Robur K18 Simplygas User manual

Installation, Use and
Maintenance Manual
K18
Nominal thermal capacity 18,9 kW
Modulating, condensing gas absorption heat pump, using aerothermal
renewable energy and natural gas

Revision: A - 3.1
Code: D-LBR687
This Manual has been drawn up and printed by Robur Robur S.p.A.; whole or partial reproduction of this Manual is
forbidden.
The original is led at Robur S.p.A.
Any use of this Manual other than for personal referencing 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 improving the quality of its products, Robur S.p.A. reserves the right to modify the data and
contents of this Manual without prior notice.

Installation, Use and Maintenance Manual – K18
3
INDEX OF CONTENTS
I INTRODUCTION...............................................4
II SYMBOLS AND DEFINITIONS.........................4
II.1 Key to symbols......................................................................4
II.2 Terms and denitions.........................................................4
III WARNINGS.......................................................4
III.1 General and safety warnings...........................................4
III.2 Conformity .............................................................................6
III.3 Exclusions of liability and warranty...............................6
1 FEATURES AND TECHNICAL DATA ................7
1.1 Features...................................................................................7
1.2 Dimensions ............................................................................8
1.3 Components..........................................................................9
1.4 Electrical wiring diagram ............................................... 12
1.5 Electronic boards .............................................................. 13
1.6 Operation mode................................................................ 14
1.7 Controls ................................................................................ 14
1.8 Technical characteristics................................................. 15
2 TRANSPORT AND POSITIONING .................16
2.1 Warnings.............................................................................. 16
2.2 Handling............................................................................... 16
2.3 Appliance positioning..................................................... 17
2.4 Minimum clearance distances...................................... 17
2.5 Mounting base................................................................... 17
3 HEATING ENGINEER......................................18
3.1 Warnings.............................................................................. 18
3.2 Installation........................................................................... 18
3.3 Hydraulic connections .................................................... 18
3.4 Water circulation pump.................................................. 19
3.5 Anti-icing function............................................................ 19
3.6 Anti-icing liquid................................................................. 19
3.7 System water quality ....................................................... 20
3.8 Installation lling .............................................................. 20
3.9 Fuel gas supply .................................................................. 20
3.10 Combustion products exhaust .................................... 21
3.11 Flue gas condensate discharge.................................... 21
3.12 Defrosting water drainage............................................. 22
4 ELECTRICAL INSTALLER ...............................22
4.1 Warnings.............................................................................. 22
4.2 Electrical systems.............................................................. 22
4.3 Electrical power supply................................................... 22
4.4 Set-up and control............................................................ 23
4.5 Water circulation pump.................................................. 25
4.6 How to connect the alarm indicator lamp............... 25
4.7 How to remote the board error reset......................... 26
5 FIRST STARTUP ............................................26
5.1 Preliminary checks............................................................ 26
5.2 Check combustion parameters.................................... 27
6 NORMAL OPERATION...................................28
6.1 Warnings.............................................................................. 28
6.2 Switch on and o.............................................................. 28
6.3 Messages on the display ................................................ 28
6.4 On-board electronic controls – Menus and
parameters of the GHP10 board.................................. 28
6.5 Modifying settings............................................................ 29
6.6 Restarting a locked-out unit - Reset........................... 32
6.7 Eciency.............................................................................. 32
7 MAINTENANCE..............................................32
7.1 Warnings.............................................................................. 32
7.2 Pre-emptive maintenance............................................. 33
7.3 Scheduled routine maintenance................................. 33
7.4 Periods of inactivity.......................................................... 33
8 DIAGNOSTICS................................................34
8.1 Operative codes................................................................. 34
APPENDICES........................................................36
1 Declaration of Conformity............................................. 36

