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2
About the appliance
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
The combustion of biogas is not permitted.
Permissible fuels:
• Natural gas from the public gas supply in accordance with national
regulations with a total sulphur content < 50 mg/m
• LPG in accordance with national regulations with a content of
elementary sulphur 1.5 ppm and volatile sulphur 50 ppm.
2.9
Data plate
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!
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.
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).
6
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.
3
.
VK
RK2
AA
RK1
Fig. 1 Function diagram of the hot gas path in the floor standing
[AA]
[RK1]
[RK2]
[VK]
[1]
[2]
[3]
[4]
condensing boiler Logano plus SB325
Flue gas outlet
Return connection for low temperature heating circuits
Return connection for high temperature heating circuits
Flow connection
Combustion chamber (1st pass)
Upper condensation secondary heating surface
(condensing plus heating surface, 2nd pass)
Water guide element
Lower condensation reheating surface
(condensing plus heating surface, 3rd pass)
Logano plus SB325 – 6 720 806 328 (2013/07)
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2
3
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6 720 642 881-05.1il
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