Installation and
maintenance
instructions
Oil condensing boilers
Logano GB125 with
Logatop
BE burner
6 720 646 462 (03/2007)
SY/JO/LB/IL/PS/SA/AE/OM/QA/BH/YE/IR/AF/IQ/GE/AZ/AM/KW
For contractors
Read carefully prior
to
installation and
maintenance.
Contents
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
2
1 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 About these instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Correct use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Symbol key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Please observe these safety instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4.1 Installation tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4.2 Tips on the boiler room. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5 Tools, materials and auxiliary equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Specification for boilers with integral oil burners . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3.1 General operating conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.3.2 Installation room and environmental conditions . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3.3 Combustion air supply conditions (open flue operation) . . . . . . . . . . . . . . . . . . . . . 11
3.3.4 Fuel conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3.5 Mains power supply conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3.6 Conditions regarding hydraulics and water quality . . . . . . . . . . . . . . . . . . . . . . . . 12
3.4 Balanced flue operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.5 Open flue operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.5.1 Shaft cross-sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.6 Test port. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.7 Terminal openings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.8 Installation options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.9 Flue gas systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.10 Ventilation air systems (OC
43x
, OC
53x
, OC
63x
, OC
83x
) . . . . . . . . . . . . . . . . . . . 18
3.10.1Silencers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4 Standard delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 Boiler with oil burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.1 Standard delivery without flue outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1.2 Additional parts of the standard delivery for France, Spain and Portugal . . . . . . . . . . . . 19
5 Transporting the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1 Reducing the boiler weight for handling purposes . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Lifting and handling the boiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3 Transporting the boiler with transport aids . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6 Positioning the boiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.1 Wall clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.2 Reversing the burner door. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Contents
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
3
6.3 Fitting adjustable feet or a boiler plinth. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.3.1 Fitting the adjustable feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.3.2 Fitting the boiler plinth (accessory) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6.4 Positioning and levelling the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7 Installing the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.1 Making the flue connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7.2 Fit the concentric balanced flue outlet for balanced flue operation (accessory) . . . . . 27
7.3 Making the ventilation air connection for balanced flue operation (OC
53x
, OC
83x
).. . . 28
7.4 Condensate drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7.4.1 Fitting the condensate drain set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.5 Making the water connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.5.1 Fitting the return connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7.5.2 Connecting the heating flow and return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.5.3 Connecting the safety flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.5.4 Connecting the air vent valve set to the heat exchanger . . . . . . . . . . . . . . . . . . . . . 32
7.5.5 Connecting the DHW cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.5.6 Conversion of the factory-fitted extension from VS1 to VS2 . . . . . . . . . . . . . . . . . . . 33
7.5.7 Installing the boiler drain & fill valve (accessory) . . . . . . . . . . . . . . . . . . . . . . . . . 33
7.6 Filling the heating system and checking for leaks . . . . . . . . . . . . . . . . . . . . . . 34
7.7 Making the electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
7.7.1 Connecting the mains power supply and other components . . . . . . . . . . . . . . . . . . . 36
8 Commissioning the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.1 Creating operating pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
8.2 Checking the location of the hot gas baffle plates . . . . . . . . . . . . . . . . . . . . . . . 39
8.3 Preparing the heating system for operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8.4 Switching on the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8.5 Starting the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.6 Installing the burner cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.7 Setting the programming unit/control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.8 Commissioning report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
9 Operating the Logamatic BC10 base controller . . . . . . . . . . . . . . . . . . . . 43
9.1 Controls on the BC10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
9.2 Switching on and off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.2.1 Switching on the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.2.2 Shutting down the heating system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