I Introduction
4
I INTRODUCTION
Manual
This Manual is an integral part of the K18 unit and must
be handed to the end user together with the appliance.
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.
Control device
In order to work, the unit K18requires a control device to be con-
nected by the installer (see Paragraph 1.7p.14).
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 designate the
gas powered absorption heat pump.
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.
OCDS005 Room timer thermostat = control device to control
an appliance K18.
OQLT017 System controller = control system to control an ap-
pliance K18 and possibly an additional boiler. It is also able to
control room comfort and DHW production.
Heat generator = equipment (e.g. boiler, heat pump, etc..) pro-
ducing heating and/or DHW.
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 start-up = appliance commissioning operation which may
only and exclusively be carried out by aTAC.
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 knowl-
edge on heating, cooling, electrical systems and gas
appliances, 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
and safety of the appliance. Adhere to the manufactur-
er's instructions.
Hazardous situations
▶ Do not start the appliance in hazardous conditions,
such as: gas smell, problems with the plumbing/elec-
trical/gas system, parts of the appliance under water
or damaged, malfunctioning, disabling or bypassing
control and safety devices.
▶ In case of danger, request intervention by skilled
personnel.
▶ In case of danger, switch o the electrical power and
gas supplies only if this can be done in total safety.
▶ Do not entrust children,personswith physical,senso-
ry or mental disabilities or persons with poor knowl-
edge and experience with use of the appliance.
Gas component tightness

III Warnings
Installation, Use and Maintenance Manual – K18
5
▶ Before performing any operation on gas ducting
components, close the gas cock.
▶ Upon completing any procedure, perform the tight-
ness test according to regulations in force.
Gas smell
If you smell gas:
▶ Do not use electrical devices such as telephones,
multimeters 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 electri-
cal panel.
▶ Use a telephone away from the appliance to ask for
intervention from skilled personnel.
Poisoning
▶ Ensure the ue gas ducts are tightness and compli-
ant with the regulations in force.
▶ Upon completing any procedure, ensure compo-
nents 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 cir-
cuit or on the appliance's valves.
Water-ammonia solution
The K18 unit uses the ammonia-water absorption cycle.
The water-ammonia solution is contained in the tight-
ness circuit. The solution is harmful for health if it is in-
gested, inhaled or comes in contact with the skin.
▶ In the event of coolant leak keep away and discon-
nect 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 pro-
vided 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 3.7p.20).
▶ Check system tightness.
▶ 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.20.
Aggressive substances in air
Halogenated hydrocarbons containing chlorine and
uorine compounds cause corrosion. The supply/venti-
lation air of the appliance 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. 21, in com-
pliance 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 al-
ways and exclusively act through the control device
provided.
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 break-
age of any component, do not attempt to repair and/
or restore and immediately contact the TAC.
Routine maintenance

III Warnings
6
Proper maintenance assures the eciency and good
operation of the appliance over time.
▶ Maintenance must be performed according to the
manufacturer's instructions (see Chapter 7 p. 32)
and in compliance with current regulations.
▶ Appliance maintenance and repairs may only be en-
trusted to rms legally authorised to work on gas ap-
pliances and systems.
▶ Enter into a maintenance contract with an author-
ised specialised rm for routine maintenance and for
servicing 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
always 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 GAHP 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.
▶ 2004/108/EC "Electromagnetic Compatibility Directive" as
amended and added.
▶ 2006/95/EC "LowVoltage Directive" as amended and added.
▶ 2006/42/EC "Machine Directive" as amended and added.
▶ 97/23/EEC "Pressure Equipment Directive" 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.
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
accordance with the manufacturer's instructions. In particular,
regulations 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
manufacturer for any damage caused by incorrect in-
stallation and/or improper use and/or failure to comply
with regulations and with the manufacturer's direc-
tions/instructions 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 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
manufacturer.
▶ Damages caused by external agents such as salts,
chlorine, sulphur or other chemical substances con-
tained in the installation water or present in the air of
the installation site.
▶ Abnormal actions transmitted by the plant or instal-
lation to the appliance (mechanical stresses, pres-
sure, vibrations, thermal dilations, power surges...).
▶ Accidental damages or due to force majeure.

III Warnings
Installation, Use and Maintenance Manual – K18
7
1 FEATURES AND TECHNICAL DATA
1.1 FEATURES
Operation
Based on the thermodynamic water-ammonia absorption cycle
(H20–NH3), the appliance 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 tightness, fac-
tory-tested, which does not require any maintenance or refriger-
ant top-ups.
Mechanical and thermo-hydraulic components
▶ steel sealed circuit, externally treated with epoxy paint;
▶ sealed combustion chamber (type C) suitable for outdoor
installations;
▶ 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;
▶ standard supplied circulation pump in version C1 (standard).
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;
▶ ionisation ame controller;
▶ gas solenoid valve with double shutter;
▶ anti-icing function for water circuit;
▶ condensate discharge obstruction sensor.

