Robur B15 Generators Installation, User And Maintenance Manual

Installation, user and
maintenance manual

Series B15 Generators

Gas fired unit heaters
for heating medium areas

Methane gas powered

Revision: B
Code: D-LBR595

This manual has been drawn up and printed by Robur S.p.A.; whole or partial reproduction of
this manual is prohibited.
The original is filed at Robur S.p.A.
Any use of this manual other than for personal consultation must be previously authorised by
Robur S.p.A.
The rights of those who have legitimately filed the registered trademarks contained within this
publication are not affected.
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 manual without prior notice.

Installation, user and maintenance manual – Series B15 Generators

3

INDEX OF CONTENTS

1 PREFACE ............................................................................................................5

2 OVERVIEW AND TECHNICAL FEATURES ........................................................7

2.1 WARNINGS .......................................................................................................................................................................................7

2.2 NOTES ON OPERATION OF THE APPLIANCE ........................................................................................................................8

2.3 TECHNICAL MANUFACTURING CHARACTERISTICS........................................................................................................... 8

2.4 TECHNICAL DATA ........................................................................................................................................................................10

2.5 DIMENSIONS .................................................................................................................................................................................11

3 INSTALLATION ................................................................................................13

3.1 GENERAL INSTALLATION INSTRUCTIONS ...........................................................................................................................13

3.2 SIZING AND INSTALLING THE COMBUSTION AIR/FUMES EXHAUST TUBES ...........................................................15

3.3 BRACKET INSTALLATION ...........................................................................................................................................................20

3.4 INSTALLING THE WALL PANEL.................................................................................................................................................21

3.5 SETTING THE GAS VALVE ..........................................................................................................................................................22

3.6 WIRING DIAGRAMS .....................................................................................................................................................................24

4 USE AND OPERATION ....................................................................................29

4.1 SWITCHING ON AND SWITCHING OFF .................................................................................................................................29

5 SERVICE AND ASSISTANCE ...........................................................................31

5.1 MALFUNCTIONS ..........................................................................................................................................................................31

5.2 CLEANING THE REMOVABLE BURNER ..................................................................................................................................31

4

Installation, user and maintenance manual – Series B15 Generators

5

1 PREFACE

The present "Installation, user and maintenance manual" is intended for anyone who is to
install or operate Robur series B15 hot air generators.
In particular, the booklet is intended for the plumber who will install the generator, the
electrician who will connect it to the mains power supply and the final user who will con­trol it during everyday operation.
The booklet is also intended for technical service staff charged with the main service
tasks.

Summary

The booklet has 5 sections:
SECTION 1 is a brief introduction to the use of the manual itself
SECTION 2 is intended for use by the final user, hydraulic and electrical installation
technicians and the service technician; it gives general warnings, operating instructions
and constructional specifications for the B15 series.
SECTION 3 is intended for use by the hydraulic and electrical installation technicians; it
provides the information required to install series B15 generators correctly.
SECTION 4 is intended for use by the final user; it provides the information required to
operate series B15 generators correctly.
SECTION 5 is intended for use by technical service technicians; it provides the informa­tion required to adjust the gas flow and run gas type changeovers. It also includes service
instructions.
The icons used in the manual have the following meanings:

= DANGER

= WARNING

= NOTE

= START OF OPERATING PROCEDURE

= REFERENCE to another part of the manual or other document

6

Installation, user and maintenance manual – Series B15 Generators

7

2 OVERVIEW AND TECHNICAL FEATURES

This section contains general instructions regarding the installation and operation of
series B15 generators, and a brief section about the operation of generators, their con­struction and technical data.

2.1 WARNINGS

This manual constitutes an integral and essential part of the product and must be deliv­ered to the user together with the appliance.
The appliance must only be used for the purposes for which it has been designed. Any
other use must be considered inappropriate and therefore dangerous.

The appliance is not intended to be used by persons (including children) whose physical,
sensory and mental capacities are impaired, or who lack the necessary experience and
knowledge, unless they are supervised or instructed in its use by persons responsible for
their safety. Children must be supervised to ensure that they do not play with the
appliance.

The manufacturer is exempt from any contractual or extra-contractual responsibility for
damage caused by errors of installation, use and in any case the non-observance of the
instructions supplied by the manufacturer.
The appliance must be installed in accordance with established legislation.
Do not obstruct the fan intake or the outlet grilles.

In the event of failure of the appliance and/or breakage of any of its parts, deactivate it
by disconnecting it from the electrical and gas supplies, and refrain from any attempt to
repair and/or restore operation of the appliance through direct action.

Any repair may be carried out solely by a ROBUR Technical Assistance Centre, using
only original replacement parts.
The non-observance of the foregoing warnings may compromise the safety of the
device.
For correct operation, the appliance must be overhauled annually as per the manufac­turer’s instructions, by professionally qualified service personnel.
.
,

“Professionally qualified personnel” is defined as those possessing specific technical com-

petence in the residential heating equipment sector. Contact ROBUR S.p.A. Technical As­sistance Centre (tel. +39.035.888.111) for any further information.

