Robur Next-G 20 Service manual

Condensing gas unit heaters
for use in industrial and commercial installations
Powered by natural gas/LPG
Next-G
Installation, use and maintenance manual

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.
Revision: D
Code: D-LBR881EN
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.
The original is led at Robur S.p.A.
Any use of this Installation, use and maintenance 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, use and maintenance manual without prior notice.

Installation, use and maintenance manual – Next-G 3
I Introduction.......................................................................... p.4
I.1 Recipients................................................................ p.4
I.2 Control device ....................................................... p.4
I.3 Available languages ............................................ p.4
II Symbols and denitions......................................... p.4
II.1 Key to symbols ...................................................... p.4
II.2 Terms and denitions ......................................... p.4
III Warnings................................................................................... p.4
III.1 General and safety warnings............................ p.4
III.2 Compliance............................................................. 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.8
1.3 Components......................................................... p.17
1.4 Electronic board.................................................. p.18
1.5 Operation mode ................................................. p.18
1.6 Controls.................................................................. p.19
1.7 Technical data...................................................... p.22
2 Transport and positioning.................................. p.24
2.1 Warnings................................................................ p.24
2.2 Handling and lifting .......................................... p.24
2.3 Appliance positioning ...................................... p.24
2.4 Minimum clearance distances....................... p.25
2.5 Support bracket.................................................. p.25
3 Heating engineer........................................................... p.26
3.1 Warnings................................................................ p.26
3.2 Fuel gas supply.................................................... p.26
3.3 Combustion products exhaust...................... p.27
3.4 Flue gas condensate drain.............................. p.32
3.5 Air ducting ............................................................ p.33
4 Electrical installer......................................................... p.33
4.1 Warnings................................................................ p.33
4.2 Electrical systems ............................................... p.34
4.3 Electrical power supply.................................... p.34
4.4 Control system..................................................... p.34
4.5 Temperature probes inputs............................ p.42
4.6 0-10 V input .......................................................... p.44
5 First start-up....................................................................... p.44
5.1 Preliminary checks............................................. p.44
5.2 Combustion parameters check..................... p.44
5.3 Gas changeover .................................................. p.48
5.4 Setting the parameters .................................... p.48
6 Normal operation......................................................... p.50
6.1 Warnings................................................................ p.50
6.2 Switch on and o................................................ p.50
6.3 Messages on the display.................................. p.52
6.4 GEN10 board menus and parameters......... p.52
6.5 Modifying settings............................................. p.53
6.6 Restarting a locked-out unit........................... p.53
6.7 Eciency ............................................................... p.54
7 Maintenance....................................................................... p.54
7.1 Warnings................................................................ p.54
7.2 Scheduled routine maintenance.................. p.54
7.3 Resetting the temperature limit
thermostat............................................................ p.54
7.4 Emergency mode............................................... p.55
7.5 Periods of inactivity........................................... p.55
8 Diagnostics........................................................................... p.55
8.1 Board codes.......................................................... p.55
9 Appendices........................................................................... p.57
9.1 Product che........................................................ p.57
TABLE OF CONTENTS

Introduction
4
I
I INTRODUCTION
Installation, use and maintenance manual
This Manual is an integral part of the Next-G appli-
ance 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 Next-G appliance requires a control
device to be connected by the installer.
I.3 AVAILABLE LANGUAGES
This Installation, use and maintenance manual is originally
writteninItalianandEnglish.Anyotherlanguagesaretrans-
lations of this Installation, use and maintenance manual.
For versions of this
Installation, use and maintenance manual in other lan-
guages, 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
Appliance / Unit = equivalent terms, both used to refer to
the gas unit heater.
TAC = Technical Assistance Centre authorised by Robur.
OCDS012 1-key basic control = control device that sig-
nals warnings or errors in the appliance and allows its
resetting.
OCDS016 2-key basic control = control device that sig-
nals warnings or errors in the appliance and allows its re-
setting and also allows selecting winter operation (space
heating), summer operation (ventilation) or switch o.
Remote control OCDS015 = Robur control device that
integrates the functions of room temperature control, re-
mote control and report of any anomalies of one or more
Next-G gas unit heaters, also divided over several zones.
External request = generic control device (e.g. thermo-
stat, timer or any other system) equipped with a volt-
age-free NO contact and used as control to start/stop the
unit.
OCDS008 digital chronothermostat = device that in-
tegrates the functions of room temperature control and
remote control of one or more Next-G gas unit heaters,
when connected to the OTRG005 thermoregulator.
First start-up = appliance commissioning operation
which may only and exclusively be carried out by a TAC.
OSWR000 Genius software for remote management =
software that allows, through the OTRG005 termoregula-
tors, to centralize the management of up to 100 Next-G
gas unit heaters.
OSWR001 Genius software for remote management
= software that allowsto centralize the management, in-
cluding power modulation operation, of up to 100 Next-G
gas unit heaters.
OTRG005 thermoregulator = control device that allows
to manage settings and operation of one Next-G gas unit
heater.
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 spe-
cic knowledge on heating, 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 regulations in force and the manu-
facturer's instructions/provisions.
Misuse