III Warnings
8
1.2 DIMENSIONS
Figure 1.1 – Dimensions and service plate
B
A
C
H
G
L
E
F
LEGEND
A Water outlet connection Ø ¾’’M
B Water inlet connection Ø ¾’’M
C Gas connection Ø 3/8’’M
D Electrical connection input
E Flue gas outlet Ø 60
F Flue gas condensate drain
G Defrosting water drain
H Green warning light
L Sight glass

III Warnings
Installation, Use and Maintenance Manual – K18
9
1.3 COMPONENTS
Figure 1.2 – LH front view internal components












LEGEND
1 Fan
2 Ignitor and ame detector
3 PT 1000 Flue gas Temperature Probe
4 Limit thermostat
5 Defrosting valve
6 TA Probe
7 Teva Probe
8 Combustion air inlet
9 Delivery temperature probe
10 Components box
11 Standard circulation pump in version
C1 (standard)

III Warnings
10
Figure 1.3 – Rear view internal components










LEGEND
1 Safety valve
2 Flow meter
3 Flue gas discharge Ø 60mm
4 Condensate drain
5 Condensate sensor
6 Water delivery connection: "G 3/4" M
7 Water inlet connection: "G 3/4" M
8 Inlet temperature probe
9 120 °C thermal fuse

III Warnings
Installation, Use and Maintenance Manual – K18
11
Figure 1.4 – RH front view internal components







LEGEND
1 Gas valve
2 Blower
3 Ignition transformer
4 Oil pump
5 TG Probe
6 Electrical panel
7 Sonda TGV

III Warnings
12
1.4 ELECTRICAL WIRING DIAGRAM
Figure 1.5 – Wiring diagram of the appliance with water pump (C1 version)
LEGEND
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
FS Condensate drain heating element
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
TK Condensate discharge heating element
thermostat
MA Terminal block
REED Oil pump rotation sensor

III Warnings
Installation, Use and Maintenance Manual – K18
13
Figure 1.6 – Wiring diagram of the appliance without water pump
LEGEND
SCH GHP10 electronic board
CNTBOX Flame controller
BLW Blower
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
FS Condensate drain heating element
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
TK Condensate discharge heating element
thermostat
MA Terminal block
REED Oil pump rotation sensor
1.5 ELECTRONIC BOARDS
The appliance's electrical panel contains:
▶ ElectronicBoardGHP10withmicroprocessor, itcontrolsthe
appliance and displays data, messages and operative codes.
The appliance is monitored and programmed by interacting
with the display and selection keys (Figure 1.7p.14).

III Warnings
14
Figure 1.7 – GHP10 board display











1.6 OPERATION MODE
The appliance K18 works in MODULATING mode.
The operating mode depends on parameter 181 of
board GHP10. By default the operating mode is set to
"MODULATING". For any modications contact the in-
staller or the TAC.
1.7 CONTROLS
Control device
The appliance may only work if it is connected to a control de-
vice, selected from:
▶ (1) OQLT017 System controller
▶ (2) OCDS005 Room timer thermostat
▶ (3) external request
1.7.1 Control system (1) with OQLT017
The OQLT017 controller is able to control one unit K18 plus a
possible additional boiler. It is also able to control room comfort
and DHW production.
OQLT017 System controller
The main functions are:
▶ control of one unit K18 with variable water set point accord-
ing to heating curves and type of DHW function;
▶ control of a possible additional boiler;
▶ room comfort control by controlling two heating circuits, of
which one optionally of mixed type, or zone valve control;
control based on heating curves (one for each circuit) and
optionally inuence by the installed room unit/s;
▶ buer tank DHW production control (in dedicated prepara-
tion tank);
▶ parameter gures display and setting;
▶ hourly programming on a weekly basis on three tempera-
ture levels (comfort, reduced, anti-icing protection);
▶ absence periods programming;
▶ diagnostics;
▶ reset errors.
For additional details and diagrams see Manual OQLT017.
1.7.2 Control system (2) with OCDS005
The OCDS005 timer thermostat is able to control a single unit
K18. In this case the water setpoint is xed or calculated based
on one heating curve only directly controlled by the unit K18; it
is not modiable by the OCDS005 device.
OCDS005 Room timer thermostat
The main functions are:
▶ room timer thermostat for hourly programming on a weekly
basis on various levels of room temperature;
▶ interfacing with the unit K18 through voltage-free request
contact.
For more information refer to Manual OCDS005.
1.7.3 Control system (3) with external request
The appliance may also be controlled via generic enable de-
vices (e.g. thermostats, timer, buttons, contactors...) tted with
voltage-free NO contact. This system only provides elementary
control (on/o, with xed set-point temperature). It is advisable
to possibly limit its use to simple applications only.
For connection of the selected device to the appliance's
electronic board please refer to Paragraph 4.4p.23.
LEGEND
A Display
B Selection keys
C Enter / Access menu
D RS232

