Buderus Logano plus SB325 Installation And Service Instructions Manual

Buderus
Brand
Buderus
Model
Logano plus SB325
Category
Kitchen & houseware accessories
Type
Installation And Service Instructions Manual
Read carefully before carrying out installation and maintenance.
Installation and service instructions for contractors
Floor standing
condensing boiler
Logano plus SB325
6 720 804 354-00.1ITL
6 720 806 328 (2013/07) GB
Table of contents
Logano plus SB325 – 6 720 806 328 (2013/07)
2
Table of contents
1 General safety instructions and explanation of symbols . . . . 3
1.1 Key to symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Safety regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 About the appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Type overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Determined use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Safety equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4 EU Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . 5
2.5 Scope of supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.6 Required accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.7 Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.8 Suitable fuels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.9 Data plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.10 Tools, materials and auxiliary equipment . . . . . . . . . . . . 6
2.11 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.12 Specifications, dimensions, connections . . . . . . . . . . . . 8
2.12.1 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.12.2 Unit data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.12.3 Values for calculating the flue gas . . . . . . . . . . . . . . . . 10
3 Information on installation and operation . . . . . . . . . . . . . . . 11
3.1 Standards, regulations and directives . . . . . . . . . . . . . 11
3.2 Notes on low water level limiter (LWI) . . . . . . . . . . . . . 11
3.3 Tightness test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Duty to obtain a permit and provide notification . . . . . 11
3.5 Burner selection and settings . . . . . . . . . . . . . . . . . . . . 11
3.6 Installation requirements . . . . . . . . . . . . . . . . . . . . . . . 11
3.7 Ventilation requirements . . . . . . . . . . . . . . . . . . . . . . . 11
3.7.1 Open flue boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.7.2 Room sealed boilers . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.8 Combustion air quality . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.9 Heating water quality . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.10 Using antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.11 Electrical installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.12 Control unit settings . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.13 Hydraulic connection to the heating system . . . . . . . . 14
3.14 Setting the minimum and maximum pressure limiters 14
3.15 Pressure maintenance . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 Transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Securing the load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.2 Moving the boiler with a crane, forklift truck or two
pallet trucks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.2.1 Lifting the boiler with a crane . . . . . . . . . . . . . . . . . . . . 15
4.2.2 Moving the boiler with a forklift truck . . . . . . . . . . . . . . 16
4.2.3 Moving the boiler with two pallet trucks . . . . . . . . . . . 16
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 Siting the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.2 Levelling the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.3 Fitting the thermal insulation . . . . . . . . . . . . . . . . . . . . 18
5.4 Flue gas and water connections for heating system . . 19
5.4.1 General requirements of the flue system . . . . . . . . . . . 19
5.4.2 Connecting the flue gas system . . . . . . . . . . . . . . . . . . 19
5.4.3 Fitting a sealing collar (accessory) . . . . . . . . . . . . . . . . 19
5.4.4 Connecting the boiler to the pipework . . . . . . . . . . . . 19
5.5 Installing the condensate hose and neutralising
system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.6 Installing the minimum pressure switch and minimum
pressure limiter (accessories) . . . . . . . . . . . . . . . . . . . . 21
5.7 Installing the low water level limiter (accessory) . . . . 21
5.8 Filling the boiler and checking connections for leaks . 21
5.9 Fitting the casing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.9.1 Fitting the connection plates . . . . . . . . . . . . . . . . . . . . 21
5.9.2 Fitting the side panels . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.9.3 Routing the burner cable . . . . . . . . . . . . . . . . . . . . . . . 22
5.9.4 Fitting the back plate . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.9.5 Fitting the boiler cover . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.9.6 Fitting the front panel . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.10 Opening and reversing the combustion chamber door 24
5.10.1 Opening and closing the combustion chamber door . 24
5.10.2 Refitting the door hinges . . . . . . . . . . . . . . . . . . . . . . . 24
5.11 Fitting the burner (accessory) . . . . . . . . . . . . . . . . . . . 24
5.11.1 Fitting the burner to the combustion chamber door . . 25
5.12 Securing the cover, additional type plate and
data plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.13 Fitting temperature sensors . . . . . . . . . . . . . . . . . . . . . 26
5.14 Fitting and electrically connecting the control unit
(accessory) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6.1 Flushing the heating system . . . . . . . . . . . . . . . . . . . . . 28
6.2 Filling the heating system . . . . . . . . . . . . . . . . . . . . . . . 29
6.3 Preparing the heating system for operation . . . . . . . . 29
6.4 Commissioning the control unit and burner . . . . . . . . 29
6.5 Setting control unit parameters . . . . . . . . . . . . . . . . . . 29
6.6 Commissioning report . . . . . . . . . . . . . . . . . . . . . . . . . 30
7 De-commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7.1 Shutting down the heating system . . . . . . . . . . . . . . . . 31
7.2 Shutting down the heating system in an emergency . . 31
8 Inspection and service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.1 General notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.2 Preparing the boiler for inspection and maintenance . 31
8.3 Cleaning the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.3.1 Preparing the boiler for cleaning with brushes . . . . . . 32
8.3.2 Cleaning the boiler with cleaning brushes . . . . . . . . . . 32
8.3.3 Cleaning the flue gas collector . . . . . . . . . . . . . . . . . . . 32
8.3.4 Replacing the gasket in the flue gas collector and the
reversing chamber door . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.3.5 Fitting the cleaning cover on the flue gas collector
and reversing chamber door . . . . . . . . . . . . . . . . . . . . . 33
8.3.6 Wet-cleaning the boiler . . . . . . . . . . . . . . . . . . . . . . . . . 33
8.4 Checking and correcting the water pressure . . . . . . . . 34
8.4.1 When should you check the water pressure
in the heating system? . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.4.2 Sealed unvented systems . . . . . . . . . . . . . . . . . . . . . . . 34
8.4.3 Installations with automatic pressurisation systems . 34
8.5 Inspection and service reports . . . . . . . . . . . . . . . . . . . 35
1 General safety instructions and explanation of symbols
Logano plus SB325 – 6 720 806 328 (2013/07)
3
9 Correcting a burner fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
10 Environmental protection/disposal . . . . . . . . . . . . . . . . . . . . 37
11 System examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
11.1 Layout of the minimum equipment for technical safety
in accordance with EN 12828:2003; operating
temperature < 105 °C; cut-out temperature
(high limit safety cut-out) < 110 °C . . . . . . . . . . . . . . . .38
11.2 Safety equipment in accordance with the EC type
inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
11.3 Requirements for alternative items of safety
equipment and other pieces of equipment . . . . . . . . . .39
11.3.1 Safety valve requirements . . . . . . . . . . . . . . . . . . . . . . 39
11.3.2 High limit safety cut-out requirements . . . . . . . . . . . . . 39
11.3.3 Maximum pressure limiter requirements . . . . . . . . . . . 39
11.3.4 Minimum pressure switch as low water level limiter
requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
11.3.5 Minimum pressure limiter as low water level limiter
requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
11.3.6 Water level limiter as low water indicator
requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
11.3.7 Burner requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
11.3.8 Boiler controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
1 General safety instructions and explanation
of symbols
1.1 Key to symbols
Warnings
The following keywords are defined and can be used in this document:
• NOTICE indicates a situation that could result in damage to property
or equipment.