Warnings
Installation, use and maintenance manual – Next-G 5
III
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.
Use of the appliance by children
The appliance can be used by children over 8 years
old, and by people with reduced physical, senso-
ry 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 understanding the
dangers inherent in it. Children should not play
with the appliance.
Hazardous situations
Do not start the appliance in hazardous conditions,
such as: gas smell, problems with the electrical/gas
system, parts of the appliance under water or dam-
aged, malfunctioning, disabling or bypassing con-
trol and safety devices.
In case of danger, request intervention by qualied
personnel.
In case of danger, switch o the electrical power
and gas supplies only if this can be done in total
safety.
Gas component tightness
Before performing any operation on gas ducting
components, close the gas valve.
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,
multimeters or other equipment that may cause
sparks next to the appliance.
Shut o the gas supply by turning the valve o.
Open immediately doors and windows to create a
cross-current of air to ventilate the room.
Switch o the power supply via the external dis-
connect switch in the power supply electrical pan-
el.
Use a telephone away from the appliance to ask for
intervention from qualied personnel.
Poisoning
Ensure the ue gas ducts are tight and compliant
with the regulations in force.
Upon completing any procedure, ensure the tight-
ness of the components.
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 inter-
nal components before the appliance has cooled
down.
Do not touch the ue gas exhaust before it has
cooled down.
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.
Earthing
Electrical safety depends on eective earthing sys-
tem, correctly connected to the appliance and in-
stalled according to the regulations in force.
Air ow
Do not obstruct the fan intake or the warm air
outlet.
Distance from combustible or ammable mate-
rials
Do not deposit ammable materials (paper, dilu-
ents, paints, etc.) near the appliance.
Comply with current regulations.
Aggressive substances in the air
The air of the installation site must be free from ag-
gressive substances.
Acid ue gas condensate
Discharge the acid condensate of combustion ue
gasincompliancewithcurrentexhaustregulations.
Switching the appliance o
Disconnecting the power supply while the appli-
ance 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 provided
control device.
In the event of failure
Operations on internal components and repairs

Warnings
6
III
may exclusively be carried out by a TAC, using only
original spare parts.
In the event of failure of the appliance and/or
breakage of any component, do not attempt to
repair and/or restore and immediately contact the
TAC.
Routine maintenance
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. 54 )
and in compliance with current regulations.
Appliance maintenance and repairs may only be
entrusted to rms legally authorised to work on
gas appliances and systems.
Enter into a maintenance contract with an author-
ised specialised rm for routine maintenance and
for servicing in case of need.
Use only original parts.
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 COMPLIANCE
III.2.1 EU directives and standards
The Next-G series gas unit heaters are certied in ac-
cordance with European regulation GAR 2016/426/EU
and meet the essential requirements of the following
Directives:
▶ 2016/426/EU "Gas Appliances Regulation" as amend-
ed and added.
▶ 2014/30/EC "Electromagnetic Compatibility Directive"
as amended and added.
▶ 2014/35/EC "Low Voltage Directive" as amended and
added.
▶ 2006/42/EC "Machine Directive" as amended and add-
ed.
▶ 2281/2016/EU "Ecodesign requirements for air heat-
ing products" as amended and added.
Furthermore, they comply with the requirements of the
following standards:
▶ EN 17082 Domestic and non-domestic gas-red forced
convection air heaters for space heating not exceed-
ing a net heat input of 300 kW.
III.2.2 Other applicable provisions and standards
The design, installation, operation and maintenance of
the systems shall be carried out in compliance with cur-
rent applicable regulations, depending on the Country
and location, and in accordance with the manufacturer's
instructions. In particular, regulations regarding the fol-
lowing shall be complied with:
▶ Gas systems and equipment.
▶ Electrical systems and equipment.
▶ Heating systems.
▶ Environmental protection and combustion products
exhaust.
▶ 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
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.
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.
Damages caused by external agents such as salts,
chlorine, sulphur or other chemical substances
present in the air of the installation site.
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.