III Warnings
Installation, Use and Maintenance Manual – K18
15
1.8 TECHNICAL CHARACTERISTICS
Table 1.1 – K18 Technical data
K18
HEATING MODE
OPERATING POINT A7W50 G.U.E. gas usage eciency % 157 (1)
Thermal power kW 17,6 (1)
OPERATING POINT A7W35 G.U.E. gas usage eciency % 169 (1)
Thermal power kW 18,9 (1)
Heating capacity MAXIMUM kW 11,2
Hot water delivery temperature maximum for heating °C 65
maximum for DHW °C 70
Hot water inlet temperature
maximum heating °C 55
maximum for DHW °C 60
minimum temperature in continuous operation °C 20 (5)
Hot water ow rate
nominal l/h 1000
maximum l/h 2000
minimum l/h 400
Hot water pressure loss at nominal water ow (A7W35) bar 0,14
ELECTRICAL SPECIFICATIONS
Power supply
Voltage V 230
TYPE SINGLE PHASE
Frequency 50 Hz supply 50
Electrical power absorption nominal w 280 (4)
Degree of protection IP 25
INSTALLATION DATA
Mains gas pressure (G20) mbar 17 - 25 (6)
gas consumption metano G20 (massimo) m3/h 1,2 (2)
Maximum water pressure in operation bar 4
Maximum ow ue condensate l/h 1,5
Defrosting water ow maximum l/min 0,2
Water content inside the apparatus l 1
Water tting TYPE M
thread " G 3/4
Gas connection TYPE M
thread " G 3/8
Fume outlet Dimensions mm 60
Residual head Pa 40
Dimensions
width mm 1146
depth mm 630 (3)
height mm 1330
Weight In operation kg 230
Pump data (only for C1 versions)
Maximum head m a.c. 7,5
Residual head m a.c. 4,0
Nominal ow at the max.available head l/h 1500
Maximum electrical consumption w 75
GENERAL INFORMATION
INSTALLATION MODE B23P - B53P
REFRIGERANT FLUID AMMONIA R717 kg 5,2
WATER H2O kg 6,8
MAXIMUM PRESSURE OFTHE REFRIGERANT CIRCUIT bar 32
Note:
(1) As per standard EN12309-2
(2) PCI (G20) 34,02 MJ/m3 (1013mbar 15 °C)
(3) Clearance dimensions without ue gas exhaust duct
(4) The data excluded electrical consumption of the standard tted pump (75W)
(5) Lower temperatures are admitted temporarily
(6) The LPG version is available on request

2 Transport and positioning
16
Table 1.2 – PED data
K18
PED data
COMPONENTS UNDER PRESSURE
Generator l 18,2
Cooling volume transformer l 3,0
Absorber/condenser l 2,2
Cooling absorber solution l 1.78
Solution pump l 2,8
TEST PRESSURE (IN AIR) bar g 55
MAXIMUM PRESSURE OFTHE REFRIGERANT CIRCUIT bar g 32
FILLING RATIO kg of NH3/l 0,186
FLUID GROUP GROUP 1°
2 TRANSPORT AND POSITIONING
2.1 WARNINGS
Damage from transport or installation
The manufacturer shall not be liable for any damage
during appliance transport and installation.
On-site inspection
▶ Upon arrival at the site, ensure there is no transport
damage on packing, metal panels or nned coil.
▶ After removing the packing materials, ensure the ap-
pliance is intact and complete.
Packing
▶ Only remove the packing after placing the appliance
on site.
▶ Do not leave parts of the packing within the reach of
children (plastic, polystyrene, nails...) since they are
potentially dangerous.
Weight
▶ The lifting equipment must be suitable for the load.
▶ Do not stand under suspended loads.
2.2 HANDLING
Handling and lifting
▶ Always handle the appliance in its packing, as delivered by
the factory.
▶ Use slings to lift the appliance.
▶ Use lifting beams to avoid damaging the outer panels and
nned coil (Figure 2.1p.16).
▶ Comply with safety regulations at the installation site.
Figure 2.1 – Instruction for lifting
In the event of handling with forklift or pallet truck,
comply with the handling instructions shown on the
packing.
Pay attention to the centre of gravity of the unit which is
o its centre (Figure 2.2p.17).