If the appliance is put out of service for a long time, refer to paragraph 4.1 SWITCHING ON
AND SWITCHING OFF → 29.
If the appliance is to be sold or transferred to another owner, ensure that this booklet is
handed over to the new owner and installation technician for their reference.
Before starting up the generator, have the following items checked by professionally
qualified personnel :

the electricity and gas mains specifications correspond to the specifications on the t

nameplate;

the fumes exhaust tubes are operational;t

the combustion air and fumes exhaust are in accordance with established t

legislation;

8

the gas supply seals, both internal and external;t

the gas flow rate setting as required by the generator’s power rating;t

the gas supplied to the appliance is of the type for which it is designed;t

the gas supply pressure in relation to the admitted range specified on the t

nameplate;

the gas supply system is correctly rated for the capacity required by the appliance, t

and that it is equipped with all safety and control devices prescribed by current
regulations.

Do not use gas pipes to ground electrical appliances.

IF YOU SMELL GAS:

Do not operate electrical switches, the phone or any other equipment which may t

generate sparks.

Immediately open the doors and windows to allow fresh air to enter the area.t

Close the gas valve.t

Contact professionally qualified personnel for assistance.t

2.2 NOTES ON OPERATION OF THE APPLIANCE

The series B15 hot air generator is an independent heating appliance with sealed circuit
and forced draw.
The appliance can be used with natural gas (G20).
It is designed for installation inside the room to be heated.
The combustion circuit is sealed in relation to the room and corresponds to the require­ments of EN 1020 for type C appliances: the combustion air intake and fumes exhaust are
outdoors and are driven by a blower in the combustion circuit.
The appliance is homologated as type B for installations in which the combustion air is
drawn directly from the room itself.
The generator is controlled by a room thermostat (not supplied). When the thermostat
trips, the controller waits for a pre-plunge delay of around 40 seconds, and then ignites
the burner.
The detection electrode senses the flame. If it fails to detect a flame, the controller locks
out the appliance.
Combustion products are sent through the heat exchangers which are subject to an ex­ternal flow of air from the fan, thus delivering hot air to the room.
The flow of air can be adjusted vertically with the horizontal fins of the delivery grille.
On request, a vertical fins kit is available to enable the direction of the flow of air to be
adjusted horizontally.
If the heat exchangers overheat due to a malfunction, a limit thermostat trips and shuts
off power to the gas valve, which in turn cuts off the supply of gas to the burner. The gen­erator must be reset manually once the limit thermostat has tripped, using the remote
control.
A blower upline of the burner mixes the air and gas and expels the combustion fumes.
The generator can run in HEATING mode (WINTER mode) and also provides a pleasant
flow of fresh air during the summer in FAN ONLY mode (SUMMER mode). For further
information see paragraph "4.1 SWITCHING ON AND SWITCHING OFF → 29".

2.3 TECHNICAL MANUFACTURING CHARACTERISTICS

Series B15 hot air generators are supplied complete with:

Installation, user and maintenance manual – Series B15 Generators

9

tpre-mix burner in stainless steel.

thigh head blower.

tcylindrical combustion chamber in stainless steel.

theat exchangers in corrugated stainless steel with a very large exchange

surface.

texternal panelling in steel with epoxy powder enamel finish.

thigh capacity axial fan.

tCONTROL AND SAFETY COMPONENTS:

tcontroller board, with CPU: controls burner ignition, flame detection; blow-

er speed control, fan speed control.

Power voltage: 230 V - 50 Hz.t

Safety time: 5 seconds.t

Pre-plunge time: 5 seconds.t

Model: Bertelli & Partners DIMS05 with ignition transformer.t

tlimit thermostat set to 100°C, automatic reset, to prevent heat exchanger

overheating.

tGas solenoid valve: if a safety device trips (limit thermostat) the gas valve

is de-excited, thus cutting off gas supply to the burner.

Power voltage: 230 V - 50 Hz.t

Operating temperature: 0° C to +60° C.t

Model: SIT 830 Tandem / BM 762.t

Figure 2.1

Electrical panel.

LEGEND

A transformer 230/24 V AC
B ignition transformer
C terminal block with fuse
D limit thermostat
E controller

A

B

C

E

D

10

2.4 TECHNICAL DATA

Table 2.1 – Technical data.

TECHNICAL CHARACTERISTICS unit of measurement B15
appliance category I

2H

appliance type C13-C33-B23-C63-C53
gas natural (methane) G20
thermal capacity nominal kW 15
thermal power nominal kW 13,8
gas consumption

(1)

natural (G20) m3/h 1,59
efficiency nominal % 92
gas supply pressure natural gas (G20) mbar 20
gas fitting dia. "G 3/4 F

fumes/combustion air fitting dia.

air intake mm 80
fumes outlet mm 80

electrical power

voltage V 230
TYPE single-phase

frequency 50 Hz supply 50
electrical power absorption nominal w 160
fuse - A 3.15
operating temperature

(2)

in room °C 0 ÷35

air flow

(3)

nominal m3/h 1900
thermal differential - k 21,3
air throw

(4)

residual speed > 1m/s m 12
sound level at 6 m open area dB(A) 40
sound level at 6 m typical installation dB(A) 52
weight - kg 30

Technical data.