Features and technical data
Installation, use and maintenance manual – Next-G 7
1
1 FEATURES ANDTECHNICAL DATA
1.1 FEATURES
1.1.1 Available range
Next-G gas unit heaters are available in three versions:
▶ with horizontal ow, with xed speed axial fan (Next-G
series)
▶ with horizontal ow, with axial fan with brushless vari-
able speed motor (Next-G EC series)
▶ with horizontal ow, ductables, with centrifugal fan
(Next-G C series)
1.1.2 Operation
The Next-G series gas unit heater is an independent heat-
ing appliance with airtight combustion circuit and forced
air draft.
It has been designed to be installed inside the room to be
heated.
The combustion circuit is room sealed and meets the re-
quirements for type C appliances: combustion air supply
and ue gas exhaust discharge take place outdoors and
are ensured by the functioning of a blower inserted in the
combustion circuit.
The appliance is also approved for type B for installations
where it is allowed to take the combustion air directly
from the room to be heated.
The operation of the gas unit heater is controlled by a con-
trol device (not supplied).
Any Next-G gas unit heater can work:
▶ on two heat output levels (100% - 30%)
▶ by modulating the heat input continuously from 100%
to 30%
▶ with xed air ow
▶ with modulating air ow, in accordance with the mod-
ulation of the heat input
The heat output and air ow management modes can be
combined as required.
The standard operation of the gas unit heater is in modu-
lation, thanks to the presence of the supplied room probe.
A blower upline of the burner mixes the air and gas and
expels the combustion fumes.
Products of gas combustion (natural gas or LPG) ow in-
ternally through the heat exchangers, which are invested
externally by the air current produced by the fan, deliver-
ing warm air ow into the room.
The fan starts automatically only when the heat exchang-
ers are hot, in order to prevent cold air from being intro-
duced into the room, and will turn o when the exchang-
ers are cold.
The air ow direction is adjustable vertically by means of
the revolving louvres of the grille.
If heat exchangers overheat due to malfunction, the tem-
perature probe cuts o the power supply to the gas valve
and drives the blower and the fan at maximum speed.
In the event of obstructions in the intake or exhaust duct,
or in the event of malfunction of the blower, the electron-
ic board will automatically modulate the gas unit heater
heat output.
In the event of obstructions or malfunction beyond the
permitted range, the gas valve stops and the gas unit
heater is switched o.
In summer it is possible to operate the fan only in order to
provide a pleasant air ow within the room.
1.1.3 Mechanical components
▶ Stainless steel multigas premix burner.
▶ High head blower, with rotation speed modulation.
▶ Cylindrical stainless steel combustion chamber.
▶ Robur patented heat exchangers, made out of a spe-
cial aluminium die-cast alloy, with horizontal nning
on the air side and vertical nning on the ue gas ex-
haust side, with a very high heat exchange capacity.
▶ Corrugated stainless steel heat recovery exchangers
with very large exchange surface.
▶ External steel panelling with epoxy powder enamel
nish.
▶ Axial fan(s) with high air ow, with rotation speed var-
iation (for Next-G EC series).
▶ Axial fan(s) with high air ow, with xed speed (for
Next-G series).
▶ Centrifugal fan (for the Next-G C series).
1.1.4 Control and safety devices
▶ GEN10 control board with microprocessor, display and
selection keys, providing the following functions:
burner ignition
ame monitoring and modulation
blower management and blower speed control
fan speed control
heat exchangers temperature probe control
minimum ue gas temperature probe control
room temperature control with the supplied probe
control of destratier function with optional probe
predictive start-up function control with optional
probe
congurable for management via Modbus com-
munication or 0-10 V signal
▶ Limit thermostat with manual reset against heat ex-
changers overheating.
▶ Gas solenoid valve.

