Riello INSIEME CONDENS 26 B Manual

1
INSTALLATION AND MAINTENANCE MANUAL
CONDENSING BOILERS
26 B - 26 BK
35 B - 35 BK
26 BK
35 BK
26 B
35 B

2
MODEL CODE
INSIEME CONDENS 26 B 20039620
INSIEME CONDENS 35 B 20039590
INSIEME CONDENS 26 BK 20040647
INSIEME CONDENS 35 BK 20040447
INSIEME CONDENS rcondensing boilers conform to the following directives:
• Efficiency Directive 92/42/EEC (HHHH)
• Electromagnetic Compatibility Directive 2004/108EEC
• Low Voltage Directive 2006/95EEC
0694
CONFORMITY
RANGE

3
Dear heating engineer,
Congratulations on having chosen a rINSIEME CONDENS boiler. You have selected a mod-
ern, quality product that is designed to give dependable, efficient and safe service and to provide
comfort in the home for many years to come. This manual provides information that is essential to
the installation of the appliance. Used in conjunction with your own knowledge and expertise it will
enable you to install the appliance quickly, easily, and correctly.
Once again, please accept our thanks and our congratulations on your choice of product.
Riello S.p.A.

4CONTENTS
This manual, Code 20042465, Rev. 7(10/13), is made
up of 56 pages.
The following symbols are used in this manual:
b = Identifies actions that require caution and
adequate preparation
a = Identifies actions that you MUST NOT do
CONTENTS
GENERAL Page
General Safety Information 5
Precautions 5
Description of the appliance 6
Safety devices 6
Identification 7
Data plate 7
Layout 8
Technical specifications 10
Accessories 11
Water circuit 11
Location of sensors 12
Pumps 13
Functional wiring diagrams 14
Control panel 16
INSTALLER Page
Unpacking the product 18
Dimensions and weight 18
Handling 19
Place of installation 20
Installation in older systems and systems
requiring modernisation 20
Water in heating circuits 20
Water connections 23
Draining the condensate 26
Electrical connections 27
Fuel connections 29
Flue gas vent and comburent air intake 30
Filling and emptying the system 33
TECHNICAL ASSISTANCE SERVICE Page
Preparing for initial start-up 37
Initial start-up 37
Checks during and after initial start-up 40
Temporary shutdown 41
Preparing for extended periods of disuse 41
Maintenance 42
Oil burner
- Layout 43
- Removing the burner 43
-
Accessing the nozzle, flame guide and electrodes 44
- Setting the electrodes 44
- Oil pump 45
- Adjusting pump pressure 45
- Adjusting the air damper 45
- Removing the burner control box 46
- Burner electrical connections 46
- Functioning program 47
Disassembling and cleaning the boiler 48
Troubleshooting 51

