ROBUA G Series User manual

2021
ready
ErP
G
Condensing gas unit heaters for use in industrial and
commercial installations
Installation, use and maintenance manual
Powered by natural gas/LPG

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.
Revision: N
Code: D-LBR565
DISPOSAL
The appliance and all its accessories must be disposed of separately in accordance with the regulations in force.
Use of theWEEE symbol (Waste Electrical and Electronic Equipment) indicates that this product cannot be disposed of as house-
hold waste. Proper disposal of this product helps to prevent potential negative consequences for the environment and human
health.

Installation, use and maintenance manual – G gas unit heater 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.8
1.3 Electrical wiring diagram................................. p.11
1.4 Controls.................................................................. p.12
1.5 Technical data...................................................... p.13
2 Transport and positioning.................................. p.14
2.1 Warnings................................................................ p.14
2.2 Handling................................................................ p.14
2.3 Appliance positioning ...................................... p.14
2.4 Minimum clearance distances....................... p.15
2.5 Support bracket.................................................. p.15
3 Heating engineer........................................................... p.17
3.1 Warnings................................................................ p.17
3.2 Fuel gas supply.................................................... p.17
3.3 Combustion products exhaust...................... p.18
3.4 Flue gas condensate discharge..................... p.22
4 Electrical installer......................................................... p.23
4.1 Warnings................................................................ p.23
4.2 Electrical systems ............................................... p.23
4.3 Electrical power supply.................................... p.23
4.4 Control system..................................................... p.24
4.5 Remote the fault signals.................................. p.25
4.6 Remote the error reset ..................................... p.26
5 First start-up....................................................................... p.26
5.1 Preliminary checks............................................. p.26
5.2 Combustion parameters check..................... p.27
5.3 Gas changeover .................................................. p.28
6 Normal operation......................................................... p.28
6.1 Warnings................................................................ p.28
6.2 Switch on and o................................................ p.28
6.3 Chronothermostat............................................. p.29
6.4 Gas unit heater operating modes................. p.36
6.5 Operating diagrams .......................................... p.39
6.6 Setting range ....................................................... p.41
7 Maintenance....................................................................... p.41
7.1 Warnings................................................................ p.41
7.2 Scheduled routine maintenance.................. p.42
7.3 Resetting the temperature limit
thermostat............................................................ p.42
7.4 Troubleshooting ................................................. p.42
7.5 Periods of inactivity........................................... p.42
8 Appendices........................................................................... p.44
8.1 Product che........................................................ p.44
INDEX OF CONTENTS

Introduction
4
I
I INTRODUCTION
Installation, use and maintenance manual
This Manual is an integral part of the G 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
To be able to operate, the G unit must be connected to the
supplied chronothermostat (see Paragraph 1.4 p.12 ).
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.
Chronothermostat = control device that integrates the
functions of room temperature control, programmable
timer and indication of any operating errors.
First start-up = appliance commissioning operation
which may only and exclusively be carried out by a TAC.
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
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 device 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.
Do not entrust children, persons with physical,
sensory or mental disabilities or persons with poor
knowledge and experience with use of the appli-
ance.
Gas component tightness

Warnings
Installation, use and maintenance manual – G gas unit heater 5
III
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 purify 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 tightness and compli-
ant 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
gas, as indicated in Paragraph 3.4 p. 22 , in com-
pliance with current exhaust regulations.
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
may exclusively be carried out by a TAC, using only
original 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. 41 )
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.