• CAUTION indicates a situation that could result in minor to medium
injury.
• WARNING indicates a situation that could result in severe injury or
death.
• DANGER indicates a situation that will result in severe injury or death.
Important information
Additional symbols
Warnings in this document are identified by a warning
triangle printed against a grey background.
Keywords at the start of a warning indicate the type and
seriousness of the ensuing risk if measures to prevent
the risk are not taken.
This symbol indicates important information where
there is no risk to people or property.
Symbol Explanation
▶ Step in an action sequence
Cross-reference to another part of the document
• List entry
– List entry (second level)
Table 1
1 General safety instructions and explanation of symbols
Logano plus SB325 – 6 720 806 328 (2013/07)
4
1.2 Safety regulations
Danger through failure to consider your own safety in an emergency
such as a fire
▶ Never put your life at risk. Your own safety is paramount.
If you smell gas
▶ Close the gas isolation valve.
▶ Open the windows.
▶ Never operate electrical switches, including telephones, plugs or
doorbells.
▶ Extinguish all naked flames.
▶ No open fire.
▶ Never smoke.
▶ Never use lighters.
▶ Warn all occupants of the building, but do not ring doorbells.
▶ Leave the building and telephone the national gas emergency service
on 0800 111999 from an outside phone.
If you smell flue gas
▶ Switch off the appliance.
▶ Open windows and doors.
▶ Notify an authorised contractor.
Electric shock hazard
▶ Before carrying out any work on the heating system, disconnect the
heating system from the power supply across all poles. For example,
activate the emergency stop switch outside the boiler room. It is not
enough to switch off the control unit.
▶ Secure power supply against unintentional reconnection.
▶ Observe country-specific rules and regulations when making the
electrical connection, commissioning, servicing and carrying out
maintenance.
Installation and conversion
Insufficient ventilation can lead to dangerous flue gas leaks.
▶ Only have the boiler installed or modified by a qualified heating
engineer.
▶ Never change any parts in contact with flue gas.
▶ Never cover or reduce the size of air vents in doors, windows or walls.
If draught-proof windows are fitted, ensure there is an adequate
combustion air supply.
▶ Ensure that the boiler installation room remains free from the risk of
frost.
▶ The heating system must be installed and operated in accordance
with the current applicable standards, rules and regulations.
Thermal disinfection
▶ Risk of scalding!
Monitor any operation with temperatures in excess of 60 °C.
Inspection and service
▶ Recommendation for customers: Arrange a service and inspection
contract with the service department of the manufacturer or with an
authorised contractor, covering an annual inspection and demand-
dependent service.
▶ The user is responsible for the general and environmental safety of the
heating system.
▶ Immediately correct all faults to prevent system damage!
▶ Use only genuine spare parts from the manufacturer. Losses caused
by the use of spare parts and accessories not supplied by the
manufacturer are excluded from the manufacturer's warranty.
Explosive and highly flammable material
▶ Never use or store highly flammable materials (paper, thinners, paints
etc.) near the boiler.
Combustion/room air
▶ Keep the combustion/ambient air free of corrosive substances
(e.g. halogenated hydrocarbons that contain chlorine or fluorine
compounds). This will help prevent corrosion.
▶ Keep the combustion air supply free of dust.
Instructing the customer
▶ Instruct the customer of the functions and operation of the appliance.
▶ Inform customers that any modifications or repairs must be carried
out by a qualified heating engineer.
Disposal
▶ Dispose of packaging in an environmentally responsible manner.
2 About the appliance
Logano plus SB325 – 6 720 806 328 (2013/07)
5
2 About the appliance
2.1 Type overview
2.2 Determined use
The Logano plus SB325 condensing boiler has been designed for hot
water heating systems in e.g. apartment buildings or industrial units.
The boiler is only approved for open flue operation.
Any pressure-jet gas burner type-tested to EN 676 can be used if its
operating range matches the boiler specifications.
Only burners that have been tested and approved for electromagnetic
compatibility (EMC) may be used.
2.3 Safety equipment
To ensure safe operation, the boilers must be equipped with the
following safety equipment:
• The level of safety equipment must comply with at least EN 12828.
• Also observe country-specific regulations if these specify further
requirements.
Equipment examples are included in chapter 11 , page 38. The
components comprising the safety equipment are available as
accessories.
2.4 EU Declaration of Conformity
The design and operation of this product conform to the applicable
European directives and supplementary national requirements.
Conformity has been demonstrated.
The Declaration of Conformity can be viewed at www.buderus.co.uk or
alternatively can be requested from your local Buderus sales office.
2.5 Scope of supply
▶ Upon receipt, check that all packaging is in perfect condition.
▶ Check the delivery is complete:
– 1 packed boiler supplied on a pallet.
– Technical documents, attached to boiler block.
– 1 boiler casing with thermal insulation and accessories, packed in a
carton.
– 1 siphon set supplied inside the combustion chamber.
– Insulating rings for blast tube supplied inside the combustion
chamber
It is possible that some of the standard accessories will not be necessary
for certain boiler types.
2.6 Required accessories
The following accessories are not part of the standard delivery but are
required to operate the boiler:
• Burner
• Boiler safety assembly
• Safety equipment
• Cleaning brushes
• Control unit.
2.7 Operating conditions
Type Output
SB325 50 kW, 70 kW, 90 kW, 115 kW
Tab. 2 Type overview
Observe all standards and directives applicable to the
installation and operation of this heating system in your
country. Observe the information on the data plate.
These are definitive and must be observed.
Set the burner to the rated heat input QN specified on
the data plate as a maximum.
Conditions of use Unit Value
Maximum permissible temperature,
high-limit safety cut-out
°C 110
Maximum operating pressure bar 4
Maximum number of burner starts per annum 15 000
Tab. 3 Conditions of use
Operating conditions Logano plus SB325 Logano plus SB325
Boiler water flow rate None –
in conjunction with a
Logamatic control unit
for modulating
operation.