Notes:

At 15 °C - 1013 mbar.1.
WARNING: The operating temperature IN THE ROOM is 0 °C/+35 °C; The operating 2.
temperature OF THE APPLIANCE’S COMPONENTS is 0 °C/+60 °C;
At 20 °C - 1013 mbar.3.
Values measured in an open area; in a real installation, the thermal flow may reach 4.
GREATER distances than those given here (depending on the height of the ceiling
and its thermal insulation).

Installation, user and maintenance manual – Series B15 Generators

11

2.5 DIMENSIONS

Figure 2.2

Series B15 dimensions.

LEGEND

1 fumes outlet fitting
2 combustion air intake fitting
3 power cable inlet
4 gas fitting
A front view
B side view
C rear view

12

Installation, user and maintenance manual – Series B15 Generators

13

3 INSTALLATION

3.1 GENERAL INSTALLATION INSTRUCTIONS

The installation must be done, as instructed by the manufacturer, by tprofession-

ally qualified personnel.

tProfessionally qualified personnel is defined as those possessing specific techni-

cal competence in the residential heating equipment sector. Contact ROBUR S.p.A.
Presales (tel. +39.035.888.111) for any further information.

Incorrect installation may cause damage to persons, animals or things, for which t

the manufacturer is not liable.

The installation must be done in accordance with established local and national t

regulations, in particular:

Italian Ministerial Decree of 12 April 1996 containing fire prevention regula-t

tions regarding the design, construction and operation of heating systems
supplied with gas fuel;

Italian Decree n. 412/93 governing the design, installation, operation and t

maintenance of heating systems;

Italian Decree n. 551/99 which introduces certain modifications to D.P.R. n. t

412/93;

Italian Law n. 46/90 and its actuating regulation (D.P.R. 447/91) regarding the t

safety of heating systems;

UNI CIG 7129 governing the installation of appliances supplied with natural t

gas;

Italian Law n. 186 of 1 March 1968 regarding the installation of electrical t

systems.
On the basis of the installation design, set out the gas and electrical supply lines, as well as
the appliance’s supporting brackets. The appliance may be installed horizontally, at an an­gle or vertically (air flow downwards), using the optional mounting bracket (3.1 → 13).

Figure 3.1

Possible installation positions for series B15 generator.

During the installation, observe the following precautions:

Unpack the appliance, and check it for damage suffered during shipping; each ap-t

pliance is factory tested before shipping; if it is damaged, notify the shipping agent
immediately.

Allow a clearance of at least 300 mm between the back of the appliance and the t

wall for an adequate air supply (see Figure 3.2 → 15).

The optimal recommended height from the ground of the generator’s base is 2.5 t

m (see Figure 3.2 → 15). Do not install the appliance at less than 2.20 m above the
ground.

14

A cut-off valve and three-piece coupling must be fitted on the gas supply.t

Check that there is an adequate mains gas supply. In particular: make sure that the t

gas mains pressure, with the appliance operating, is set to 20 mbar (204 mm H2O)
with an admissible range of 17 mbar to 25 mbar (G20 natural gas supply).

Hook the appliance up as shown in the installation wiring diagram (see Figure t

3.11 → 24), and make sure the power supply is rated at 230 V 1N - 50Hz. Make
sure that:

the electricity mains specifications correspond to the specifications on the t

nameplate;

the cable is of the type H05 VVF 3x1.5 mmt

2

with a maximum external diameter

of 8.4mm;

ensure that the ground cable is longer than the live cables. In this way it will be t

the last wire to be pulled away if the mains cable should accidentally be pulled,
and will thus guarantee the ground connection.

The electrical safety of the appliance is guaranteed only when it is correctly connected to
an efficient grounding system, executed in accordance with current safety regulations.
Do not use gas pipes to ground electrical appliances.

The appliance must be connected to the mains cable via a two-pole switch with t

minimum air gap 3 mm. A two-pole switch is one which opens both the phase and the
neutral contacts. Thus both contacts will be open when the switch is opened.

tIt is obligatory to equip the installation with a room thermostat connected to

the appliance as shown in the installation wiring diagram (see Figure 3.11 → 24).
Locate the thermostat (or its sensor) around 1.5 m off the floor, shielded from
draughts, direct sunlight, direct heat sources (lamps, the appliance’s hot air output,
etc.) and preferably NOT on an external wall, as this will compromise its tempera-
ture reading and hence the operation of the installation. THIS PREVENTS UNDE-

SIRABLE OPERATING CYCLES AND ENSURES OPTIMAL HEATING COMFORT IN
THE ROOM.

As an alternative to the room thermostat, use one of the accessory adjustment and t

programming units.

The control cables (especially those connected to the wall panel and temperature sensors)
must be protected from interference generated by power cables. This can be achieved,
for example, by shielding the cables or routing them through ducts separate from power
cables.