Warnings
6
III
III.2 CONFORMITY
EU directives and standards
The G series gas unit heaters are certied in accordance
with European regulation GAR 426/2016/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 1020 Non-domestic forced convection gas-red air
heaters for space heating not exceeding a net heat in-
put of 300 kW incorporating a fan to assist transporta-
tion of combustion air or combustion products.
▶ prEN 17082 Domestic and non-domestic gas-red
forced convection air heaters for space heating not ex-
ceeding a net heat input of 300 kW.
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 – G gas unit heater 7
1
1 FEATURES AND TECHNICAL DATA
1.1 FEATURES
1.1.1 Operation
The G series gas unit heater is an independent heating
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 gas unit heater operation is controlled by a room
thermostat, integrated in the supplied chronothermostat.
The gas unit heater operates by modulating the heat out-
put and ventilation speed continuously.
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 operates automatically only when it receives the
enabling signal from the fan thermostat, i.e. with hot heat
exchangers, in order to avoid the introduction of cold air
into the room, and it will switch o with cold exchangers.
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. If
the temperature should increase further, the limit ther-
mostat trip causes the gas unit heater to switch o.
A blower upline of the burner mixes the air and gas and
expels the combustion fumes.
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 ue thermostat trip
causes the gas valve to stop and the gas unit heater to be
turned o.
The winter operation of the gas unit heater can be auto-
matic or manual.
In summer it is possible to operate the fan only in order to
provide a pleasant air ow within the room.
1.1.2 Mechanical components
▶ Premix stainless steel 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.
▶ External steel panelling with epoxy powder enamel
nish.
▶ Axial fan(s) with high air ow, with rotation speed var-
iation.
1.1.3 Control and safety devices
▶ Electronic management board, with microprocessor
and noise lter, which provides the following func-
tions:
burner ignition
ame monitoring and modulation
blower management and blower speed control
fan speed control
heat exchanger temperature probe control
minimum ue gas temperature probe control
▶ 100 °C limit thermostat with manual reset against heat
exchangers overheating.
▶ Flue thermostat.
▶ Gas solenoid valve.

Features and technical data
8
1
1.2 DIMENSIONS
Figure1.1G30, G45, G60 gas unit heater dimensions
1 Flue gas exhaust
2 Combustion air inlet
3 Power supply cables input
4 Gas connection 3/4" F
5 Condensate drain siphon (supplied as standard)
C
Q
I
F
D
B
W
1
T
R
2
3
X Y
4
5
Z
H
L
N
J
E
G
A
M

Features and technical data
Installation, use and maintenance manual – G gas unit heater 9
1
Figure1.2G100 gas unit heater dimensions
1 Flue gas exhaust
2 Combustion air inlet
3 Power supply cables input
4 Gas connection 3/4" F
5 Condensate drain siphon (supplied as standard)
H
L
N
J
E
G
A
M
C
Q
I
F
D
B
1
2
3
4
5
T
R
W
540
X Y
Z

Features and technical data
10
1
Table1.1Dimensions
G30 G45 G60 G100
A656 706 796 1296
B710 715 720 740
C800 800 800 800
D570 570 570 570
E370 370 510 1010
F405 405 405 405
G440 490 580 1080
H536 536 536 536
I157,2 157,2 157,2 157,2
J307 327 371 507
L180 180 180 180
M20 20 20 20
N223 223 223 223
Q360 360 360 360
R340 340 340 340
T720 720 720 720
W380 480 500 520
X80 80 80 80
Y80 80 80 80
Z120 120 120 120

Features and technical data
Installation, use and maintenance manual – G gas unit heater 11
1
1.3 ELECTRICAL WIRING DIAGRAM
Figure1.3Electrical wiring diagram for G30, G45, G60
SF Blower
SCH1 Control board
SCH2 Motor board
S Heat exchanger temperature probe
RLZ Flame sensor
EV Gas solenoid valve
TR Ignition transformer
V1 Fan
STF Flue gas temperature probe
TL Limit thermostat
AC Ignition electrodes
TRF1Fan autotransformer
P1 Earthing
CR Chronothermostat
1 Brown
2 Red
3 Blue
4 Pink
5 Grey
6 Yellow
7 Green
8 White
9 Black
10 Purple
1 2 3 4 5 6
N
X12
CR
N
SF
~
L
1
5
X15
X3
X17
X16
X22
X18
N
TR
P3
N
X19
FUSE 2A
T3
T3
T2
T1
L1
N1
X7 P1
T5
X7
EV
RLZ
AC
FUSE 6.3A
X13
LN
GND
X5
X6
X3
X1
K4 K3 K2
X7 X10
X9
X11
X8 C
1
2
3
4
F1
K1 COM
MIN
MED/MIN
MED/MAX
MAX
L
N
X9
SCH1
SCH2
IN 230V 50Hz
GND
V1
~
MM-1
230
0
TRF 1
N
TL
S
STF
3 9 5210
8
1
FN1
FL1
FN2
FL2
LD1