2 Transport and positioning
Installation, Use and Maintenance Manual – K18
17
Figure 2.2 – Unit centre of gravity position
2.3 APPLIANCE POSITIONING
Do not install inside a room
The appliance is type-approved for external installation.
▶ Do not install inside a room, not even if it has
openings.
▶ In no event start the appliance inside a room.
Unit ventilation K18
The aerothermal appliance requires a large space, ven-
tilated and free from obstacles, to enable smooth ow
of air to the nned coil and free air extraction from the
fan outlet, with no air recirculation. Incorrect ventilation
may aect eciency and cause damage to the appli-
ance. The manufacturer shall not be liable for any incor-
rect choices of the place and setting of installation.
Where to install the appliance
▶ The appliance may be installed at ground level, on a terrace
or on a roof, compatibly with its dimensions and weight.
▶ It must be installed outside buildings, in an area of natural air
circulation, outside the dripping path of drainpipes or simi-
lar. It does not require protection from weathering.
▶ No obstruction or structure must hinder the air ow from the
fan, nor ue gas exhaust.
▶ The appliance's ue gas exhaust must not be immediately
close to openings or air intakes of buildings, and must com-
ply with environmental regulations.
▶ Do not install near the exhaust of ues, chimneys or hot
polluted air. In order to work correctly, the appliance needs
clean air.
Install the appliance so the external pipes are as short as
possible, complying with minimum required distances
(Paragraph 2.4p.17).
Defrosting water drainage
In winter, it is normal for frost to form on the nned coil
and for the appliance to perform defrosting cycles.
▶ To prevent overowing and damage provide for a
drainage system.
Acoustic issues
▶ Pre-emptively assess the appliance's sound eect in connec-
tion to the site, taking into account that building corners, en-
closed courtyards, restricted spaces may amplify the acous-
tic impact due to the reverberation phenomenon.
2.4 MINIMUM CLEARANCE DISTANCES
Distances from combustible or ammable materials
▶ Keep the appliance away from combustible or ammable
materials or components, in compliance with applicable
regulations.
Clearances around the appliance
The minimum clearance distances shown in Figure 2.3 p. 17
(barring any stricter regulations) are required for safety, opera-
tion and maintenance.
Figure 2.3 – Minimum clearance distances
A
B
C
D
LEGEND
A 500 mm
B 300 mm
C 500 mm
D 1500 mm
Unit top view
2.5 MOUNTING BASE
Mounting base constructive features
▶ Place the appliance on a levelled at surface made of re-
proof material and able to withstand its weight.