9.3 Maximum boiler temperature for heating mode . . . . . . . . . . . . . . . . . . . . . . . . 44
9.4 Set DHW temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.5 Status display and fault diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
9.6 Resetting the service interval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.7 Burner functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.7.1 Resetting all interlocks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.7.2 "Burner on" LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.8 Carrying out a flue gas test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Contents
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
4
9.9 Selecting manual mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.10 Adjusting parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9.10.1Limiting the heating load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9.10.2Pump run-on time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
9.10.3DHW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
10 Shutting down the heating system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
10.1 Normal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
10.2 In an emergency. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
11 Heating system inspection and maintenance . . . . . . . . . . . . . . . . . . . . . 51
11.1 Why is regular maintenance important? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
11.2 Preparing the boiler for cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
11.3 Cleaning the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
11.3.1Cleaning the boiler with cleaning brushes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
11.3.2Wet cleaning (chemical cleaning) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
11.4 Cleaning the heat exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
11.5 Cleaning the neutralising system and siphon . . . . . . . . . . . . . . . . . . . . . . . . . 56
11.6 Checking the heating system operating pressure. . . . . . . . . . . . . . . . . . . . . . . 57
11.7 Concentric combustion air supply and flue gas pipe . . . . . . . . . . . . . . . . . . . . . 57
11.8 Ventilation air system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
11.9 Inspection and maintenance reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
12 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
12.1 Identifying and clearing faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
13 Sensor curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
14 Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Safety
1
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
5
1 Safety
1.1 About these instructions
These instructions contain important information regar-
ding the safe and proper installation, commissioning and
maintenance of the boiler.
In the following, the special oil boiler Logano GB125 with
Logatop
BE burner will generally be referred to as the
boiler.
These installation and maintenance instructions are de-
signed for contractors who, due to their training and experi-
ence, are knowledgeable in the handling of heating systems
and oil/gas installations.
1.2 Correct use
The boiler must only be used to heat heating water and
for DHW heating, e.g. for detached houses or apartment
buildings.
If the boiler is used for balanced flue operation, it must
only be operated with the air ventilation systems given
as accessories by Buderus
(Æ Tab. 18 page 18).
Observe the details on the type plate and the specifica-
tions (Æ Chapter 3, page 8) to ensure correct use of this
appliance.
1.3 Symbol key
In these instructions, the following symbols are used:
Æ Cross references
Cross references to a specific point in the document or
to other documents are marked with an arrow
Æ .
1.4 Please observe these safety
instructions
Observe all local regulations and standards during in-
stallation and operation:
• Local building regulations regarding installation,
combustion air supply, flue gas systems and connec
-
tion to a chimney.
• Latest edition of the IEE Wiring Regulations gover-
ning electrical connection to the mains power supply.
• Regulations and standards regarding the safety
equipment of heating systems.
RISK TO LIFE
Identifies possible risks that may result in
serious injury or death if appropriate care is
not taken.
RISK OF INJURY/
SYSTEM DAMAGE
Identifies potentially dangerous situations,
which might lead to medium or slight inju
-
ries or to material losses.
USER INFORMATION
User tips for the optimum utilisation and
adjustment of the appliance plus other
useful information.
USER INFORMATION
Only use original Buderus components.
Buderus cannot accept liability for losses
resulting from the use of spare parts not
supplied by Buderus.
RISK TO LIFE
due to neglecting your own safety in emer-
gencies, such as in case of a fire.
B Never risk your own life. Your own safe-
ty is paramount.
Safety
1
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
6
1.4.1 Installation tips
1.4.2 Tips on the boiler room
1.5 Tools, materials and auxiliary
equipment
The installation and maintenance of this boiler requires
standard tools used for building heating systems and for
oil and water installations.
The following items are also of use:
• Trolley with strap or Buderus boiler trolley
• Cleaning brushes and/or chemical cleaning agent for
wet cleaning
1.6 Disposal
B Dispose of packaging in an environmentally respon-
sible manner.
B Dispose of all heating system components which
must be replaced via an authorised disposal site.
RISK TO LIFE
from electricity.
B Only suitably qualified electricians are
permitted to carry out electrical work.
B Before opening an appliance: Isolate it
across all poles from the mains power
supply and safeguard it against unin
-
tentional reconnection.
B Observe all installation instructions.
RISK TO LIFE
through poisoning.
An inadequate supply of air can result in
the escape of dangerous flue gas when
using the appliance in open flue mode.