Features and technical data
12
1
Figure1.4Electrical wiring diagram for G100
SF Blower
SCH1 Control board
SCH2 Motor board
S Heat exchanger temperature probe
RLZ Flame sensor
EV Gas solenoid valve
TR Ignition transformer
V1-V2 Fan
STF Flue gas temperature probe
TL Limit thermostat
AC Ignition electrodes
P1 Earthing
CR Chronothermostat
1 Brown
2 Red
3 Blue
4 Pink
5 Grey
6 Yellow
7 Green
8 White
9 Black
10 Purple
1 2 3 4 5 6
N
X12
CR
N
SF
L
1
5
~
X15
X3
X17
X16
X22
X18
N
TR
P3
N
X19
FUSE 2A
T3
T3
T2
T1
L1
N1
X7
P1
T5
X7
EV
RLZ
AC
COM
MIN
MED/MIN
MED/MAX
MAX
FUSE 6.3A
X13
LN
GND
X5
X6
X3
X1
L
N
K4 K3 K2
X7 X10
X9
X11
X8 C
1
2
3
4
F1
K1
X9
SCH1
SCH2
IN 230V 50Hz
GND V1
V2
~~
TL
S
STF
LD1
1.4 CONTROLS
1.4.1 Control device
The unit operation is controlled by the supplied digital
chronothermostat.
For further information please refer to Paragraph
6.3 p.29 .

Features and technical data
Installation, use and maintenance manual – G gas unit heater 13
1
1.5 TECHNICAL DATA
Table1.2Technical data
G30 G45 G60 G100
Heating mode
Heat input nominal (1013 mbar - 15 °C) (1) kW 30,0 45,0 58,0 93,0
minimum (1) kW 15,0 19,3 31,7
Heat output nominal kW 29,2 43,3 56,2 90,2
minimum kW 15,8 15,6 20,2 33,5
Eciency
nominal heat input % 97,3 96,5 97,0
minimal heat input % 105,3 104,3 104,6 105,7
useful at 100% heat input % 96,8 96,0 96,5
Heat losses
to ue in operation % 2,70 3,50 3,00
to casing in operation % 0,50
with burner o % 0,10
Temperature rise nominal air ow rate K 29,0 32,0 31,0
minimal air ow rate K 22,0 15,0 14,0 18,0
lenght of throw (residual speed < 0,5 m/s) (2) m 18,0 25,0 31,0 40,0
Ambient air temperature
(dry bulb)
maximum °C 35 (3)
minimum °C 0
Electrical specications
Power supply
voltage V 230
type - single-phase
frequency Hz 50
Electrical power absorption nominal kW 0,21 0,33 0,58 1,00
fuse A 6,3
Degree of protection fan motor IP 54 33
appliance IP 20
Installation data
Gas consumption
G20 natural gas (nominal) m³/h 3,17 4,76 6,14 9,84
G25 (nominal) m³/h 3,69 5,54 7,14 11,45
G25.1 (nominal) m³/h 3,69 5,53 7,13 11,43
G25.3 (nominal) m³/h 3,16 5,42 6,98 11,19
G27 (nominal) m³/h 3,87 5,81 7,49 -
G2.350 (nominal) m³/h 4,41 6,62 8,53 -
G30 (nominal) kg/h 2,37 3,55 4,57 7,33
G31 (nominal) kg/h 2,33 3,55 4,51 7,22
Air ow nominal m³/h 2840 3850 5050 8250
minimum m³/h 2050 2900 4000 5200
Gas connection type - F
thread “ 3/4
Flue gas exhaust
diameter (Ø) mm 80
residual head Pa 65 100 120 200
type of installation - B23, C13, C33, C53, C63
Combustion air intake
connection diameter (Ø) mm 80
maximum ow ue condensate l/h 4,6 6,9 8,9 14,4
recommended height m 3,0 ÷ 3,5
sound power Lw(max) dB(A) 79,0 85,5 89,5
sound power Lw(min) dB(A) 73,5 79,5 83,5
sound pressure Lpat 5 metres (max) dB(A) 57,0 63,5 67,5
sound pressure Lpat 5 metres (min) dB(A) 51,5 57,5 61,5
Dimensions
depth mm 710 715 720 740
height mm 800
width mm 656 706 796 1296
Weight in operation kg 55 65 75 120
General information
number of heat exchangers - 2 3 4 8
type of heat exchangers -tower
number of fans - 1 2
(1) Relative to NCV (net caloric value).
(2) Values measured in an open area; in a real installation, the thermal ow may reach greater distances than those given here (depending on the height of the ceiling
and its thermal insulation).
(3) The operating temperature of the appliance components is 0 °C / +60 °C.