For best results, comfort and efficiency, observe the following rules:t

make sure that the air flow is not directed towards persons (adjust its direction t

with the grille fins)

take any obstacles into account (columns, etc.).t

fro better heat distribution, in multiple appliance installations, provide alter-t

nating hot air flows (see Figure 3.3 → 15).

Installation, user and maintenance manual – Series B15 Generators

15

Figure 3.2

Clearances: minimum clearance required for installation.

350

Min 2,5 m
Max 3,5 m

Min 200 A A

Min 400

2,2 ÷ 3,0 [m]

(min/max)

300

Figure 3.3

Example of generator positioning.

3.2 SIZING AND INSTALLING THE COMBUSTION AIR/FUMES EXHAUST
TUBES

Series B15 hot air generators can be installed in one of the following ways.

16

Typet B

23

installation: this type has the combustion air intake inside the room and
the fumes exhaust outdoors via a dedicated tube, which may be either horizontal
or vertical. In this case, the appliance is not sealed off from the room (see Figure

3.5 → 17).

Typet C

13

installation: The fumes exhaust and the air intake are routed in coaxial or
separate horizontal tubes (or wall-mounted, see Figure 3.6 → 19). In this case, the
appliance is sealed off from the room.

Typet C

33

installation: the fumes exhaust and the air intake are routed in coaxial or
separate vertical tubes (or roof-mounted, see example C33 in Figure 3.7 → 19). In
this case, the appliance is sealed off from the room.

Typet C

53

installation: the fumes exhaust and the air intake are routed in separate
tubes which exit outside the building and at a distance from each other. This type
of installation enables implementation of air intake, for example, with horizontal
tubes (or wall-mounted) behind the appliance, and the fumes exhaust distant from
the appliance with a horizontal or vertical tube (or roof-mounted, see example C53
in Figure 3.7 → 19). In this case, the appliance is sealed off from the room.

Typet C

63

installation: this type enables the implementation of fume/air instal­lations using commercially available tubes, bends and terminals (homologated).
Furthermore, it enables the use of tubes of diameter greater than 80 mm: fro ex­ample when very long air/fumes systems are required. In this type of system, the
calculation of the sir/fumes system requires the data provided by the tubes manu­facturer, as well as the composition, flow rate and temperature of the fumes them­selves (see Table 3.1 → 17).

In any case, always use tubes which are homologated for the type of installation in
question. ROBUR S.p.A. can provide homologated rigid tubes, coaxial tubes and
terminals.

In order to dimension the system of tubes, you must calculate the total pressure drop of
the system.
The total admitted pressure drop is given in Table 3.1 → 17. The pressure drops of the fumes,
air and coaxial tubes supplied by ROBUR, are given in Table 3.2 → 17 (for dia. 80 and 100).
The pressure drops of external terminals need not be considered as they are negligible.
When designing the system, check that the sum of pressure drops of the system of tubes
is less than the maximum pressure drop permitted for the appliance (see Table 3.1 → 17).
The following pages give an example calculation of the pressure drop.
For the maximum admitted lengths (APPROXIMATE) for the air and fumes tubes, depend­ing on the type of installation in question, refer to Table 3.3 → 18 and the note following
it.

If the horizontal fumes tubes are longer than 1 metre, to prevent condensation return­ing to the appliance, the tube must be installed at a downwards slope of 2 or 3 cm per
metre of length (see Figure 3.4 → 17). Furthermore, for a correct installation of the ex­ternal fumes exhaust and air intake terminals, observe the instructions given in Figure

3.8 → 20.

Installation, user and maintenance manual – Series B15 Generators

17

Figure 3.4

horizontal tube slope.

LEGEND

p(%) tube slope *

* slope to be provided: -2% or -3% (downwards).
example:
slope (downwards) of 2 cm per metre or 3 cm per metre

p(%)

If the fumes tubes are vertical, to prevent condensation from returning to the appliance,
equip the base of the vertical tube with a "T" junction to collect the condensate (see ex­ample "B" in Figure 3.5 → 17).

Figure 3.5

B23 type installations: with wall-mounted exhaust and roof-mounted exhaust.

LEGEND

A type B23 installation with hori-

zontal exhaust (or wall-mounted)
[B15 generator: seen from above]
B type B23 installation with vertical

exhaust (or roof-mounted)
[B15 generator: side view]
1 combustion air intake
2 fumes exhaust
3 condensation outlet

1

2

A

3

2

B

B15

B15

Table 3.1

DATA FOR CALCULATING THE AIR/FUMES SYSTEM WITH COMMERCIALLY AVAILABLE TUBES

Fumes outlet temperature [°C] Fumes mass flow rate [kg/h]

CO

2

content of fumes [%] (with

G20 gas)

Admitted pressure drop [Pa]

175 25,9 9,2 ÷ 9,4 60

Data for calculating the air/fumes system with commercially available tubes.