None –
in conjunction with a
Logamatic control unit
4212 for constant boiler
water temperatures or
when supplemented by a
third party control unit.
Min. boiler water
temperature
Operating Interruption
(complete boiler shut-
down)
Heating system control
with mixing valve
Minimum return
temperature
Miscellaneous
1)2)
1) Maximum 15,000 burner starts per year. In order not to exceed the number of
burner starts, observe the information on setting the control unit and burner in the
technical guide or installation instructions. If this value is exceeded, however,
please contact the manufacturer's service department.
2) The number of burner starts per year is affected by the boiler system's operating
settings (controller parameters in the boiler controller and combustion setting)
and sizing to correspond with the consumers' heat demand. To avoid exceeding
the number of annual burner starts as a result of operating settings which have not
been optimised, the manufacturer offers a complete commissioning and regular
document inspections for floor standing residential conventional boilers, burners
and boiler controller (Logamatic control units with function modules).
1)
Tab. 4 Operating conditions
2 About the appliance
Logano plus SB325 – 6 720 806 328 (2013/07)
6
2.8 Suitable fuels
The boiler must only be operated with the specified fuels. Only burners
that are suitable for the specified fuels may be used.
Gas burner
Permissible fuels:
• Natural gas from the public gas supply in accordance with national
regulations with a total sulphur content < 50 mg/m
3
.
• LPG in accordance with national regulations with a content of
elementary sulphur 1.5 ppm and volatile sulphur 50 ppm.
2.9 Data plate
The data plate is supplied loose (located in the plastic wallet within the
sets of documents). Subject to the boiler location, attach it to the top
right or left of the side panel.
The data plate includes details of the serial number, output and approval
data.
2.10 Tools, materials and auxiliary equipment
For the installation and maintenance of the boiler, you require standard
tools, as used in space heating as well as gas and water installations, and
a torque wrench.
2.11 Product description
With the Logano plus SB325 floor standing condensing boilers, all parts
that come into contact with products of combustion or condensate are
made from high grade stainless steel. This makes operation possible
without limitations on the minimum return temperature, the flow rate or
the burner minimum load. It is also referred to in this manual SB325 as
the boiler or the heat appliance.
The SB325 has two separate thermohydraulic return connections for
the high and low temperature heating circuits. The SB325 must be
equipped with a burner that is suitable for the boiler. The boiler operates
according to the three-pass system ( Fig. 1).
Optional accessories are listed in the general catalogue.
The main components of the boiler are ( Fig. 2, page 7):
• Boiler shell [1] in conjunction with a burner
The boiler block transfers the heat produced by the burner to the
heating water.
• Thermally insulating casing
The boiler shell and thermal insulation reduce energy losses.
• Control unit (accessory)
The control unit monitors and controls all electrical boiler
components.
Fig. 1 Function diagram of the hot gas path in the floor standing
condensing boiler Logano plus SB325
[AA] Flue gas outlet
[RK1] Return connection for low temperature heating circuits
[RK2] Return connection for high temperature heating circuits
[VK] Flow connection
[1] Combustion chamber (1st pass)
[2] Upper condensation secondary heating surface
(condensing plus heating surface, 2nd pass)
[3] Water guide element
[4] Lower condensation reheating surface
(condensing plus heating surface, 3rd pass)
The combustion of biogas is not permitted.
If you contact the manufacturer with any questions about
this product, always provide the details on the data
plate. These details enable us to assist you specifically
and quickly.
The information on the type plate is binding and must be
observed!
NOTICE: System damage through the use of an
incorrect burner.
▶ Only use burners that meet the technical
requirements of the boiler ( chapter 2.12, page 8).
2
4
3
1
AA
RK1
VK
RK2
6 720 642 881-05.1il
2 About the appliance
Logano plus SB325 – 6 720 806 328 (2013/07)
7
Fig. 2 Boiler overview
[1] Boiler shell
[2] Combustion chamber door
[3] Reversing chamber door
[4] Boiler flow connection
[5] Test point (sensor pocket)
[6] Safety valve connection
[7] Connection for pressure switch
[8] Return connection 2 (high temperature return)
[9] Flue gas connection
[11] Drain/return connection 1 (low temperature return)
[12] Condensate outlet
6 720 804 354-03.1I
T
L
2
1
3
8
11
12
5
6
7
4
9
2 About the appliance
Logano plus SB325 – 6 720 806 328 (2013/07)
8
2.12 Specifications, dimensions, connections
The specifications provide information about the output profile of the
Logano plus SB325.
Fig. 3 Specifications, dimensions, connections
[A] Clearance
[AA] Flue gas connection
[AKO] Condensate outlet
[B] Boiler width incl. casing
[B
GR
] Base frame width
[B
E
] Handling width
[D
AA
] Internal diameter of the flue gas outlet
[EL] Drain point
[H] Boiler height incl. control unit
[H
AA
] Flue gas connection height
[H
AKO
] Condensate outlet height
[H
B
] Centre of combustion chamber door height
[H
K
] Boiler height
[H
RK1
] Height, boiler return connection 1
[H
MDW
] Height, minimum pressure switch connection
[H
RK2
] Height, boiler return connection 2
[H
VK
] Height, boiler flow connection
[H
VSL
] Height, safety valve connection
[L] Boiler length incl. casing
[L
BR
] Burner length
[L
K
] Boiler block length
[MDW] Connection for minimum pressure switch
[RK1] Boiler return connection 1 (low temperature return)
[RK2] Boiler return connection 2 (high temperature return)
[VK] Boiler flow connection
[VSL] Safety valve and flow safety line connections
(for open vented systems)
2.12.1 Measurements
L
VK
M
VSL
MDW
AKO
RK2
RK1/EL
L
K
L
GR
H
RK1
H
RK1
H
AA
H
RK2
H
MDW
H
VSL
H
VK
H
AKO
L
BR
D
AA
B
GR
B
A
H
K
H
H
B
6 720 804 354-01.1ITL
Boiler size 50 70 90 115
Length without burner
L mm 1084
L
K
mm 930
Burner length L
BR
mm Subject to burner
Width B mm 820
Height
H mm 1483
H
K
mm 1254
Width/height for transport mm 680/1215
Base frame length L
GR
mm 600
Base frame width B
GR
mm 680
Clearance O mm 286
Flue gas outlet (internal)
Ø D
AA
mm 153 183
H
AA
mm 357 327
Combustion chamber
Length mm 890
Ø mm 370
combustion chamber door
Depth mm 95 70
H
B
mm 874
Tab. 5 Unit data
2 About the appliance
Logano plus SB325 – 6 720 806 328 (2013/07)
9
2.12.2 Unit data
Boiler flow
1)
.
