......... p.44
5.7 Settings depending on the primary circuit
water pump type .......................................................... p.45
6 Normal operation.............................................................. p.46
6.1 Warnings.......................................................................... p.46
6.2 Switch on and o.......................................................... p.46
6.3 Messages on the heat pump display..................... p.46
6.4 On-board electronic controls – Menus and
parameters of the GHP10 board.............................. p.46
6.5 Modifying heat pump settings ................................ p.47
6.6 Restarting a locked-down unit................................. p.49
6.7 Messages on the boiler display................................ p.49
6.8 Boiler module heating temperature setting....... p.50
6.9 Eciency.......................................................................... p.50
7 Maintenance.......................................................................... p.51
7.1 Warnings.......................................................................... p.51
7.2 Pre-emptive maintenance......................................... p.51
7.3 Scheduled routine maintenance............................. p.52
7.4 Periods of inactivity...................................................... p.52
7.5 Temporary stop command of the fan.................... p.52
8 Diagnostics.............................................................................. p.54
8.1 Heat pump board codes............................................. p.54
8.2 Boiler board codes........................................................ p.56
8.3 Water pump alarm codes of heat pump module
............................................................................................. p.57
Appendices.............................................................................. p.58
Product che................................................................... p.58
INDEX OF CONTENTS

Introduction
4
I
I INTRODUCTION
Manual
This Manual is an integral part of the K18 Hybrigas unit
and must be handed to the end user together with the
appliance.
I.1 RECIPIENTS
This Manual is intended for:
▶ end user, for appropriate and safe use of the appliance;
▶ qualied installer, for correct appliance installation;
▶ planner, for specic information on the appliance.
I.2 CONTROL DEVICE
In order to work, the K18 Hybrigas unit requires a control device
to be connected by the installer (see Paragraph 1.8 p.21 ).
II SYMBOLS AND DEFINITIONS
II.1 KEY TO SYMBOLS
DANGER
WARNING
NOTE
PROCEDURE
REFERENCE (to other document)
II.2 TERMS AND DEFINITIONS
Appliance / Unit = equivalent terms, both used to refer to the
hybrid gas absorption group.
TAC = Technical Assistance Centre authorised by Robur.
External request = generic control device (e.g. thermostat, tim-
er or any other system) equipped with a voltage-free NO contact
and used as control to start/stop the unit.
Ambient chronothermostat OCDS007 = control device to con-
trol a K18 Hybrigas appliance.
OQLT019 system controller = control system to control a
K18 Hybrigas appliance, one or more heating circuits and DHW
production.
GUE (Gas Utilization Eciency) = eciency index of gas heat
pumps, equal to the ratio between the thermal energy pro-
duced and the energy of the fuel used (relative to LCV, lower
caloric value).
First Switch-On = appliance commissioning operation which
may only and exclusively be carried out by a TAC.
GHP10 Board = electronic board on the unit, to control all func-
tions and to provide interface with other devices and with the
user.
III WARNINGS
III.1 GENERAL AND SAFETY WARNINGS
Installer's qualications
Installation must exclusively be performed by a Qualied
Firm and by Skilled Personnel, with specic knowledge
on heating, cooling, electrical systems and gas applianc-
es, 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 reg-
ulations in force and the manufacturer's instructions/
provisions.
Misuse
The appliance must only be used for the purposes for
which it has been designed. Any other use is deemed
hazardous. Incorrect use may aect operation, duration
andsafety ofthe appliance.Adhere to themanufacturer's
instructions.
Use of the appliance by children
The device can be used by children over 8 years old,
and by people with reduced physical, sensory or mental
capabilities, or lack of experience or knowledge, only if
they are under surveillance or after they have received
instructions regarding safe use of the appliance and un-
derstanding the dangers inherent in it. Children should
not play with the appliance. Cleaning and maintenance
that must be performed by the user must not be per-
formed by unsupervised children.
Hazardous situations
Do not start the appliance in hazardous conditions, such
as: gas smell, problems with the plumbing/electrical/gas
system, parts of the appliance under water or damaged,
malfunctioning, disabling or bypassing control and safe-
ty devices.
In case of danger, request intervention by skilled person-
nel.
In case of danger, switch o the electrical power and gas
supplies only if this can be done in total safety.