Features and technical data
8
1
1.2 DIMENSIONS
1.2.1 Axial gas unit heaters
1.2.1.1 G 20
Figure1.1Unit dimensions
1 Ø 80mm ue gas exhaust
2 Combustion air inlet Ø 80 mm
3 Power supply cables input
4 Gas connection 3/4" M
5 Thermoformed door
6 Limit thermostat reset button
7 Flue gas exhaust blind cover, alternative to the rear one (1)
8 Condensate drain siphon (supplied as standard)
(*) Holes for xing to the support bracket
480
217
83
419
592
579 (EC)
138
342
82
219
444
485
678
120
403 386
230 255
410
77
1
2
8
5
7
176 (*) 400 (*)
247
4
3
6

Features and technical data
Installation, use and maintenance manual – Next-G 9
1
1.2.1.2 G 30
Figure1.2Unit dimensions
1 Ø 80mm ue gas exhaust
2 Combustion air inlet Ø 80 mm
3 Power supply cables input
4 Gas connection 3/4" M
5 Thermoformed door
6 Limit thermostat reset button
7 Flue gas exhaust blind cover, alternative to the rear one (1)
8 Condensate drain siphon (supplied as standard)
(*) Holes for xing to the support bracket
777
435
405 (*)
593
731
475
210
370 (*)
475
515
735
219
132
158
120
384
340
690
432
257257
76
5
12
3
4
7
689 (EC)
6
8

Features and technical data
10
1
1.2.1.3 G 35
Figure1.3Unit dimensions
1 Ø 80mm ue gas exhaust
2 Combustion air inlet Ø 80 mm
3 Power supply cables input
4 Gas connection 3/4" M
5 Thermoformed door
6 Limit thermostat reset button
7 Flue gas exhaust blind cover, alternative to the rear one (1)
8 Condensate drain siphon (supplied as standard)
(*) Holes for xing to the support bracket
158 132
219
405 (*)
593
731
689 (EC)
475
210
370 (*)
474
515
735
120
386
340
690
76
432
252 263
435
777
12
4
5
7
3
6
8

Features and technical data
Installation, use and maintenance manual – Next-G 11
1
1.2.1.4 G 45
Figure1.4Unit dimensions
1 Ø 80mm ue gas exhaust
2 Combustion air inlet Ø 80 mm
3 Power supply cables input
4 Gas connection 3/4" M
5 Thermoformed door
6 Limit thermostat reset button
7 Flue gas exhaust blind cover, alternative to the rear one (1)
8 Condensate drain siphon (supplied as standard)
(*) Holes for xing to the support bracket
435
777
158 132
405 (*)
593
738
483
475
210
370 (*)
475
735
120
340
690
12
4
5
7
219
432
257 257
76
515
3
6
8
743 (EC)

Features and technical data
12
1
1.2.1.5 G 60
Figure1.5Unit dimensions
1 Ø 80mm ue gas exhaust
2 Combustion air inlet Ø 80 mm
3 Power supply cables input
4 Gas connection 3/4" M
5 Thermoformed door
6 Limit thermostat reset button
7 Flue gas exhaust blind cover, alternative to the rear one (1)
8 Condensate drain siphon (supplied as standard)
(*) Holes for xing to the support bracket
435
777
158 110
219
405 (*)
593
743
475
210
620 (*)
668
709
929
5
511
340
690
120 12
4
7
76
626
355354
3
6
8

Features and technical data
Installation, use and maintenance manual – Next-G 13
1
1.2.1.6 G 75
Figure1.6Unit dimensions
1 Ø 80mm ue gas exhaust
2 Combustion air inlet Ø 80 mm
3 Power supply cables input
4 Gas connection 3/4" F
5 Thermoformed door
6 Limit thermostat reset button
7 Flue gas exhaust blind cover, alternative to the rear one (1)
8 Condensate drain siphon (supplied as standard)
(*) Holes for xing to the support bracket
435
777
158
405 (*)
689
593
110
219
810 (*)
859
900
1120
475
210
234 432 234
817
76
340
690
386
120
5
12
4
7
3
6
8

Features and technical data
14
1
1.2.1.7 G 90
Figure1.7Unit dimensions
1 Ø 80mm ue gas exhaust
2 Combustion air inlet Ø 80 mm
3 Power supply cables input
4 Gas connection 3/4" F
5 Thermoformed door
6 Limit thermostat reset button
7 Flue gas exhaust blind cover, alternative to the rear one (1)
8 Condensate drain siphon (supplied as standard)
(*) Holes for xing to the support bracket
435
777
158 110
219
405 (*)
593
725
475
210
1010 (*)
1059
1100
1320
280 540 280
1017
76
528
120
340
690
12
4
5
7
3
6
8
743 (EC)