3 Heating engineer
18
(1) - installation at ground level
▶ Failing a horizontal supporting base, make a at and levelled
concrete base, at least 100-150 mm larger than the appli-
ance dimensions per side.
(2) - installation on terrace or roof
▶ The structure of the building must support the total weight
of the appliance and the supporting base.
▶ If necessary, provide a maintenance walkway around the ap-
pliance.
Anti vibration mountings
Although the appliance's vibrations are minimal, resonance
phenomena might occur in roof or terrace installations.
▶ Use vibration damper supports (available as optional fea-
tures).
▶ Also provide anti-vibration joints between the appliance
and water and gas pipes.
3 HEATING ENGINEER
3.1 WARNINGS
General warnings
Read the warnings in Chapter III p. 4, providing im-
portant information on regulations and on safety.
Compliance with installation standards
Installation must comply with applicable regulations in
force, based on the installation Country and site, in mat-
ters of safety, design, implementation and maintenance
of:
▶ heating systems;
▶ cooling systems;
▶ gas systems;
▶ ue gas exhaust;
▶ ue gas condensate discharge.
Installation must also comply with the manufacturer's
provisions.
3.2 INSTALLATION
Primary and secondary circuit
▶ In many cases it is advisable to divide the hydraulic system
into two parts, primary and secondary circuit, uncoupled by
a hydraulic separator, or possibly by a tank that also acts as
inertial volume/thermal inertia.
Constant ot variable water ow
The unit K18 may operate with constant or variable water ow.
System and components must be designed and installed
consistently.
Minimum water content
High thermal inertia is conducive to ecient appliance opera-
tion. Very short ON/OFF cycles are to be avoided.
▶ If necessary, provide for an inertial volume, to be suitably
sized.
3.3 HYDRAULIC CONNECTIONS
Plumbing ttings
on the left, at the bottom, connection plate (Figure 1.1p.8).
▶ A (= in) 3/4" M - WATER INPUT (r = inlet from the system) ;
▶ B (= out) 3/4" M - WATER OUTPUT (m = outlet to the system).
Hydraulic pipes, materials and features
▶ Use pipes for heating/cooling systems, protected from
weathering, insulated for thermal dispersion.
Pipe washing
▶ Before connecting the appliance,accurately wash
the water and gas piping and any other system com-
ponent, removing any residue.
Minimum components of primary plumbing circuit
▶ Always provide, near the appliance:
on water piping, both output and input (m/r)
▶ 2 ANTIVIBRATION JOINTS on water ttings;
▶ 2 PRESSURE GAUGES;
▶ 2 ISOLATION BALL VALVES;
on the input water piping (r)
▶ 1 SEPARATOR FILTER;
▶ 1 FLOW REGULATION VALVE;
▶ 1 WATER CIRCULATION PUMP, with ow side towards the
group (ONLY to be provided in versions without in-built
pumps);
on the output water piping (m)
▶ 1 SAFETY VALVE (3 bar);
▶ 1 EXPANSION TANK of the individual unit

3 Heating engineer
Installation, Use and Maintenance Manual – K18
19
Figure 3.1 – Unit water diagram with built-in pump
Figure 3.2 – Unit water diagram without built-in pump
3.4 WATER CIRCULATION PUMP
The appliances in C1 version (standard) are equipped with a vari-
able ow circulation pump. For the data of the pump, refer to
Table 1.1p.15.
For units without in-built circulation pump, the pump (ow and
head) must be selected and installed based on pressure losses
of water/primary circuit (piping + components + exchange ter-
minals + appliance).
For the appliance's pressure losses refer toTable 1.1p.15.
(1) CONSTANT FLOW circulating pump
The circulating pump must be obligatorily controlled by the ap-
pliance's electronic board (GHP10) (see Paragraph4.5.1p.25).
(2) VARIABLE FLOW circulating pump
For variable ow operation, use of a Wilo Stratos Para pump is
obligatory , supplied as accessory on demand, to be connected
to the GHP10 electronic board (see Paragraph 4.5.2p.25).
3.5 ANTIICING FUNCTION
Active anti-icing self-protection
The appliance is equipped with an active antifreeze self-protec-
tion system to prevent icing. The anti-icing function (activated
by default) automatically starts the primary circulation pump
and, if required, the burner too, when the outside temperature
approaches zero.
Electrical and gas continuity
The active anti-icing self-protection is only eective
if the power and gas supplies are assured. Otherwise,
anti-icing liquid might be required.
3.6 ANTIICING LIQUID
Precautions with glycol
The manufacturer disclaims any liability for any damage
caused by improper glycol use.
▶ Always check product suitability and its expiry date
with the glycol supplier. Periodically check the prod-
uct's preservation state.
▶ Do not use car-grade anti-icing liquid (without inhib-
itors), nor zinc-coated piping and ttings (incompat-
ible with glycol).
▶ Glycol modies the physical properties of water (den-
sity, viscosity, specic heat...). Size the piping, circula-
tion pump and thermal generators accordingly.
▶ With automatic system water lling, a periodic check
of the glycol content is required.
With high glycol percentage (> 20…30%)
If the glycol percentage is ≥30% (for ethylene glycol) or
≥20% (for propylene glycol) theTAC must be alerted be-
fore rst start-up.
LEGEND
1 Anti-vibration connection
2 Pressure gauge
3 Flow regulation valve
4 Water lter
5 Isolation valves
6 Safety valve (3 bar)
7 Expansion tank
8 Hydraulic separator / 4-pipe buer tank
9 Water pump (secondary circuit)
10 Control device
LEGEND
1 Anti-vibration connection
2 Pressure gauge
3 Flow regulation valve
4 Water lter
5 Isolation valves
6 Safety valve (3 bar)
7 Expansion tank
8 Hydraulic separator / 4-pipe buer tank
9 Water pump (secondary circuit)
10 Control device
11 Water pump (primary circuit)

