72 EN
cod. 3540000272 - Rev. 01 - 01/2024
Table 8- Typology
If the BLUEHELIX THETA C boiler is to be connected to a flue or a single chimney with natural
draught, the flue or chimney must be expressly designed by professionally qualified technical per-
sonnel in conformity with the current regulations and be suitable for sealed chamber units
equipped with fan.
Backflow preventer valve
The BLUEHELIX THETA C boiler can be connected to collective flues in positive pressure only
if running on G20 gas and equipped with the CLAPET VALVE KIT (ref. A - fig. 28) code
041106X0. The kit must be installed according to the instructions of fig. 28.
After installing the kit, set parameter P67 to 1 and proceed with the complete manual calibration
(see “Complete manual calibration” on page 76).
In case of C10-type boiler installation, apply the relevant white adhesive plate (included in
the document bag supplied with the unit) in a CLEARLY VISIBLE PLACE on the FRONT
PANEL.
After installation, check the tightness of the fumes and gas circuit.
OTHERWISE THERE IS DANGER OF SUFFOCATION DUE TO THE EMISSION OF COMBUS-
TION FUMES.
fig. 28- CLAPET VALVE kit
Type Description
C8X Exhaust in single or common flue and wall intake
B3X Intake from installation room by means of concentric duct (that encloses the exhaust) and exhaust in
common flue with natural draft
IMPORTANT- THE ROOM MUST BE PROVIDED WITH APPROPRIATE VENTILATION
C93 Exhaust to a vertical terminal and intake from existing flue.
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