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The number of burner starts can be checked in the MEC
on the third-party control unit or alternatively on the
burner control unit.
2.4
Suitable fuels
The boiler must only be operated with the specified fuels. Only burners
that are suitable for the specified fuels may be used.
Your heating contractor has entered the required type of fuel in tab. 4,
chapter 10, page 10.
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.
2.5
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 data plate is binding and must be
observed!
The data plate includes details of the serial number, output and approval
data.
2.6
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 flow and return temperature, the flow rate or
the burner low load. It is also referred to in this manual 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
functions according to the three-pass system ( Fig. 1).
The main components of the boiler are ( Fig. 2, page 5):
• Boiler body [3] in conjunction with a burner [2]
The boiler block transfers the heat produced by the burner to the
heating water.
• Thermally insulating casing [3]
The boiler shell and thermal insulation reduce energy losses.
• Control unit [1]
The control unit monitors and controls all electrical boiler
components.
Logano plus SB325 – 6 720 806 353 (2012/07)
VK
RK2
AA
RK1
Fig. 1 Function diagram of the hot gas path in the floor standing
3
.
[AA]
[RK1]
[RK2]
[VK]
[1]
[2]
[3]
[4]
1
2
Fig. 2 Boiler overview
[1]
[2]
[3]
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 secondary heating surface
(condensing plus heating surface, 3rd pass)
Control unit
Burner
Boiler shell with insulation and boiler casing
About the appliance
2
1
2
3
4
6 720 642 881-05.1il
3
6 720 804 353-01.1ITL
5
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