B Ensure that ventilation or extract air
apertures are not reduced or closed.
B The boiler must not be operated until
the obstruction has been removed.
B Inform the system user in writing of the
problem and the associated risk.
RISK OF FIRE
through flammable materials or liquids.
B Ensure that there are no flammable ma-
terials or liquids in the immediate vicini-
ty of the boiler.
RISK TO LIFE
through toxic flue gases.
B Ensure that, when operating the appli-
ance in open flue mode, no mechanical
air extractors, such as cooker hoods,
driers or ventilation appliances, are able
to extract combustion air from the in
-
stallation location.
RISK TO LIFE
through toxic flue gases.
B Only operate these boilers with a chim-
ney or flue system that provides the re-
quired draught during operation.
Product description
2
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
7
2 Product description
The boiler is a condensing boiler with oil combustion and
modulating boiler water temperature control that can
operate in open or balanced flue mode. The respective
flue system determines the mode of operation.
The boiler comprises:
• Control unit
• Boiler casing
• Boiler block with thermal insulation
• Boiler door
• Burner
• Heat exchanger system
The control unit monitors and controls all electrical boiler
components.
The boiler shell prevents energy losses and acts as a si-
lencer.
The boiler block transfers the heat generated by the bur-
ner to the heating water. The insulation prevents energy
losses.
Fig. 1 Front view Logano GB125
1 Control unit
2 Boiler casing
3 Boiler door
4 Oil burner
5 Burner cover
6 Heat exchanger system
1
2
3
4
5
6
Fig. 2 Back view Logano GB125
(shown excluding thermal insulation)
1 Heat exchanger system
1
Specification
3
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
8
3 Specification
3.1 Specification for boilers with integral oil burners
Fig. 3 Connections and dimensions (dim. in mm)
Connections (for dimensions see the following tables):
VK = Boiler flow VS = DHW cylinder flow
RK = Boiler return RS = DHW cylinder return
EL = Drain (connection for boiler drain & fill valve or expan-
sion vessel)
VSL = Safety line flow (connection for an on-site safety val-
ve, pressure gauge or air vent valve)
Boiler size 18 22 30 35
Rated output (factory setting) (55/30 °C) kW 18.5 22.6 30.3 36.6
Rated output (factory setting) (80/60 °C) kW 17.7 21.8 29.0 35.1
Combustion output kW 18.2 22.4 29.9 36.3
Boiler water content I 35.6 35.6 44.9 44.9
Gas content I 42.9 57.9
Flue gas temperature
1
(balanced flue) (55/30 °C) °C 49 58 58 66
Flue gas temperature
1
(balanced flue) (80/60 °C) °C 72 80 80 89
Flue gas mass flow rate kg/s 0.0072 0.0089 0.0119 0.0144
CO
2
content % 13.5 – 14.0
Required draught Pa 0
Available draught Pa 30 50
Pressure drop on the hot gas side (80/60 °C) mbar 0.14 0.2 0.23 0.35
Pressure drop on the water side (dT = 10 K) mbar 36 54 60 81
Permissible flow temperature
2
°C 100
Tab. 1 Specification for boilers with integral oil burners
1
Flue gas temperature according to EN 303.
2
Safety limit (high limit safety cut-out, STB)
Maximum possible flow temperature = Safety limit (STB) – 18 K
Example: Safety limit (STB) = 100 °C, maximum possible flow temperature = 100 – 18 = 82 °C
The safety limit must meet the relevant national regulations.
Specification
3
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
9
Boiler size 18 22 30 35
Permissible operating pressure bar 3
Maximum time constant on thermostat s < 1
Maximum time constant of temperature monitor
and high limit safety cut-out (STB)
s < 1.2
Current rating 230 VAC, 50 Hz, 10 A IP 40
Tab. 2 Specification for boilers with integral oil burners
Boiler size 18 22 30 35
Overall boiler length (L) mm 955 955 1075 1075
Length of boiler block (L
K)
mm 656 656 776 776
Combustion chamber length (L
F)
mm 407 407 522 522
Combustion chamber diameter mm 270
Burner door depth mm 60
Section feet clearance (F
L
) mm 410 410 530 530
Net weight
1
kg 192 192 228 228
Tab. 3 Dimensions, weight and other details for boilers with integral oil burner
1
Weight incl. packaging approx. 6 – 8 % heavier.