Table 3.2

PRESSURE DROP OF DIA. 80 COMPONENTS PRESSURE DROP OF DIA. 100 COMPONENTS
tube [Pa/m] 90° bend [Pa] coaxial [Pa] tube [Pa/m] 90° bend [Pa] coaxial [Pa]

fumes air fumes air

wall
O-SCR007

roof
O-SCR008

fumes air fumes air roof O-SCR009

0,7 0,4 1,0 0,9 1,6 2,0 0,2 0,2 0.35 0,25 1,0

Dati per il calcolo del sistema aria/fumi con condotti Ø 80 o Ø 100 forniti da Robur Spa.

18

Each "T" junction increases the effective length of the tube to which it is mounted by 3
metres. For example, if the junction is fitted to a 2 metre fumes tube, when calculating
the pressure drop you must deem the total length of the tube to be 5 metres. Each 5°
bend increases the effective length of the tube to which it is mounted by 1.2 metres. For
example, if the bend is fitted to a 2 metre air tube, when calculating the pressure drop
you must deem the total length of the tube to be 3.2 metres.

Table 3.3

APPROXIMATE ADMITTED MAXIMUM LENGTHS [m] - by TYPE of installation
B23 C13 C33 C53

fumes tube

separate
tubes

coaxial wall-mounted coaxial roof-mounted

separate
tubes

dia. 80 dia. 80

dia. 125
O-SCR007

dia. 180 O-KTC004

dia. 125
O-SCR008

dia. 150 O-SCR009 dia. 210 O-KTC001 dia. 80

Horizontal Vertical - dia. 80 tubes dia. 130 tubes dia. 80 tubes dia. 100 tubes dia. 130 tubes ­fumes fumes air/fumes air/fumes air/fumes air/fumes air/fumes air/fumes air/fumes
30 30 25+25 20+20 N/A 25+25 30+30 N/A 1+25

Approximate maximum lengths.

The above maximum admitted lengths are to be considered APPROXIMATE and apply
to installations in which the tubes (air and fumes) are routed linearly as shown in Figure

3.5 → 17; Figure 3.6 → 19 and Figure 3.7 → 19. If this condition does not apply, you
must calculate the pressure drop (see "EXAMPLE CALCULATION" below): the installation

is permitted only if the total pressure drop is less than the admitted pressure drop

(see 3.1 → 17).

EXAMPLE CALCULATION
We are to install a B15 with separate tubes, dia. 80, as follows:

7 metres of fumes tube dia. 80;t

2 90° bends dia. 80 on the fumes tube;t

6 metres of air tube dia. 80.t

We can now calculate the pressure drop (see Table 3.4 → 18), bearing in mind that the
total admitted pressure drop is 60 Pa.

Table 3.4

COMPONENT Quantity [m] Pressure drop [Pa/m] Pressure drops [Pa]
Dia. 80 fumes tube 7 x 0,7 = 4,9
90° bends 2 x 1,0 = 2,0
Dia. 80 air tubes 6 x 0,4 = 2,4
TOTAL PRESSURE DROP = 9,3

Example numerical calculation.

The total pressure drop is less than the admitted pressure drop (9.3 Pa less than
the maximum admitted figure of 60 Pa) and hence the installation is PERMITTED.
If the installation had turned out to be not permitted due to excessive pressure drop, we
could have adopted one of the following measures:

reduce the length of the air/fumes tubes;t

increase the diameter of the tubes to dia. 100.t

For special installations, phone ROBUR Presales at +39.035.888.111.

Installation, user and maintenance manual – Series B15 Generators

19

Figure 3.6

C13 type installations.

LEGEND

C13 C13 type installations
V1 generator, seen from above
E1 example with separate

wall-mounted ducts

E2 example with coaxial wall-

mounted duct
A combustion air intake
F fumes exhaust

Figure 3.7

C33 and C53 type installations.

LEGEND

V1 generator, front view
V2 generator, side view
A combustion air intake
F fumes exhaust
S.C condensation outlet
C33 type C33 installation
C53 type C53 installation

20

Figure 3.8

Wall terminal position.

LEGEND

IN combustion air intake
OUT fumes exhaust
A recommended position (OK)
B admitted position (OK)
C NOT admitted position (NO)

IN

OUT

A

IN

OUT

B

IN

OUT

C

3.3 BRACKET INSTALLATION

USING ROBUR SUPPORTING BRACKETS

ROBUR S.p.A. provides easy to install mounting brackets as accessory equipment for the
series B15 generator [accessory code: O-STF019].
To install the appliance using the Robur (O-STF019) mounting bracket:

install the bracket to the appliance as explained in the instructions supplied with 1.
the O-STF019 mounting bracket itself;
follow the instructions given in Paragraph 3.1 GENERAL INSTALLATION INSTRUC-2.
TIONS → 13 and Figure 3.2 → 15;
drill n. 4 holes into the wall (through its entire thickness) in line with the 4 holes in 3.
the wall plate supplied with the Robur bracket;
secure the generator’s mounting bracket to the wall using the counterplate sup-4.
plied with the Robur bracket: secure the counterplate (located on the outside of
the wall) to the wall plate (on the inside of the wall) with 4 M10 bolts.

Observe the warnings given in the Robur O-STF019 bracket’s assembly instructions.