Transport and positioning
14
2
2 TRANSPORT AND POSITIONING
2.1 WARNINGS
Damage from transport or installation
The manufacturer shall not be liable for any dam-
age during appliance transport and installation.
On-site inspection
Upon arrival at the site, ensure there is no transport
damage on packing, metal panels or chronother-
mostat.
After removing the packing materials, ensure the
appliance is intact and complete.
Packing
Only remove the packing after placing the appli-
ance 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.
Lift up the unit and secure it to its support bracket
(Paragraph 2.5 p.15 ).
2.2 HANDLING
2.2.1 Handling and lifting
▶ Always handle the appliance in its packing, as deliv-
ered by the factory.
▶ Comply with safety regulations at the installation site.
2.3 APPLIANCE POSITIONING
The unit must be installed in the room to be heated.
2.3.1 Where to install the appliance
The wall or structure on which the unit is to be in-
stalled must be load-bearing or, in any case, suit-
able for supporting its weight.
Installation must not be made on walls with poor
strength that do not guarantee adequate resist-
ance to the stresses produced by the unit. The
manufacturer does not assume any responsibility
if the appliance is installed on surfaces or walls that
are not suitable for supporting its weight.
The appliance's ue gas exhaust must not be im-
mediately close to openings or air intakes of build-
ings, and must comply with safety and environ-
mental regulations.
To obtain the maximum system eciency it is advisable to
comply with the following rules:
▶ Make sure that the air ow does not directly impinge
on the sta (by tilting the grille louvres appropriately).
▶ Take any obstacles into account (pillars or other).
▶ Consider length of throw of the unit (Table 1.2 p.13 ).
▶ For better heat distribution in the case of multiple unit
installations, create alternate ows of warm air (see
Figure 2.1 p.14 ).
▶ In some cases it may also be suitable to place the units
close to the main doors, so that they can also operate
as air barriers when doors are opened.
Figure2.1Airow distribution