Ø VK DN R 1 ½
H
VK
mm 1178
Drain/boiler return 1
1)
Ø RK1 DN R 1 ½
H
RK1
mm 156 106
Boiler return 2
1)
Ø RK2 DN R 1 ¼
H
RK2
mm 506
Safety valve/Flow
safety line
2)
Ø VSL DN R 1
H
VSL
mm 1069
Minimum pressure switch
connection
3)
MDW DN G ¼
Condensate outlet
External diameter mm 32
H
AKO
mm 257.5 207.5
1) According to DIN 2633 PN
2) According to EN 1092-1 PN 16.
3) As a replacement for low water level limiter
Boiler size Abbreviations Unit 50 70 90 115
Rated heat input for gas
[burner output Qn (H
i
)]
Full load, max. kW 47.4 66.4 85.3 109.0
Partial load 40 % kW 19.0 26.6 34.1 43.6
Net weight kg 294 300 314 321
Water content l 237 233 250 240
Gas content l 90 120 138 142
Available draught Pa 50
1)
/subject to burner
1) Maximum recommended pressure difference
Pressure drop on the hot gas side mbar 0.43 0.50 0.59 0.77
Pressure drop on the water side mbar Fig. 4 , page 10
Standby loss % Fig. 5, page 10
Maximum flow temperature
2)
2) Safety limit (high limit safety cut-out). Maximum possible flow temperature = safety limit (high limit safety cut-out setting) - 18 K.
Example: Safety limit (high limit safety cut-out) = 100 °C, max. possible flow temperature = 100 - 18 = 82 °C.
°C 110
Maximum operating pressure bar 4
Boiler with CE designation CE-0085 AT 0074
Tab. 6 Unit data
Boiler size 50 70 90 115
Tab. 5 Unit data
2 About the appliance
Logano plus SB325 – 6 720 806 328 (2013/07)
10
2.12.3 Values for calculating the flue gas
Fig. 4 Pressure drop on the water side
[p
H
] Pressure drop on the heating water side
[V
H
] Flow rate
Fig. 5 Standby loss subject to the average boiler water temperature
[q
B
] Standby loss
[
K
] Average boiler temperature
Boiler size Abbreviations Unit 50 70 90 115
System temperatures 50/30 °C
Rated output, gas
Full load kW 50.0 70.0 90.0 115.0
Partial load 40 % kW 20.0 28.0 36.0 46.0
Flue gas temperature
1)
1) Calculated flue gas temperature for cross-sectional calculation according to EN 13384 (averages across the series). The measured flue gas temperature may differ, depending
on the burner setting and actual temperature of the system.
Full load °C 45 45 45 45
Partial load 40 % °C 30 30 30 30
Flue gas mass flow rate
Full load kg/s 0.0189 0.0268 0.0344 0.0443
Partial load 40 % kg/s 0.0074 0.0103 0.0133 0.0171
System temperatures 80/60 °C
Rated output, gas
Full load kW 46.0 64.4 82.7 105.7
Partial load 40 % kW 18.4 25.8 33.1 42.3
Flue gas temperature
1)
Full load °C 72 72 72 72
Partial load 40 % °C 40 40 40 40
Flue gas mass flow rate
Full load kg/s 0.0198 0.0277 0.0357 0.0458
Partial load 40 % kg/s 0.0079 0.0111 0.0143 0.0183
CO
2
content, gas % 10
Tab. 7 Unit data
Δp
H
[mbar]
V
H
[m
3
/h]
6 720 804 354-17.1ITL
100
10
1
110100
0,7
0,6
0,5
0,4
0,3
0,2
0,1
0
20
3040506070
ϑ
K
[°C]
q
B
[%]
6 720 804 354-16.1ITL
3 Information on installation and operation
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3 Information on installation and operation
Installer:
• An installer is a competent person who has extensive, specialist,
theoretical and practical knowledge, as well as experience in the
specialist area and is familiar with applicable standards.
Contractor:
• A contractor is an organisational unit of the industrial sector with
specially trained personnel.
3.1 Standards, regulations and directives
Observe all technical guidelines, country-specific regulations and
standards applicable to installation and operation. These include the
following:
• Local Building Regulations concerning boiler room installations.
• Local Building Regulations regarding ventilation, air supply and
extraction equipment as well as connection to a flue gas system.
• Requirements for the electrical connection to the power supply
(such as codes of practice and EN standards).
• The technical rules of the gas supplier regarding the connection of a
gas appliance to the local mains gas supply.
• Regulations and standards concerning the safety equipment level
of water-filled heating systems
The level of safety equipment must be at least compliant with EN
12828. Also observe country-specific regulations if these specify
further requirements.
3.2 Notes on low water level limiter (LWI)
▶ For boilers < 300 kW, install a low water level limiter.
For installation and operation, refer to the technical documents
provided by the manufacturer.
▶ If the LWI connection provided is not used for the installation of a
SYR 932.1 low water indicator (accessory), seal the connection off
with a plug ( chapter 5.7, page 21).
3.3 Tightness test
▶ A leak test has to be carried out in accordance with local regulations.
The test pressure depends on the actual pressure in the heating
system and should be 1.3 times the prevailing pressure or at least
1 bar.
3.4 Duty to obtain a permit and provide notification
• The local gas supplier might need to be notified of and approve the gas
boiler installation.
• Please note that regional approvals may be required for the flue
system and condensate connection to the public sewage system.
• Prior to commencing installation, inform the relevant bodies and the
water board.
3.5 Burner selection and settings
The sizing and settings of the burner have a significant influence on the
service life of the heating system. Every load cycle (burner on/off)
causes thermal stresses (loads on the boiler shell). The number of
burner starts must therefore not exceed 15,000 per year.
The following recommendations and settings are designed to meet this
criterion (see also information on setting the control unit and the
hydraulic connection to the heating system). If you still cannot meet
this criterion, please contact the sales or service department address
can be found on the last page).
• Set the burner output as low as possible. Set the burner to the
rated heat input QN specified on the data plate as a maximum.
Never overload the boiler!
• Take fluctuating net calorific values of the gas into account;
check the maximum value with the gas supplier.
• Only use burners that are suitable for the specified fuels.
Observe the burner manufacturer's instructions.
• Burners must only be adjusted by heating engineers!
3.6 Installation requirements
The installation room must meet the following conditions:
• In the boiler installation room, an ambient temperature of between
0 °C and 35 °C must be ensured.