GENERAL
5
The operation of any appliance that uses fuel, electrical power and water demands that a number of fundamental safety
precautions be respected.
b As soon as you open the packaging, check imme-
diately that the contents are all present and undam-
aged. Contact the r reseller from whom you
purchased the product if you notice any problems.
b rINSIEME CONDENS boilers must be installed
by a legally qualified heating engineer. On comple-
tion of the installation, the installer must issue the
owner with a declaration of conformity confirming
that the installation has been completed to the high-
est standards in compliance with the instructions
provided by r in this instruction manual, and that
it conforms to all applicable laws and standards.
bThe boiler must only be used for the purpose speci-
fied by r and for which it is designed. The manu-
facturer declines all responsibility, contractual or
other, for damage to property or injury to persons or
animals caused by improper installation, adjustment,
maintenance or use.
bIf you notice any water leaking from the boiler, dis-
connect it immediately from the mains electricity
supply, shut off the water supply, and notify your
local r Technical Assistance Centre or a qualified
heating engineer immediately.
bDo not clean the boiler or any of its component parts
with easily flammable substances (e.g. petrol, alco-
hol, etc.).
b Periodically check that operating pressure in the
water circuit is over 1 bar. If water pressure is con-
sistently low, contact r’s Technical Assistance
Service or a professionally qualified heating engineer.
bIf the boiler is not going to be used for an extended
period of time, proceed as follows to prepare it for
shutdown.
- Switch the appliance OFF at the control panel.
- Turn the mains power switch OFF.
- Close the boiler’s fuel cock and heating circuit water
cock.
- Drain the central heating circuit if there is any risk of
freezing.
bLow temperature (under-floor) heating systems must
be fed through a circuit fitted with a mixer valve.
bThe boiler must be serviced at least once a year.
bThis instruction manual is an integral part of the boil-
er. It must be kept safe and must ALWAYS accom-
pany the boiler, even if it is sold to another owner or
transferred to another user or to another installation.
If you damage or lose this manual, order a replace-
ment immediately from your local r Technical
Assistance Centre.
GENERAl SAFETY INFORMATION
PRECAuTIONS
a Do not allow children or infirm persons to operate the
boiler unsupervised.
a Do not operate any electrical devices or equipment,
including switches or domestic appliances, etc., if
you can smell fuel or fumes. If you detect any suspi-
cious smells:
- Ventilate the room by opening all doors and win-
dows.
- Close the fuel shut-off cock.
- Report the fault immediately to your local RIELLO
Technical Assistance Service or a professionally
qualified heating engineer.
a Do not touch the boiler when barefoot or wet.
a Never clean or service the boiler without first discon-
necting it from the mains electricity supply by turning
the main power switch and the control panel switch
OFF.
a Do not tamper with or adjust the safety or control
devices without prior authorisation and instructions
from the boiler’s manufacturer.
a Never pull, disconnect, or twist the electrical cables
coming from the boiler even if it is disconnected from
the mains electricity supply at the time.
a Do no obstruct or restrict the vents in the room where
the boiler is installed. Adequate ventilation is essen-
tial for correct combustion.
a Do not expose the boiler to the elements. It is not
designed for use outdoors.
a Do not switch the boiler off if outside temperature
drops below ZERO (risk of freezing).
a Do not store containers of flammable substances in
the room where the boiler is installed.
a Do not dispose of packaging material into the envi-
ronment, or leave it within the reach of children,
since it can become a potential hazard. Dispose of
packaging material in compliance with applicable
legislation.

GENERAL
6
INSIEME CONDENS boilers are high efficiency, oil fuelled
condensing boilers. “B” models are designed for heating
only. “BK” models come with a 120 litre vitrified storage
cylinder and are designed for combined heating and do-
mestic hot water production.
These boilers may be used as type “C” boilers if fitted
with a specific accessory kit to extend the comburent air
inlet to draw in air from outside the room where they are
installed.
The single stage jet burner is fitted with a fuel oil pre-heat-
er to ensure dependable functioning under all conditions.
The most important technical features of these boilers are:
- The combustion chamber and heat exchange system
are specially designed and shaped to achieve the best
possible volume to surface area ratio.
- The primary heat exchanger features vitrified steel
pipes and wave turbulators to recover and transfer a
large proportion of the thermal energy carried by the
combustion fumes.
- The secondary heat exchanger is made from AISI 904L
stainless steel and recovers latent heat from the flue
gases, boosting efficiency to up to 101.4 % (50°C –
30°C range).
- The horizontal vitrified storage cylinder incorporates a
vertical primary heat exchanger coil.
The exclusively designed heat exchange unit and sec-
ondary exchanger are insulated by ultra-efficient high
density glass wool. The controls and safety devices of the
electromechanical control panel conform to all applicable
technical and safety standards.
A specific accessory kit is available to control a high tem-
perature central heating circuit. Additional controllers can
also be added to manage additional direct/mixed circuits
or to integrate the boiler with r solar water heating
systems.
PRODuCT DESCRIPTION
SAFETY DEVICES
INSIEME CONDENS boilers are equipped with the following safety devices:
- A safety thermostat that forces the boiler to perform
a safety shutdown if temperature exceeds the safety
threshold (110°C).
- A flue gas thermostat in the bottom of the secondary
heat exchanger that signals an error if flue gas tempera-
ture exceeds 90°C.
- A burner safety system:The oil burner is equipped
with an electronic controller that monitors the correct
functioning of the selected program. In the event of an
error, this controller displays a burner lockout signal on
the control panel.
b The intervention of a safety device indicates a
potentially dangerous malfunction in the system,
and means that you must contact r’s Technical
Assistance Service immediately.
You may attempt to restart the boiler after a short delay
(see preparing for initial start-up).
aNever start the boiler up even for a short period if
the safety devices are not functioning correctly or
have been tampered with.
b Safety devices must only be replaced by r’s
Technical Assistance Service using original spare
parts. Refer to the spare parts catalogue supplied
with the boiler.
Always check that the boiler is functioning correctly after
any repairs.