Warnings
Installation, use and maintenance manual – K18 Hybrigas 5
III
Do not entrust children, persons with physical, sensory
or mental disabilities or persons with poor knowledge
and experience with use of the appliance.
Gas component tightness
Before performing any operation on gas ducting compo-
nents, close the gas cock.
Upon completing any procedure, perform the tightness
test according to regulations in force.
Gas smell
If you smell gas:
Do not use electrical devices such as telephones, mul-
timeters or other equipment that may cause sparks next
to the appliance.
Shut o the gas supply by turning the cock o.
Disconnect electrical power supply by means of the
external isolation switch in the power supply electrical
panel.
Use a telephone away from the appliance to ask for inter-
vention from skilled personnel.
Poisoning
Ensure the ue gas ducts are tightness and compliant
with the regulations in force.
Upon completing any procedure, ensure components
are tightness.
Moving parts
The appliance contains moving parts.
Do not remove guards during operation, and in any case
prior to disconnecting the power supply.
Burn hazard
The appliance contains very hot parts.
Do not open the appliance and do not touch internal
components before the appliance has cooled down.
Do not touch the ue gas exhaust before it has cooled
down.
Pressure vessels
The appliance has a sealed circuit classied as pres-
sure vessel, the tightness of which is tested by the
manufacturer.
Do not carry out any intervention on the sealed circuit or
on the appliance's valves.
Water-ammonia solution
The unit uses the ammonia-water absorption cycle. The
water-ammonia solution is contained in the tightness
circuit. The solution is harmful for health if it is ingested,
inhaled or comes in contact with the skin.
In the event of coolant leak keep away and disconnect
the power and gas supply (only if it is possible to do so
with no danger).
Request assistance from the TAC.
Electrocution hazard
Disconnect the electrical power supply before any work/
procedure on appliance components.
For electrical connections exclusively use compliant
components and according to the specications provid-
ed by the manufacturer.
Ensure the appliance cannot be accidentally switched
back on.
Earthing
Electrical safety depends on eective earthing system,
correctly connected to the appliance and installed ac-
cording to the regulations in force.
Distance from combustible or ammable materials
Do not store ammable materials (paper, solvents, paint,
etc.) in the vicinity of the appliance.
Limescale and corrosion
Depending on the chemical/physical properties of the
system water, limescale or corrosion may damage the
appliance (Paragraph 3.6 p.31 ).
Check system sealing.
Avoid frequent top-ups.
Chloride concentration
The concentration of chlorides or free chlorine in the
system water must not exceed the values in Table
3.2 p.31 .
Aggressive substances in air
Halogenated hydrocarbons containing chlorine and u-
orine compounds cause corrosion.The air of the installa-
tion site must be free from aggressive substances.
Acid ue gas condensate
Discharge the acid condensate of combustion ue gas,
as indicated in Paragraph 3.11 p. 33 , in compliance
with current exhaust regulations.
Switching the appliance o
Disconnecting the power supply while the appliance
is running may cause permanent damage to internal
components.
Except in the event of danger, do not disconnect the
power supply to switch o the appliance, but always
and exclusively act through the control device provided
(OQLT019, OCDS007, or external request).
In the event of failure
Operations on internal components and repairs may
exclusively be carried out by a TAC, only using original
parts.
In the event of failure of the appliance and/or breakage
of any component, do not attempt to repair and/or re-
store and immediately contact the TAC.
Routine maintenance
Proper maintenance assures the eciency and good op-
eration of the appliance over time.
Maintenance must be performed according to the