• The installation room must be equipped with the required combustion
air vents.
• An adequate supply of fresh air must be ensured.
3.7 Ventilation requirements
Ventilation for combustion and cooling should be provided in the boiler
house in accordance with BS 6644 and IGE/UP/10. The tables below
may be used for guidance.
3.7.1 Open flue boilers
Opening free area sizes given in cm² per kW net.
3.7.2 Room sealed boilers
Opening free area sizes given in cm² per kW net.
▶ Never restrict or block ventilation openings. Keep the ventilation
openings clear at all times.
▶ Never install system components that could be damaged by frost near
the combustion air vents. If necessary, install a device to preheat the
ventilation air (e.g. a heater bank in the combustion air vent).
▶ Never store flammable materials or liquids in the immediate vicinity of
the heat source.
Observe all standards and guidelines applicable to the
installation and operation of this system in your country.
The details on the data plate are definitive and must be
observed.
▶ For boilers < 300 kW, a minimum pressure limiter can
be installed instead of a low water indicator in
accordance with EN 12828.
The number of burner starts can be checked in the MEC
( chapter 3.12, page 12), on the third-party control
unit or alternatively on the burner control unit.
Take into account additional consumers of ventilation air
(e.g. compressors) when sizing.
% Load in Summer Low level High level
50 4 2
75 5 3
100 6 4
Table 8
% Load in Summer Low level High level
50 2 2
75 5 5
100 6 6
Table 9
3 Information on installation and operation
Logano plus SB325 – 6 720 806 328 (2013/07)
12
3.8 Combustion air quality
▶ Keep the supply of combustion air free of corrosive substances
(e.g. halogenated hydrocarbons that contain chlorine or fluorine
compounds).
This will help prevent corrosion.
▶ Never use or store chlorinated cleaning agents or halogenated
hydrocarbons (as contained in spray cans, solvents or cleaning
agents, paints and adhesives, for example) in the boiler room.
▶ Keep the combustion air supply free of dust.
▶ If building work is taking place in the installation room and creating a
lot of dust, shut the boiler down. A burner contaminated during
building work must be cleaned before commissioning.
3.9 Heating water quality
The quality of the fill and top-up water is an essential factor for increased
efficiency, functional reliability, long service life and for maintaining the
constant operational condition of a heating system. If the system is filled
with water that has a high calcium hardness, this will be deposited on the
heat exchanger surfaces and will restrict the transfer of heat to the
heating water. As a result, the wall temperatures of the stainless steel
heat exchanger surfaces will rise and the thermal stresses (loads on the
boiler shell) will increase.
This is why the quality of the fill or top-up water must meet the conditions
stipulated in the operator's log provided and be recorded in this log.
3.10 Using antifreeze
Antifreeze based on glycol has been used in heating systems for many
years, for example Antifrogen N manufactured by Clariant.
The use of other types of antifreeze should not be a cause for concern if
the product is comparable with Antifrogen N.
Observe the antifreeze manufacturer's instructions. Follow the
manufacturer's details regarding mixing ratios.
The specific thermal capacity of Antifrogen N antifreeze is lower than the
specific thermal capacity of water. To enable the transfer of the required
heat output, increase the required flow rate accordingly. This should be
taken into account when sizing the system components (e.g. pumps)
and the pipework.
As the heat transfer medium has a higher viscosity and density than
water, take the higher pressure drop through the pipework and other
system components into account.
Check the resistance of all plastic or non-metallic components in the
system separately.
3.11 Electrical installation
3.12 Control unit settings
The purpose of optimum control unit settings is to achieve long burner
runtimes and avoid rapid temperature changes in the boiler. Gentle
temperature changes result in a longer service life of the heating system.
The control strategy of the control unit must therefore be prevented
from becoming ineffective, i.e. through the boiler water controller
switching the burner on and off.
▶ Maintain the minimum differential between the selected shutdown
temperature of the high limit safety cut-out, the temperature
controller, the maximum boiler water temperature and the maximum
temperature demand ( Tab. 10, page 12).
▶ Select set temperatures for the heating circuits that are as low as
possible.
▶ Start heating circuits (e.g. when starting up in the mornings) in
5-minute intervals.
Settings for boiler water controller and maximum boiler water
temperature
The boiler water controller is only designed to provide emergency
operation with an adjustable boiler water temperature if the control
electronics fail. In standard control mode, the function of the boiler
water controller is provided by the maximum boiler water temperature.
The maximum boiler water temperature can be selected in the control
unit in the "Boiler parameters" menu, under menu item "Max. shutdown
temperature".
Chemical additives that are not certified as harmless by
the manufacturer must not be used.
DANGER: Risk to life and of system damage through
faulty connections.
▶ Only carry out electrical work if you are a qualified
electrician.
▶ Observe local installation regulations
( chapter 3.1).
▶ The electrical installations must be suitable for damp
areas.
▶ The system installer must issue a wiring diagram
which records the interface between heating output
elements, burner, control unit (Logamatic) and
additional safety equipment.
We recommend using a Buderus Logamatic control unit
from the 4000 series.
The maximum boiler water temperature can be selected
on the control unit (MEC) in the "Boiler parameters"
menu, under menu item "Max. shutdown temperature".
If a control unit from the Buderus Logamatic 4000 series
is used, burner modulation in standard mode is not
enabled for 3 minutes. Never modulate upwards more
quickly than this.
Adjustable parameter
(max. temperature)
Logamatic
4321
Logamatic
4211
High limit safety cut-out
(STB)
1)
1) Set the high limit safety cut-out and temperature controller as high as possible,
but ensure the settings are at least 5 K apart.
110 °C 110 °C
at least 18 K
 minimum 5 K
Temperature controller
(TR)
1)
105 °C 90 °C
 minimum 6 K
Max. boiler water
temperature
99 °C 84 °C
 minimum 7 K 
Max. temperature
demand
2)
of HK
3)
and
DHW
4)
2) Both temperature demands must always be at least 7 K below the maximum boiler
temperature.
3) The temperature demand of heating circuits equipped with an actuator is
composed of the set flow temperature and parameter "Boiler rise" in the heating
circuit data menu.
4) The temperature demand of DHW heating is composed of the set DHW
temperature and parameter "Boiler rise" in the DHW menu.
92 °C 77 °C
Tab. 10 Adjustable parameters Logamatic 4321 and Logamatic 4211
3 Information on installation and operation
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13
Control unit settings
Fig. 6 Control unit settings
[1] High limit safety cut-out
[2] Temperature control unit
[3] MEC
▶ Select temperatures ( Tab. 10, page 12) at high limit safety cut-out
[1] in the control unit and at temperature controller [2].
