2 x Product description
8
BA ROTEX A1 BG Inline - 10/2007
2.2 Brief description
The ROTEX gas condensing boiler from the series A1 BG xxi is a completely pre-assembled gas condensing unit.
Operating instructions
The ROTEX gas condensing boiler A1 BG xxi is designed in such a way that it can be operated independently of ambient air. The
burner sucks the combustible air directly from the outside through an installation shaft or a double-walled flue gas duct. This
method has several advantages:
– The heating room does not need any air suction opening to the outside and therefore does not cool down.
– Lower energy consumption.
– Additional energy recovery in the flue gas duct by preheating of the combustible air.
– Dirt from the burner environment is not sucked in. The heating room can thus be used as a workspace, laundry room etc. at
the same time.
– Possible to install in loft areas or attic.
– Possible to install in garages.
The condensation that occurs need not, as a rule, be neutralised and can therefore pass directly to drainage through a plastic tube.
Safety management
The entire safety management of the gas condensing boiler is managed through an electronic control panel. If there is water
shortage, gas shortage or undefined operating conditions, there is a safety shutdown. A corresponding error message shows the
technician all the necessary information needed for troubleshooting.
Electronic control
A full electronic digital control panel, together with the "intelligent" automatic firing unit for the burner, controls all the heating
and hot water functions fully automatically for the direct heating circuit, an optional connectable mixed heating circuit as well
as a storage tank charging circuit.
All settings, displays and functions are carried out by the ROTEX-THETA control. A multi-language clear text display and the
keyboard offer multiple and comfortable options for operation.
The gas condensing boiler flexibly adjusts its output to changing demands. The heating output is a controlled stepless modulation
in the range 5-25 kW (A1 BG 25i) or 8-40 kW (A1 BG 40i). The flue gas temperature always remains below 90 °C.
To increase comfort, a digital room station (ROTEX THETA RS, 15 70 18) or a room control set (THETA RFF,
15 40 70) are also available as options.
Water connection
The gas condensing boiler has a joint inflow and return flow for the heating circuit and storage tank charging. The connections
are placed on the rear of the unit (refer to Fig 2-3).
Condensing technology
Condensing technology makes optimum use of the energy contained in the heating gas. The flue gas is cooled in the boiler and,
in the case of the ambient air-independent method, in the flue gas system, until the temperature falls below the dew point. Part
of the water vapour created on combustion of the gas thereby condenses. The condensation heat is fed to the heating, in contrast
to low-temperature boilers, thus making it possible to achieve over 100% efficiency.
The condensation in gas condensing technology has a pH value between 3.5 and 4. The condensation need not therefore, as a
rule, be neutralised before being guided into the public drainage system.
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