Warnings
6
III
manufacturer's instructions (see Chapter 7 p. 51 ) and
in compliance with current regulations.
Appliance maintenance and repairs may only be entrust-
ed to rms legally authorised to work on gas appliances
and systems.
Enter into a maintenance contract with an authorised
specialised rm for routine maintenance and for servic-
ing in case of need.
Only use original parts.
Decommissioning and disposal
If the appliance is to be disposed of, contact the manu-
facturer for its disposal.
Keep the Manual
This "Installation, Use and Maintenance Manual" must al-
ways accompany the appliance and must be handed to
the new owner or installer in the event of sale or removal.
III.2 CONFORMITY
EU Directives and standards
The absorption heat pumps of the K18 series are certied as
conforming to standard EN 12309 and comply with the essential
requirements of the following Directives:
▶ 2009/142/EC "Gas Appliances Directive" as amended and
added.
▶ 2014/30/EC "Electromagnetic Compatibility Directive" as
amended and added.
▶ 2014/35/EC "LowVoltage Directive" as amended and added.
▶ 2006/42/EC "Machine Directive" as amended and added.
▶ 2014/68/EU "Pressure Equipment Directive" as amended
and added.
▶ 811/2013/EU "Energy Related Products Directive" as amend-
ed and added.
▶ 813/2013/EU "Ecodesign requirements regulation" as
amended and added.
▶ 92/42/EEC "Eciency Directive" as amended and added.
▶ 2009/125/EC "Eco-design Directive" as amended and added.
▶ 2010/30/EC "Energy labelling" as amended and added.
Furthermore, they comply with the requirements of the follow-
ing standards:
▶ UNI EN 677 Specic requirements for condensing boilers
with nominal heating capacity up to 70 kW.
▶ EN 378 Refrigerating systems and heat pumps.
▶ UNI EN 483 Type C gas appliances with nominal thermal ca-
pacity not greater than 70 kW.
Other applicable provisions and standards
The design, installation, operation and maintenance of the sys-
tems shall be carried out in compliance with current applicable
regulations, depending on the Country and location, and in ac-
cordance with the manufacturer's instructions. In particular, reg-
ulations regarding the following shall be complied with:
▶ Gas systems and equipment.
▶ Electrical systems and equipment.
▶ Heating and air conditioning systems, and heat pumps.
▶ Environmental protection and combustion products ex-
haust.
▶ Fire safety and prevention.
▶ Any other applicable law, standard and regulation.
III.3 EXCLUSIONS OF LIABILITY AND
WARRANTY
Any contractual or extra-contractual liability of the man-
ufacturer for any damage caused by incorrect installa-
tion and/or improper use and/or failure to comply with
regulations and with the manufacturer's directions/in-
structions shall be disclaimed.
In particular, the warranty on the appliance may be ren-
dered void by the following conditions:
Incorrect installation.
Misuse.
Failure to comply with the manufacturer's indications on
installation, use and maintenance.
Alteration or modication of the product or any part
thereof.
Extreme operational conditions or however outside of
the operational ranges set forth by the manufacturer.
Damages caused by external agents such as salts, chlo-
rine, sulphur or other chemical substances contained in
the installation water or present in the air of the instal-
lation site.
Abnormal actions transmitted to the appliance by the
plant or installation (mechanical stresses, pressure, vi-
brations, thermal expansion, electrical surges...).
Accidental damages or due to force majeure.