Features and technical data
Installation, use and maintenance manual – Next-G 15
1
1.2.2 Centrifugal gas unit heaters
1.2.2.1 G 30 C
Figure1.8Unit dimensions
1 Ø 80mm ue gas exhaust
2 Combustion air inlet Ø 80 mm
3 Power supply cables input
4 Gas connection 3/4" M
5 Thermoformed door
6 Limit thermostat reset button
7 Flue gas exhaust blind cover, alternative to the rear one (1)
8 Condensate drain siphon (supplied as standard)
(*) Holes for xing to the support bracket
446
134
197
158 132
219
405 (*)
460
601
1072
260
260
469580
40
157
777
370 (*)
475
528
595
735
40
775
432
76
601
472
446
278
333
550
340
690
120
5
3
6
4
12
8
7

Features and technical data
16
1
1.2.2.2 G 60 C
Figure1.9Unit dimensions
1 Ø 80mm ue gas exhaust
2 Combustion air inlet Ø 80 mm
3 Power supply cables input
4 Gas connection 3/4" M
5 Thermoformed door
6 Limit thermostat reset button
7 Flue gas exhaust blind cover, alternative to the rear one (1)
8 Condensate drain siphon (supplied as standard)
(*) Holes for xing to the support bracket
521
85
172
405 (*)
158 110
219
460
601
1138
260
260
469
580
157
40
777
620 (*)
676
722
789
92940
601
537
525
626
969
327 522
340
690
311
565
120
5
12
3
6
4
8
7

Features and technical data
Installation, use and maintenance manual – Next-G 17
1
1.3 COMPONENTS
Figure1.10Internal components
1 Electrical panel
2 GEN10 electronic board
3 Controller for ignition, adjustment and
ame control
4 GEN10 board display
5 Terminal block
6 Limit thermostat reset button
7 Ignition transformer
8 Gas valve
9 Fan terminal block
10 Flame sensor / ignition electrodes
11 Combustion blower
1
3
2
4
5
6
8
9
11
10
7

Features and technical data
18
1
1.4 ELECTRONIC BOARD
The appliance's electrical panel contains the GEN10 mi-
croprocessor electronic board, which controls the appli-
ance and displays data, messages and operating codes.
The appliance is monitored and programmed by in-
teracting with the display and selection keys (Figure
1.14 p.18 ).
Figure1.14GEN10 board display
1.5 OPERATION MODE
The Next-G gas unit heater has the possibility of operating
in two modes, which can be selected via parameter P42
(Paragraph 5.4 p.48 ):
▶ with a Modbus controller
▶ with contact inputs
There are two service requests for both modes:
▶ ventilation
▶ heating
The features available with each operating mode are de-
tailed below.
The Next-G gas unit heater, thanks to the presence of the
supplied room probe, modulates the heat output contin-
uously, following the setpoint set in parameter P53 (Para-
graph 5.4 p.48 ).
If you do not wish to use the supplied room probe, it will
be possible to manage the gas unit heater operation on
two heat output levels by opening or closing the "VENT."
contact (the "HEAT." contact must be closed by a suit-
able device to activate the heating request, Paragraph
1.5.3 p.19 ).
1.5.1 With a Modbus controller
With a Modbus controller, to activate the heating or
ventilation service it is necessary that the service is re-
quested via Modbus and in addition the corresponding
contact service request input must is closed (Paragraph
1.5.3 p.19 ).
If not managed, the contact service request inputs
must be jumpered accordingly.
Loss of communication with the Modbus con-
troller results in deactivation of the service re-
quest and shutdown of the appliance.
1.5.1.1 With the OCDS015 remote control
The supported service request types are:
▶ standby
▶ ventilation
▶ xed power heating (3 power levels), with the remote
control providing the setpoint and current room tem-
perature
▶ xed power heating (3 power levels), with the remote
control providing the setpoint and room temperature
measured by the appliance using the supplied room
probe
▶ modulating heating, with the remote control provid-
ing the setpoint and current room temperature
▶ modulating heating, with the remote control provid-
ing the setpoint and room temperature measured by
the appliance using the supplied room probe
▶ modulating heating, with the remote control provid-
ing the required power level as a percentage of maxi-
mum power
1.5.1.2 With the Genius software OSWR001
The supported service request types are:
▶ standby
▶ ventilation
▶ on/o heating, with the Genius software OSWR001
providing the setpoint and current room temperature
▶ xed power heating (2 power levels), with the Genius
software OSWR001 providing the setpoint and current
room temperature
▶ modulating heating, with the Genius software OS-
WR001 providing the setpoint and room temperature
measured by the appliance using the supplied room
probe
1.5.1.3 With a generic Modbus controller
For activation of the heating or ventilation service in the
presence of a generic Modbus controller please refer to
the document with the Modbus mapping for the specic
FW version of the GEN10 board, available on request from
the Robur technical service.
The types of service requests supported will depend on
the Modbus registers managed by the specic Modbus
controller used.
1.5.2 With contact inputs
Without a Modbus controller, the service request is made
exclusively via the appropriate contact request inputs
(Paragraph 1.5.3 p.19 ).
The supported service request types are:
▶ standby
▶ ventilation
▶ xed power heating
▶ xed power heating, with xed setpoint (settable, Par-
agraph 5.4 p. 48 ) and room temperature measured
by the appliance via the supplied room probe
▶ modulating heating, with xed setpoint (settable, Par-
agraph 5.4 p. 48 ) and room temperature measured