GENERAL
7
IDENTIFICATION
rINSIEME CONDENS boilers are identified by two plates:
b If these plates or any other means of clearly identifying the product are defaced, removed or lost, proper installa-
tion and servicing may be rendered difficult.
- Data plate
This lists the appliance’s technical specifications and performance data.
- Serial number plate
This is located on the base of the boiler and speci-
fies the serial number, model, furnace power, and
maximum operating pressure.
Domestic hot water production
(BK models only)
Central heating circuit characteristics
Qn Rated heat input
Pn Rated useful heat output
IP Index of protection
Pmw Maximum operating pressure for DHW
system (BK models only)
Pms Maximum operating pressure, central
heating system
T Temperature
ηEfficiency
D Specific flow rate (BK models only)
DATA PlATE
European Directive
92/42/EEC:
Pms= bar T = °C
Qn(min)=
Pn(min)=
T067676G1
Qn(max)=
Pn(max)=
Mod.
Cod.
N°
kW
kW
kW
kW kW
D= l/minkW
kW
kW
Pmw= bar T = °C
IP
WV~Hz
RIELLO S.p.A.
Via Ing.Pilade Riello 7
37045 Legnago (VR) - ITALY
T067676G1
Mod. Cod. N°
Qn(max) kW
Pn(max) kW
bar
Pms
RIELLO S.p.A. Via Ing.Pilade Riello 7 37045 Legnago (VR) - ITALY
TIPO/TYP/TYP/TYPE/TIPO/TIPO:
COMBUSTIBILE/COMBUSTIBLE/BRENNSTOFF/BRANDSTOF/FUEL/COMBUSTIBLE/COMBUSTÍVEL:
PAESE DI DESTINAZIONE/PAYS DE DESTINATION/BESTIMMUNGSLAND/LAND VON BESTEMMING
COUNTRY OF DESTINATION/PAÍS DE DESTINO/PAÍS DE DESTINO:
European Directive
92/42/EEC:
Pms= bar T = °C
Qn(min)=
Pn(min)=
T067676G1
Qn(max)=
Pn(max)=
Mod.
Cod.
N°
kW
kW
kW
kW kW
D= l/minkW
kW
kW
Pmw= bar T = °C
IP
WV~Hz
RIELLO S.p.A.
Via Ing.Pilade Riello 7
37045 Legnago (VR) - ITALY
T067676G1
Mod. Cod. N°
Qn(max) kW
Pn(max) kW
bar
Pms
RIELLO S.p.A. Via Ing.Pilade Riello 7 37045 Legnago (VR) - ITALY
TIPO/TYP/TYP/TYPE/TIPO/TIPO:
COMBUSTIBILE/COMBUSTIBLE/BRENNSTOFF/BRANDSTOF/FUEL/COMBUSTIBLE/COMBUSTÍVEL:
PAESE DI DESTINAZIONE/PAYS DE DESTINATION/BESTIMMUNGSLAND/LAND VON BESTEMMING
COUNTRY OF DESTINATION/PAÍS DE DESTINO/PAÍS DE DESTINO:
European Directive
92/42/EEC:
Pms= bar T = °C
Qn(min)=
Pn(min)=
T067676G1
Qn(max)=
Pn(max)=
Mod.
Cod. N°
kW
kW
kW
kW kW
D= l/minkW
kW
kW
Pmw= bar T = °C
IP
WV~Hz
RIELLO S.p.A. Via Ing.Pilade Riello 7
37045 Legnago (VR) - ITALY
T067676G1
Mod.
Cod.
N°
Qn(max) kW
Pn(max) kW
bar
Pms
RIELLO S.p.A.
Via Ing.Pilade Riello 7
37045 Legnago (VR) - ITALY
TIPO/TYP/TYP/TYPE/TIPO/TIPO:
COMBUSTIBILE/COMBUSTIBLE/BRENNSTOFF/BRANDSTOF/FUEL/COMBUSTIBLE/COMBUSTÍVEL:
PAESE DI DESTINAZIONE/PAYS DE DESTINATION/BESTIMMUNGSLAND/LAND VON BESTEMMING COUNTRY OF DESTINATION/PAÍS DE DESTINO/PAÍS DE DESTINO:

GENERAL
8
14
13
18
6
1
13
10
13
7
6
12
10
11
15
1
2
1
16
12
8
9
18
3
4
5
3
4
9
8
5
6
7
15
12
3
19
17
lAYOuT
INSIEME CONDENS 26 B - 35 B
SIDE VIEW FRONT VIEW
TOP VIEW
1 - Control panel
2 - Side panel
3 - Automatic vent valve
4 - Automatic vent valve collector
5 - Boiler sensor sockets
6 - Fitting for CH circuit safety valve
7 - Fitting for CH circuit expansion vessel
8 - Flame inspection window
9 - Burner
10 - Condensate drain siphon
11 - Socket for flue gas thermostat
12 - Insulated boiler body
13 - Insulated secondary heat exchanger
14 - Flue gas vent pipe
15 - Cover panel
16 - Front panel
17 - Boiler drain cock
18 - Lifting points
19 - Flue fitting

GENERAL
9
16
15
20
23
11
24
12
6
1
15
26
25
15
7
6
14
12
13
17
1
2
3
4
9
10
11
8
5
6
7
1
18
14
8
9
20
3
4
5
10
22
21
19
17
14
3
27
INSIEME CONDENS 26 BK - 35 BK
SIDE VIEW FRONT VIEW
TOP VIEW
1 - Control panel
2 - Side panel
3 - Automatic vent valve
4 - Automatic vent valve collector
5 - Boiler sensor sockets
6 - Fitting for CH circuit safety valve
7 - Fitting for CH circuit expansion vessel
8 - Flame inspection window
9 - Burner
10 - 120 litre insulated storage cylinder
11 - Storage cylinder drain cock
12 - Condensate drain siphon
13 - Socket for flue gas thermostat
14 - Insulated boiler body
15 - Insulated secondary heat exchanger
16 - Flue gas vent pipe
17 - Cover panel
18 - Front panel
19 - Boiler drain cock
20 - Lifting points
21 - Storage cylinder temperature sensor socket
22 - Storage cylinder flange
23 - CH circuit filling cock
24 - Magnesium anode
25 - Non-return valve
26 - Storage cylinder pump
27 - Flue fitting

GENERAL
10
TECHNICAl SPECIFICATIONS
Description of storage cylinder
INSIEME CONDENS
26 BK 35 BK
Description of storage cylinder Vitrified
Cylinder layout Horizontal
Heat exchanger layout Horizontal
Maximum energy consumption 26 28 kW
DHW water temperature setting range 0-70 °C
Storage cylinder capacity 120 l
Coil water capacity 5,5 l
Heat exchanger surface area 0,85 m2
Domestic hot water production with ΔT 35°C 633 704 l/h
Water draw in 10 minutes with storage cylinder at 48°C 146 156 l
Water draw in 10 minutes with storage cylinder at 60°C 204 216 l
Specific flow rate (EN 625) 23 22 l/min.
Replenishment time (Δt 35°C) 23 20 min.
Maximum operating pressure of storage cylinder 6bar
Description INSIEME CONDENS
26 B 26 BK 35 B 35 BK
Fuel Oil
Type of boiler B23 - B23P - C13 - C33 - C63
Heat input at furnace (rated) 26,0 34,5 kW
Useful heat output (rated) 25 33,3 kW
Useful efficiency at max Pn (80-60°C) 96,1 96,5 %
Useful efficiency at 30% Pn (return temp. 47°C) 96,3 96,5 %
Useful efficiency at max Pn (50-30°C) 101,2 101,4 %
Useful efficiency at 30% Pn (return temp. 30°C) 101,5 100,8 %
Combustion efficiency 97,8 97,7 %
Losses on shutdown 370 370 W
Boiler-side pressure drop at rated heat input 20 31 mbar
Maximum residual pressure in flue gas vent (*) 15 40 Pa
Flue gas temperature (80-60°C) < 75 °C
Flue gas temperature (50-30°C) < 55 °C
Smoke scale < 0,5
Flue gas mass flow rate 0,0108 0,0143 kg/s
CO2< 12,5 %
CO < 45 ppm
NOx< 120 mg/kWh
Central heating system maximum operating pressure 3bar
Central heating system maximum operating temp. 82 °C
Safety thermostat trip temperature 110 °C
Flue gas thermostat trip temperature 90 °C
Minimum return temperature 40 °C
Boiler water temperature setting range 33-82 °C
Boiler water capacity 28 28 l
Power supply 230~50 V~Hz
Maximum energy consumption 215 305 215 305 W
Index of protection X0D IP
Condensate production at 50/30°C 1,5 1,8 l/h
(*) Values referred to atmospheric pressure at sea level.