USING SHELVES (not supplied by Robur)

If he opts not to use Robur mounting accessories, the installer must not only observe the
instructions given in Paragraph 3.1 GENERAL INSTALLATION INSTRUCTIONS → 13 and
Figure 3.2 → 15, but must also employ a shelf which satisfies the specifications of Figure

3.9 → 21.

The shelf must be sufficiently robust for its intended use and able to support the weight
of the appliance (see Table 2.1 Technical data. → 10) plus its own.

Installation, user and maintenance manual – Series B15 Generators

21

Figure 3.9

Installation with supporting bracket provided by installer.

LEGEND

S supporting plate
P wall-mounted plate (and counterplate)
a generator base mounting hole spacing
c generator rear mounting hole spacing
b generator base/rear support plane line

of intersection
v generator mounting bolts (*)
D detail of "b-c"

* use (n. 4):
spring washer 6.4x12.5 UNI 6592-69-R4O galvanised
washer D.6 UNI 8842 A6 galvanised
bolts UNI EN 24017-M6x20-8.8 galvanised

a

b

176 mm

D

S

v

v

b

c

12 mm

D

MIN 300 mm

340 mm

90 mm

P

430 mm

a

3.4 INSTALLING THE WALL PANEL

Series B15 appliances are supplied with a wall panel with: summer/winter button and
reset button with lockout led (Figure 4.1 → 29). The panel should be installed on the wall
in an appropriate position. It connects to the appliance as shown in Figure 3.11 → 24.

This must be done by a qualified technician, as instructed in Paragraph 3.1 GENERAL

INSTALLATION INSTRUCTIONS → 13 . Make sure that the cables are not live when making
the connection. Each wire must have at least a 1 mm cross section.

To install the wall panel, proceed as follows:

after having found a suitable location (at most 100 metres away from the genera-1.
tor itself), install it with the expansion bolts;
then route the cable (FROH 8x1 mm2.

2

) of a suitable length (maximum 100 metres);
shut off power to the appliance;3.
open the hatch on the appliance and connect the cable to the terminal block, as 4.
shown in the installation wiring diagram, Figure 3.11 → 24 (see connection details
"E/I" and "Reset");

Terminals "Z9-Z9" on the appliance’s terminal block are intended for hooking up a
room thermostat (see connection detail "T.A" - in the Figure 3.11 → 24). Terminals
"Z9-Z9" enable you to control multiple generators with a single external enable
signal (e.g.: analogue thermostatic programmer, clock, etc.) as shown in the con­nection examples in Figure 3.12 → 25, Figure 3.13 → 26 and Figure 3.14 → 27.

restore the appliance.5.

Now check the operation of the appliance to ensure the connections have been
made correctly. With reference to the procedures given in Paragraph 4.1 SWITCH­ING ON AND SWITCHING OFF → 29:

22

activate FAN ONLY mode;6.
activate HEATING mode;7.
in HEATING mode, close the gas supply line and check that the lockout led on the 8.
reset button "B" lights up after a few seconds (detail "3" - Figure 4.1 → 29);
now check that when you open teh gas cock and press reset button "B", the lockout 9.
led goes out and the generator starts up again;

If the appliance behaves in any other way than specified in the procedures in Paragraph

4.1 SWITCHING ON AND SWITCHING OFF → 29 or exhibits any anomalous behaviour,
this indicates a possible wiring error. Check the connections and if the anomaly persists,
contact your local TAC or Robur Spa Service (tel. +39.035.888.111).

CONTROLLING MULTIPLE APPLIANCES WITH A SINGLE EXTERNAL ENABLE SIGNAL

Terminals "Z9-Z9" enable you to control multiple generators with a single external enable
signal (e.g.: analogue thermostatic programmer, clock, etc.).
There are three possible control options as shown in Figures 3.12 → 25, 3.13 → 26 and

3.14 → 27:

control of multiple appliances with a single programmer and multiple room t

thermostats;

control of multiple appliances with a single programmer and a single room ther-t

mostats (with multiple relays);

control of multiple appliances with a single programmer and a single room ther-t

mostats (with a single relay).

3.5 SETTING THE GAS VALVE

For correct operation of series B15 generators, the gas valve must be set to the values
given in Table 3.5 → 23. The appliance is shipped with the gas valve already set.
If further adjustment should be necessary, proceed as explained below (see Figure

3.10 → 23).

The adjustment must be done by professionally qualified personnel. ROBUR S.p.A. has
a network of Assistance Centres which can be contacted via your reseller, area agent, or
by phoning ROBUR S.p.A. Customer Assistance tel. [phone].

You will need: the appliance connected to the power/gas supply. Necessary equip-
ment and materials.

Connect a pressure gauge to pressure fitting "B", after having slackened off the seal 1.
screw.

If using a differential gauge, connect gas valve fitting "B" to the gauge’s + (positive)
terminal.

Turn on the appliance and wait for the flame to reach a steady state (around 2 2.
minutes).
Operation with hatch open: remove its cap with a screwdriver and adjust offset 3.
adjuster screw "A" (you will need a 4 mm allen key) to the nominal value given in

3.5 → 23.