Features and technical data
Installation, use and maintenance manual – K18 Hybrigas 7
1
1 FEATURES AND TECHNICAL DATA
The K18 Hybrigas is composed by a K18 heat pump module and
by a condensing boiler module.
1.1 FEATURES
1.1.1 Available range
A distinction must be made from the application perspective
based on the type of service provided:
A. Systems for space heating only;
B. Systems for space heating and DHW production (Domestic
Hot Water).
Systems for space heating and DHW production correspond to
the EVO version.
All K18 Hybrigas appliances are available both in the outdoor
installation version and in the indoor installation version.
Figure1.1Available range for the family of K18 systems
HEATING ONLY HEATING + DWH
GAS ABSORPTION
HEAT PUMP
INDOOR / OUTDOOR
K18 HYBRIGAS K18 HYBRIGAS EVO
K18
18 kW
K18
18 kW
+ CONDENSING
BOILER
Table1.1Selection guide
Heating only Heating + DHW
K18 Hybrigas
- aerothermal gas heat pump + condensing boiler
- built-in digital system, optimises the use of renewable energy; depending on
outdoor temperature, it regulates the operation in the most cost-eective and
ecological way possible
- monobloc, makes installation easier and reduces costs
- high peak thermal power with wide modulation
- heating capacity (burned) 29,2 kW
- delivered thermal power 37,9 kW
- indoor or outdoor versions
- use of aerothermal renewable energy for heating hot water production up to 65
°C
K18 Hybrigas EVO
- aerothermal gas heat pump + condensing boiler + system controller + 300-liter
DHW buer tank (optional)
- built-in digital system, optimises the use of renewable energy; depending on
outdoor temperature, it regulates the operation in the most cost-eective and
ecological way possible
- use of aerothermal renewable energy for heating hot water production up to 65
°C
- use of aerothermal renewable energy also for buer tank DHW production up
to 80 °C
- controlling secondary zone circuits (via the system controller)
- high thermal power
- heating capacity (burned) 29,2 kW
- delivered thermal power 37,9 kW
- indoor or outdoor versions
1.1.2 Characteristics of heat pump module
Operation
The K18 Hybrigas heat pump is based on the thermodynamic
water-ammonia absorption cycle (H20–NH3), and produces hot
water using outdoor air as a renewable energy source (cold
source) and natural gas as primary energy.
The thermodynamic cycle takes place within a hermetically
sealed circuit, in welded construction, perfectly tight, facto-
ry-tested, which does not require any maintenance or coolant
top-ups.
Mechanical and thermo-hydraulic components
▶ steel sealed circuit, externally treated with epoxy paint;
▶ sealed combustion chamber suitable for outdoor installa-
tions;
▶ burner equipped with ignition and ame detection device,
controlled by an electronic controller;
▶ titanium stainless steel shell-and-tube water exchanger;
▶ stainless steel, ue gas latent heat recovery exchanger;
▶ air exchanger with nned coil, with steel pipe and alumini-
um ns;
▶ automatic microprocessor-controlled nned coil automatic
defrosting valve;
▶ circulation pump.
Control and safety devices
▶ GHP10 electronic board with microprocessor, display and
selection keys;
▶ installation water owmeter;
▶ generator limit thermostat, with manual reset;
▶ ue gas temperature thermostat, with manual reset;
▶ sealed circuit safety relief valve;
▶ by-pass valve, between high and low pressure circuits;
▶ ame control board
▶ gas solenoid valve with double shutter;
▶ antifreeze function for water circuit;
▶ condensate discharge obstruction sensor.
1.1.3 Characteristics of condensing boiler module
Operation
The K18 Hybrigas Boiler is the condensing boiler module inte-
grating the K18 heat pump and it provides thermal power for
space heating (and DHW in case of K18 Hybrigas EVO) integrat-
ing the heat pump when required.
Mechanical and thermo-hydraulic components
▶ integrated spiral single tube stainless steel heat exchanger;