Transport and positioning
Installation, use and maintenance manual – G gas unit heater 15
2
2.4 MINIMUM CLEARANCE DISTANCES
2.4.1 Distances from combustible or ammable
materials
▶ Keep the appliance away from combustible or am-
mable materials or components, in compliance with
applicable regulations.
2.4.2 Clearances around the appliance
The minimum clearance distances are required for
safety, operation and maintenance.
Figure2.2Clearances
A Gas unit heater width B Object or structure underneath the gas unit heater
B
>350 mm
>400 mm
< 3,5 m
> 2,5 m
>200 mm A A
>500 mm
The recommended height from the oor to the
gas unit heater base is 2,5 to 3,5 m (see Figure
2.2 p. 15 ). We do not recommend installing the
gas unit heaters at heights below 2,5 m from the
oor.
2.5 SUPPORT BRACKET
Robur provides easy mounting support brackets as an
optional, suitably designed for G series gas unit heaters,
which allow simplifying the wall xing.
The following support brackets are available:
▶ O19800020 revolving wall support bracket (G30, G45
models)
▶ O19800024 revolving wall support bracket (G60 mod-
el)
▶ O19800028 revolving wall support bracket (G100
model)
▶ OSTF009 support bracket 1,4 m length
All support brackets are supplied with bolts and the rear
support plate.
For mounting instructions of the brackets, refer to the rel-
evant instruction sheets.
If you do not want to use these options, refer to Figure
2.3 p.15 .
When xing the unit to the support brackets, use 4 M10
bolts.
Figure2.3Installation with support bracket
A Gas unit heater xing points centre distance
B Support bracket length
40405
B
A

Transport and positioning
16
2
Table2.1Support bracket dimensions
G30 G45 G60 G100
A370 370 510 1010
B840

Heating engineer
Installation, use and maintenance manual – G gas unit heater 17
3
3 HEATING ENGINEER
3.1 WARNINGS
3.1.1 General warnings
Read the warnings in Chapter III.1 p. 4 , pro-
viding important information on regulations and
on safety.
Compliance with installation standards
Installation must comply with applicable regula-
tions in force, based on the installation Country
and site, in matters of safety, design, implementa-
tion and maintenance of:
heating systems
gas systems
ue gas exhaust
ue gas condensate discharge
Installation must also comply with the manufactur-
er's provisions.
3.2 FUEL GAS SUPPLY
3.2.1 Gas connection
▶ 3/4" F
on the rear, to the left (see dimensional diagrams,
Paragraph 1.2 p.8 ).
▶ Install an anti-vibration connection between the ap-
pliance and the gas piping.
3.2.2 Mandatory shut-o valve
▶ Provide a gas shut-o valve (manual) on the gas supply
line, next to the appliance, to isolate it when required.
▶ Provide a three-piece pipe union.
▶ Perform connection in compliance with applicable
regulations.
3.2.3 Gas pipes sizing
The gas pipes must not cause excessive pressure drops
and, consequently, insucient gas pressure for the
appliance.
3.2.4 Supply gas pressure
This appliance is equipped for a maximum gas
supply pressure of 50 mbar.
The appliance's gas supply pressure, both static and dy-
namic, must comply with Table 3.1 p.17 , with tolerance
± 15%.
Non compliant gas pressure (Table 3.1 p. 17 )
may damage the appliance and be hazardous.
Table3.1Network gas pressure
Gas supply pressure [mbar]
Product
category Countries of destination G20 G25 G25.1 G25.3 G2.350 G27 G30 G31
II2H3B/P
AL, BG, CH, CY, CZ, DK, EE, FI, GR, HR, IT, LT, LV, MK, NO,
RO, SE, SI, SK, TR 20 30 30
AT, CH 20 50 50
II2H3P
AL, BG, CH, CZ, ES, GB, GR, HR, IE, IT, LT, LV, MK, PT, SI,
SK, TR 20 37
RO 20 30
AT 20 50
II2ELL3B/P DE 20 20 50 50
II2Esi3P FR 20 25 37
II2Er3P 20 25 37
II2H3B/P HU 25 30 30
II2HS3B/P 25 25 30 30
II2E3P LU 20 50
II2L3B/P
NL
25 30 30
II2L3P 25 37
II2EK3B/P 20 25 30 30
II2EK3P 20 25 30
II2E3B/P
PL
20 37 37
I2E 20
II2ELwLs3B/P 20 13 20 37 37
II2ELwLs3P 20 13 20 37