Installation, user and maintenance manual – Series B15 Generators

23

Table 3.5

OFFSETS
OFFSET [mbar] [Pa]
nominal 0,1 10

Offsets.

Check that the CO1.

2

percentage is as given in 3.1 → 17. If it is not, adjust the offset
again until the CO2 percentage is as given in 3.1 → 17.
Turn the appliance off and back on again two or three times to check that the new 2.
setting is stable.
Disconnect the pressure gauge and screw pressure fitting "B" seal screw back in 3.
again.
Restore the appliance, making sure to fit the cap onto screw "A".4.

Figure 3.10

Gas Valve.

LEGEND

A offset adjuster screw
B outlet gas pressure fitting
C inlet gas pressure fitting

A B

C

24

3.6 WIRING DIAGRAMS

Figure 3.11

Installation diagram.

LEGEND

vedi disegno

Installation, user and maintenance manual – Series B15 Generators

25

Figure 3.12

Installation of multiple appliances with a single programmer and multiple room thermostats.

LEGEND

P programmer
TA room thermostat
RL1-2-3 programmed control relay
GR ground
L-N single-phase line (230 V - 50 Hz)
A wall-mounted generator
Z9 generator internal terminals

26

Figure 3.13

Installation of multiple appliances with a single programmer and a single room thermostat (solution with multiple relays).

LEGEND

P programmer
TA room thermostat
RL1-2-3 programmed control relay
GR ground
L-N single-phase line (230 V - 50 Hz)
A wall-mounted generator
Z9 generator internal terminals

Installation, user and maintenance manual – Series B15 Generators

27

Figure 3.14

Installation of multiple appliances with a single programmer and a single room thermostat (solution with a single relay).

LEGEND

P programmer
TA room thermostat
RL programmed control relay
GR ground
L-N single-phase line (230 V - 50 Hz)
A wall-mounted generator
Z9 generator internal terminals

28

Installation, user and maintenance manual – Series B15 Generators

29

4 USE AND OPERATION

4.1 SWITCHING ON AND SWITCHING OFF

The first start up must be done by professionally qualified personnel.

Before starting up the generator, have it checked by professionally qualified personnel:

the electricity and gas mains specifications must correspond to the specifications t

on the nameplate;

the calibration must be compatible with the generator’s power rating;t

the fumes exhaust tubes are operational;t

the combustion air and fumes exhaust must be in accordance with established t

legislation.

WINTER MODE

To activate HEATING mode, proceed as follows:

You will need: the appliance connected to the power/gas supply.

Set the room thermostat to its maximum.1.
Check that the gas valve is open.2.
Power up the appliance with the master power switch.3.
Set button "A" (summer/winter button) to 4. Winter ("snowflake" ICON; detail "1" - Fig­ure 4.1 → 29).
After the pre-plunge time (around 40 seconds), the gas solenoid valve opens and 5.
the burner ignites.
The appliance’s controller keeps the valve open so long as it detects the flame.6.
If it does not, the controller locks out the appliance and turns on the lockout led 7.
on the reset button "B" (detail "3" - Figure 4.1 → 29): if this occurs, press the reset
button "B".
Once he burner has ignited, set the room thermostat to the desired value.8.

Figure 4.1

Wall panel.

LEGEND

A summer/winter button
B reset button
1 "snowflake" icon (winter position)
[for heating operation]
2 "sun" icon (summer position)
[for ventilation operation only]
3 lock-out led

A B

1

2

3

SWITCHING OFF

To switch off the appliance, proceed as follows:

You will need: the appliance operating (switched on).

30

Set the room thermostat to its minimum.t

The burner will go out, whereas the fan will continue running so long as the appliance is
still warm.

Do not switch off the appliance by shutting off its power supply as this can severely dam­age it by stopping the fan and tripping the limit thermostat (automatic reset).

The limit thermostat ONLY trips during malfunctions. Before resetting it, troubleshoot the
problem (in this case, overheating). If it trips frequently, contact ROBUR TAC.

SUMMER MODE

To activate FAN ONLY mode, proceed as follows:

You will need: the appliance connected to the power/gas supply.

Close the gas valve and check that the appliance is powered up.1.
Set button "A" (summer/winter button) to 2. Summer ("sun" ICON; detail "2" - Figure

4.1 → 29): this runs only the fan, to refresh the air in the room.

PROLONGED PERIODS OF DISUSE

If the appliance is put out of service for a LONG TIME (i.e., seasonal disuse), proceed as
follows:

Switch the appliance off and wait for the fan to stop running.t

Close the gas cock upline of the appliance.t

If you have no intention of using SUMMER mode, switch off the power supply to t

the appliance with the master power switch on the power cable.

SWITCHING THE APPLIANCE BACK ON: after a long period of disuse, it may be neces-
sary to start up the appliance several times, due to air in the tubes.

Installation, user and maintenance manual – Series B15 Generators

31

5 SERVICE AND ASSISTANCE

5.1 MALFUNCTIONS

Before taking any particular measures, always check that:

the power supply is present: 230 V ± 10% 50 Hz with an effective ground plant;t

the gas supply is present;t

the gas pressure and flow rate must be in the range specified by the t

manufacturer.