GENERAL
11
ACCESSORIES
RI
RI
MI
1
23
4
5
7
6
8
8
EAF
RC
UAC
13
10
9
2
4
5
11
12
13
MI
7
6
INSIEME CONDENS 26 B - 35 B
INSIEME CONDENS 26 BK - 35 BK
1 - Boiler body
2 - Secondary heat exchanger
3 - Automatic vent valve
4 - Burner
5 - Boiler drain cock
6 - Drains
7 - Condensate drain siphon
8 - Flue gas vent
9 - Storage cylinder pump
10 - Non-return valve
11 - Storage cylinder drain cock
12 - CH system filling cock
13 - Storage cylinder
MI - CH flow
RI - CH return
UAC - Domestic hot water outlet
EAF - Domestic cold water inlet
RC - DHW recirculation
The following accessories are available, to be ordered separately.
ACCESSORY CODE
Direct zone accessory (model 26 B - 35 B only) 20012781
18 l expansion vessel accessory (model 26 B - 35 B only) 20041976
3 bar safety valve accessory (model 26 B - 35 B only) 20042167
Remote storage cylinder connection accessory (models 26 B - 35 B only) 20012799
120 ATRB storage cylinder connection accessory (models 26 B - 35 B only) 4047692
Storage cylinder interface kit (only for models 26 B - 35 B, with remote storage cylin-
der connection buffer tank code 20012799) 4047490
Total shutdown kit (only for models 26 B - 35 B, with storage cylinder interface kit
code 4047490) 4047318
4 l expansion vessel and 6 bar safety valve accessory (models 26 BK - 35 BK only) 4031915
Disconnector accessory (models 26 B - 35 B only) 4043017
RVS 43 temperature control accessory 20042215
80/80 flue kit for sealed room installation of INSIEME CONDENS 26 - 35 boilers 20042211
80/125 flue kit for the sealed room installation of INSIEME CONDENS 26 - 35 boilers 20042213
WATER CIRCuIT

GENERAL
12
1
2
3
4
1
2
3
4
5
6
7
88
lOCATION OF SENSORS
INSIEME CONDENS 26 B - 35 B INSIEME CONDENS 26 BK - 35 BK
INSIEME CONDENS 26 BK - 35 BK
1 - Boiler thermostat sensor
2 - Minimum temperature thermostat sensor
3 - Boiler temperature gauge sensor
4 - Safety thermostat sensor
5 - Maximum temperature thermostat sensor
6 - Storage cylinder thermostat sensor
7 -
Storage cylinder temperature gauge sensor
8 - Flue gas thermostat sensor
INSIEME CONDENS 26 B - 35 B
1 - Boiler thermostat sensor
2 - Minimum temperature thermostat sensor
3 - Boiler temperature gauge sensor
4 - Safety thermostat sensor
8 - Flue gas thermostat sensor

GENERAL
13
PERDITA DI CARICO (mbar)
PORTATA (l/h)
0
0200025003000350040004500500015001000500
50
100
150
200
250
300
350
400
450
500
600
550
26 B - BK
35 B - BK
PuMPS
a Never run the pump dry.
rINSIEME CONDENS boilers come without a pump. A pump must therefore be provided as part of the installation. In
order to choose a pump of the right size, bear in mind the boiler’s water-side pressure drop, as shown in the figure below.
FLOW RATE (l/h)
PRESSURE DROP (mbar)

GENERAL
14
L1
PE
N
T1
T2
S3
B4
BR
RE
DAI
CC
NC
S3
T2
N
NC
LV
FU
LR
2 1
C
TR
CO1 CO1A
A
4
D
1
C
3
B
2
COMG
MO1
2
1
C
TM
Brown
Yellow-green
Blue
Black
White
Red
2
3
1
4
5
6
7
8
9
10
11
12
5
1
3
87
6
2
4
K1
L1 NPETATA NPILPIPE
2 1
C
TS
TA
2
1
C
TF
L
Electrical connections to be made
by the heating engineer
NPE
230 V~50 Hz
Power supply
PI
FuNCTIONAl WIRING DIAGRAMS
INSIEME CONDENS 26 B - 35 B
COMG - 4 position function selector
TF - Flue gas thermostat (90°C) TS - Safety thermostat (110°C) TM - Minimum temperature thermostat (40°C) TR - Boiler control thermostat (33 - 82°C) K1 - Burner control relay LV - Mains power indicator LR - Burner lockout indicator FU - Mains power fuse 6.3 A-T CO1 - 12 pin connector BR - Burner connector MO1 - Terminal strip Connections to be made by the heating engineer PI - CH pump TA - Room thermostat
DAI - Automatic shut-off device (not supplied; only where required; see also the "Fuel connections"
section). The automatic shut-off device (DAI) and the relay (RE) must be suitable for a 230 VAC power supply.
RE - Relay (not supplied)