▶ Select the maximum boiler water temperature at the MEC [3].
Example DHW demand:
Sum of the set DHW temperature (60 °C) and parameter "Boiler rise"
(20 °C) in the "DHW" menu:
60 °C + 20 °C = Maximum temperature demand 80 °C
Example heating circuits:
Sum of the set temperature of the heating circuit with mixer with the
highest temperature required (70 °C) and parameter "Boiler rise" (5 °C)
in the "Heating circuit data" menu:
70 °C + 5 °C = Maximum temperature demand 75 °C
Notes on setting third party control units
• The third party control unit (building management system or PLC
controllers) must ensure a maximum internal boiler water
temperature that is sufficiently different from the high limit safety cut-
out. It must also be ensured that the control electronics rather than
the boiler water controller switch the burner on and off.
• The control unit must ensure that the burner is switched to low load
before being shut down. If this is not observed, the safety shut-off
valve (SAV) in the gas train may lock out.
• Select control equipment that allows a gentle start-up with a time
delay when the system is cold.
• After the burner enable, an automatic timer (for example) should limit
the burner to low load for a period of approx. 180 seconds.
A restricted heat demand will prevent uncontrolled cycling of the
burner.
• It must be possible to show the number of burner starts on the control
unit used (or alternatively on the burner control unit).
6 720 648 053-38.2T
1 2 3
80
The maximum temperature demand is not a value that is
directly selected. The maximum temperature demand is
composed of the set temperature and the rise.
All maximum temperature demands must always be 7 K
below the maximum selected boiler water temperature.
NOTICE: System damage due to incorrect sensor
position!
The sensors of the high limit safety cut-out (STB) and of
the thermostat (TR) must be fitted at the installation
location ( Fig. 31, page 26) on the top of the boiler.
▶ In the case of third party control units, match the
sensor immersion sleeve to the diameter of the
sensors used.
▶ Do not change the length of the immersion sleeve.
Observe the operating conditions in chapter 2.7, page 5
and observe chapter 5.13, page 26 when installing
sensors.
Unit Value
Maximum time constant of temperature
controller
s 40
Maximum time constant on pressure switch/
limiter
s 40
Minimum temperature difference between
burner turning on and off
K 7
Tab. 11 Conditions of use
3 Information on installation and operation
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14
3.13 Hydraulic connection to the heating system
▶ If the system temperatures are different, use both return connectors
RK1 (bottom) and RK2 (top).
▶ Connect heating circuits with high return temperatures to connector
RK1, and heating circuits with low return temperatures to connector
RK2.
▶ Restrict the flow rate in the boiler to a maximum temperature
difference of at least 7 K between flow and return.
▶ Size the pump correctly.
▶ Before connecting the boiler, flush sludge and dirt out of the heating
system.
▶ Ensure that no oxygen enters the heating water during operation.
▶ We recommend to operate the boiler in sealed unvented systems
wherever possible.
If the boiler is nonetheless used in an open vented heating system,
additional measures are required to protect against corrosion and
prevent sludge entering the boiler. Please note, the safety equipment
required for boilers installed on open vented systems vary significantly
from those on pressurised heating system.
▶ Consult the manufacturer's sales or service department for further
advise.
Information on cascade circuits:
▶ Use the actual output the boilers have been commissioned to when
sizing boiler primary pumps. The actual boiler output may vary from
the maximum output of the appliance.
▶ Ensure identical temperature differences between flow and return on
all boilers fitted in a cascade.
3.14 Setting the minimum and maximum pressure limiters
Maximum pressure limiter
The maximum pressure limiter (accessory) must be set in such a way
that the safety valve is prevented from releasing excess pressure. To
achieve this, the setting on the maximum pressure stat must be set to
0.5 bar below the discharge pressure of the safety valve. The maximum
safety pressure of the boiler's safety valve depends on the size of the
boiler ( Tab. 5, page 8).
Example:
Safety valve pressure: P
SV
= 5 bar
Setting value, maximum pressure limiter:
5 bar 0.5 bar = 4.5 bar
Minimum pressure limiter
The minimum pressure limiter (not part of the standard delivery)
(accessory) must be set in such a way that no steam bubbles form in the
boiler while still operating the boiler safely.
This setting depends on the system conditions and the siting of the
boiler system. The set point is based on the boiling pressure
corresponding the the maximum high limit stat setting (fixed at 0.5bar)
and the static head to the highest point within the heating system.
Example:
Boiler system with high limit safety cut-out setting = 110 °C
Highest consumer above the boiler = 12 m
(10 m equates to approx. 1 bar) g 1.2 bar
Safety margin = 0.2 bar (fixed value)
Response pressure P
min
= 0.5 bar + 1.2 bar + 0.2 bar = 1.9 bar
3.15 Pressure maintenance
▶ Size the expansion vessels correctly.
▶ Set the pre-charge pressures correctly.
If using pump-controlled pressure maintaining systems, pressure
fluctuations will occur very frequently depending on the design of the
system and the appliance settings. Even if these pressure fluctuations
appear small, if they occur very frequently they may cause considerable
damage to the boiler, as it is designed for a predominantly static
pressure load.
To protection against damage:
▶ Ensure that every heat source is equipped with an individual
expansion vessel.
▶ Set the pre-charge pressure of the expansion vessel correctly.
For an optimum energy yield, we recommend supplying
a flow rate of 10 of the total nominal flow rate via
connector RK1, with a return temperature below the
dew point.
Only return connector RK1 needs to be connected if only
one return connection is used.
Restriction of the temperature spread is not necessary if
the system is equipped with a sludge separator.
High flow rates and oversized pumps can result in the
accumulation of sludge or deposits on the heat
exchanger surfaces.
The setting procedure for the maximum pressure limiter
can be found in the documentation provided with the
pressure limiter.
The setting procedure for the minimum pressure limiter
can be found in the documentation provided with the
pressure limiter.
4 Transport
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15
4 Transport
▶ The boiler can be transported by crane, forklift truck or several pallet
trucks.
▶ When raising and transporting the boiler, make sure that the weight is
distributed evenly across the forks of the forklift truck/pallet truck.
4.1 Securing the load
To secure the load during transportation:
▶ The boiler is transported upright on a pallet.
▶ Pull securing straps (fixing straps, chains) over the boiler shell and
secure them to the transport vehicle.
4.2 Moving the boiler with a crane, forklift truck or two
pallet trucks
The boiler can be transported by crane, forklift truck or several pallet
trucks.