Features and technical data
8
1
▶ modulating premix burner with 1:9 ratio;
▶ automatic air purging valve;
▶ high eciency modulating water pump;
▶ system drain cock;
▶ heat circuit temperature probe;
▶ condensate drain siphon.
Control and safety devices
▶ ue safety thermal fuse;
▶ 3 bar safety valve;
▶ gas solenoid valve;
▶ safety thermostat;
▶ expansion tank;
▶ water dierential pressure switch.
1.1.4 Control of the two heat generators
A control system has been designed for the K18 Hybrigas unit,
called Armonia, which allows integration between the heat
pump module and the condensing boiler module (auxiliary
boiler) that compose the K18 Hybrigas unit, to be managed as
optimally as possible in order to provide the best performance
in terms of comfort and energy eciency.
Specically, as shown in Figure 1.2 p. 8 below, various cases
are possible:
A. very low load: active auxiliary boiler in modulation and
heat pump o (replacement at a particularly mild outdoor
temperature)
B. low load: active heat pump in modulation and auxiliary boil-
er o
C. average/high load: active heat pump at full power and active
auxiliary boiler in modulation (integration)
D. high load: maximum power for the operating condition to
be reached quicker (integration)
E. very high load: heat pump out of the operating limits and
auxiliary boiler that autonomously covers the design load
(replacement at low ambient temperature)
Figure1.2Armonia control system diagram
Tj [°C] outdoor temperature
PLRh(Tj) [%]plant partial load ratio at outdoor temperature Tj
A Heat pump o. Active auxiliary boiler in modulation.
B Active heat pump in modulation. Auxiliary boiler o.
C Active heat pump at full power. Active auxiliary boiler in modulation.
D Active heat pump at full power. Active auxiliary boiler at full power.
E Heat pump o. Active auxiliary boiler at full power.
100%
0% T j
20°C
A
B
CD
E
PLRh(Tj) [%]
In the presence of a minimal thermal demand (scenario A), the
minimum power of the heat pump could still be excessive in
comparison to the demand. In this case it may be advantageous
to use only the auxiliary boiler (replacement mode).
In the presence of low thermal demand (scenario B), only the
heat pump will be active in modulation mode, whereas the aux-
iliary boiler will be o.
As the thermal demand increases (scenario C), the heat pump
reaches full power and, if the thermal load still cannot be ful-
lled, it will activate the auxiliary boiler, which will run in mod-
ulation mode. The heat pump will still remain active and at full
power, and therefore the power of the auxiliary boiler will be
added to that of the heat pump (integration mode).
When the thermal demand is high (scenario D), for example
while the system reaches operating conditions, the heat pump
and auxiliary boiler will run at maximum power, reducing the
necessary time for the operating conditions to be reached and
ensuring the optimal comfort even in harsher environmental
conditions.
If the heating system design require the water tem-
perature to be higher than the maximum that can be
dispensed by the heat pump, in high thermal demand
conditions (scenario E), the auxiliary boiler can be acti-
vated as its replacement. In this type of application the
maximum thermal load of the building must be at most
equal to the power of the auxiliary boiler and not to the
sum of the power of the two appliances (replacement
mode).
The auxiliary boiler can therefore be operated in four ways (see
also Paragraph 5.5.5 p.43 ):
▶ inactive (the auxiliary boiler does not intervene in any way);
▶ emergency (the auxiliary boiler is only activated when there
is an alarm on the heat pump module);
▶ integration (active auxiliary boiler as necessary for

Features and technical data
Installation, use and maintenance manual – K18 Hybrigas 9
1
integration of the thermal power of the heat pump module,
scenarios B, C, and D);
▶ integration and replacement (just like in the integration
mode, with the addition that in particular environmental
conditions, the heat pump can be deactivated and only the
auxiliary boiler operates, scenarios A and E).

Features and technical data
10
1
1.2 DIMENSIONS
Figure1.3Dimensions K18 Hybrigas
A Front panel
B Left panel
C Electrical connection input
D Heat pump ue gas exhaust outlet Ø 80 mm
E Flue gas condensate and defrosting water drain Ø 20 mm
F Flue gas condensate and defrosting water discharge conveyor
G Boiler display transparent cover, which can be detached to access the user
interface keys
H Boiler reset/unlock button
I Heat pump display transparent cover, which can be detached to access
the user interface keys
J Heat pump reset/unlock button
K Boiler ue gas exhaust outlet Ø 80
375 8369
109
517
1348
1421
1448
1452
752
189
111
524
265
C
A
B
D
K
E F
G
H
I
J

Features and technical data
Installation, use and maintenance manual – K18 Hybrigas 11
1
1.3 CONNECTION PLATE DETAIL
Figure1.4Connection plate detail
A Water outlet connection Ø 3/4" M
B Water inlet connection Ø 3/4" M
F Boiler module safety valve discharge pipe passage
G Gas connection Ø 3/4" M

Features and technical data
12
1
1.4 COMPONENTS
Figure1.5LH front view
A Heat pump module
B Boiler module
B
A

Features and technical data
Installation, use and maintenance manual – K18 Hybrigas 13
1
Figure1.6LH front view heat pump module internal components
1 Fan
2 Flame sensing / ignition electrodes
3 PT1000 ue exhaust temperature probe
4 Limit thermostat
5 Defrosting valve
6 TA outdoor temperature probe
7 Teva evaporator temperature probe
8 Heat pump module delivery temperature probe
9 Components box
10 Circulation pump
67
1
9
4
5
3
10
8
2

Features and technical data
14
1
Figure1.7Heat pump module internal components rear view
1 Safety valve
2 Flowmeter
3 Heat pump module ue gas exhaust
4 Condensate discharge
5 Condensate level sensor
6 Water outlet connection Ø 3/4" M
7 Water inlet connection Ø 3/4" M
8 Return temperature probe
9 120 °C ue gas thermostat
1
3
9
2
7
68
4
5

