Calenta 35s - 40c
1
Flue gas outlet
2
Casing/air box
3
Outlet for measuring combustion gases
4
Mixer pipe
5
Heating flow hose
6
Air intake silencer
7
Box for the control PCBs (accessory)
8
Combined venturi and gas valve unit
9
Flow end hydroblock
10
Safety valve outlet pipe
11
Siphon
12
Instrument box
13
Shunt pump
14
Return end hydroblock
15
Plate heat exchanger (DHW) (Only on models with
domestic hot water production)
16
3-way valve (Only on models with domestic hot water
production)
17
Condensate receiver tank
18
Fan
19
Heat exchanger (Central heating)
20
Ignition/ionization electrode
21
Air intake
3.3
Operating principle
3.3.1.
Gas/air setting
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.
T002886-C
2
14
16
15
13
17
18
19
20
3
4
5
6
7
8
9
10
11
12
1
21
Calenta 25s - 28c - 35s - 40c
3. Technical description
040412 - 7600585-01
13