Country: Germany
Fuel types Fuel oil type EL to DIN 51 603
Comments The boiler may only be operated with the specified fuel.
Country: Austria
Fuels Fuel oil EL
Comments The boiler can only be operated with the specified fuels.
The requirements acc. to Art. 15 a B-VG regarding emissions and efficiency are being met.
Country: Switzerland
Fuel types Fuel oil EL
Comments The boiler may only be operated with the specified fuel.
The output figures shown in the Tab. "Specifications" are nominal output figures.
In practical operation, some values are not reached to ensure the LVR regulations are met within the specified
output range.
Tab. 4 Fuels
All countries
Fuels Fuel oil EL
(Viscosity max. 6.0 mm
2
/s at 20 °C)
Comments The boiler may only be operated with the specified fuel.
Carry out maintenance and cleaning procedures annually. For this, check the entire system is functioning per-
fectly. Immediately rectify any faults discovered.
Tab. 5 Country-specific fuels and comments
Specification
3
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
10
3.2 Declaration of Conformity
3.3 Operating conditions
By observing these operating conditions, this boiler will
last for a long time. Some details refer to operation with
Buderus control units only.
3.3.1 General operating conditions
The design and operation of this product
conforms to European Directives and the
supplementary national requirements. Its
conformity is confirmed by the CE marking.
You can view the Declaration of Conformity
on the internet at www.buderus.de/konfo or
request a copy from your local Buderus of
-
fice.
SYSTEM DAMAGE
Deviations from the stated operating con-
ditions may lead to faults. Severe deviati-
ons may lead to the damage of individual
components or of the boiler.
B Observe the details on the boiler type
plate, which are binding and which
must always be observed.
Operating Conditions
Minimum boiler water tem-
perature
Interruption of operation
(complete boiler shutdown)
Controlling heating circuits
with mixer
1
Minimum return temperature
In conjunction with control units for modulating boiler water temperatures
No requirement
The Logamatic control unit
safeguards the operating
temperature
Automatic
through the Logamatic
control unit
No requirement
However, preferred for low tem-
perature heating systems, such
as for heating system design
55/45
°C
Required for:
– Underfloor heating systems
– Systems with a large water
content >15 l/kW
No requirement
Tab. 6 General operating conditions
1
A control unit for heating circuits with mixers improves control characteristics and is particularly recommended for systems with multiple heating
circuits.
Specification
3
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
11
3.3.2 Installation room and environmental conditions
Operating Conditions Notes – detailed requirements
Temperature in the boiler room +5 to +40 °C
Relative humidity Max. 90 % No condensation or dripping damp inside the boiler room
Dust/airborne seeds – Excessive dust must be prevented inside the boiler room when the boiler is
operating, e.g.:
– Building dust through very dusty building work
The supply of combustion air must not contain excessive amounts of dust
or airborne seeds; if necessary, entry should be prevented with air filters,
e.g.:
– Air supply loaded with dust from dirt roads and paths.
– Air supply loaded with dust from production and processing facilities, e.g.
quarries, mines, etc.
– Airborne seeds from composite plants.
Halogenated hydrocarbon
compounds
– The combustion air must be free from halogenated hydrocarbon com-
pounds.
– Identify the source of halogenated hydrocarbon compounds and eliminate
their ingress. Where this is impossible, route combustion air from areas which
are not contaminated by halogenated hydrocarbon compounds.
Observe the following:
– Buderus catalogue - Heating Technology Germany
– Worksheet K 3 in the Buderus catalogue
Fans which extract air from the
boiler room.
– During burner operation, no mechanical air handling equipment may be operated
which could extract combustion air from the boiler room, e.g.:
– Cooker hood
–Dryer
– Ventilation equipment
Small animals – Prevent small animals from entering the boiler room, particularly through the ven-
tilation air apertures, by fitting the vents with grilles.