Features and technical data
Installation, use and maintenance manual – Next-G 19
1
by the appliance via the supplied room probe
▶ xed power heating, with setpoint from 0-10 V input
and room temperature measured by the appliance via
the supplied room probe
▶ modulating heating, with setpoint from 0-10 V input
and room temperature measured by the appliance via
the supplied room probe
▶ modulating heating, with the 0-10 V input providing
the required power level as a percentage of maximum
power
1.5.3 Contact service request inputs
Depending on the active inputs and whether or not the
supplied room temperature probe is enabled (default)
or not, the functions described in the following Tables
1.1 p.19 and 1.2 p.19 are obtained.
Table1.1Functions available depending on the status of the
contact inputs with room temperature probe enabled
“VENT.”input “HEAT.”input Features
open open o
closed open ventilation
open or closed closed modulating heating
Table1.2Functions available depending on the status of the
contact inputs with room temperature probe disabled
“VENT.”input “HEAT.”input Features
open open o
closed open ventilation
open closed heating at minimum power level
closed closed heating at maximum power level
More in detail, thanks to the presence of the supplied
room probe, enabled by default, when the "HEAT." contact
is closed, the gas unit heater will operate in heating mode
in modulation, regardless of the status of the "VENT."
contact.
To achieve operation on two heat output levels it is nec-
essary to disable the room temperature probe, set param-
eter P45 to value 0 (Paragraph 5.4 p. 48 ), consequent-
ly renouncing to the modulation of heat output, and at
that point, it will be possible to manage the two heat
output levels either through the contact request inputs,
as described above, or through one of the controls that
allow automated management of the heat output levels
(OTRG005 thermoregulator with or without OCDS008 dig-
ital chronothermostat and OSWR000 or OSWR001 Genius
software for remote management).
1.5.4 Automatic destratication function
In the operating modes in which the heating service is
based on the room temperature (measured directly by the
room probe connected to the gas unit heater) it is possi-
ble to activate the automatic destratication by installing
the destratication temperature probe, conguring pa-
rameter P46 to value 1 (Paragraph 5.4 p.48 ) and setting
the parameters relative to the minimum temperature dif-
ference above which the stratied heat can be used (P80,
Paragraph 5.4 p. 48 ) and the maximum destratication
time (P81, Paragraph 5.4 p.48 ).
The destratication operation is activated when a room
temperature below the setpoint is detected and the gas
unit heater detects, via the destratication probe, that
there is sucient stratied heat to be used instead of
starting the gas unit heater for heating.
In destratication mode, the gas unit heater will only turn
on the fans, keeping the burner o, until there is sucient
stratied heat to be used or the maximum destratication
time has elapsed, after which if the room temperature is
still insucient the destratication function will be inter-
rupted and the burner started for normal heating.
In the absence of the OCDS015 Modbus remote control
or of a generic Modbus controller that manages the deac-
tivation of the destratication function, to deactivate the
function it is necessary to set parameter P46 to the value
0.
1.6 CONTROLS
1.6.1 Control device
The appliance may only work if it is connected to a control
device, selected from:
1. OCDS015 Modbus remote control
2. Generic Modbus controller
3. OCDS012 1-key basic control
4. OCDS016 2-key basic control
5. OTRG005 thermoregulator
6. OCDS008 digital chronothermostat (only in associa-
tion with OTRG005 thermoregulator)
7. OSWR000 Genius software for remote management
of gas unit heaters (only in association with OTRG005
thermoregulator)
8. OSWR001 Genius software for remote management of
gas unit heaters
9. External request
1.6.2 OCDS015 Modbus remote control
The OCDS015 remote control is an optional control device
with a colour touch screen that allows centralised man-
agement of the Next-G gas unit heaters, up to a maximum
of 30 gas unit heaters even divided over a maximum of 6
zones.
The main functions are:
▶ Programmed on/o switching of the gas unit heaters,
up to a maximum of 30.
▶ Possibility of dividing the connected gas unit heaters
into several zones, up to a maximum of 6, each with
its own setpoint, operating mode and time program-
ming.
▶ Management of the automatic destratication func-
tion.
▶ Space heating and summer ventilation setpoint set-
ting.
▶ Antifreeze function.
▶ Summer ventilation mode activation.
▶ Centralised control with touch interface.
▶ Diagnostics.
▶ Possibility to interface with a BMS system.
▶ Possibility of temporarily excluding one or more appli-
ances from operation.