4.2.1 Lifting the boiler with a crane
▶ Hang lifting rope hooks on the designated lifting eyes on the top of the
boiler.
▶ Attach the hoist/crane lifting hooks to the lifting rope.
Fig. 7 Lifting the boiler with a crane
[1] Crane hooks with safety mechanisms
[2] Lifting eyes
DANGER: Risk to life from inadequately secured boiler.
▶ Use suitable means to transport the boiler (e.g.
several pallet trucks, a forklift truck or a crane).
▶ When transporting, secure the boiler to the method of
transport to prevent it slipping.
DANGER: Risk to life through falling load.
▶ Only use lifting ropes of the same length.
▶ Only use lifting ropes that are in perfect condition.
▶ Only hang hooks on the designated eyebolts on the
top of the boiler.
▶ Do not hang hooks on the connectors.
▶ Only lift the boiler with a crane if you are suitably
qualified to operate the crane.
The end stop's tilt angle must be 90 °.
1
2
90°
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4 Transport
Logano plus SB325 – 6 720 806 328 (2013/07)
16
4.2.2 Moving the boiler with a forklift truck
▶ Insert the forks of the forklift truck under the front and the back panels
of the boiler ( Fig. 8).
▶ Slowly lift the boiler with the forklift truck.
Fig. 8 Moving the boiler with a forklift truck
4.2.3 Moving the boiler with two pallet trucks
▶ Push one pallet truck underneath each of the boiler front and back
panels.
▶ Lift the boiler evenly with the pallet trucks.
Fig. 9 Moving the boiler with two pallet trucks
DANGER: Risk to life through falling load.
▶ Distribute the boiler weight evenly across the forklift
truck/pallet truck when lifting and moving the boiler.
▶ Observe the weight of the boiler and that of the means
of transport.
▶ When transporting, secure the boiler to prevent it
falling.
NOTICE: System damage due to damaged boiler shell.
Only move the boiler with a forklift truck if the forks are
long enough to reach right under the boiler.
▶ Prior to lifting the boiler, check that the front and back
panels of the boiler are supported by the forks of the
forklift truck.
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5 Installation
5.1 Siting the boiler
Installation room requirements:
• The support surface must provide sufficient load-bearing capacity
and solidity.
• The installation room must be dry and free from the risk of frost.
• The size of the installation room must be adequate to ensure correct
operation.
Minimum wall clearances
Observe the specified minimum wall clearances for the foundations or
installation surface ( Fig. 10, and Tab. 12, page 17). The surface on
which the boiler is to be positioned must be of load-bearing capacity,
even and level. The front edge of the boiler should be flush with the edge
of the plinth.
The combustion chamber door can be fitted to open from right to left or
vice-versa ( chapter 5.10 from page 24).
Fig. 10 Installation room (for dimensions see Tab. 12), dimensions
in mm
[1] In addition to the burner length, take dimension A2 into
consideration when installing a third party
burner.
[2] If using a flue gas silencer, take its installation dimensions into
account.
[3] Take account of burner dimensions - available from burner
manual.
It is advantageous if there is a drain in the vicinity of the installation
location.
For the installation and operation of the heating system,
observe all country-specific standards, guidelines and
local regulations.
The information on the data plate is binding and must be
observed.
DANGER: Risk to life through poisoning!
Insufficient ventilation can lead to dangerous flue gas
leaks!
▶ Never close off or reduce the size of ventilation and
extract air vents.
▶ Never operate the boiler unless faults are rectified
immediately.
▶ Inform the operator in writing of any faults and their
associated risks.
DANGER: Risk of fire through flammable materials or
liquids.
▶ Never store flammable materials or liquids in the
immediate vicinity of the heat source.
NOTICE: System damage due to frost!
▶ Install the heating system in a room protected from
the risk of frost.
Allow extra space if a flue gas silencer or a control unit
are to be installed on one side of the boiler.
If separation between the installation location and the
boiler is required to prevent the transfer of structure-
borne noise, apply anti-vibration measures (e.g. anti-
vibration supports) before installing the boiler.
Boiler size 50 kW 70 kW 90 kW 115 kW
A
1
1)
1) If using a flue gas silencer, take its installation dimensions into account.
700
(400)
A
2
2)
2) In addition to the burner length, take dimension A2 into consideration when
installing a third party burner.
1200
(700)
Length L 1084
Width B 820
Foundation
length
1084
Foundation
width
680
Tab. 12 Recommended (and minimum) wall clearances mm
2
3
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18
5.2 Levelling the boiler
To prevent air collecting in the boiler, level the boiler horizontally.
▶ To do this, place a spirit level on the boiler shell.
▶ Level the boiler horizontally using the spirit level.
Fig. 11 Levelling the boiler
5.3 Fitting the thermal insulation
▶ Slide the thermal insulation mat underneath the boiler.
Fig. 12 Sliding the thermal insulation mat underneath the boiler
[1] Hinge pin
[2] Door bolts
[3] Dowel pin
▶ Wrap thermal insulation mats around the boiler shell so that they
overlap and fix at the top with 5 spring hooks [1] ( Fig. 13).
▶ Close off the cut-out for the flow with two spring hooks [1]
( Fig. 13).
▶ Undo the door bolts [2] and open the combustion chamber door
( Fig. 12).
▶ Place the lower front thermal insulation section [4] on the front of the
boiler shell and secure to the right and the left onto the wrap-around
thermal insulation mat with two spring hooks [1] on each side
( Fig. 13).
▶ Position the thermal insulation strip [2] at the top around the boiler
shell ring, and secure to the right and the left onto the lower front
insulation section with two spring hooks on each side [1] ( Fig. 13).
▶ Place the upper front insulation section [3] on the front of the boiler
shell.
Fig. 13 Fitting and fastening the lagging
[1] Spring hooks
[2] Strip of lagging material
[3] Upper front thermal insulation section
[4] Lower front thermal insulation section
▶ Close the combustion chamber door and secure with door bolts [2]
( Fig. 12, page 18).
Use metal shims to level the boiler.
WARNING: Risk of injury through combustion chamber
door dropping off when opened!
▶ Make sure that the hinge pin and dowel pin
( Fig. 12, [1]) are inserted correctly.
When fitting the insulation, ensure that the fabric
backing is arranged on the outside and the cut-outs at
the rear.
6 720 804 354-07.1ITL
6 720 804 354-08.1ITL
2
1
3
Be aware of cut-outs for hinge brackets and threaded
sleeves when fitting the combustion chamber door.