Fire safety – Maintain clearances between the boiler and flammable materials in accordance
with local regulations. Generally, maintain a minimum clearance of 40 cm. Never
store flammable materials or liquids in the vicinity of the boiler.
Flooding – If there is a serious risk of flooding, disconnect the boiler in good time from its fuel
and power supply before water enters the room. Any general and burner compo-
nents or control equipment, which come into contact with water, must be replaced
before re-commissioning.
Tab. 7 Boiler room and environment
3.3.3 Combustion air supply conditions (open flue operation)
Operating Conditions Boiler output (for
multi-boiler systems = total output)
Ventilation air cross-section in cm
2
(unrestricted aperture)
Ventilation air cross-section for
combustion air from outside for
open flue operation (split over
no more than 2
vents)
< 50 kW min. 150 cm
2
> 50 kW min. 150 cm
2
plus 2 cm
2
for each kW
in excess of 50 kW
Tab. 8 Observe country-specific requirements for open flue operation.
For balanced flue operation Æ Chapter 3.8, page 15
Specification
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Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
12
3.3.4 Fuel conditions
3.3.5 Mains power supply conditions
Operating Conditions Notes – detailed requirements
Permissible fuels for boilers
with Logatop oil burner
– Boilers with integral oil burner must only be operated with fuel oil. The kinematic
viscosity of the oil must not exceed 6 mm
2
/s (at 20 °C). This is equivalent to a
Redwood I viscosity of 41.0 s (UK) or Sayboldt viscosity of 45.5 s (USA).
Reduce the maintenance/cleaning interval accordingly if fuel oil of poor quality is
used.
Contamination – Technically free of contaminants (such as, for example, dust, water vapour, li-
quids), i.e. the constant operation will not result in deposits that may lead to a re-
striction of cross-section in valves, sieves and filters.
Tab. 9Fuels
Operating Conditions Notes – detailed requirements
Power supply voltage 195 – 253 V Observe the voltage range of the burner and control unit used. The outer
casing/boiler must be earthed for safety reasons and to function correctly.
Fuse 10 A
Frequency 47.5 – 52.5 Hz Sine wave
IP rating IP40 (protected against ingress of foreign bodies > 1 mm dia.; no protection against
water ingress)
Tab. 10 Mains power supply
3.3.6 Conditions regarding hydraulics and water quality
Operating Conditions Notes – detailed requirements
Operating pressure 0.5 – 3.0 bar
Permissible test pressure 1.0 – 3.9 bar
Protection against excess tem-
peratures via TR thermostat
50 – 90 °C
Protection against excess tem-
peratures via high limit safety
cut-out STB
100 °C
Water quality – Only use drinking water to fill and top up the boiler. We recommend a pH value
of 8.2 – 9.5 (observe VDI 2035).
Tab. 11 Hydraulics and water quality
Specification
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Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
13
3.4 Balanced flue operation
The boiler meets the requirements specified by the ap-
probation principles of the DIBT for balanced flue oil
combustion equipment to EN 15034/15035
(
Æ Chapter 3.2, page 10 "Declaration of Conformity").
The entire system (ventilation air pipe - burner/boiler -
flue gas pipe) corresponds to the types of oil combustion
equipment shown in the table on the right. The additional
designation "x" declares that the combustion equipment
meets the sealing demands and can therefore be opera
-
ted independently of the equipment and ventilation in the
boiler room.
Observe the country-specific standards and regulations
concerning the operation of balanced flue oil combustion
equipment.
Please ensure that, when connecting the appliance to a
balanced flue system that has not been tested with the
boiler (OC
63x
), the country-specific requirements (parti-
cularly concerning the design of the terminal) and the
specifications of the general building regulations apper
-
taining to the system are observed.
For the technical details regarding the sizing of the ba-
lanced flue system for OC
63x
, see the adjacent Tab. 13.