Features and technical data
20
1
1.6.3 Generic Modbus controller
The Next-G gas unit heaters can interact directly with a
generic Modbus controller on which the registers re-
quired to control the gas unit heater itself have been ap-
propriately congured.
Depending on the registers managed on the Modbus
controller, the relevant functions will be available or not
(switching the gas unit heater on/o, choosing the oper-
ating mode, error reporting and reset, setpoint setting, ...).
The document describing the mapping and
meaning of the Modbus registers implemented
on the GEN10 board is available on-demand from
Robur technical service.
1.6.4 OCDS012 1-key basic control
Figure1.15OCDS012 1-key basic control
Its functions are:
▶ Light signalling of the presence of errors or warnings
of the gas unit heater.
▶ Reset of the lockout (for lockouts that can be reset).
The OCDS012 1-key basic control does not allow to con-
trol the switching on and o of the appliance for space
heating, nor for the summer ventilation.
Heat output modulation is managed independently by
the gas unit heater thanks to the presence of the supplied
room probe.
For further details and diagrams see Paragraph
4.4.3 p.35 .
An external request (Paragraph 1.6.10 p. 21 ) must be
used to control the operation of the gas unit heater.
1.6.5 OCDS016 2-key basic control
Figure1.16OCDS016 2-key basic control
Its functions are:
▶ Light signalling of the presence of errors or warnings
of the gas unit heater.
▶ Reset of the lockout (for lockouts that can be reset).
▶ Selection of the operating mode: heating, summer
ventilation or o.
Heat output modulation is managed independently by
the gas unit heater thanks to the presence of the supplied
room probe.
For further details and diagrams see Paragraph
4.4.4 p.35 .
1.6.6 OTRG005 thermoregulator
Figure1.17OTRG005 thermoregulator
The thermoregulator is a device that can directly manage
wall-mounted gas unit heaters: the serial interface makes
it possible to create cascade systems managed by a sin-
gle chronothermostat (optional OCDS008, described in
Paragraph 1.6.7 p.20 ), with considerable advantages in
terms of thermoregulation, especially in large spaces.
The main functions are:
▶ Turning the gas unit heater on/o.
▶ Ambient temperature measurement by NTC probe.
▶ Automatic management of power modulation.
▶ Diagnostics.
▶ Reset of the ame lockout.
▶ Gas unit heater data display and parameters setting.
▶ Space heating and summer ventilation setpoint set-
ting.
▶ Summer ventilation mode activation.
▶ Possibility of creating cascaded systems.
▶ Possibility of remote management via Modbus.
For further details and diagrams see OTRG005 thermoreg-
ulator instruction sheet and Paragraph 4.4.5 p.36 .
1.6.7 OCDS008 digital chronothermostat
Figure1.18OCDS008 digital chronothermostat
OCDS008 digital chronothermostat integrates the func-
tions of room temperature control and remote control of
the gas unit heaters heating system in a single interface,
specically designed to make all functions available to the