Heating engineer
18
3
I2E(R)
BE
20 25
I2E(S) 20 25
I3P 37
I3P IS 30
I2H LV 20
I3B/P MT 30 30
I3B 30
The appliance gas supply pressure, both static and dynamic, must comply with the values in the Table, with a tolerance of ± 15%.
3.2.5 Vertical pipes and condensate
▶ Vertical gas pipes must be tted with siphon and dis-
charge of the condensate that may form inside the
pipe.
▶ If necessary, insulate the piping.
3.2.6 LPG pressure reducers
With LPG the following must be installed:
▶ A rst stage pressure reducer, close to the liquid gas
tank.
▶ A second stage pressure reducer, close to the appli-
ance.
3.3 COMBUSTION PRODUCTS EXHAUST
Compliance with standards
The appliance is approved for connection to a
combustion products exhaust duct for the types
shown in Table 1.2 p.13 .
3.3.1 Flue gas exhaust connection
▶ Ø 80 mm with gasket, on the rear, at the top (see di-
mensional diagrams, Paragraph 1.2 p.8 ).
3.3.2 Combustion air intake tting
▶ Ø 80 mm with gasket, on the rear, at the top (see di-
mensional diagrams, Paragraph 1.2 p.8 ).
3.3.3 Installation types
The lengths in following Tables are intended for
installations where the air and/or ue gas exhaust
ducts follow linear paths as shown in the respec-
tive Figures. Otherwise, you must proceed with
the calculation of the pressure drop (Paragraph
3.3.4 p.20 ).
If ducts other than those supplied by the manufac-
turer are used, make sure that they are suitable for
the unit on which they are installed. In particular,
the temperature class of the duct must be appro-
priate for the operating characteristics of the unit,
and must also respect the chemical-physical sta-
bility of the system itself.
Thematerialusedforthe uegasexhaustduct must
be class W1 according to EN 1443 and therefore
suitable to withstand the action of condensate of
combustion products from gaseous fuels.
In any case, use approved ducts according to the
type of installation to be made. Upon request,
Robur can supply rigid pipes, coaxial ducts and ter-
minals, all of approved type.
Gas unit heaters of the G series can be installed to one of
the following ways.
3.3.3.1 B23 type installation with wall ue gas exhaust
pipe
Figure3.1B23 type installation with wall ue gas exhaust pipe
A View from above
A
Table3.2B23 type maximum allowed length
Indicative maximum lengths (m)
Flue gas exhaust pipe
Ø 80 Ø 100 Ø 110
G30 23 30 30
G45 16 30 30
G60 12 30 30
G100 8 28 30

Heating engineer
Installation, use and maintenance manual – G gas unit heater 19
3
3.3.3.2 B23 type installation with roof ue gas exhaust
pipe
Figure3.2B23 type installation with roof ue gas exhaust pipe
Table3.3B23 type maximum allowed length with roof ue gas
exhaust pipe
Indicative maximum lengths (m)
Flue gas exhaust pipe
Ø 80 Ø 100 Ø 110
G30 20 30 30
G45 13 30 30
G60 9 30 30
G100 5 18 28
3.3.3.3 C13 type installation with separate ducts
Figure3.3C13 type installation with separate ducts
A View from above
1 Flue gas exhaust
2 Combustion air inlet
A
1 2
Table3.4C13 type maximum allowed length with separate
ducts
Indicative maximum lengths (m)
Air pipe Flue gas exhaust pipe
Ø 80 Ø 100 Ø 110 Ø 80 Ø 100 Ø 110
G30 17 30 30 17 30 30
G45 12 30 30 12 30 30
G60 9 30 30 9 30 30
G100 6 21 20 6 21 20
3.3.3.4 C13 type installation with wall coaxial terminal
Figure3.4C13 type installation with wall coaxial terminal
A View from above
A
Table3.5C13 type maximum allowed length with 80/125 wall
coaxial terminal and Ø 80 ducts
Indicative maximum lengths (m)
Air pipe Flue gas exhaust pipe
G30 11 11
G45 7 7
G60 4 4
G100 2 2
Table3.6C13typemaximumallowedlengthwith130/180 wall
coaxial terminal
Indicative maximum lengths (m)
Air pipe Flue gas exhaust pipe
Ø 80 Ø 130 Ø 80 Ø 130
G30 13 30 13 30
G45 9 30 9 30
G60 6 30 6 30
G100 4 30 4 30
3.3.3.5 C33 type installation with roof coaxial terminal
Figure3.5C33 type installation with roof coaxial terminal