Installation
type
Routing combustion air and
flue gas
OC
13x
Concentric combustion air supply and flue gas routing horizontal through the outside wall. The terminals are loca-
ted close beside each other in the same pressure area. Combustion air supply and flue gas routing are part of the
combustion equipment.
OC
33x
Concentric combustion air supply and flue gas routing vertical via roof. The terminals are located close beside
each other in the same pressure area. Combustion air supply and flue gas routing are part of the combustion
equipment.
OC
43x
Connection to air-flue gas system (LAS, simply laid); ventilation air pipe from air shaft and connecting piece for
chimney are part of the combustion equipment.
OC
53x
Separate combustion air supply and flue gas routing (tested together with the boiler). The terminals are located in
different pressure areas. Ventilation air and flue gas pipes are part of the combustion equipment.
Please note: When routing the flue gas horizontally, then the terminals must not be on opposite walls of the buil-
ding.
OC
63x
Designed for the connection to a combustion air supply and flue gas routing system, not tested with the boiler.
OC
83x
Connection to a flue gas system (underpressure operation). Ventilation air pipe and connecting piece to the chim-
ney are part of the combustion equipment.
Tab. 12 Balanced flue installation types
GB125
Residual head Pa 30/50
Max. permiss. inlet pressure
drop on the air inlet
connector
Pa 200
Tab. 13 Design details for OC
63x
Specification
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Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
14
3.5 Open flue operation
(Installation type B23, B23P, GA or B33, GAX)
For the ventilation of the boiler room, a ventilation aper-
ture to the outside offering a minimum cross-section of
150 cm
2
must be provided, or there must be an intercon-
nection with other rooms from where combustion air can
be freely drawn.
To minimise the noise development with open flue ope-
ration, pull the ventilation air hose from the burner.
B Install the volume flow terminal in accordance with
the installation instructions for the flue gas system.
3.5.1 Shaft cross-sections
3.6 Test port
Flue gas testing and the determination of the combusti-
on air temperature are restricted to the test ports.
Observe the information in the Logatop BE - RLU oil
burner instructions.
3.7 Terminal openings
If the ventilation air and flue gas system terminals are
beside each other, you must take measures to prevent
flue gases being drawn in again. You must keep to the
requirements of DIN 18160-1 (in particular those relating
to terminal design), as well as the requirements relating
to general building regulations approval for that system.
In addition, rainwater must not get into the ventilation air
pipe.
Please speak to your local flue gas inspector should you
have any questions regarding the design of the terminal
openings.
Fig. 4 Shaft cross-sections
DN Fem.
connection
A B
80 95 130 120
110 128 188 168
Tab. 14 Dimensions for Fig. 4 shaft cross-sections
(dim. in mm)
Fig. 5 Fitting balanced flue outlet
1 Ventilation air test port
2 Flue gas test port
Fig. 6 Samples of terminal designs
(dim. in mm)
1 Flue gas
2 Ventilation air
1
2
12 12
0.4
USER INFORMATION
Badly designed terminal openings can
lead to unsafe combustion and burner
faults.
Specification
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Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
15
3.8 Installation options
According to the permitted installation types, the options
shown in the following table for open and balanced flue
boiler installation are available.
Installation type Description
B
23
GA
Flue gas routed through
a flue inside a shaft with
secondary ventilation.
B
23P
Tight against positive
pressure
System like B
23
with requirement for tightness against positive
pressure
B
33
GAX
In conjunction with GAK
open flue concentric air
and flue gas routing.
OC
13x
Concentric ventilation air
and flue gas pipe hori
-
zontal through the out-
side wall. Terminals
close beside each other
in the same pressure
area
Concentric combustion air and flue gas systems acc. to
Æ Tab. 16, page 17.
OC
33x
Concentric ventilation air
and flue gas routing ver
-
tical via roof. Terminals
close beside each other
in the same pressure
area.
Concentric combustion air and flue gas systems acc. to
Æ Tab. 16, page 17.
Tab. 15 Installation options
Positive
Specification
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Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
16
OC
43x
Ventilation air and flue
gas routing via simply
laid LAS in separate
shafts.
Flue gas outlet and ven-
tilation air inlet in the
same pressure area.