Features and technical data
Installation, use and maintenance manual – K18 Hybrigas 15
1
Figure1.8RH front view heat pump module internal components
1 Gas valve
2 Combustion blower
3 Ignition transformer
4 Oil pump
5 TG generator temperature probe
6 Electrical panel
7 TGV probe
6
4
3
2
7
1
5

Features and technical data
16
1
Figure1.9LH side view
A Boiler module ue gas exhaust outlet
B Heat pump module ue gas exhaust outlet
C Socket for boiler ue gas analisys
D Boiler module combustion air inlet
C
A
B
D

Features and technical data
Installation, use and maintenance manual – K18 Hybrigas 17
1
Figure1.10Detail of water pipes connection between boiler module and connection plate
A Heating water outlet pipe
B Heating water inlet pipe
G Gas pipe
S Space heating water delivery temperature probe
V Boiler module safety valve drain ducting pipe
(to be tted by the installer)
BV
S
A
G

Features and technical data
18
1
1.5 ELECTRICAL WIRING DIAGRAM
Figure1.11Heat pump module wiring diagram
SCH GHP10 electronic board
CNTBOX Flame controller
BLW Blower
PM Water pump
PMP Oil pump
IGNTR Ignition transformer
IGN Ignition electrodes
FLS Flame sensor
LS Gas valve ON indicator lamp
GV Gas solenoid valve
TC Manual ue gas thermostat
TL Generator limit thermostat
FM Flowmeter
CWS Condensate water sensor
VD Defrosting valve
FAN Fan
THMC Hot water ow temperature
probe
THRC Hot water return temperature
probe
TA Ambient air temperature sensor
TG Generator temperature sensor
TEVA Evaporator outlet temperature
sensor
TGV Gas valve probe
TF PT1000 ue gas temperature
probe
REED Oil pump rotation sensor

Features and technical data
Installation, use and maintenance manual – K18 Hybrigas 19
1
Figure1.12Boiler module wiring diagram
ER Detection electrode
EA Ignition electrode
PM Modulating water pump
VG Gas valve
TRA Ignition transformer
TR Transistor
SRi System return probe
TS Safety thermostat
Pacq Water pressure switch
EV Blower
SR Space heating probe
TF Flue gas thermofuse (102 °C)
SE Connector for optional outdoor
temperature probe
MP Control panel terminal block
L Line
N Neutral
ne Black
gi-ve Green-yellow
bl Blue
ro Red
ce Light blue
ma Brown
ar Orange
gi Yellow
bi White
gr Grey
ve Green
+24V
HS
PWM
GND
ce
ma
ar ar
44 43 42 41 40
39 38
37 36 35 34 33 32
ce
ma ma
ce
31 30
29 28
27 26
ma
ce
L
MP
PM
gi
ve
bi
ma
gi-ve
bl
ma
TR
13
ER
gr
ma
ce
ma
ce
4
1
2
3
M10
Tra
SRi
ma
ce
M15
62
63
64
65
66
67
68
ma
bi gi
gr 57
61
60
59
58
M16
M14
51
52
53
54
55
56
M13
M12 M9 M7 M5
VG
12
13
14
15
16
17
M2
ce
ma
ce
ma
56
M8
EA
7 8 9
EV TF
TS
SR
SE
Pacq
10 11 M4
ro
NOAL +AL 0 +10

Features and technical data
20
1
Figure1.13Detail of connection between heat pump module electrical panel and boiler module electrical panel
A Heat pump module electric panel
B Boiler module electric panel
1.6 ELECTRONIC BOARD
The appliance's electrical panel contains:
▶ ElectronicBoardGHP10withmicroprocessor,it controlsthe
appliance and displays data, messages and operative codes.
The appliance is monitored and programmed by interacting
with the display and selection keys (Figure 1.14 p.20 ). The
display is accessible from the right side of the unit (detail I
Figure 1.3 p.10 ).
Figure1.14GHP10 board display
A Display
B Left selection key
C Right selection key
D Enter / Access menu key
E RS232 connector
F Chimney sweep function for heat pump module