3 Heating engineer
20
Type of anti-icing glycol
Inhibited type glycol is recommended to prevent oxidation
phenomena.
Glycol eects
The Table 3.1 p. 20 shows, indicatively, the eects of using a
glycol depending on its %.
Table 3.1 – Technical data for lling the hydraulic circuit
GLYCOL % 10 15 20 25 30 35 40
WATER-GLYCOL MIXTURE FREEZING TEMPERATURE -3°C -5°C -8°C -12°C -15°C -20°C -25°C
PERCENTAGE OF INCREASE IN PRESSURE DROPS -- 6% 8% 10% 12% 14% 16%
LOSS OF EFFICIENCY OF UNIT -- 0,5% 1% 2% 2,5% 3% 4%
3.7 SYSTEM WATER QUALITY
Responsibility of the user/operator/installer
The installer, operator and user must assure system wa-
ter quality (Table 3.2p.20). Failure to comply with the
manufacturer's guidelines may aect operation, integ-
rity and life of the appliance, voiding the warranty.
Table 3.2 – Chemical and physical parameters of water
CHEMICAL AND PHYSICAL PARAMETERS OF WATER IN HEATING/COOLING
SYSTEMS
PARAMETER UNIT OF
MEASUREMENT ALLOWABLE RANGE
pH \ >7 (1)
Chlorides mg/l < 125 (2)
Total hardness (CaCO3)
°f < 15
°d < 8.4
Iron mg/kg < 0.5 (3)
Copper mg/kg < 0.1 (3)
Aluminium mg/l < 1
Langelier’s index \ 0-0,4
HARMFUL SUBSTANCES
Free chlorine mg/l < 0.2 (3)
Fluorides mg/l < 1
Sulphides ABSENT
1 with aluminium or light alloys radiators, pH must also be low-
er than 8 (in compliance with applicable rules)
2 value referred to the maximum water temperature of 80 °C
3 in compliance with applicable rules
System water features
Free chlorine or water hardness may damage the appliance.
Adhere to the chemical-physical parameters in Table 3.2 p.20
and the regulations on water treatment for residential and in-
dustrial heating systems.
Water topping up
The chemical-physical properties of the system's water may alter
over time, resulting in poor operation or excessive topping up.
▶ Ensure there are no leaks in the installation.
▶ Periodically check the chemical-physical parameters of the
water, particularly in case of automatic topping up.
Chemical conditioning and washing
Water treatment/conditioning or system washing car-
ried out carelessly may result in risks for the appliance,
the system, the environment and health.
▶ Contact specialised rms or professionals for water
treatment or system washing.
▶ Check compatibility of treatment or washing prod-
ucts with operating conditions.
▶ Do not use aggressive substances for stainless steel
or copper.
▶ Do not leave washing residues.
3.8 INSTALLATION FILLING
How to ll up the system
After completing all water, electrical and gas
connections:
1. Pressurise (at least 1.5 bar) and vent the hydraulic
circuit.
2. Circulate water.
3. Check and clean the lter on the inlet pipe.
4. Repeat items 1, 2 and 3. until the pressure has stabi-
lised (at least 1.5 bar).
3.9 FUEL GAS SUPPLY
Gas connection
▶ 3/8" M
on the right, at the bottom (Figure 1.1p.8).
▶ Install an anti-vibration connection between the appliance
and the gas piping.
Mandatory shut-o valve
▶ Provide a gas shut-o valve (manual) on the gas supply line,
to isolate the appliance when required.
▶ Perform connection in compliance with applicable regula-
tions.
Gas pipes sizing
The gas pipes must not cause excessive load losses and, conse-
quently, insucient gas pressure for the appliance.
Supply gas pressure
The appliance's gas supply pressure, both static and dynamic,
must comply with Table 1.1p.15, with tolerance ± 15%.
Non compliant gas pressure (Table 1.1 p. 15) may
damage the appliance and be hazardous.
Vertical pipes and condensate
▶ Vertical gas pipes must be tted with siphon and discharge
of the condensate that may form inside the pipe.
▶ If necessary, insulate the piping.