Heating engineer
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3
Table3.7C33 type maximum allowed length with 80/125 roof
coaxial terminal and Ø 80 ducts
Indicative maximum lengths (m)
Air pipe Flue gas exhaust pipe
G30 8 8
G45 3 3
G60 - -
G100 - -
Table3.8C33 typemaximum allowedlength with100/150 roof
coaxial terminal
Indicative maximum lengths (m)
Air pipe Flue gas exhaust pipe
Ø 80 Ø 100 Ø 80 Ø 100
G30 11 30 11 30
G45 7 26 7 26
G60 4 17 4 17
G100 1 8 1 8
Table3.9C33 typemaximum allowedlength with130/210 roof
coaxial terminal
Indicative maximum lengths (m)
Air pipe Flue gas exhaust pipe
Ø 80 Ø 110 Ø 130 Ø 80 Ø 110 Ø 130
G30 13 30 30 13 30 30
G45 9 30 30 9 30 30
G60 5 30 30 5 30 30
G100 2 22 30 2 22 30
3.3.3.6 C53 type installation with separate ducts
Figure3.6C53 type installation with separate ducts
Table3.10C53 type maximum allowed length with separate
ducts
Indicative maximum lengths (m)
Air pipe Flue gas exhaust pipe
Ø 80 Ø 100 Ø 110
G30 1 19 30 30
G45 1 13 30 30
G60 1 9 30 30
G100 1 5 24 30
3.3.4 Sizing and installing combustion air/
exhaust fumes ducts
In order to dimension the duct system, the total pressure
drop of the system must be calculated.
The total allowed pressure drop in the ue gas exhaust
system depends on the unit model (Table 3.11 p.20 ).
The pressure drops of the ue and air pipes available as
Robur optional are shown in Table 3.12 p.21 .
Table 3.13 p.21 shows the pressure drops for Ø 100 ue
and air pipes in aluminium, available on the market.
The pressure drops of the coaxial pipes available as Robur
optional are shown in Table 3.14 p.21 .
Resistance from the separate terminals are negligible
since they are very low.
When designing, it must be checked that the total pres-
sure drop of the piping system is lower than the maximum
pressure drop allowed for the unit (Table 3.11 p.20 ). An
example of how to calculate pressure drops is given in
Paragraph 3.3.5 p.22 .
The maximum lengths of air and ue gas exhaust pipes,
depending on the type of installation, are shown in tables
under the installation type gures, described in Paragraph
3.3.3 p.18 .
The above lengths are intended to be approxi-
mate values for standard installations where the
air and ue gas exhaust ducts follow linear paths
as shown in the respective gures. Otherwise, you
must proceed with the calculation of the pressure
drop (Paragraph 3.3.5 p. 22 ): installation will be
permitted if the total pressure drop is lower than
the maximum admissible pressure drop (Table
3.11 p.20 ).
The Ø 80, 110 and 130 pipes available as Robur op-
tional are made of stainless steel, while the Ø 100
adapters available as Robur optional are made of
aluminium.
Table3.11Data for the calculation of the air/fumes system with pipes found on the market
G30 G45 G60 G100
Installation data
Flue temperature Nominal heat input G20 °C 85,0 95,0 85,0
Fumes ow rate Nominal heat input G20 kg/h 51 76 102 155
CO2percentage in fumes Nominal heat input G20 % 8,8 9,1 8,9 9,5
Flue gas exhaust residual head Pa 65 100 120 200