GENERAL
15
Brown
Yellow-green
Blue
Black
White
Red
Electrical connections to be made
by the heating engineer
Power supply
FU
LV LR
CO1 CO1A
CO2 CO2A
COMG COME/I
MO1
K1
BR
TA
LNPE
230 V~50 Hz PI PB
12
1 2
2 1
C
A
4
D
1
C
3
B
2
2
3
1
4 5
6
7
8
9
22
24 21
14 12
11
82°C90°C
2
3
1
4
5 6
7
8 9 10
11 12
1
2
3
4 5
6
7 8 9
10
11
12
1
2
3
4 5
6
7
8
9
4
D
3
1
B
2
2 1
C
2
1
C
5
1
3
8 7
6
2
4
2 1
C
NPBLPBPE
L1 NPETATA
NPILPIPE
2
1
C
L1
PE
N
T1
T2
S3
B4
TM TL TBTSTFTR
RE
DAI
CC
NC
S3
T2
N
NC
COMG - 4 position function selector
COME/I - Summer/Winter selector
TF - Flue gas thermostat (90°C) TS - Safety thermostat (110°C) TM -
Minimum temperature thermostat (40°C)
TR - Boiler control thermostat (33 - 82°C)
INSIEME CONDENS 26 BK - 35 BK
TL - Maximum temperature thermostat (82 - 90°C)
TB - Storage cylinder thermostat (0 - 70°C)
K1 - Burner control relay
LV - Mains power indicator
LR - Burner lockout indicator
FU - Mains power fuse 6.3 A-T
CO1 - 12 pin connector
CO2 - 9 pin connector
BR - Burner connector
MO1 - Terminal strip
PB - Storage cylinder pump
DAI - Automatic shut-off device (not supplied; only where required; see also the
"Fuel connections" section). The automatic shut-off device (DAI) and the relay (RE) must be suitable for a 230 VAC power supply.
RE - Relay (not supplied)
Connections to be made by the installer PI - CH pump
TA - Room thermostat

GENERAL
16
CONTROl PANEl
1
3
4
5
6
7
20
40
60
80
100
0120
2
1 - Function selector
IOff
II On
III On
IIII Automatic mode (only active with temperature control kit installed)
2 - Boiler temperature gauge
Displays the temperature of the central heating water.
3 - Boiler control thermostat
Allows you to set the temperature of the central heating water.
4 - Electrical power indicator
Lights to show that the system is receiving electrical power.
5 - Burner lockout indicator
Lights to show that a burner lockout has occurred.
6 - Manual reset for safety thermostat
Allows you to reset the boiler if the safety thermostat trips.
Unscrew the protective cover to access the reset button.
7 - Function indicators
8 - Manual reset for flue gas thermostat
Allows you to reset the boiler if the flue gas thermostat trips.
Unscrew the protective cover at rear of control panel to access the reset button.
INSIEME CONDENS 26 B - 35 B
8

GENERAL
17
20
40
60
80
100
0120
1
3
4
5
8
7
6
9
10
20
40
60
80
100
0120
2
1 - Function selector
IOff
II On
III On
IIII Automatic mode (only active with temperature control kit installed)
2 - Boiler temperature gauge
Displays the temperature of the central heating water.
3 - Boiler control thermostat
Allows you to set the temperature of the central heating water.
4 - Electrical power indicator
Lights to show that the system is receiving electrical power.
5 - Burner lockout indicator
Lights to show that a burner lockout has occurred.
6 - Summer (I) / Winter (II) selector
7 - Storage cylinder temperature gauge
Displays the temperature of the domestic hot water.
8 - Manual reset for safety thermostat
Allows you to reset the boiler if the safety thermostat trips.
Unscrew the protective cover to access the reset button.
9 - Storage cylinder thermostat
Allows you to set the temperature of the domestic hot water.
10 - Function indicators
11 - Manual reset for flue gas thermostat
Allows you to reset the boiler if the flue gas thermostat trips.
Unscrew the protective cover at rear of control panel to access the reset button.
INSIEME CONDENS 26 BK - 35 BK
11