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▶ Place the rear thermal insulation section [1] onto the back panel of
the boiler in the position dictated by the recesses and secure to the
right and the left onto the wrap-around thermal insulation mat with
two spring hooks on each side.
Fig. 14 Positioning and securing the rear insulation section
[1] Rear panel insulation
5.4 Flue gas and water connections for heating system
5.4.1 General requirements of the flue system
Implementing the following recommendations concerning to the
installation of flue systems should guarantee trouble-free operation of
the combustion system. Failure to observe these requirements can
result in substantial operating problems during combustion and may
even result in explosions.
These are frequently acoustic disturbances, compromised combustion
stability or excessive vibrations on assemblies or their components. Low
NOx combustion systems are to be viewed as being more sensitive to
operating faults on account of their combustion control. Therefore,
engineer and implement the flue system with particular care.
The flue system consists of a connection piece between the heat source
and the vertical flue system itself (chimney).
When sizing and implementing the flue system, comply with the
following requirements:
• Size flue systems in accordance with the respective national and local
regulations and applicable standards.
• When selecting the material for the flue system, take into account the
composition and temperatures of the flue gas to prevent damage and
contamination of the system components that are in contact with flue
gas.
• Only flue systems, which are approved for a flue gas temperature of at
least 120 °C, may be used.
• Route the flue gas as directly as possible to the chimney considering
the best possible flow characteristics (e.g. short, rising, and with the
fewest possible bends). Provide a separate vertical flue for each
boiler. Take the thermal expansion of the system into account.
• Implement deviations in the connection pieces as favourably as
possible where flow is concerned by using bends or deflectors.
Connection pieces with several deviations should be avoided, as they
would have a detrimental effect on air-borne and structure-borne
noise as well as the start-up pressure hammer. Prevent sharp-edged
joints between rectangular connection flanges and the connection
pipe. As with any reductions/expansions that may be required, the
angle of the joint should not exceed 30°.
• Where possible, connection pieces should be joined to the chimney to
provide optimum flow characteristics and with an incline (at an angle
less than 45°). Any terminal pieces at the chimney outlets must
ensure the free discharge of flue gas into atmosphere.
• Any condensate must be able to drain freely over the entire length,
be treated and drained off in accordance with local regulations.
• Provide inspection pieces in accordance with local regulations,
if necessary after discussion with the local authorising body.
• The chimney must be separated from the boiler (e.g. with
compensators) to prevent the transfer of structure-borne noise.
• If a flue gas damper is installed in the flue system, integrate an "OPEN"
limit switch into the boiler control system for safety reasons.
Combustion must only be able to start when the feedback from the
limit switch confirms that the flue damper is fully open. A temperature
drop inside the boiler is possible on account of the time it takes the
actuator to move the damper into position. Set the "CLOSE" limit
position at the flue gas damper in such a way that it never closes fully.
This prevents damage to the fitted burner through heat build up.
5.4.2 Connecting the flue gas system
▶ Connect the connecting piece onto the flue outlet and the flue gas
system (chimney).
▶ Support the connecting piece if necessary.
5.4.3 Fitting a sealing collar (accessory)
▶ Fit the sealing collar in accordance with the installation instructions
supplied.
5.4.4 Connecting the boiler to the pipework
DANGER: Risk to life through poisoning!
Insufficient ventilation can lead to dangerous flue gas
leaks!
▶ Never close off or reduce the size of ventilation,
supply and extract air vents.
▶ Never operate the boiler unless faults are rectified
immediately.
▶ Inform the operator in writing of any faults and their
associated risks.
NOTICE: System damage due to leaking connections!
▶ Connect pipes without stress to the boiler
connections.
Boiler contamination on the water side is not
permissible.
If required to prevent contamination, install a sludge
separator in the boiler return.
5 Installation
Logano plus SB325 – 6 720 806 328 (2013/07)
20
Connecting the heating return
The boiler has two inlet options for the return water. If separate system
returns for differing return temperatures are used (e.g. underfloor
heating, DHW heating), these can be routed to the boiler via separate
return connections.
• RK2 = High return temperature (e.g. DHW heating)
• RK1 = Low return temperature (e.g. underfloor heating)
If there are no varying return temperatures, return connection RK1 is
used.
▶ Connect the heating system return to the appropriate boiler return
connection RK1/RK2.
▶ Close off unused connections with a plug or blank flange.
Fig. 15 Boiler connections
[AA] Flue gas connection
[AKO] Condensate outlet
[EL] Drain connection
[M] Test point (sensor pocket); closed off with plug
[MDW] Minimum pressure switch (alternative to low water indicator)
[RK1] Return connection 1
[RK2] Return connection 2
[VK] Boiler flow connection
[VSL] Flow safety line/safety valve connections
[WMS] Low water level limiter
Connecting the heating flow
▶ Connect the heating system flow to the boiler flow connection [VK].
Connecting the safety valve
▶ Connect the safety valve to the flow safety line connection [VSL]
( Fig. 15, page 20).
For open vented systems, the safety pipe flow is connected to the
[VSL] connection.
5.5 Installing the condensate hose and neutralising
system
▶ Fit the siphon provided [3] to the condensate drain [5].
▶ Undo cap [2] and fill siphon with approximately two litres of water.
Fig. 16 Installing the condensate hose
[1] Connection bend
[2] Cap
[3] Siphon
[4] Siphon outlet to neutralising system or drain
[5] AKO condensate drain
Please refer to the separate installation instructions for installation and
maintenance of the neutralisation system.
NOTICE: System damage through connecting the wrong
assemblies to the flow safety line.
▶ Never connect a DHW cylinder or other heating circuit
to the flow safety line.
VK
M
VSL
MDW
AKO
RK2
RK1/EL
6 720 804 354-15.1ITL
AA
DANGER: Risk to life through poisoning!
Open connections or siphons not filled with water can
cause escaping flue gas.
▶ Filling the siphon with water.
▶ Ensure that the siphon and flue gas connections are
sealed.
▶ Ensure that the sealing washer with gasket is seated in
the cap.
NOTICE: System damage through condensate.
▶ Always keep the condensate drain pipe clear and
working.
▶ Ensure that the condensate drain pipe and
neutralising system are working.
When installing the condensate line, observe the
following:
▶ Carefully and correctly route the condensate created
inside the boiler and possibly in the flue.
▶ Drain the condensate into the public sewerage system
in accordance with the requirements in your country.
▶ Observe regional regulations.
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Buderus Logano plus SB325 Installation And Service Instructions Manual

Buderus
Brand
Buderus
Model
Logano plus SB325
Category
Kitchen & houseware accessories
Type
Installation And Service Instructions Manual
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