Pipes to the end of the chimney present on-site:
– Flue gas pipe according to Æ Chapter 3.9, page 17.
– Ventilation air pipe in separate shaft according to
Æ Chapter 3.10, page 18.
– Terminal openings according to Æ 3.7, page 14.
A LAS chimney (underpressure operation, moisture-resistant)
is available on-site:
– Flue gas connecting piece for chimney according to
Æ Chapter 3.9, page 17.
– Ventilation air pipe in separate shaft according to
Æ Chapter 3.10, page 18.
– Terminal openings according to Æ Chapter 3.7, page 14.
A LAS chimney with country-specific approval, approved ter-
minal design and ceramic inner tube is available on-site:
– Flue gas connecting piece for LAS according to
Æ Chapter 3.9, page 17.
– Ventilation air connecting piece for LAS according to
Æ Chapter 3.10, page 18.
– Terminal openings according to Æ Chapter 3.7, page 14.
OC
53x
Flue outlet and ventilati-
on air inlet in areas with
different pressure.
The flue gas pipe is laid in a shaft available on-site or even out-
side:
– Flue gas pipe according to Æ Chapter 3.9.
– Ventilation air pipe according to Æ Chapter 3.10, page 18.
OC
63x
Flue outlet and ventilati-
on air inlet in areas with
different pressure.
A flue gas pipe is available on site (tight against positive pres-
sure and moisture resistant).
– Flue gas connecting piece according to Æ Chapter 3.9.
– Ventilation air pipe according to Æ Chapter 3.10, page 18.
OC
83x
Flue outlet and ventilati-
on air inlet in areas with
different pressure.
A chimney (underpressure operation, moisture-resistant) is
available on-site:
– Flue gas connecting piece according to Æ Chapter 3.9.
– Ventilation air pipe according to Æ Chapter 3.10, page 18.
Installation type Description
Tab. 15 Installation options
Negative
pressure
Positive pressureNegative pressure
Specification
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Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
17
3.9 Flue gas systems
The condensing boiler must only be combined with ap-
proved flue systems (Æ Tab. 16) that meet the following
requirements:
• country-specific approval
• suitable for fuel oil EL
• suitable for at least 120 °C flue gas temperature
• moisture-resistant
• tight against positive pressure
For the maximum flue length, see our catalogue or cal-
culate in accordance with EN 13384. The available
draught can be found in the specification
(Æ Chapter 3,
page 8).
You must provide a function test certificate in accor-
dance with the standards and guidelines applicable in
your country.
For installation types OC
33x
and OC
53x
, Buderus offers
the balanced flue systems listed at
Æ Tab. 16 (LAS sys-
tems). The maximum lengths listed in Æ Tab. 17 can be
achieved with the basic modules and the relevant exten-
sion components.
Should different details apply to your chosen system,
provide a function verification for your balanced flue sys
-
tem in accordance with the country-specific standards
and directives.
Approved types
of installation
Approved
flue gas systems
OC
13x
, OC
33x
Ubbink ROLUX FIOUL
Poujoulat Dualis FIOUL
Centrotherm DO-S
Centrotherm GA-K
OC
33x
InterActive DO-S
InterActive GA-K
OC
43x
InterActive LAS-K
OC
43x
, OC
53x
, OC
63x
, OC
83x
Buderus Logafix DD
Raab BW/DW
SUR KS-RESOPLAN Type C
Centrotherm GAF-K
OC
53x
Interactive GAF-K
Centrotherm GAF-K
Ubbink ROLUX FIOUL
Poujoulat Dualis FIOUL
Tab. 16 Approved types of installation and flue gas systems
Specification
3
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
18
3.10 Ventilation air systems (OC
43x
, OC
53x
, OC
63x
, OC
83x
)
Only Buderus ventilation air systems listed in the table
on the right are approved (including a combination of
both systems).
The permissible length of the ventilation air system for
the plastic DN60 system is reduced by
•1.0 m per 45° bend
•1.5 m per 90° bend
•4 m per 1 m air hose (in combinations)
•15 m when using a silencer
The maximum available negative pressure at the boiler
inlet hose is 200
Pa.