INSTALLER
18
rINSIEME CONDENS boilers come in a robust
wooden cage, protected by a PVC sheet.
The following items are delivered in a plastic bag inside
the boiler:
- Installation, operation and maintenance manual
- Spare parts catalogue
- Warranty certificate
- Hydraulic test certificate
- Non-return valve
b The instruction manual is an integral part of the
boiler. Once located, read it thoroughly and keep it
safe.
P
H
L
P
H
L
DIMENSIONS AND WEIGHT
uNPACKING THE PRODuCT
Description
INSIEME CONDENS
26 B 35 B 26 BK 35 BK
L600 600 600 600 mm
P865 865 1015 1015 mm
H1025 1025 1650 1650 mm
Net weight 120 120 200 200 kg
INSIEME CONDENS
26 BK - 35 BK
INSIEME CONDENS
26 B - 35 B
INSIEME CONDENS
26 BK - 35 BK
INSIEME CONDENS
26 B - 35 B

INSTALLER
19
2
14
2
2
1
2
4
3
3
INSIEME CONDENS
26 BK - 35 BK
INSIEME CONDENS
26 B - 35 B
HANDlING
Once you have removed the packaging, proceed as follows to handle the boiler.
- Remove the front panel (1) by pulling it forwards.
- Remove the screws (2) securing the boiler to the wooden pallet.
- Make sure that the equipment used to move the boiler is adequate for the weight involved.
- Insert two 3/4" pipes (3) through the lifting points (4) inside the boiler and lift the boiler carefully off the pallet.
b Wear suitable personal protective equipment and use suitable safety devices.
aDo not leave packaging material within the reach of children, since it can become a potential hazard. Dispose of
packaging material in compliance with applicable legislation.
ROTATE
ROTATE

INSTALLER
20
a These boilers must be installed indoors. They are not
designed for outside use.
b When installing the boiler, allow sufficient space
around it to access all safety and control devices and
to permit easy maintenance.
b Make sure that the boiler’s index of electrical protec-
tion is adequate for the characteristics of the room
where it is to be installed.
rINSIEME CONDENS boilers must be installed in rooms with suitably dimensioned ventilation grilles in conformity to
applicable technical standards.
PlACE OF INSTAllATION
- Make sure that the flue is able to withstand the tem-
perature of the combustion gases and that it has been
designed and made in compliance with applicable
standards. The flue must also be as straight as pos-
sible, sealed, insulated and not blocked or choked.
- Make sure that the flue is fitted with a condensation
drainage union.
- Make sure that the electrical system has been installed
by a qualified electrician in compliance with applicable
standards.
- Make sure that flow rate, head and direction of flow of
the pumps are suitable and correct.
- Make sure that the fuel feed line and any storage tank
are made and installed in compliance with applicable
standards.
- Make sure that expansion vessels are big enough to
contain the additional volume generated by thermal ex-
pansion.
- Make sure that the central heating circuit has been
flushed out to remove all sludge and lime scale, and
that it has been bled and seal tested.
- Make sure that a suitable water treatment system is in-
stalled. (See the “Water in central heating systems” sec-
tion.) Refer to the r catalogue for details of specific
products.
b The manufacturer declines all responsibility for dam-
age caused by incorrectly constructed flue systems.
b Flue pipes for condensing boilers must be made
from special materials, different from those used for
standard non-condensing boiler flues.
When installing these boilers in old systems or systems requiring modernisation, always perform the following checks:
INTRODUCTION
Water used in central heating systems MUST be suitably
treated to ensure the correct functioning of those systems
and to guarantee an extended working life for boilers and
all other system components.
This applies not only to existing systems but to newly
installed systems too.
Sludge, limescale and other contaminants in water can
cause irreversible damage to boilers even in relatively
short times, and despite the use of top quality materials
in their manufacture.
Contact RIELLO’s Technical Assistance Service for fur-
ther information on water additives and their use.
b Always conform to the standards and legislation
applicable in the country of installation.
INSTAllATION IN OlDER SYSTEMS AND SYSTEMS REquIRING MODERNISATION
HEATING CIRCuIT WATER