Operating Principle; Gas/Air Setting - REMEHA Calenta 25s Installation And Service Manual

Calenta 25s - 28c - 35s - 40c
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3.3

Operating principle

040412 - 7600585-01
Calenta 35s - 40c
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3.3.1.
The casing fitted to the boiler is also used as an air box. Air is sucked
in by the fan and gas injected into the venturi by the fan intake. The
fan rotation speed is set according to the settings parameters, the
thermal energy requirement and the temperatures measured by the
temperature sensors. The gas and air are mixed in the venturi. The
gas/air ratio ensures that the quantities of gas and air are adjusted to
each other. This provides optimum combustion on the entire output
range. The gas/air mixture is fed into the burner on top of the
exchanger.
Flue gas outlet
Casing/air box
Outlet for measuring combustion gases
Mixer pipe
Heating flow hose
Air intake silencer
Box for the control PCBs (accessory)
Combined venturi and gas valve unit
Flow end hydroblock
Safety valve outlet pipe
Siphon
Instrument box
Shunt pump
Return end hydroblock
Plate heat exchanger (DHW) (Only on models with
domestic hot water production)
3-way valve (Only on models with domestic hot water
production)
Condensate receiver tank
Fan
Heat exchanger (Central heating)
Ignition/ionization electrode
Air intake

Gas/air setting

3. Technical description
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