3.10.1 Silencers
If the ventilation air is drawn in via an outer wall connec-
tion, then the use of a silencer is strongly recommended.
If the ventilation air is drawn in via the roof, the silencer
may be dispensed with.
Balanced flue operation - maximum flue length (m)
flue system, plastic DN 80/125
Boiler size
OC
13
OC
33x
OC
53x
OC
43x
GA-K and
DO/DO-S
GAF-K Combustion air pipe via outer
wall, LAS ventilation shaft
Variant 1 Variant 2 Variant 1 Variant 2
according to
EN 13 364-1
GB125 18 5.0 11.5 11.5 21.5 20.1
22 5.0 15.5 15.5 25.0 24.9
30 5.0 19.5 18.0 20.5 18.0
35 5.0 21.5 20.0 22.4 20.1
Open flue operation - maximum flue length (m)
flue system, plastic DN 80/125
Boiler size
B
23x
GA GN
Variant 1 Variant 2
according to
EN 13 384-1
GB125 18 25.0 25.0
22 25.0 25.0
30 19.5 18.0
35 21.5 20.0
Tab. 17 Maximum flue length
Variant 1: Chimney entry: 1 bend, connection piece L=1.5 m
Variant 2: Chimney entry: 1 bend, connection piece L=1.5 m, 1 90° bend, 1 tee
Maximum length from
boiler rear panel
m
Air hose Santo SL DN 63
Flexible air hose, 4 m long, incl. hose
connector
1
and 2 special hose clips
8
2
Plastic plug-in system DN60
Straight pieces 250, 250
1
, 500,
1000, 1500, 2000
mm long, 45° and
90° bends plus silencers1 are avai
-
lable
35
Tab. 18 Approved ventilation air systems
(Buderus accessory)
1
with test port
2
incl. silencer max. 4 m
Standard delivery
4
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
19
4 Standard delivery
B After delivery, check all packaging is in perfect
condition.
B Check all components have been delivered.
4.1 Boiler with oil burner
4.1.1 Standard delivery without flue outlet
1
Components on pallet.
2
Component underneath the burner cover.
Buderus supplies the boiler support as an accessory.
Component Pce Packaging
Boiler block 1 1 pallet
Boiler casing, fitted to the boiler
block at the factory
Burner cover, fitted to the boiler
block at the factory
Heat exchanger system
Oil burner fitted to the burner
door at the factory
Control unit
Cover panel
Adjustable feet
1
4 1 x foil
packaging
Return connector
1
1
Siphon
2
1 1 x foil
packaging
Technical documentation 1 x foil
packaging
Tab. 19 Standard delivery
4.1.2 Additional parts of the standard delivery for France, Spain and Portugal
Component Pce Packaging
Concentric flue outlet 1 1 x foil
packaging
Tab. 20 Additional parts of the standard delivery
Transporting the boiler
5
Logano GB125 oil condensing boiler - Technical specifications are subject to change without prior notice.
20
5 Transporting the boiler
This chapter details how to safely transport the boiler.
5.1 Reducing the boiler weight for handling purposes
If required, you can reduce the weight of the boiler by re-
moving the burner cover and door.
B Remove the burner cover screws.
B Slightly lift the burner cover and remove forward.
B Remove mains plug, communication and sensor ca-
ble from SAFe. In balanced flue operation, detach
combustion air hose as well (
Æ burner documentati-
on).
SYSTEM DAMAGE
through impact.
B Please observe the handling refe-
rences on the packaging to protect
components susceptible to impact da
-
mage.
USER INFORMATION
B Protect connectors against contamina-
tion if the boiler is not immediately ta-
ken into use.
USER INFORMATION
Dispose of packaging in an environmental-
ly responsible manner.
RISK OF INJURY
from being inadequately secured during
transport.
B Use only suitable means of transportati-
on, e.g. sack trolley with strap, stair trol-
ley or step trolley.
B Secure the load against falling.
Fig. 7 Removing the burner cover
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