A lower pressure than that indicated by the manufacturer corresponds to an insufficient
gas supply. The causes may include:

insufficient gas flow meter;t

excessive length/number of bends in the gas pipe for the dia. in use.t

Only if the appliance passes these basic checks, proceed to troubleshoot the problem in
question.

Before opening the appliance’s side hatch to access its electrical panel, SHUT OFF POWER
to the appliance with the master power switch on its power cable.

Table 5.1

LED ON DESCRIPTION OF MALFUNCTION CAUSE RESPONSE

steady

Flame locked out due to failure to ignite
burner

t5IFJHOJUJPOFMFDUSPEFTBSFCSPLFOPSCBEMZ

located.

t5IFEFUFDUJPOFMFDUSPEFJTCSPLFOPSCBEMZ

located, or is in contact with the appliance’s metal
frame.

t$JSDVJUCPBSEFMFDUSJDBMDPOOFDUJPOGBJMVSF

t(BTWBMWFFMFDUSJDBMDPOOFDUJPOGBJMVSF

t*OFõFDUJWFHSPVOEQMBOU

t"JSJOUIFHBTIPTFPSOPHBTTVQQMZ

t*ODPSSFDUHBTWBMWFTFUUJOH

Reposition or replace the electrodes.
Reposition or replace the electrode.
Replace the circuit board.
Replace the gas valve.
Restore the ground plant.
Vent the air in the gas hose.
Reset the gas valve.
Once the cause of the malfunction has been
identified and eliminated, press button B on the
wall panel (see figure 4.1 → 29).

flashing (on: 4 sec; off:
1 sec)

Limit thermostat tripped due to
overheated heat exchangers.

t%JSUBDDVNVMBUJPOPOUIFBJSJOUBLF

t%FMJWFSZPVUMFUCMPDLFE

t'BONBMGVODUJPO

t(FOFSBUPSQPXFSGBJMVSFEVSJOHPQFSBUJPO

Once the cause of the malfunction has been
identified and eliminated, reset the limit
thermostat pressing button B on the wall panel
(see figure 4.1 → 29).

flashing (on: 1 sec; off:
4 sec)

Blower failure.

t1PPSFMFDUSJDBMDPOOFDUJPOT

t#MPXFSNPUPSNBMGVODUJPO

t1PPSQFSGPSNBODF

The malfunction indication is automatically reset
once the cause of the malfunction has been
eliminated.

malfunction NOT
indicated by wall panel

The burner switches off and does not
start again even if the room temperature
requires it to do so.

t5IFSPPNUIFSNPTUBUJTQPTJUJPOFEJOTVDIBXBZ

as to be affected by sources of heat or the flow
of hot air.

Reposition the room thermostat.

Malfunctions.

5.2 CLEANING THE REMOVABLE BURNER

The burner of series B15 generators can be removed: this is especially useful for
cleaning.

The burner should be cleaned every two years. If the appliance is installed in especially

dirty conditions (in the presence of welding and grinding equipment or other machin­ery) clean the burner once a year before the start of the winter season.

The burner must be removed and cleaned by professionally qualified personnel. In-

correct or careless assembly of the gas circuit can result in hazardous gas leaks along the
circuit, especially in the areas directly affected.

To clean the burner, proceed as explained below (see Figure 5.1 → 32).

32

You will need: generator powered off, with master power switch set to "OFF" and gas
valve set to "CLOSED".

Open the generator’s hatch.1.
Undo the hexagonal ring nut connecting the gas pipe to the nozzle mount fitting.2.
Move the gas pipe aside and remove the nozzle.3.
Undo the four bolts securing the blower screw.4.
Remove the deflector and its gasket.5.
Slacken off the four bolts securing the burner and when it is resting on the base, 6.
completely unscrew it and remove it.
Fit a tube into the burner (do not bend, damage or tamper with the deflector in-7.
side the burner), and exert upwards pressure to extract the burner.
Clean the burner with compressed air.8.
Refit the burner (with its cavity uppermost).9.
Fit the lower bolts, then the upper ones and then tighten them all down in a cross-10.
wise pattern.
Refit the diaphragm and its gasket.11.
Fit the blower screw with its four bolts.12.
Fit the nozzle and its gasket into the nozzle mount.13.
Tighten down the hexagonal ring nut connecting the gas pipe to the nozzle mount 14.
fitting.

Figure 5.1

Removing the gas tube.

LEGEND

* use a 30 mm wrench on the gas tube connection nut.

Installation, user and maintenance manual – Series B15 Generators

33

Robur Spa
tecnologie avanzate
per la climatizzazione
Via Parigi 4/6
24040 Verdellino/Zingonia (Bg) Italy
T [phone] F [phone]
www.robur.it [e-mail]

Robur Mission

Revision: B Code: D-LBR595 12 MCM SDC 002 24/01/2012

Robur is dedicated to dynamic progression
in research, development and promotion
of safe, environmentally-friendly, energy-efficiency products,
through the commitment and caring
of its employees and partners.